JP6435040B2 - Radar system - Google Patents

Description

  The present invention relates to a radar system that calculates a wind direction and a wind speed and displays the calculated wind direction and wind speed on a display.

  Conventionally, for example, a display method as disclosed in Non-Patent Document 1 is known as a method for displaying information on wind direction and wind speed at each point in a predetermined area. In the image disclosed in Non-Patent Document 1, an arrow is displayed at each point in the Kinki region. The direction of the arrow indicates the direction of the wind (wind direction), and the color of each arrow corresponds to the speed of the wind (wind speed). Thereby, the user can know the wind direction and the wind speed at each point in the Kinki region.

Japan Meteorological Agency, “Amedas: Kinki”, [online], [Search February 16, 2015], Internet, <http://www.jma.go.jp/jp/amedas/211.html?elementCode=1>

  By the way, no matter what method is used to calculate the wind direction and the wind speed, the number of samples and errors used for calculating the wind direction and the wind speed in each method greatly affect the reliability of the data. Therefore, it is very important to know the reliability of the data. However, according to the display screen of Non-Patent Document 1 described above, although the wind direction and wind speed at each point on the map can be known, the degree of accuracy of the wind direction and wind speed displayed at each point (hereinafter, this In the specification, this degree of accuracy may be referred to as reliability).

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a radar system capable of displaying the reliability of information on the wind direction and wind speed displayed on the display unit on the display unit.

  (1) In order to solve the above problem, a radar system according to an aspect of the present invention is based on a received signal generated from a reflected wave of a transmission wave transmitted from a transmission unit, and a wind speed vector at each point and A radar system comprising a wind speed vector calculation unit for calculating a wind speed vector distribution which is the distribution, and a display for displaying the wind speed vector distribution, wherein the display also has reliability of the wind speed vector. Is displayed.

  (2) Preferably, the radar system includes at least two radar devices each having the transmission unit, and the transmission units are arranged at different positions, and the wind speed vector calculation unit includes: The wind speed vector is calculated based on a reception signal generated from the reflected wave received by the radar device.

  (3) More preferably, the radar system is a wind speed vector reliability distribution which is a distribution of the reliability of the wind speed vector at each point, which is determined based on a position where the at least two radar devices are arranged. Is further provided.

  (4) More preferably, the wind speed vector reliability distribution is superimposed on the wind speed vector distribution and displayed on the display.

  (5) Preferably, the radar system calculates the wind speed vector using a dual Doppler method.

  (6) Preferably, the radar system includes at least three radar devices each having the transmission unit, and the transmission units are arranged at different positions, and the wind speed is measured using a triple Doppler method. Calculate the vector.

  (7) Preferably, the radar system includes one radar device having the transmission unit, and the wind speed vector calculation unit is a reception generated from a reflected wave of a transmission wave transmitted from the transmission unit. Based on the signal, the wind speed vector at each point is calculated.

  (8) More preferably, the radar system further includes a reliability calculation unit that calculates the reliability for each wind speed vector at each point, and the display unit includes the reliability corresponding to the wind speed vector. The reliability is displayed.

  (9) More preferably, the wind speed vector calculation unit calculates the wind speed vector using a simplified VVP method.

  ADVANTAGE OF THE INVENTION According to this invention, the radar system which can calculate the reliability of the information regarding the wind direction and wind speed which are displayed on a display can be provided.

1 is a block diagram of a weather radar system according to an embodiment of the present invention. It is a figure which shows an example of the position where two radar apparatuses shown in FIG. 1 are arrange | positioned. It is a schematic diagram which shows the wind direction and wind speed which are calculated by each signal processing part shown in FIG. It is a figure which shows the wind speed vector distribution calculated by the wind speed vector calculation part shown in FIG. It is a figure which shows an example of the error rate distribution memorize | stored in the error rate distribution memory | storage part shown in FIG. It is an image produced | generated by the display image production | generation part, Comprising: It is a figure which shows the display image displayed on a display. It is a figure which expands and shows a part of display image displayed on the indicator of the weather radar system which concerns on a modification. It is a block diagram of the weather radar system which concerns on a modification. It is a figure which expands and shows a part of display screen displayed on the indicator of the weather radar system which concerns on a modification. It is a figure which expands and shows a part of display screen displayed on the indicator of the weather radar system which concerns on a modification. It is a figure which expands and shows a part of display screen displayed on the indicator of the weather radar system which concerns on a modification. It is a figure which expands and shows a part of display screen displayed on the indicator of the weather radar system which concerns on a modification. It is a block diagram of the weather radar system which concerns on a modification.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The present invention can be widely applied as a weather radar system that calculates a wind direction and a wind speed and displays the calculated wind direction and wind speed on a display.

