JPH0968568A - Radar receiving equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radar receiving equipment with good yield and high angle-tracking performance in which the gains and transmitted phases of a former stage analog signal processing circuit and a latter stage analog signal processing circuit of two channels are not needed to be conformed to each other by hardware, test control is facilitated, and selection of parts is also dispensed with. SOLUTION: A false signal having two frequency components is generated by a false signal generator 12a, a power distributor 13, a low frequency signal oscillator 12b, a hybrid 15, and a mixer 15, and false signal input is switched by a switch 3. This equipment has such a con configuration that the gain error and transmitted phase error of two former stage analog signal processing circuits 5a, 5b and the gain error and transmitted phase error of two latter stage analog signal processing circuits 8a, 8b can be detected, and corrected by signal processing 11 operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radar receiver for emitting a radio wave, receiving the radio wave and identifying a target.

[0002]

2. Description of the Related Art FIG. 11 is a block diagram showing the structure of a conventional radar receiving apparatus of this type. In the figure, 1 is an antenna, 2 is a monopulse comparator, 5a and 5b are pre-stage analog signal processing circuits, 7 is a 90 degree hybrid,
Reference numerals 8a and 8b are post-stage analog signal processing circuits, 10 is an analog data / digital data converter (hereinafter referred to as A / D converter), and 11 is a signal processor.

Next, the operation will be described. In FIG. 11, the antenna 1 has two parts with overlapping directions and different directions.
The reflected radio waves from the target are received by the antenna beams. The two signals received by the antenna 1 are converted by the monopulse comparator 2 into a sum signal and a difference signal of the two signals. The sum signal and the difference signal are amplified, frequency-converted, and gain-controlled by the two preceding analog signal processing circuits 5a and 5b, and the sum intermediate frequency signal (hereinafter referred to as Σ) and the difference intermediate frequency signal (hereinafter referred to as Δ). Be converted to). Σ and Δ are vector-synthesized by the 90-degree hybrid 7, and M1 and M are given by Equation 1, respectively.
Converted to 2. Here, vector composition is expressed by the equation 1.

[0004]

[Equation 1]

Here, Σ, Δ, M1 and M2 are complex representations of the signal, and multiplication of j represents advancing the phase by 90 degrees. Further, in Equation 1, the conversion loss and the proportionality constant representing the transmission phase are omitted. M1 and M2 are converted into signals m1 and m2 which are amplified, frequency-converted, gain-controlled, and phase-detected by the post-stage analog signal processing circuit 8a and the post-stage analog signal processing circuit 8b, respectively. m1, m2
Is converted into a digital signal by the A / D converter 10 and input to the signal processor 11. In the signal processor 11, after performing frequency analysis by Fourier transform, an operation corresponding to the inverse operation of vector synthesis is performed on each frequency component, and Σ and Δ are amplified, frequency converted, gain controlled, and phase-detected signals σ and δ.
Ask for. Here, the vector composition inverse operation is expressed by the equation 2.

[0006]

[Equation 2]

Here, σ, δ, m1 and m2 are complex expressions of the signal, and the proportional constant is omitted in the equation (2). The signal processor 11 converts δ obtained by the vector synthesis inverse operation into σ
Then, the angle error voltage is obtained by normalization, and the target is tracked by correcting the antenna beam direction for the angle error. The reason why vector synthesis is performed is to prevent the signal-to-noise ratio from deteriorating in the A / D converter 10 because δ is smaller than σ.

In the radar receiver, a gain error (hereinafter referred to as a preceding amplitude error) and a transmission phase difference error (hereinafter referred to as a preceding stage phase error) exist between the preceding analog signal processing circuit 5a and the preceding analog signal processing circuit 5b. Therefore, the ratio between Σ and Δ at the input terminal of the 90-degree hybrid 7 does not preserve the ratio between the sum signal and the difference signal at the two output terminals of the monopulse comparator. Further, since there is a gain error (hereinafter referred to as a post-stage amplitude error) and a transmission phase difference error (hereinafter referred to as a post-stage phase error) between the post-stage analog signal processing circuits 8a and 8b, m1 and m2 The ratio is M1 and M2
Ratio is not preserved. The amplitude error and the phase error degrade the angle tracking performance of the radar device.

