JP3050766B2 - Radar equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radar apparatus provided with SLB processing or SLC processing for preventing a clutter having a high reception strength inputted from a side lobe from being detected as an erroneous target. It is.

[0002]

2. Description of the Related Art FIG. 26 shows an SLB (Side Love).
Blanker) SL with antenna and SLB circuit
This is a conventional radar apparatus that performs a B process. This is similar to the invention described in JP-A-49-115791. In the figure, 1 is a main antenna, 2 is a main antenna switching circuit for switching the main antenna, 4 is a transmission / reception switching circuit for switching between transmission and reception, 5 is a transmitter, and 6a is a main antenna receiving circuit connected to the transmission / reception switching circuit. 6b is S
An SLB antenna receiving circuit connected to the LB antenna,
10 is an SLB circuit for performing SLB processing, 13 is a signal processor for performing target detection processing from the output of the SLB circuit, 14 is SL
This is an SLB antenna provided separately from the main antenna for B processing.

Next, the operation will be described. In FIG. 26, signals transmitted to and received from the main antenna (1 to N) 1 are switched by the main antenna switching circuit 2 by a main antenna switching signal input from the signal processor 13. In the transmission period, a transmission signal from the transmitter 5 passes through the transmission / reception switching circuit 4 and is provided to the main antenna connected to the transmission / reception switching circuit 4 by the main antenna switching circuit 2, and is radiated to space. During the reception period,
Only the received signal from the main antenna connected to the transmission / reception switching circuit 4 is input to the main antenna switching circuit 2, and is input to the main antenna receiving circuit 6 a via the transmission / reception switching circuit 4. In the main antenna receiving circuit 6a, the input signal is amplified by the amplifying circuit 7, and then the frequency conversion circuit 8 converts the signal from the RF band to the I signal.
SLB circuit 1 after frequency conversion to F band and detection by detection circuit 9
Output to 0. In the SLB circuit 10, the input signal is input to a blanking circuit 11 and an amplitude comparison circuit 12.
In the amplitude comparison circuit 12, the signal received by the SLB antenna 14 is input via the SLB antenna system receiving circuit 6b,
The amplitude of the received signal from the main antenna receiving circuit is compared. As a result, when the amplitude of the output signal of the SLB antenna system reception circuit is larger than the amplitude of the output signal of the main antenna system reception circuit, a blanking pulse is output. The blanking circuit 11 performs blanking on an input signal from the main antenna system receiving circuit 6 a based on a blanking pulse from the amplitude comparison circuit 12 and outputs the signal to the signal processor 13.
The signal processor performs target detection processing and outputs a main antenna switching signal to the main antenna switching circuit 2 for each data rate.

Here, the relationship between the main antenna and the SLB antenna will be described with reference to FIG. In the figure, the number of main antennas is four for easy understanding. FIG. 27 (a)
FIG. 3 is a diagram showing an antenna pattern on a horizontal plane. Each main antenna has directivity, and has an antenna pattern that maximizes the antenna gain in a certain direction. On the other hand, S
Since the LB antenna is omnidirectional, it has an antenna pattern that provides a constant antenna gain over almost the entire circumference. FIG.
FIG. 7B is a diagram in which the main lobe direction of a certain main antenna in the antenna pattern of FIG. 27A is represented by an azimuth angle of 0 °. In the figure, the range from -A ° to A ° is the main lobe of the main antenna, and the other range is the side lobe. In the side lobe, the antenna gain of the SLB antenna is larger than that of the main antenna. As described above, in the range where the intensity of the received wave from the SLB antenna is larger than the intensity of the main antenna, the signal is regarded as a signal from the side lobe direction, and the SLB circuit 10 blanks the range and removes the range as out of the range.

Next, the reason for blanking a signal from the side lobe direction of the main antenna will be described with reference to FIG. As shown in FIG. 27 (C), the signals incident from the side lobe direction of the main antenna are mainly reflected waves and interference waves from clutters such as the ground surface and the sea surface,
This signal is unnecessary in the target detection processing. These signals have a higher reception strength than the reception signal from the target, and if the signal processing is performed as it is, there is a possibility that the target may be an erroneous target. Therefore, in order to prevent the reflected signal from the clutter and the interference wave from being detected as erroneous targets, the side lobe direction (SL
SLB for blanking the received signal from antenna B)
It does the processing.

[0006]

Since the conventional radar device is configured as described above, it is necessary to use S for the SLB processing.
Since the LB antenna was required, there was a problem that the device scale became large.