  FIG. 1 is a block diagram of a weather radar system 1 (hereinafter simply referred to as a radar system 1) according to an embodiment of the present invention. FIG. 2 is a diagram illustrating an example of a position where the two radar apparatuses 10 and 20 illustrated in FIG. 1 are arranged. The radar system 1 according to the present embodiment is configured to calculate the horizontal wind direction and wind speed at each point in a predetermined area using two radar devices 10 and 20 arranged at positions separated from each other. Yes. In the radar system 1 according to the present embodiment, the Doppler is calculated based on the difference between the frequency of the transmission wave and the frequency of the reflected wave that returns after being reflected by precipitation particles (rain, snow, hail, hail) in the atmosphere. Using the speed, the direction and magnitude of the wind speed at each point (that is, the wind speed vector V) is calculated. That is, in the radar system 1, the wind speed vector V at the point where the Doppler speed is observed is calculated.

  As shown in FIG. 1, the radar system 1 includes two radar devices 10 and 20, a wind speed vector calculation unit 2, a display image generation unit 3, and a display 4.

  Each radar device 10, 20 includes antennas 11, 21, circulators 12, 22, transmission waveform generators 13, 23, amplifiers 14, 24, transmitters 15, 25, receivers 16, 26, Band pass filters 17 and 27, amplification units 18 and 28, and signal processing units 19 and 29 are provided. The radar apparatuses 10 and 20 have the same configuration except that the installation positions are different. Therefore, only the configuration of the radar apparatus 10 will be described below, and the description of the configuration of the radar apparatus 20 will be omitted.

  The antenna 11 is provided as a wave transmission unit that transmits an electromagnetic wave as a transmission wave, and is also provided as a wave reception unit that receives a reflected wave of the transmission wave. A transmission signal output from the transmitter 15 is input to the antenna 11 via the circulator 12. A transmission wave generated from the transmission signal is transmitted from the antenna 11. The antenna 11 outputs a reception signal obtained from the received reflected wave to the receiver 16 via the circulator 12.

  The circulator 12 switches to a connection in which a transmission signal is transmitted from the transmitter 15 to the antenna 11 during transmission. In addition, the circulator 12 switches to a connection in which a reception signal obtained from a reception wave received by the antenna 11 is sent from the antenna 11 to the receiver 16 at the time of reception.

  The transmission waveform generation unit 13 generates a transmission signal having a waveform that is a basis of the transmission wave transmitted from the antenna 11. The transmission signal generated by the transmission waveform generation unit 13 is amplified by the amplification unit 14 and then output to the antenna 11 via the transmitter 15 and the circulator 12.

  The receiver 16 receives a reception signal obtained from the reception wave received by the antenna 11 via the circulator 12. The reception signal received by the receiver 16 is subjected to removal of unnecessary signals such as noise by the band-pass filter 17, amplified by the amplification unit 18, and then output to the signal processing unit 19.

FIG. 3 is a schematic diagram showing wind speed vectors Vp ₁₀ and Vp ₂₀ at a certain point p calculated by the signal processing units 19 and 29.

Referring to FIG. 3, the wind speed vectors (wind direction and wind speed) that can be calculated by the signal processing unit 19 include the radar device 10 provided with the signal processing unit 19 among the wind speed vectors Vp at the target point P, and the target. Only the component Vp _{10 in} the direction d ₁₀ along the straight line connecting the point P. On the other hand, the wind speed vector that can be calculated by the signal processing unit 29 includes the radar device 20 provided with the signal processing unit 29 among the wind speed vectors Vp at the target point P, and the target point P where the wind direction and the wind speed are calculated. Only the component Vp _{20 in} the direction d ₂₀ along the straight line connecting. Here, as described above, since the radar apparatus 10 and the radar apparatus 20 are arranged at different positions with respect to each other, the wind direction that can be calculated by the signal processing unit 19 and the wind direction that can be calculated by the signal processing unit 29. The direction is different.