[0009]

Since the conventional radar receiver is configured as described above, the gain and the transmission phase of the 2-channel front-stage analog signal processing circuit and the 2-channel rear-stage analog signal processing circuit are set by hardware. It is necessary to match (hereinafter referred to as H / W), it is difficult to perform test adjustment, and the yield is poor because it is necessary to select parts, and the angle tracking performance is limited by the characteristics of H / W. There were challenges.

The present invention has been made to solve the above problems, and it is necessary to match the gain and transmission phase of the two-channel front-stage analog signal processing circuit and the rear-stage analog signal processing circuit by H / W. It is an object of the present invention to provide a radar receiving device that has no problems, is easy to perform test adjustment, does not require selection of parts, has a good yield, and has high angle tracking performance.

[0011]

A radar receiver according to a first embodiment of the present invention comprises a pseudo signal oscillator, a power distributor, a low frequency signal oscillator, a hybrid, two mixers, a reception signal and a pseudo signal. And a switch for switching the input of
The configuration is such that the gain error and the transmission phase error of each of the preceding analog signal processing circuits and the two subsequent analog signal processing circuits can be detected and corrected by the signal processing calculation.

The radar receiver according to the second embodiment of the present invention is a pseudo signal oscillator, a power distributor, a low frequency signal oscillator, a hybrid, two mixers, and input switching between a reception signal and a pseudo signal. Switch and a pre-stage analog signal processing circuit having a gain transmission phase adjustment function, and inputs two pseudo signals of frequency components to input two pre-stage analog signal processing circuits and two post-stage analog signal processing circuits. The gain error and the transmission phase error of 2 are detected, and the gain error and the transmission phase error of the two preceding analog signal processing circuits are corrected by using the control of the gain and the transmission phase by the control signal.
The configuration is such that the gain error and the transmission phase error of the subsequent analog signal processing circuits can be corrected by signal processing calculation.

Further, the radar receiver according to the third embodiment of the present invention is a pseudo signal oscillator, a power distributor, a low frequency signal oscillator, a hybrid, two mixers, and input switching between a reception signal and a pseudo signal. Switch and a post-stage analog signal processing circuit having a gain transmission phase adjustment function, and inputs two pseudo signals of frequency components to input two pre-stage analog signal processing circuits and two post-stage analog signal processing circuits. Gain error and transmission phase error of the two preceding-stage analog signal processing circuits are corrected using signal processing calculation, and gain error and transmission phase error of the two succeeding-stage analog signal processing circuits are detected. Is configured to be corrected by controlling the gain and the transmission phase by the control signal.

The radar receiver according to the fourth embodiment of the present invention includes a pseudo signal oscillator, a power distributor, a low frequency signal oscillator, a hybrid, two mixers, and input switching between the reception signal and the pseudo signal. Switch, a front-stage analog signal processing circuit having a gain transmission phase adjustment function, and a rear-stage analog signal processing circuit having a gain transmission phase adjustment function are provided, and two pseudo signals of two frequency components are input. The configuration is such that the gain error and the transmission phase error of the front stage analog signal processing circuit and the two rear stage analog signal processing circuits can be detected and corrected by controlling the gain and the transmission phase by the control signal.

The radar receiving apparatus according to the fifth embodiment of the present invention includes a pseudo signal oscillator, a power distributor, two modulation signal generators, two modulators, and input switching between a reception signal and a pseudo signal. For detecting the gain error and the transmission phase error of the two front-stage analog signal processing circuits and the two rear-stage analog signal processing circuits by inputting pseudo signals of two frequency components, and performing a signal processing operation. The configuration can be corrected by.

