JP5123036B2 - Radio wave receiving apparatus and radio wave receiving system - Google Patents

Description

  The present invention relates to a radio wave receiving apparatus and a radio wave receiving system, and more particularly to a radio wave receiving apparatus and a radio wave receiving system that measure an arrival direction while switching measurement characteristics based on polarization information of a received wave.

  FIG. 7 is a block diagram showing an example of a conventional radio wave receiver that measures the arrival direction of a received wave. This conventional radio wave receiver 9 measures, for example, the arrival directions of various radio waves received through a radome (not shown) by a method such as monopulse angle measurement, and displays the result. It comprises a receiving unit 92, a radio wave arrival direction measuring unit 93, and an operation display unit 94. The antenna unit 91 has, for example, beam patterns for measuring the arrival directions of sum beams, difference beams, and the like, and receives various radio waves arriving with the respective beam patterns through a radome (not shown). The receiving unit 92 performs reception processing such as low noise amplification, frequency conversion, filtering, and detection on each of the received signals in each beam pattern of the antenna unit 91. The radio wave arrival direction measuring unit 93 measures the arrival direction of the received wave by a technique such as monopulse angle measurement using the amplitude and / or phase of each signal subjected to the reception processing. The operation display unit 94 displays the measurement result.

  Next, the operation of the radio wave receiver of FIG. 7 will be described along the flow of signal processing for incoming waves. First, the incoming wave is received by the aerial part 91 having a beam pattern for measuring the direction of arrival through the radome, and sent to the receiving part 92 as a received signal for each beam pattern. The reception unit 92 is provided with a reception processing system corresponding to each beam pattern, and the reception signal from the antenna unit 91 is subjected to reception processing for each beam pattern and transmitted to the radio wave arrival direction measurement unit 93. . In the radio wave arrival direction measuring unit 93, the arrival direction is measured by a method such as monopulse angle measurement using the amplitude and phase of the reception signal for each beam pattern subjected to the reception processing, or one of these. Then, the result is sent to the operation display unit 94 and displayed.

An example of such a reception processing device that measures the direction of arrival of a received wave is disclosed in Patent Document 1, for example. In the case disclosed in this Patent Document 1, in addition to measuring the arrival direction of the linearly polarized radio wave radiated from the transmitting station, the polarization plane angle is measured, and the antenna is set based on these measurement results. A technique for directing is disclosed.
JP-A-6-130138 (page 17, FIG. 11)

  By the way, when measuring the arrival direction of the received wave, as described above, measurement processing using amplitude information and phase information of the received wave, such as monopulse angle measurement, is performed. Since the amplitude information and the phase information are easily affected by the polarization of the received wave, measurement characteristics corresponding to the polarization are required. In addition, particularly when a radome is used, since the radome exhibits different pass characteristics depending on the polarization of the received wave, the influence on the measurement characteristics is large.

  However, the conventional radio wave receiving apparatus as described above does not acquire the polarization information of the received wave, and when measuring the direction of arrival, for example, the measurement characteristics of a specific polarization and the average of various polarizations Measurement processing was performed using various measurement characteristics. For this reason, when using the measurement characteristics of a specific polarization, the measurement error increases when the polarization of the received wave does not match, and when using the average measurement characteristics of various polarizations However, it is an error factor when measuring the direction of arrival of the received wave. For example, the measurement error is included in any polarized wave although it is not extremely large.

  The present invention has been made in consideration of the above-described circumstances, and is a radio wave that measures the arrival direction of a received wave with good measurement accuracy by reducing the influence of polarization, which causes an error when measuring the arrival direction of the received wave. An object is to provide a receiving device and a radio wave receiving system.

To achieve the above object, the radio wave receiver of the present invention, while switching the measurement characteristics based on the polarization information of the received wave to a radio wave receiving apparatus for measuring the arrival direction, and the radome, the polarization through the radome Antenna unit for receiving different radio waves, a reception unit for receiving and receiving radio waves received by the antenna unit, and a radio wave specification detecting unit for acquiring radio wave parameters from the signals after reception processing by the reception unit And a polarization information database registered in advance by associating the radio wave specification of the received wave with the polarization information, and searching this polarization information database based on the radio wave specification acquired by the radio wave specification detection unit a plurality of angle measuring table having a polarization estimating section, an arrival direction measuring characteristics corresponding to the polarization of the received wave received by the antenna unit through said radome to estimate the polarization information of the radio waves by the polarization That a radio wave arrival direction measuring unit for measuring the direction of arrival of radio waves received by the antenna unit through the selected said radome any one of said plurality of angle measuring table based on the estimation result from tough Features.