Referring to FIG. 3, the wind speed vector calculation unit 2 is based on the wind speed vector Vp ₁₀ calculated by the signal processing unit 19 of the radar device ₁₀ and the wind speed vector Vp ₂₀ calculated by the signal processing unit 29 of the radar device 20. The wind speed vector Vp at the target point P is calculated. Specifically, the wind speed vector calculation unit 2 calculates the wind speed vector Vp of the target point P by combining the vector Vp ₁₀ and the vector Vp ₂₀ . The method for calculating the wind speed vector Vp described here is a method called a dual Doppler method.

  FIG. 4 is a diagram showing the wind speed vector distribution VM calculated by the wind speed vector calculation unit 2. The wind speed vector calculation unit 2 generates the wind speed vector distribution VM, which is the distribution of the wind speed vector V at each point, by performing the above-described vector synthesis process for each point where the Doppler velocity is observed. In this wind speed vector distribution VM, the direction of the wind speed corresponds to the direction of the arrow shown in FIG. 4, and the magnitude of the wind speed corresponds to the length of the arrow shown in FIG.

  FIG. 5 is a diagram illustrating an example of the error rate distribution EM (reliability distribution) stored in the error rate distribution storage unit 5 (reliability distribution storage unit) of the display image generation unit 3. FIG. 6 is a diagram showing an image generated by the display image generating unit 3 and displayed on the display device 4.

  In the radar system 1 according to the present embodiment, the wind speed vector V at each point is calculated using the dual Doppler method described above with reference to FIG. On the other hand, when the wind speed at each point is calculated using the dual Doppler method, the magnitude of the wind speed error at that point is determined by the position of the wind speed calculation target point with respect to the two radar devices 10 and 20. Referring to FIG. 5, in FIG. 5, a region Za having a high dot density has a small velocity error rate, and a region Zc having a low dot density has a large velocity error rate. That is, the speed vector at the point included in the region Za has high reliability, and the speed vector at the point included in the region Zc has low reliability. Specifically, in the present embodiment, the speed error rate of the speed vector at the point included in the region Za is less than 30%, and the speed error rate of the speed vector at the point included in the region Zb is 30% or more and less than 50%. The speed error rate of the speed vector at the points included in the region Zc is 50% or more. In the case of the radar system 1 according to the present embodiment, the distribution of speed error rates determined by the positions where the two radar devices 10 and 20 installed at different positions are installed as the error rate distribution EM as an error rate distribution storage unit. 5 is stored. Note that the speed error rate ranges (30% to less than 50%, etc.) of the points included in each of the regions Za, Zb, and Zc illustrated here are merely examples, and other ranges may be used.

As shown in FIG. 6, the display image generation unit 3 is an image in which the wind speed vector distribution VM generated by the wind speed vector calculation unit 2 and the error rate distribution EM stored in the error rate distribution storage unit 5 are superimposed. Is generated. Specifically, the display image generation unit 3 causes the positions where the radar apparatuses 10 and 20 are installed in the wind speed vector distribution VM and the positions of the two radar apparatuses 10 and 20 in the error rate distribution EM match. In addition, an image in which the wind speed vector distribution VM and the error rate distribution EM are superimposed is generated. The display 4 displays the image. Thereby, the user can grasp | ascertain the error rate of the wind speed in each point at a glance by seeing the said display screen. For example, referring to FIG. 6, since the point P1 is included in the region Za where the error rate of the wind speed in the error rate distribution EM is within 30%, the error of the wind speed at the point P1 is within 30%. Can be guessed. Specifically, if the wind speed at the point P1 is 10 m / s, it can be estimated that the wind speed at the point P1 is within a range of 7 to 13 m / s. On the other hand, since the point P2 is included in the region Zc where the error rate of the wind speed in the error rate distribution EM is 50% or more, it can be estimated that the error of the wind speed at the point P2 is 50% or more.