[0007] with the present invention has been made to solve the above problems, performs the SLB process without providing a separate antenna for SLB processing the main antenna, interfere
A radar device that is hardly affected by harmful waves is obtained.

[0008]

A radar apparatus according to the present invention extracts a plurality of main antennas and a target signal obtained by switching the plurality of main antennas, and extracts a target signal other than the main antenna which obtains the target signal. A signal processor that provides a switching signal for the main antenna and a signal processor that obtains a target signal , and compares the strength of input signals from main antennas other than the main antenna ,
An SLB intensity comparison circuit for outputting a signal having a maximum amplitude ;
Side low using the signal output from the B intensity comparison circuit
And an SLB circuit for performing a block removal (SLB) process .

Further, the main antenna is a phased array antenna, and a beam control circuit for forming a beam shape into a fan beam is provided. When the main antenna is equivalent to an SLB antenna, the beam shape is controlled to be a fan beam.

Further, a side lobe canceller (SL)
C) circuit for inputting the SLB processing signal to the SLC circuit.
It is characterized by force.

[0011]

[0012]

[0013]

[0014]

[0015]

[0016]

[0017]

[0018]

According to the radar apparatus of the present invention, a target signal is obtained.
Signal strength from multiple main antennas other than the main antenna
The degrees are compared, and the one with the higher strength is selected in principle
And used as an SLB processing signal.

Further, the main antenna is a phased array antenna. When the main antenna is equivalent to an SLB antenna, the beam shape becomes a fan beam, and a signal from an antenna other than the main antenna obtaining a target signal is used as an SLB processing signal.

Still further, the intensities of signals from a plurality of main antennas other than the main antenna obtaining the target signal are compared,
In principle, the one with the higher strength is selected and
Used as a road processing signal .

[0021]

[0022]

[0023]

[0024]

[0025]

[0026]

[0027]

[0028]

【Example】

Embodiment 1 FIG. Hereinafter, a radar apparatus according to an embodiment of the present invention, in which an SLB dedicated antenna is omitted, will be described. FIG. 1 shows a radar apparatus according to an embodiment of the present invention, in which 1, 2 and 4 to 13 are the same as the conventional radar apparatus. However, besides the original target detection, the signal processing circuit 13 identifies the number of the main antenna corresponding to the target currently being received, and outputs the target receiving antenna and the numbers of the other antennas as antenna switching signals. Reference numeral 3 denotes a newly provided SLB antenna switching circuit.

In the embodiment of FIG. 1, only the operation different from the conventional one will be described. The main antennas 1 to N are connected to a main antenna switching circuit 2 and an SLB antenna switching circuit 3. The SLB antenna switching circuit 3 switches to the inactive one of the main antennas (1 to N) 1 according to the SLB antenna switching signal output from the signal processor 13 for each data rate. The switched antenna operates as an SLB antenna and the received signal is
The signal is input to the SLB antenna system receiving circuit 6b via the B antenna switching circuit 3.

According to this operation, there is no need to provide an SLB antenna different from the main antenna for SLB processing, and the apparatus can be downsized. Here, the antenna patterns of the main antenna and the SLB antenna during this operation will be described with reference to FIG. In the present embodiment, an example is shown in which an antenna whose direction is different from that of the antenna whose target is being detected by 180 degrees is selected as the SLB antenna. FIG. 2A is a diagram illustrating an antenna pattern on a horizontal plane. The main antenna and the SLB antenna have the same directivity. FIG.
FIG. 3A is a diagram expressing the antenna pattern of FIG. 3A assuming that a main lobe direction of a certain main antenna is an azimuth angle of 0 degree. 0 in the figure
A to B and 360 to 360 degrees are main lobes of the main antenna, and A to B degrees are side lobes. Meanwhile SL
The main lobe of the main antenna operating as the B antenna has a degree of A to B degrees, and the intensity of the signal received from this range is greater than the intensity of the signal received from the main antenna. Therefore, the SLB circuit 10
Then, the received signal from the main antenna is blanked.

Embodiment 2 FIG. In this embodiment, the main antenna (1
To N) are constituted by phased array antennas as shown in FIG. The antenna pattern of the antenna operating as the main antenna is a pencil beam, and the antenna pattern of the antenna operating as an SLB antenna is a fan beam. That is, FIG. 4A shows the horizontal antenna pattern, and FIG. 4B shows the antenna pattern when the center direction of the main antenna is set to 0 degree (360 degrees). Thus, the SLB process can be performed more effectively than in the first embodiment.