In addition, the communication unit further includes a communication unit connected to a wired or wireless network, receives polarization information of the radio wave transmitted from the wired or wireless network, and receives the polarization information of the received radio wave and the polarization estimation unit. When the radio wave arrival direction measuring unit does not match, the radio wave arrival direction measurement unit calculates one of the plurality of angle measurement tables based on the polarization information of the radio wave from the wired or wireless network. In addition to the selection, the polarization estimation unit updates the polarization information database based on polarization information of the radio wave from the wired or wireless network.

In addition, a polarization measurement unit that measures the polarization of the radio wave is further provided, the polarization measurement result from the polarization measurement unit for the radio wave, the polarization information from the wired or wireless network, and the polarization estimation If the estimation result of the polarization information by the unit does not match, the radio wave arrival direction measurement unit adopts more reliable polarization information from among these, and based on the adopted polarization information of the radio wave, While selecting any one of the angle measurement tables, the polarization estimation unit updates the polarization information database based on the adopted polarization information of the radio wave.

The radio wave receiving system of the present invention includes a first radio wave receiving device that acquires polarization information of a received wave, and a second radio wave that measures the direction of arrival while switching measurement characteristics based on the polarization information of the received wave. A radio wave reception system in which a reception device is connected to each other by a wired or wireless network, the first radio wave reception device measuring a polarization information of a radio wave received by a first antenna unit; A communication unit that transmits the measurement result to the wired or wireless network, the second radio wave receiving device includes a radome, a second antenna unit that receives radio waves having different polarizations through the radome, A receiving unit that receives and processes radio waves received by the antenna unit, a radio wave specification detecting unit that acquires radio wave specifications of the radio waves from signals received by the receiving unit, Wave information and Polarization estimation having a polarization information database registered in advance and searching the polarization information database based on the radio wave parameters acquired by the radio wave parameter detection unit to estimate the polarization information of the radio wave Unit, a communication unit that receives the measurement result of the polarization information of the radio wave from the first radio wave receiver from the wired or wireless network, and the polarization of the received wave received by the second antenna unit through the radome A plurality of angle measurement tables having corresponding direction-of-arrival measurement characteristics, and a plurality of angle measurements based on an estimation result from the polarization estimation unit or a measurement result of the polarization information of the radio wave by the first radio wave receiver. characterized in that a radio wave arrival direction measuring unit for measuring the direction of arrival of radio waves received by the second antenna portion through selected said radome any one of tables

  Advantageous Effects of Invention According to the present invention, a radio wave receiver and radio wave that can reduce the influence of polarization, which is an error factor when measuring the direction of arrival of a received wave, can measure the direction of arrival of a received wave with good measurement accuracy by reducing measurement errors A receiving system can be obtained.

  The best mode for carrying out the radio wave receiving apparatus and radio wave receiving system according to the present invention will be described below with reference to FIGS.

  FIG. 1 is a block diagram showing a configuration of a first embodiment of a radio wave receiving apparatus according to the present invention. The radio wave receiver 1 illustrated in FIG. 1 includes an antenna unit 11, a receiving unit 12, a radio wave specification detection unit 13, a polarization estimation unit 14, a plurality of angle measurement tables 15, a radio wave arrival direction measurement unit 16, and an operation display. The unit 17 is configured. The antenna unit 11 is configured to be compatible with a plurality of types of polarized waves, receives incoming waves, and sends them to the receiving unit 12. In the radio wave arrival direction measuring unit 16 described later, for example, when the radio wave arrival direction is measured by a monopulse angle measuring method, the antenna unit 11 forms a beam pattern of the sum and difference in a predetermined direction corresponding to this. The reception signals in the respective beam patterns are transmitted to the reception unit 12. It is also possible to receive the incoming wave through a radome (not shown).