[effect]
As described above, according to the radar system 1 according to the present embodiment, the error rate of the wind speed vector V at each point where the Doppler velocity is observed is the reliability of the wind speed vector V calculated corresponding to each point. Displayed on the display 4. Thereby, since the user can know the degree of accuracy of the wind speed vector V calculated corresponding to each point (that is, the reliability of the wind speed vector V), the wind speed vector V at each point can be more accurately determined. I can grasp it.

  Therefore, according to the radar system 1, it is possible to provide a radar system that can display the error rate (reliability) of the wind speed vector V displayed on the display 4 on the display 4.

  Further, according to the radar system 1, the wind speed vector V is calculated by the two radar devices 10 and 20 arranged at different positions. Thus, for example, as in the present embodiment, the wind speed vector V can be calculated using the Doppler speed, and therefore the wind speed vector V at each point can be appropriately calculated.

  Further, according to the radar system 1, the error rate distribution EM, which is a distribution of the error rate of the wind speed at each point, determined based on the position where the two radar devices are arranged is stored. That is, according to the radar system 1, it is not necessary to calculate the error rate of the wind speed for each of the wind speed vectors V calculated at each point. Therefore, according to the radar system 1, the calculation load for calculating the error rate of the wind speed at each point can be reduced.

  Further, according to the radar system 1, the wind speed vector distribution VM and the error rate distribution EM are displayed in an overlapping manner. Thereby, the user can easily estimate how much the wind speed vector V at each point actually falls within the range.

  Further, according to the radar system 1, the wind speed vector V at each point is calculated based on the so-called dual Doppler method, so that the wind speed vector V at each point can be appropriately calculated.

[Modification]
As mentioned above, although embodiment of this invention was described, this invention is not limited to these, A various change is possible unless it deviates from the meaning of this invention.

  (1) In the radar system 1 according to the above-described embodiment, only the error rate (reliability) of the wind speed is displayed, but not limited to this, only the reliability of the wind direction may be displayed, or the reliability of the wind speed. Both the degree and the reliability of the wind direction may be displayed.

  (2) FIG. 7 is an enlarged view showing a part of a display image displayed on a display device of a radar system according to a modification. In the radar system 1 according to the embodiment, the error rate distribution EM of the wind speed is displayed as the reliability. However, the present invention is not limited to this, and other reliability may be displayed. Specifically, referring to FIG. 7, for example, the error rate of the wind speed at each point is ranked according to the magnitude (for example, A to D), and the alphabets A to D are assigned to the respective points. May be displayed in the vicinity of the arrow of the wind speed vector V displayed in FIG.

(3) In the radar system 1 according to the above-described embodiment, the wind speed vector distribution VM and the error rate distribution EM are displayed so as to overlap each other. However, the present invention is not limited thereto, and the wind speed vector distribution VM and the error rate distribution EM are displayed on the display 4. May be displayed separately. Alternatively, for example, when the user selects a wind speed vector at a desired point in the wind speed vector distribution VM, for example, the configuration may be such that the wind speed error rate of the speed vector at the point is displayed.

  (4) In the radar system 1 according to the above-described embodiment, the wind direction and the wind speed at each point are calculated using the two radar devices 10 and 20. However, the present invention is not limited to this, and each point is determined by one or three or more radar devices. The wind direction and the wind speed may be calculated.

  (5) FIG. 8 is a block diagram showing a configuration of a radar system 1a according to a modification. In the radar system 1 according to the above embodiment, the wind direction and the wind speed at each point are calculated based on the so-called dual Doppler method using the two radar devices 10 and 20, but the present invention is not limited to this. In the radar system 1a described in detail below, the wind direction and wind speed at each point are calculated based on a so-called simplified VVP (Velocity Volume Processing) method.

  The simplified VVP method described above is a method obtained by simplifying the VVP method, and is a method capable of calculating the wind direction and the wind speed in a local region (small region, hereinafter, this local region is referred to as a cell). is there. This simplified VVP method is also called a local VAD method. Since the simplified VVP method is a known technique, its detailed description is omitted.

  As shown in FIG. 8, the radar system 1 a includes a single radar device 10 a, a wind speed vector calculation unit 2 a, a display image generation unit 3 a, and a display 4. The configuration of one radar apparatus 10a is the same as the configuration of each of the radar apparatuses 10 and 20 of the above-described embodiment. On the other hand, the wind speed vector calculation unit 2a and the display image generation unit 3a are different in operation from the wind speed vector calculation unit 2a and the display image generation unit 3a of the above embodiment. Below, a different part from the said embodiment is mainly demonstrated, and description is abbreviate | omitted about another part.