Hereinafter, portions different from the above embodiment will be described. In FIG. 3, the main antennas (1 to N) 1 are phased array antennas. The beam control circuit 16 outputs a signal for forming a pencil beam antenna pattern to the target detection main antenna connected by the main antenna switching circuit 2 according to the antenna switching signal from the signal processor. A signal for forming a fan beam antenna pattern is output to the main antenna connected by the SLB antenna switching circuit 3. Here, the main antenna switching circuit 2 and the SLB antenna switching circuit operate so as not to be connected to the same main antenna at the same time. The distributor 15 outputs the transmission output from the transmitter 5 to the main antenna (1 to 1).
N) Distribute to 1 element antenna. In the first embodiment, the antenna patterns of all the antennas are the same, but in the present embodiment, the antenna pattern of the antenna operating as the SLB antenna has a wider fan beam by the beam control circuit 16 as compared with the case of the first embodiment. By controlling the formation, the SLB processing can be performed in a wider range than in the first embodiment.

Embodiment 3 FIG. In this embodiment, an example will be described in which signals of a plurality of non-operating antennas are combined and used as SLB signals. In the above embodiment, since one of the main antennas not operating as the SLB antenna is used, there is a disadvantage that the effect of the SLB processing is weak in the side lobe direction of the antenna operating as the main antenna itself. In this embodiment, as shown in FIG. 5, the antenna patterns of all the remaining main antennas other than the operating main antenna are synthesized by the synthesizing circuit 17 to obtain the SLB antenna pattern. Thus, effective SLB processing can be performed even in the side lobe direction of the main antenna itself.

Hereinafter, portions different from the above embodiment will be described. In FIG. 5, the SLB antenna switching circuit 3 connects all the antennas not operating as the main antennas to the combining circuit 17 based on the SLB antenna switching signal from the signal processor 13. The combining circuit 17 combines the (N-1) antenna patterns not operating as the main antennas as shown in FIG. By forming the antenna pattern of the SLB antenna in this way, it is more effective in the following points as compared with the above embodiment. 1) In comparison with the conventional example: In the conventional example, the coverage of 360 ° is the coverage of the SLB antenna. However, due to the non-directionality, the received signal strength input from the SLB antenna is lower than that of the present embodiment. weak. In the present embodiment, since the pattern of the SLB antenna is formed by the main antennas (N-1) having directivity, the intensity of the received signal from the side lobe direction is high, so that the erroneous target removal can be more effectively performed than the conventional example. I can do it. 2) When compared with Example 1: In Example 1, S
For the received wave from the side lobe direction of the LB antenna,
There was a drawback that the effect was somewhat weak. In the present embodiment, since the pattern of the SLB antenna is formed by the main antennas (N-1) having directivity, the received signal strength from the side lobe direction is high. Can be done 3) When compared with the second embodiment: In the second embodiment, the effect of the SLB antenna on the reception wave from the side lobe direction is improved as compared with the first embodiment. Since the pattern of the SLB antenna is formed by (N-1) main antennas as in the present embodiment, the received signal strength from the side lobe direction is further stronger than that of the second embodiment, so that the erroneous target removal can be more effectively performed. I can do it.

Embodiment 4 FIG. In the present embodiment, a description will be given of an SBL operation for efficiently avoiding the influence of clutter and interference waves. In the above embodiment, there is only one SLB antenna system receiving circuit, but N SLB receiving system circuits are provided for each main antenna. Then, the amplitude of the received wave from each SLB receiving system circuit is compared, and the output of the SLB receiving system circuit 18 to which the received wave of the maximum amplitude is input is input to the amplitude comparing circuit 12 of the SLB circuit 10. With this configuration, the received signal from the azimuth of arrival of the interference wave can be blanked by the SLB circuit. FIG. 7 is a block diagram of the radar device of the present embodiment.