  The receiving unit 12 performs reception processing such as low noise amplification, frequency conversion, filtering, and detection on the radio wave received by the antenna unit 11. When a reception signal is transmitted from the antenna unit 11 for each of a plurality of beam patterns, for example, a plurality of reception channels are provided, and each reception process is performed. The radio wave specification detection unit 13 acquires the radio wave specification from the signal after reception processing by the reception unit 12 and sends it to the polarization estimation unit 14. For example, if the received wave is a pulse wave such as a radar signal, the radio wave specifications to be acquired are its signal frequency (RF), pulse repetition interval (PRI), pulse duration (PD), etc., and continuous wave If so, the signal frequency (RF), modulation format (Mod), occupied bandwidth (BW), and the like. In obtaining these radio wave specifications, various pulse analysis techniques can be applied to pulse waves, and various modulation format analysis techniques can be applied to continuous waves.

  The polarization estimation unit 14 has a preset polarization information database 141 therein, and searches the polarization information database 141 based on the radio wave specifications of the received wave acquired by the radio wave specification detection unit 13. Then, the polarization of the received wave is estimated, and the result is sent to the radio wave arrival direction measuring unit 16. The polarization information database 141 is a database of signal lists registered by associating radio wave specifications with polarization information of incoming waves having the radio wave specifications. Using the specifications as search keys, the corresponding polarization information is extracted. In addition, about the value of each radio wave specification, it can also express and register in the range by a lower limit and an upper limit.

  The angle measurement table 15 is composed of a plurality of angle measurement tables having measurement characteristics corresponding to the polarization information of the incoming wave. During the measurement process of the incoming direction of the received wave in the radio wave arrival direction measuring unit 16 described later. The angle measurement table corresponding to the polarization information is selected and referred to. For example, in the monopulse angle measurement method, an S-shaped curve representing the relationship between the error voltage and the error angle corresponds to this angle measurement table. In addition, the values of these angle measurement tables are set based on, for example, measurement characteristics acquired by performing actual measurement using a known test signal in advance for each corresponding polarization. The radio wave arrival direction measurement unit 16 receives the estimation result of the polarization information of the received wave from the polarization estimation unit 14, selects a corresponding angle measurement table from the plurality of angle measurement tables 15, and selects the selected measurement Using the angle table 15, the direction of arrival measurement processing is performed on the signal after reception processing from the reception unit 12, and the direction of arrival is acquired. As the direction-of-arrival measurement process, for example, a monopulse angle measurement method or the like can be applied. The operation display unit 17 displays the acquired arrival direction, accepts various operations including setting operations of the polarization information database 141 and the plurality of angle measurement tables 15, and transfers them to each unit of the apparatus.

  Next, the operation of the radio wave receiving apparatus of the present embodiment configured as described above will be described with reference to the flowcharts of FIG. 1 and FIG. FIG. 2 is a flowchart for explaining the operation of the radio wave receiver 1 according to the present invention illustrated in FIG.

  First, a plurality of angle measurement tables 15 and a polarization information database 141 are set as advance preparations. The plurality of angle measurement tables 15 are set based on, for example, measurement characteristics acquired by performing actual measurement or the like for each corresponding polarization. The polarization information database is set based on, for example, known signal information. These setting operations are performed, for example, through the operation display unit 17 by an operator or the like (ST201). Next, when an incoming wave is received by the antenna unit 11 through a radome or the like, a received signal is sent to the receiving unit 12 for each beam pattern (ST202). In the reception unit 12, reception processing is performed on each reception channel provided corresponding to each beam pattern, and is transmitted to the radio wave specification detection unit 13. For example, if the received wave is a pulse signal, the radio wave element detection unit 13 applies various pulse signal analysis techniques to the signal frequency (RF) and the pulse repetition interval (PRI). ), And acquisition of radio wave specifications such as pulse duration (PD). Then, the result is notified to the polarization estimation unit 14. In addition, the signal after receiving processing by the receiving unit 12 is also sent to the radio wave arrival direction measuring unit 16 (ST203).