  The wind speed vector calculation unit 2a calculates the wind direction and the wind speed of each cell using the Doppler velocities at each of a plurality of points included in each cell, measured by the radar apparatus 10a. Specifically, the wind speed vector calculation unit 2a calculates the Doppler speed Vr at each of a plurality of points in the cell and the horizontal wind speeds u and v (where u is the speed in the east-west direction and v is the speed in the north-south direction). In the meantime, the wind direction and the wind speed of each cell are calculated by using the following equation.

[Equation 1]
Vr = u · cos θ sin φ + v · cos θ cos φ (1)

  However, (theta) is an elevation angle and (phi) is an azimuth angle.

In the case of the present embodiment, the wind speed vector calculation unit 2a uses the azimuth angle φ _i (i is a natural number, and is assigned to each point included in the cell) at a predetermined interval for each elevation angle. to calculate the measured Doppler velocity Vr _i. The wind velocity vector calculation unit 2a, for example by using a least square method or the like, extracts a predetermined condition is satisfied Vr _i of Vr _i, coefficients of equation (1) as extracted Vr _i is most fit u , V are determined. Thereby, the wind direction and the wind speed in each cell are calculated. The predetermined condition is satisfied Vr _i, a Vr _i coefficients u, v are spaced wide relative to the formula (1) determined becomes less than a predetermined threshold value. Further, in the following, a sample having a predetermined condition is satisfied Vr i _(extracted Vr i as described _above), referred to as the reliability calculation target sample.

The wind speed vector calculation unit 2 a further includes a reliability calculation unit 6. As described in detail below, the reliability calculation unit 6 calculates the reliability of the wind direction and the wind speed calculated for each cell. More specifically, the reliability calculation unit 6 calculates a plurality of reliability (first to fourth reliability) as one of values 1 to 4, and integrates the plurality of reliability to obtain a total reliability. Is calculated as any one of A to D. Each reliability (first to fourth reliability) indicates that the data is highly reliable as the value increases. In addition, the total reliability indicates that the data is highly reliable as it goes from D to A.

Reliability calculation unit 6, in order to calculate the first reliability, the number na of the point where the Doppler velocity is calculated, the coefficient described above u, Vr _i used to determine v is calculated in each cell The first reliability is calculated based on the number nb of the determined points (that is, the number of reliability calculation target samples). Specifically, the reliability calculation unit 6 determines the first reliability according to the numerical value N1 obtained by dividing nb by na. For example, as an example, the reliability calculation unit 6 sets the first reliability to 1 when N1 <0.25, sets the first reliability to 2 when 0.25 ≦ N1 <0.5, and sets 0 The first reliability is set to 3 when .5 ≦ N1 <0.75, and the first reliability is set to 4 when N1 ≧ 0.75.

  In addition, the reliability calculation unit 6 calculates the second reliability based on the absolute value of the wind speed in each cell and the error in the wind speed in each cell in order to calculate the second reliability. Specifically, the reliability calculation unit 6 determines the second reliability according to a numerical value N2 calculated for each cell, which is a value N2 obtained by dividing the error of the wind speed by the absolute value of the wind speed. For example, as an example, the reliability calculation unit 6 sets the second reliability to 1 when N2 ≧ 0.5, sets the second reliability to 2 when 0.4 ≦ N2 <0.5, and sets 0 The second reliability is set to 3 when 3 ≦ N2 <0.4, and the second reliability is set to 4 when N2 ≦ 0.3.

  Further, the reliability calculation unit 6 calculates the third reliability based on the absolute value of the wind direction error in each cell in order to calculate the third reliability. For example, as an example, the reliability calculation unit 6 sets the third reliability to 1 when the absolute value N3 of the wind direction error is 45 degrees or more, and the third reliability when N3 is 30 degrees or more and less than 45 degrees. Is set to 2, the third reliability is set to 3 when N3 is 12 degrees or more and less than 30 degrees, and the third reliability is set to 4 when N3 is less than 12 degrees.