The operation of the third embodiment different from that of the first embodiment will be described below. In FIG. 7, a received signal input from a main antenna 1 is input to a main antenna switching circuit 2 and SLB antenna system receiving circuits 1 to N provided for each antenna. The output of the SLB antenna system receiving circuits 1 to N is S
LB reception system switching circuit 18 and SLB reception intensity comparison circuit 1
9 is input. In the SLB reception intensity comparison circuit 19, each S
The amplitudes of the received signals from the LB antenna system receiving circuits (1 to N) 6b to 6d are compared, and a signal that connects the SLB antenna system receiving circuit (1 to N) having the maximum amplitude to the SLB circuit 10 is converted to an SLB receiving system. Output to the switching circuit 18. The SLB reception system switching circuit 18 connects one of the SLB antenna system reception circuits (1 to N) to the SLB circuit 10 according to the output of the SLB reception intensity comparison circuit 19. FIG. 8 is an explanatory diagram of the antenna pattern of the present embodiment. In this way, by comparing the amplitude of the received signal and operating the antenna of the arrival direction of the received wave having the maximum amplitude as the SLB antenna, the main antenna and the SL are determined in a predetermined relationship as in the above embodiment.
Compared to the case where the B antenna is operated, the direction of arrival of the interference wave is selected and operated as the SLB antenna, and the antenna of the other direction is used as the main antenna.
This has the effect of making it less susceptible to interference waves.

Embodiment 5 FIG. In the fourth embodiment, the SLB antenna system receiving circuits 6b to 6b are provided for each of the main antennas (1 to N).
d is provided, but E is provided without providing an SLB antenna system receiving circuit.
A similar effect can be obtained by selecting an SLB antenna based on azimuth information from the SM device. FIG. 9 is a block diagram of the radar device of the present embodiment.

Hereinafter, parts different from the above embodiment will be described.
The operation will be described. In FIG. 9, the SLB antenna switching signal to the SLB antenna switching circuit 3 is
And input direction information based on the processing in the ESM device 21. That is, the SLB antenna switching circuit 3 connects the main antenna in the direction of arrival of the interfering wave received by the ESM device to the SLB antenna system receiving circuit 6. With this configuration, the SLB reception intensity comparison circuit 19 and the SLB reception system switching circuit 18 required in the fourth embodiment become unnecessary, and only one SLB antenna system reception circuit is prepared for each antenna. Therefore, the size of the apparatus can be reduced. The antenna patterns of the main antenna and the SLB antenna are the same as in the first embodiment.

Embodiment 6 FIG. Another SLB operation that effectively avoids the influence of clutter or interference will be described. In the fourth embodiment, the N SLB antenna system receiving circuits 6b to 6d are provided, and the antenna having the azimuth of the maximum receiving intensity is used as the SLB antenna. Here, the output of the SLB antenna system receiving circuit is stored in the maximum amplitude storage circuit, and the amplitude of the received signal from each antenna is compared, so that the antenna having the azimuth with the maximum reception strength operates as the SLB antenna. . That is, this is another application example of the fourth embodiment, and a similar effect can be obtained with a smaller circuit configuration. FIG. 10 is a block diagram of the radar device of the present embodiment.

Hereinafter, parts different from the fourth embodiment will be described.
The operation will be described. In FIG. 10, the SLB reception intensity comparison circuit 19 compares the output of the SLB antenna system reception circuit 6b with the amplitude of the output of the maximum amplitude storage circuit 22, and selects the main antenna in the azimuth in which the received wave having a large amplitude is input as the SLB antenna. I do. Then, an SLB antenna switching signal is output to the SLB antenna switching circuit 3 so as to be connected to the SLB antenna system receiving circuit 6b. The antenna patterns of the main antenna and the SLB antenna are the same as in the first embodiment.

Embodiment 7 FIG. The same effect can be obtained by applying the third embodiment to the second embodiment. The description of the operation is omitted because the antenna is only a phased array antenna in the third embodiment. A block diagram is shown in FIG.
The effect in this case is an effect obtained by combining the second embodiment and the third embodiment.

Embodiment 8 FIG. Example 4 or 5 in Example 2 above
Alternatively, the same effect can be obtained by applying the configuration 6.
In any case, the receiving signal input antenna having the maximum amplitude is selected as the SLB antenna in the second embodiment, and the antenna is merely a phased array antenna in the fourth, fifth, or sixth embodiment, and therefore the description of the operation is omitted. . FIG. 12 is a block diagram when the fourth embodiment is applied to the second embodiment. FIG. 13 is a block diagram when the fifth embodiment is adapted to the second embodiment. FIG. 14 is a block diagram when the sixth embodiment is applied to the second embodiment.

Embodiment 9 FIG. Although the example in which the SLB circuit is used in the first embodiment has been described, an example in which this SLB circuit is replaced with an SLC circuit will be described. The side lobe canceller is originally provided with a dedicated auxiliary antenna (SLC antenna) to actively remove interference waves. Here, a main antenna not used is used as an SLC antenna.