  When the radio wave specification of the received wave is notified from the radio wave specification detection unit 13, the polarization estimation unit 14 searches the polarization information database 141 using these radio wave specifications as a search key, and a signal matching the radio wave specification is obtained. Polarization information related to is extracted. In addition to the case where all radio wave specifications set in the search key are collated and matched as conditions for judging the match of radio wave specifications, for example, specific specifications in a plurality of specifications or a combination thereof It can be set in various ways, for example, in the case of matching. Then, the extracted polarization information is sent to the radio wave arrival direction measuring unit 16 as the estimation result of the polarization of the received wave (ST204).

  First, the radio wave arrival direction measurement unit 16 selects an angle measurement table corresponding to the estimation result from the polarization estimation unit 14 from a plurality of angle measurement tables 15 provided corresponding to the polarization of the received wave. . Thereby, in measuring the arrival direction of the received wave, the measurement characteristic corresponding to the polarization of the received wave is applied (ST205). Then, the arrival direction of the received wave is acquired by performing measurement processing such as a monopulse angle measurement method on the signal after reception processing from the reception unit 12 using the selected table. The acquired arrival direction is sent to the operation display unit 17 and displayed (ST206).

  Thereafter, the above-described steps ST201 to ST206 are repeated until the end of the operation is instructed. However, when a change or the like occurs in the polarization information database 141 registered and set in advance while the operation is continued. (Y in ST207), for example, when an operator or the like performs a predetermined operation through the operation display unit 17, the content is updated (ST208 and ST209).

  As described above, in this embodiment, a plurality of angle measurement tables for measuring the direction of arrival having measurement characteristics corresponding to the polarization are set in advance, and first, radio wave specifications of the received wave are acquired. Then, using this as a search key, a polarization information database in which radio wave specifications and polarization information are associated is searched, and the polarization information is estimated. Then, the angle measurement table corresponding to the estimation result is selected from the plurality of angle measurement tables, and the arrival direction of the received wave is measured by applying the selected angle measurement table.

  As a result, when measuring the arrival direction of the received wave, the measurement characteristics corresponding to the polarization of the received wave are applied. Thus, it is possible to obtain a radio wave receiver capable of measuring the arrival direction of a received wave with good measurement accuracy.

  FIG. 3 is a block diagram showing the configuration of the second embodiment of the radio wave receiving apparatus according to the present invention. FIG. 4 is a flowchart for explaining the operation. In the second embodiment, the same parts as those in the first embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals, and the description thereof is omitted. The second embodiment is different from the first embodiment in the following two points. That is, the first point is that when estimating the polarization information of the received wave, in the first embodiment, the polarization information database 141 is searched using the acquired radio wave specifications of the received wave as a search key. Although the information was estimated, in the second embodiment, in addition to the configuration of the first embodiment, a polarization measuring unit that measures the polarization of the received wave is provided and the polarization information is measured. If the measured result does not match the estimated result, the measured result is adopted as the estimated result, and the polarization information database is updated using the measured result. is there.

  The second point is selected based on the estimation result of the polarization information in the first embodiment when the angle measurement table corresponding to the polarization information of the received wave is selected from the plurality of angle measurement tables. In contrast, in the second embodiment, in addition to the configuration described above, a communication unit connected to a wireless network is provided so that polarization information from the outside can be received via this network, If the polarization information estimation result including the measurement result described in the first point and the polarization information from the outside do not match, the selection is made based on the polarization information from the outside. The polarization information database is updated using polarization information from the outside. Only the differences will be described below with reference to FIGS. 1 and 2 and FIGS.

  As illustrated in FIG. 3, the radio wave receiving device 3 includes an antenna unit 11, a receiving unit 12, a radio wave specification detecting unit 13, a polarization estimating unit 33, an angle measuring table 15, a radio wave arrival direction measuring unit 34, and an operation. In addition to the display unit 17, a polarization measuring unit 31 and a communication unit 32 are provided. The polarization measuring unit 31 measures the polarization information of the received wave and sends the result to the polarization estimating unit 33. The polarization measuring unit 31 can be configured by applying, for example, the technique disclosed in Patent Document 1. The communication unit 32 is an interface part that connects the present apparatus and a wireless network (not shown), and exchanges various data including polarization information from the outside with respect to a received wave transmitted via the wireless network, These are sent to a polarization estimation unit 33 and a radio wave arrival direction measurement unit 34 described later.