  Further, the reliability calculation unit 6 calculates the fourth reliability based on an angle formed by a straight line connecting the radar position and the center point of each cell and the wind direction calculated corresponding to each cell. The fourth reliability is calculated. For example, as an example, the reliability calculation unit 6 sets the fourth reliability to 1 when the angle N4 is 87.5 degrees or more and 90 degrees or less, and when N4 is 85 degrees or more and less than 87.5 degrees. The fourth reliability is set to 2, the fourth reliability is set to 3 when N4 is 80 degrees or more and less than 85 degrees, and the fourth reliability is set to 4 when N4 is less than 80 degrees.

  And the reliability calculation part 6 calculates total reliability based on the value of 4th reliability from the 1st reliability calculated as mentioned above. Specifically, the reliability calculation unit 6 sets the total reliability to A when the total of the first reliability to the fourth reliability is 14 to 16, and sets the total reliability when the total is 10 to 13. When the sum is 6 to 9, the total reliability is C. When the sum is 4 or 5, the total reliability is D. This total reliability is calculated for each wind velocity vector V calculated corresponding to each cell.

  FIG. 7 is an enlarged view showing a part of a display screen displayed on the display 4 of the radar system 1a according to the present modification. In the radar system 1a according to this modification, the total reliability calculated corresponding to each point is displayed in the vicinity of the wind velocity vector V at each point as one of alphabets A, B, C, and D. Thereby, the user can judge that the direction and the magnitude of the wind speed vector V to which the alphabet A is attached are highly reliable. On the other hand, the user can determine that the direction and the magnitude of the wind speed vector V to which the alphabet D is attached are low in reliability.

  As described above, according to the radar system 1a according to the present modification, the wind speed vector V can be calculated by one radar apparatus 10a. Therefore, the configuration of the radar system 1a compared to the case of the radar system 1 according to the above-described embodiment. Can be simplified.

  Further, according to the radar system 1a, the reliability (total reliability) is calculated for each wind speed vector V at each point, and the total reliability is displayed near the wind speed vector V at each point. Thereby, the user can grasp | ascertain easily the reliability of the wind speed vector V in each point.

  Further, according to the radar system 1a, the wind speed vector V is calculated by the simplified VVP method, so that the wind speed vector V can be appropriately calculated.

  Further, according to the radar system 1a, the total reliability obtained by comprehensively evaluating a plurality of reliability levels (first to fourth reliability levels) is calculated, and this total reliability level corresponds to the velocity vector at each point. Is displayed. Thereby, the reliability having higher accuracy can be calculated.

  (6) According to the radar system 1 a according to the modification described with reference to FIG. 8, the wind speed vector V at each point is calculated by the simplified VVP method. May be calculated. For example, as an example, the wind speed vector V may be calculated using the VVP method.

  (7) FIG. 9 is an enlarged view of a part of the display screen of the radar system according to the modification. In the radar system according to this modification, the circles drawn corresponding to the respective wind speed vectors V according to the magnitude of the value N1 calculated by the reliability calculation unit 6 of the modification described with reference to FIG. The size of the diameter is determined. Thus, the user can determine that the reliability of the wind speed vector V marked with the circle is high if the diameter of the circle is large, while the wind speed marked with the circle is small if the diameter of the circle is small. It can be determined that the reliability of the vector V is low.

  (8) FIG. 10 is an enlarged view of a part of the display screen of the radar system according to the modification. In the radar system according to this modification, the direction and magnitude of the wind speed that can be taken by each speed vector according to the values of N2 and N3 calculated by the reliability calculation unit 6 of the modification described with reference to FIG. Display as an error bar. Thereby, the user can grasp | ascertain directly the error of each wind speed vector V with an error bar.

  (9) FIG. 11 is an enlarged view of a part of the display screen of the radar system according to the modification. In the radar system according to the present modification, each wind speed vector V is displayed as a solid line or a dotted line based on the value of N4 calculated by the reliability calculation unit 6 of the modification described with reference to FIG. Specifically, for example, as an example, the wind speed vector V having an N4 value of 87.5 degrees or more and 90 degrees or less is displayed by a dotted line, and the wind speed vector V having an N4 value of less than 87.5 degrees is a solid line. Is displayed. Thereby, the user can determine that the magnitude and direction of the wind speed vector V displayed by the solid line is high in reliability, and determines that the reliability of the magnitude and direction of the wind speed vector V displayed in the dotted line is low. it can.