Hereinafter, parts different from the first embodiment will be described.
The operation will be described. In FIG. 15, the outputs of the main antenna system receiving circuit 6a and the SLB antenna system receiving circuit 6b are SLC
Input to the circuit 27. The SLC circuit 27 converts the output of the main antenna system receiving circuit 6a to the SLB antenna system receiving circuit 6a.
Subtract b output. The result is output to the signal processor 13.

Referring to FIG. 16, portions different from the antenna pattern of the first embodiment will be described. FIG. 16B shows S
Shows the antenna patterns of the main antenna and SLB antenna before and after LC processing (processing is dotted line, after processing is solid line)
When an SLC circuit is input, a received signal received in a pattern unique to each antenna is input as described above. As a result of subtracting the received signal input from the SLB antenna from the received signal input from the main antenna in the SLC circuit, the antenna pattern after the SLC processing has an antenna gain in a side lobe of the main antenna as shown by a solid line in FIG. Becomes a lowered antenna pattern. For this reason, the reception signal from the side lobe direction is lower than that at the time of input from the main antenna, and the intensity of clutter and interference waves is compressed, and the target detection performance is improved.

Embodiment 10 FIG. The SLB circuit 1 in the second embodiment.
An example in which 0 is replaced with the SLC circuit 27 will be described. FIG.
FIG. 1 shows a block diagram of the radar apparatus of the present embodiment. The operation when the SLB circuit 10 is replaced with the SLC circuit 27 is the same as that of the ninth embodiment, and the description is omitted.

Embodiment 11 FIG. In the third embodiment, the SLB circuit 1
An example in which 0 is replaced with the SLC circuit 27 will be described. FIG.
The block diagram of this embodiment is shown in FIG. Set the SLB circuit 10 to SL
The operation when replacing with the C circuit 27 is described in the ninth embodiment.
Therefore, the description is omitted.

Embodiment 12 FIG. In the fourth embodiment, the SLB circuit 1
An example in which 0 is replaced with the SLC circuit 27 will be described. FIG.
The block diagram of this embodiment is shown in FIG. Set the SLB circuit 10 to SL
The operation when replacing with the C circuit 27 is described in the ninth embodiment.
Therefore, the description is omitted.

Embodiment 13 FIG. The SLB circuit 1 in the fifth embodiment.
An example in which 0 is replaced with the SLC circuit 27 will be described. FIG.
The block diagram of this embodiment is shown in FIG. Set the SLB circuit 10 to SL
The operation when replacing with the C circuit 27 is described in the ninth embodiment.
Therefore, the description is omitted. This embodiment is another application example of the ninth embodiment and the fifth embodiment, and the effect is obtained by combining the respective embodiments.

Embodiment 14 FIG. In the sixth embodiment, the SLB circuit 1
An example in which 0 is replaced with the SLC circuit 27 will be described. FIG.
The block diagram of this embodiment is shown in FIG. Set the SLB circuit 10 to SL
The operation when replacing with the C circuit 27 is described in the ninth embodiment.
Therefore, the description is omitted. This embodiment is another application example of the ninth embodiment and the fourth embodiment, and the effect is obtained by combining the respective embodiments.

Embodiment 15 FIG. Example 11 is different from Example 10 described above.
The same effect can be obtained even if the configuration is applied. The description of the operation is omitted because the antenna is merely a phased array antenna in the eleventh embodiment. A block diagram is shown in FIG.

Embodiment 16 FIG. Example 12 is different from Example 10 above.
Alternatively, a similar effect can be obtained by applying the configuration of 13 or 14. In any case, the receiving signal input antenna having the maximum amplitude is selected as the SLB antenna in the tenth embodiment, and the description of the operation is omitted because the antenna is merely a phased array antenna in the twelfth, thirteenth, or fourteenth embodiment. I do. FIG. 23 is a block diagram when the twelfth embodiment is adapted to the tenth embodiment. Example 10 to Example 13
FIG. 24 is a block diagram showing a case where is adapted. Example 10
FIG. 25 is a block diagram when Embodiment 14 is applied to FIG.

[0053]

According As described above, according to the present invention to the present invention, multiple
SLB comparing the strength of input signals from a number of main antennas
Since it has an intensity comparison circuit, SLB is separate from the main antenna.
SL not easily affected by interfering waves without antenna
There is an effect that the B processing can be performed.

Furthermore, since the main antenna is a phased array antenna and has a beam control circuit, there is an effect that SLB processing can be performed over a wider range without providing an SLB antenna separately from the main antenna.

Further, input signals from a plurality of main antennas
SLB intensity comparison circuit for comparing signal intensity and SLC circuit
SLC antenna is installed separately from the main antenna.
SLC processing can be performed even if the
In addition, there is an effect that the target detection performance can be improved.