  The polarization estimator 33 estimates the polarization information of the received wave by the same method as the polarization estimator 14 in the first embodiment, and measures the result of measuring the polarization of the received wave from the polarization measuring unit 31. The received result is collated with the estimation result. If they do not match, the result measured by the polarization measuring unit 31 is adopted as the estimation result. At the same time, the corresponding content of the polarization information database 141 is updated using the result measured by the polarization measurement unit 31 and the polarization information from the outside sent from the communication unit 32. The radio wave arrival direction measurement unit 34 applies the measurement based on the result of collating the estimation result from the polarization estimation unit 33 with respect to the polarization information of the received wave and the external polarization information received through the communication unit 32. The angle table is selected from the plurality of angle measurement tables 15 and received from the reception unit 12 using the selected angle measurement table 15 by the same method as the radio wave arrival direction measurement unit 16 in the first embodiment. The direction-of-arrival measurement process for the subsequent signal is executed to obtain the direction of arrival of the received wave.

  Next, the operation of the radio wave receiver 3 of this embodiment will be described with reference to the flowchart of FIG. First, a plurality of angle measurement tables 15 and a polarization information database 141 are set. When an incoming wave is received, the radio wave specifications are acquired, and the polarization information database 141 is searched based on the acquisition result. Thus, the polarization information of the received wave is estimated (ST201 to ST204). In parallel with this, the polarization measuring unit 31 measures the polarization information of the received wave, and the result is sent to the polarization estimating unit 33 (ST401).

  The polarization estimation unit 33 collates the result measured by the polarization measurement unit 31 with its own estimation result, and when both match, the polarization information of the received wave is The estimation result is sent as it is to the radio wave arrival direction measuring unit 34 (Y in ST402). On the other hand, if they do not match (N in ST402), the result measured by the polarization measuring unit 31 is adopted as the estimation result and sent to the radio wave arrival direction measuring unit 34 and measured by the polarization measuring unit 31. Using the result, the polarization information of the corresponding record in the polarization information database 141 is updated (ST403 and ST404).

  Separately from this, the polarization information for the received wave acquired externally is appropriately transmitted from the wireless network to the communication unit 32, and this polarization information from the outside is transmitted from the communication unit 32 to the radio wave arrival direction measuring unit. 34. In the radio wave arrival direction measurement unit 34, the polarization of the received wave from the plurality of angle measurement tables 15 based on the estimation result from the polarization estimation unit 33 and the external polarization information received through the communication unit 32. The angle measurement table corresponding to the information is selected as follows. That is, when there is no polarization information from the outside with respect to the received wave (N in ST405), there is polarization information from the outside (Y in ST405), and this is collated with the estimation result from the polarization estimation unit 33. If they agree with each other (Y in ST406), the corresponding angle measurement table is selected based on the estimation result from the polarization estimation unit 33 (ST409).

  On the other hand, if there is polarization information from the outside but this does not match the estimation result from the polarization estimator 33 (N in ST406), this is handled based on the polarization information from the outside. An angle measurement table is selected (ST407). In addition, in this case, the polarization information of the corresponding record in the polarization information database 141 is updated using the polarization information from the outside (ST408). As a result, the measurement characteristics corresponding to the polarization of the received wave are applied in measuring the arrival direction of the received wave. After the angle measurement table is selected, the radio wave arrival direction measuring unit 34 uses the first embodiment. The arrival direction of the received wave is acquired by the same method as the radio wave arrival direction measuring unit 16 in FIG. 5, and the result is sent to the operation display unit 17 and displayed (ST206).

  Thereafter, the above-described steps ST201 to ST206 are repeated until the end of the operation is instructed. However, when a change or the like occurs in the polarization information database 141 registered and set in advance while the operation is continued. (Y in ST207), for example, when an operator or the like performs a predetermined operation through the operation display unit 17, the content is updated (ST208 and ST209).

  As described above, also in this embodiment, a plurality of angle measurement tables for measuring the direction of arrival having measurement characteristics corresponding to polarization are set in advance, and first, radio wave specifications of the received wave are acquired. Then, using this as a search key, a polarization information database in which radio wave specifications and polarization information are associated is searched, and the polarization information is estimated. In addition, the polarization of the received wave is measured and the polarization information of the received wave is received from the outside through the wireless network. Then, the estimated results and these are compared and collated with each other, and based on the results, more reliable received wave polarization information is adopted from these, and from a plurality of preset angle measurement tables. The direction of arrival of the received wave is measured by selecting and applying the angle measurement table corresponding to the polarization information that is more reliable. In addition, the polarization information database is also updated, and the estimation results of the subsequent polarization information are made more reliable.