  (10) FIG. 12 is an enlarged view of a part of the display screen of the radar system according to the modification. As shown in FIG. 12, as a method of displaying the reliability displayed on the display screen, the circle described with reference to FIG. 9, the error bar described with reference to FIG. 10, and the wind speed described with reference to FIG. You may combine with the dotted line display of the vector V. FIG.

(11) FIG. 13 is a block diagram of a radar system 1b according to a modification. In the radar system 1 according to the above embodiment, the wind direction and the wind speed at each point are calculated based on the so-called dual Doppler method using the two radar devices 10 and 20, but the present invention is not limited to this. In the radar system 1b, the wind direction and the wind speed at each point are calculated based on the so-called triple Doppler method.

  The radar system 1b includes another radar device 30 in addition to the two radar devices 10 and 20 included in the radar system 1b according to the embodiment. That is, the radar system 1b includes three radar devices 10, 20, and 30. As with the other radar devices 10 and 20, the radar device 30 includes an antenna 31, a circulator 32, a transmission waveform generation unit 33, an amplification unit 34, a transmitter 35, a receiver 36, and a bandpass filter 37. , An amplification unit 38 and a signal processing unit 39 are provided. Since the configuration and operation of these components included in the radar device 30 are the same as the components included in the radar devices 10 and 20, description thereof is omitted.

  In the radar system 1b, by using the triple Doppler method using the three radar devices 10, 20, and 30, the wind direction and the wind speed in the horizontal direction and the vertical direction (that is, the wind speed vector in the three-dimensional space) are calculated. . Thus, according to the radar system 1b, not only the wind direction and wind speed in the horizontal direction but also the wind direction and wind speed in the vertical direction can be calculated. In the radar system 1b, at least one radar device (for example, the radar device 30) is installed at a height position different from that of other radar devices. Thereby, it becomes possible to calculate the wind direction and the wind speed in the vertical direction as described above. Since the triple Doppler method is a known technique, a detailed description thereof is omitted.

  Also in the radar system 1b, as in the case of the above-described embodiment, the error rate of the wind speed vector at each point is displayed on the display 4 as the reliability of the wind speed vector calculated corresponding to each point. Thereby, like the case of the said embodiment, the wind speed vector V of each point can be grasped | ascertained more correctly.

1, 1a, 1b Radar system 2, 2a Wind speed vector calculation unit 4 Display

Claims (6)

Based on the reception signal generated from the reflected wave of the transmission wave transmitted from the transmission unit, the wind speed vector calculation unit that calculates the wind speed vector at each point and the wind speed vector distribution that is the distribution thereof, and the wind speed vector distribution is A radar system comprising: an indicator to be displayed;
Each including the transmission unit, and each of the transmission units includes at least two radar devices arranged at different positions;
The wind speed vector calculation unit calculates the wind speed vector based on a reception signal generated from the reflected wave received by each radar device,
A reliability distribution storage unit that stores a wind speed vector reliability distribution, which is a distribution of reliability of the wind speed vector at each point, determined based on positions where the at least two radar devices are disposed; ,
The radar system according to claim 1, wherein the wind speed vector reliability is also displayed on the display. The radar system according to claim 1,
The radar system according to claim 1, wherein the wind speed vector reliability distribution is superimposed on the wind speed vector distribution and displayed on the display. 3. The radar system according to claim 1 , wherein the wind speed vector is calculated using a dual Doppler method. The radar system according to claim 1 or 2 , wherein
Each including the transmission unit, and each of the transmission units includes at least three radar devices arranged at different positions;
A radar system, wherein the wind speed vector is calculated using a triple Doppler method. The radar system according to any one of claims 1 to 4 , wherein
A reliability calculation unit that calculates the reliability for each wind speed vector at each point;
The radar system according to claim 1, wherein the reliability is displayed on the display unit corresponding to the wind speed vector. The radar system according to claim 5 ,
The radar system according to claim 1, wherein the wind velocity vector calculation unit calculates the wind velocity vector using a simplified VVP method.

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