[0056]

[0057]

[0058]

[0059]

[0060]

[0061]

[0062]

[Brief description of the drawings]

FIG. 1 is a block diagram of a radar device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of an antenna pattern according to the first embodiment.

FIG. 3 is a block diagram of a radar device according to a second embodiment.

FIG. 4 is an explanatory diagram of an antenna pattern according to a second embodiment.

FIG. 5 is a block diagram of a radar apparatus according to a third embodiment.

FIG. 6 is an explanatory diagram of an antenna pattern according to a third embodiment.

FIG. 7 is a block diagram of a radar apparatus according to a fourth embodiment.

FIG. 8 is an explanatory diagram of an antenna pattern according to a fourth embodiment.

FIG. 9 is a block diagram of a radar apparatus according to a fifth embodiment.

FIG. 10 is a block diagram of a radar apparatus according to a sixth embodiment.

FIG. 11 is a block diagram of a radar apparatus according to a seventh embodiment.

FIG. 12 is a block diagram of a radar apparatus according to an eighth embodiment.

FIG. 13 is a block diagram of another radar apparatus according to the eighth embodiment.

FIG. 14 is a block diagram of another radar apparatus according to the eighth embodiment.

FIG. 15 is a block diagram illustrating a radar apparatus according to a ninth embodiment;

FIG. 16 is an explanatory diagram of an antenna pattern according to a ninth embodiment.

FIG. 17 is a block diagram illustrating a radar apparatus according to a tenth embodiment;

FIG. 18 is a block diagram of a radar apparatus according to an eleventh embodiment.

FIG. 19 is a block diagram of a radar apparatus according to a twelfth embodiment.

FIG. 20 is a block diagram illustrating a radar apparatus according to a thirteenth embodiment;

FIG. 21 is a block diagram illustrating a radar apparatus according to a fourteenth embodiment;

FIG. 22 is a block diagram illustrating a radar apparatus according to a fifteenth embodiment;

FIG. 23 is a block diagram of a radar apparatus according to a sixteenth embodiment.

FIG. 24 is a block diagram of another radar apparatus according to the sixteenth embodiment.

FIG. 25 is a block diagram of another radar device according to the sixteenth embodiment.

FIG. 26 is a block diagram of a conventional radar device.

FIG. 27 is an explanatory diagram of an antenna pattern of a conventional radar device.

[Explanation of symbols]

1 main antenna (1 to N), 2 main antenna switching circuit,
3 SLB antenna switching circuit, 4 transmission / reception switching circuit, 5
Transmitter, 6a Main antenna system receiving circuit, 6b-6d S
LB antenna system receiving circuit (1 to n), 7 amplifying circuit, 8
Frequency conversion circuit, 9 detection circuit, 10 SLB circuit,
11 blanking circuit, 12 amplitude comparison circuit, 13
Signal processor, 14 SLB dedicated antenna, 15 distributor, 16 beam controller, 17 combining circuit, 18 SLB
Reception system switching circuit, 19 SLB reception intensity comparison circuit, 20
ESM antenna, 21 ESM device, 22 maximum amplitude storage circuit, 23 main antenna signal processing circuit, 24 A
/ D conversion circuit, 25 target detection circuit, 26 antenna switching circuit, 27 SLC circuit.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-63-166305 (JP, A) JP-A-4-1584 (JP, A) JP-A-3-143104 (JP, A) JP-A-1- 162401 (JP, A) JP-A-62-263482 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01S ^7/ 00-7/42

Claims (3)

(57) [Claims] 1. A main antenna for extracting a plurality of main antennas and a target signal obtained by switching the plurality of main antennas, and obtaining the target signal.
A signal processor that provides a switching signal to a main antenna other than the main antenna compares the strength of an input signal from a main antenna other than the main antenna that obtains the target signal , and outputs a signal having a maximum amplitude.
And SLB intensity comparator circuit that, support by using the signal outputted from the SLB intensity comparator circuit
And an SLB circuit for performing idle lobe removal (SLB) processing.
Radar apparatus characterized by a. 2. The method according to claim 1, wherein the main antenna is a phased array antenna, a beam control circuit for forming a beam shape to a fan beam, and when the main antenna is equivalent to an SLB antenna, the beam shape is controlled to be a fan beam. The radar device according to claim 1. 3. A includes a sidelobe canceller (SLC) circuit, SL B processed signal radar apparatus according to claim 1, wherein the input to the SLC circuit.