  As a result, when measuring the arrival direction of the received wave, the measurement characteristics corresponding to the polarization of the received wave are applied. Thus, it is possible to obtain a radio wave receiver capable of measuring the arrival direction of a received wave with good measurement accuracy.

  FIG. 5 is a block diagram showing a configuration of an embodiment of the radio wave receiving system according to the present invention. FIG. 6 is a flowchart for explaining the operation. In these drawings, the same parts as those of the first and second embodiments of the radio wave receiving apparatus according to the present invention shown in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The radio wave receiving system illustrated in FIG. 5 includes a polarization measuring device 5 as a first radio wave receiving device, a radio wave receiving device 6 as a second radio wave receiving device, and a wireless network 7 connecting them. Yes. The polarization measuring device 5 acquires the polarization wave information of the received wave by measuring it, and sends the result to the wireless network 7. The radio wave receiver 6 measures the arrival direction while switching the measurement characteristics based on the polarization information of the received wave. The wireless network 7 exchanges various information including polarization information of received waves between devices connected to the network.

  Here, the polarization measuring device 5 includes an antenna unit 51 as a measurement receiving unit, a receiving unit 52, a polarization measuring unit 53, and a communication unit 54. The antenna unit 51 has a plurality of antennas having different polarization characteristics, for example, and receives incoming waves. The receiving unit 52 performs reception processing such as amplification, frequency conversion, and detection on the received waves from the respective antennas. The polarization measuring unit 53 measures the polarization information of the received wave from the amplitude of the signal subjected to the reception processing, for example. The communication unit 54 is an interface part that connects the present apparatus and the wireless network 7, and exchanges various data including the measured polarization information of received waves with the wireless network 7.

  The radio wave receiver 6 includes an antenna unit 11, a reception unit 12, a radio wave specification detection unit 13, a polarization estimation unit 61, an angle measurement table 15, a radio wave arrival direction measurement unit 34, an operation display unit 17, and a communication unit 32. It has. The configuration other than the polarization estimator 61 is the same as the components of the first and second embodiments of the radio wave receiving apparatus according to the present invention shown in FIG. 1 and FIG. The polarization estimation unit 61 has a polarization information database 141 therein, and uses the same technique as the polarization estimation unit 14 in the first embodiment or the polarization estimation unit 33 in the second embodiment. While estimating the polarization information of the received wave, the polarization information database 141 uses various information from the outside including the polarization information of the received wave from the polarization measuring device 5 sent from the communication unit 32. Update applicable content.

  Next, the operation of the radio wave reception system of the present embodiment configured as described above will be described with reference to the flowcharts of FIGS. 1 to 5 and FIG. In the following description, the operation of the entire radio wave receiving system will be described focusing on the operation on the radio wave receiving device 6 side.

  First, a plurality of angle measurement tables 15 and a polarization information database are set in the radio wave receiver 6. When an incoming wave is received, its radio wave specifications are acquired, and the polarization estimation unit 61 estimates the polarization information of the received wave by searching the polarization information database 141 based on the acquisition result. The estimation result is sent to the radio wave arrival direction measuring unit 34 (ST201 to ST204). In parallel with this, the incoming wave is also received by the antenna unit 51 of the polarization measuring device 5, subjected to reception processing by the receiving unit 52, and then polarization information is measured by the polarization measuring unit 53. The result is transmitted from the communication unit 54 to the wireless network 7 with the destination being the radio wave receiver 6 (ST601).

  On the radio wave receiving device 6 side, when the measurement results for the polarization of the received wave are sent from the polarization measuring device 5 via the wireless network 7, these are received by the communication unit 32 and transferred to the radio wave arrival direction measuring unit 34. Is done. Subsequently, the radio wave arrival direction measurement unit 34 is based on the estimation result of the polarization information from the polarization estimation unit 33 in step ST204 and the measurement result from the polarization measurement device 5 received through the communication unit 32. The angle measurement table corresponding to the polarization information of the received wave is selected from the plurality of angle measurement tables 15 as follows. That is, when there is no measurement result from the polarization measuring device 5 due to measurement inability or the like (N in ST602), there is a measurement result from the polarization measuring device 5 (Y in ST602), and this is the polarization estimation unit 33. When matching with the estimation result from (Y in ST603), the corresponding angle measurement table is selected based on the estimation result from the polarization estimation unit 33 (ST409). On the other hand, if there is a measurement result from the polarization measurement device 5 but this does not match the estimation result from the polarization estimation unit 33 (N in ST603), the measurement from the polarization measurement device 5 is performed. A corresponding angle measurement table is selected based on the result (ST604). In addition, in this case, the polarization information of the corresponding record in the polarization information database 141 is updated using the measurement result from the polarization measuring device 5. Accordingly, measurement characteristics corresponding to the polarization of the received wave are applied when measuring the direction of arrival of the received wave (ST605). Thereafter, the radio wave arrival direction measurement unit 34 obtains the arrival direction of the received wave using the selected angle measurement table 15, and the result is sent to the operation display unit 17 and displayed (ST206).

  Thereafter, the above-described steps ST201 to ST206 are repeated until an operation end is instructed, but updating the polarization information database 141 in the radio wave receiver 6 via the wireless network 7 while continuing the operation. When the information is sent, the update information is transferred from the communication unit 32 to the polarization estimation unit 61, and the content is updated. The contents can also be updated by performing a predetermined operation from the operation display unit 17 (ST207 to ST209).

  As described above, in the radio wave receiving system of the present embodiment, on the radio wave receiving device side, a plurality of angle measurement tables for measuring the direction of arrival having measurement characteristics corresponding to the polarization are set in advance. First, the radio wave specification is acquired for the received wave, and this is used as a search key to search the polarization information database in which the radio wave specification and polarization information are associated, and to estimate the polarization information. . In addition, the polarization measuring device measures the polarization of the received wave and sends the measurement result to the radio wave receiving device through the wireless network. Then, on the radio wave receiving device side, the polarization information estimation result and the measurement result are compared and collated with each other. Based on the result, more reliable received wave polarization information is adopted, and a plurality of preset information are set. The angle measurement table corresponding to the polarization information that is more reliable is selected and applied from the angle measurement table, and the arrival direction of the received wave is measured. In addition, the polarization information database is updated, and it can be updated in real time via a wireless network, thereby making the content more reliable.

  As a result, when measuring the arrival direction of the received wave, the measurement characteristics corresponding to the polarization of the received wave are applied. Thus, it is possible to obtain a radio wave reception system that can measure the arrival direction of a received wave with good measurement accuracy.

  In addition, since the polarization measuring device and the radio wave receiving device are connected by a wireless network, it is possible to realize a radio wave receiving system having mobility such as mounting these devices on a moving body.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

The block diagram which shows the structure of the 1st Example of the electromagnetic wave receiver which concerns on this invention. 3 is a flowchart for explaining the operation of the radio wave receiver illustrated in FIG. 1. The block diagram which shows the structure of the 2nd Example of the electromagnetic wave receiver which concerns on this invention. 4 is a flowchart for explaining the operation of the radio wave receiver illustrated in FIG. 3. The block diagram which shows the structure of one Example of the electromagnetic wave reception system which concerns on this invention. 6 is a flowchart for explaining the operation of the radio wave receiving system illustrated in FIG. The block diagram which shows an example of the conventional electromagnetic wave receiver.

Explanation of symbols

1, 3, 6 Radio wave reception device 5 Polarization measurement device 7 Wireless network 11, 51 Antenna unit 12, 52 Reception unit 13 Radio wave specification detection unit 14, 33, 61 Polarization estimation unit 15 Angle measurement table 16, 34 Radio wave arrival Direction measurement unit 17 Operation display unit 31, 53 Polarization measurement unit 32, 54 Communication unit 141 Polarization information database

Claims (6)

A radio wave receiver that measures the direction of arrival while switching measurement characteristics based on polarization information of a received wave,
Radome,
An antenna that receives radio waves with different polarizations through this radome ,
A receiving unit that receives and processes radio waves received by the antenna unit;
A radio wave specification detection unit that acquires radio wave specifications of the radio wave from a signal after reception processing in the reception unit;
It has a polarization information database registered in advance by associating radio wave specifications of received waves with polarization information, and searches this polarization information database based on the radio wave specifications acquired by the radio wave specification detector. A polarization estimator for estimating polarization information of the radio wave;
A plurality of angle measurement tables having direction-of-arrival measurement characteristics corresponding to the polarization of the received wave received at the antenna portion through the radome ;
A radio wave arrival direction measuring unit that selects any one of the plurality of angle measurement tables based on an estimation result from the polarization estimation unit and measures an arrival direction of the radio wave received by the antenna unit through the radome. A radio wave receiver characterized by that.   In addition, it has a communication unit that connects to a wired or wireless network,
  While receiving the polarization information of the radio wave sent from this wired or wireless network,
  When the received polarization information of the radio wave and the estimation result by the polarization estimation unit are collated and both do not match,
  The radio wave arrival direction measuring unit selects any one of the plurality of angle measurement tables based on the polarization information of the radio wave from the wired or wireless network, and the polarization estimating unit is connected to the wired or wireless network. The polarization information database is updated based on the polarization information of the radio wave from
The radio wave receiver according to claim 1.   Furthermore, a polarization measuring unit for measuring the polarization of the radio wave is provided,
  When the polarization measurement result from the polarization measurement unit for the radio wave, the polarization information from the wired or wireless network, and the polarization information estimation result by the polarization estimation unit do not match,
  The radio wave arrival direction measurement unit adopts more reliable polarization information from these, and selects any one of the plurality of angle measurement tables based on the adopted polarization information of the radio wave,
  The polarization estimation unit updates the polarization information database based on the adopted polarization information of the radio wave.
The radio wave receiver according to claim 2. A first radio wave receiver that acquires polarization information of a received wave and a second radio wave receiver that measures the direction of arrival while switching measurement characteristics based on the polarization information of the received wave are mutually connected by a wired or wireless network. A radio wave receiving system connected to
The first radio wave receiver includes a measurement receiver that measures polarization information of radio waves received by the first antenna unit,
A communication unit for sending the measurement result to the wired or wireless network,
The second radio wave receiver is
Radome,
A second antenna that receives radio waves having different polarizations through the radome ;
A receiving unit that receives and processes radio waves received by the second antenna unit;
A radio wave specification detection unit that acquires radio wave specifications of the radio wave from a signal after reception processing in the reception unit;
It has a polarization information database registered in advance by associating radio wave specifications of received waves with polarization information, and searches this polarization information database based on the radio wave specifications acquired by the radio wave specification detector. A polarization estimator for estimating polarization information of the radio wave;
A communication unit for receiving a measurement result of the polarization information of the radio wave by the first radio wave receiver from the wired or wireless network;
A plurality of angle measuring tables having direction-of-arrival measurement characteristics corresponding to the polarization of the received wave received by the second antenna portion through the radome ;
Based on the estimation result from the polarization estimation unit or the measurement result of the polarization information of the radio wave by the first radio wave receiving device, one of the plurality of angle measurement tables is selected and the second through the radome. A radio wave receiving system comprising: a radio wave arrival direction measuring unit that measures a direction of arrival of a radio wave received by an aerial part . When the radio wave arrival direction measuring unit of the second radio wave receiving device selects any one of the plurality of angle measurement tables,
For the radio wave that has not received the polarization information measurement result by the first radio wave receiving device from the wired or wireless network, select based on the estimation result from the polarization estimation unit,
For the radio wave received the measurement result of the polarization information by the first radio wave receiving device from the wired or wireless network, check this with the estimation result by the polarization estimation unit,
If there is a match, select one of these,
If they do not match, the selection is made based on the measurement result of the polarization information of the radio wave by the first radio wave receiver, and the polarization estimation unit is based on the polarization information of the radio wave from the wired or wireless network. The radio wave receiving system according to claim 4, wherein the polarization information database is updated.   6. The radio wave receiving system according to claim 4, wherein the polarization information database of the second radio wave receiving device can be updated from the wired or wireless network.

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