The radar receiving apparatus according to the sixth embodiment of the present invention includes a pseudo signal oscillator, a power distributor, two modulation signal generators, two modulators, and input switching between a reception signal and a pseudo signal. Switch and a pre-stage analog signal processing circuit having a gain transmission phase adjustment function, and inputs two pseudo signals of frequency components to input two pre-stage analog signal processing circuits and two post-stage analog signal processing circuits. Gain error and transmission phase error of the two preceding-stage analog signal processing circuits are corrected, and the gain error and transmission phase error of the two preceding-stage analog signal processing circuits are corrected using the control of gain and transmission phase by the control signal. The configuration is such that the gain error and the transmission phase error can be corrected by the signal processing calculation.

The radar receiving apparatus according to the seventh embodiment of the present invention includes a pseudo signal oscillator, a power distributor, two modulation signal generators, two modulators, and input switching between a reception signal and a pseudo signal. Switch and a post-stage analog signal processing circuit having a gain transmission phase adjustment function, and inputs two pseudo signals of frequency components to input two pre-stage analog signal processing circuits and two post-stage analog signal processing circuits. Gain error and transmission phase error of the two preceding-stage analog signal processing circuits are corrected using signal processing calculation, and gain error and transmission phase error of the two succeeding-stage analog signal processing circuits are detected. Is configured to be corrected by controlling the gain and the transmission phase by the control signal.

The radar receiver according to the eighth embodiment of the present invention includes a pseudo signal oscillator, a power distributor, two modulation signal generators, two modulators, and input switching between a reception signal and a pseudo signal. Switch, a front-stage analog signal processing circuit having a gain transmission phase adjustment function, and a rear-stage analog signal processing circuit having a gain transmission phase adjustment function are provided, and two pseudo signals of two frequency components are input. The configuration is such that the gain error and the transmission phase error of the front stage analog signal processing circuit and the two rear stage analog signal processing circuits can be detected and corrected by controlling the gain and the transmission phase by the control signal.

[0019]

According to the first embodiment of the present invention, the radar receiver receives the pseudo signal oscillator, the power distributor, the low frequency signal oscillator, the hybrid, the two mixers, the reception signal and the pseudo signal. A switch for switching and inputting pseudo signals of two frequency components to detect gain error and transmission phase error of two front-stage analog signal processing circuits and two rear-stage analog signal processing circuits, and perform signal processing. Since the correction can be performed by calculation, the gain and transmission phase of the 2-channel front-stage analog signal processing circuit and the gain and transmission phase of the 2-channel rear-stage analog signal processing circuit are set to H /
There is no need to make the values coincide with each other with W, so that test adjustment is easy, component selection is not required, and a yield is good, and a radar receiving apparatus with high angle tracking performance can be obtained.

According to the second embodiment of the present invention, the radar receiver includes a pseudo signal oscillator, a power distributor, a low frequency signal oscillator, a hybrid, two mixers, a reception signal and a pseudo signal. And a front stage analog signal processing circuit having a gain transmission phase adjustment function, and inputs two pseudo signals of frequency components to input two front stage analog signal processing circuits and two rear stage analogs. The gain error and the transmission phase error of the signal processing circuit are detected, and the gain error and the transmission phase error of the two front-stage analog signal processing circuits are corrected using the control of the gain and the transmission phase by the control signal, and the two rear-stage analog signals. Since the gain error and the transmission phase error of the processing circuit can be corrected by the signal processing calculation, the gain, the transmission phase and the transmission phase of the two-channel preceding analog signal processing circuit can be corrected. It is not necessary to match the gain and transmission phase of the post-stage analog signal processing circuit of 2 channels with H / W, and the test adjustment is easy. Moreover, the selection of parts is unnecessary, the yield is good, and the radar reception with high angle tracking performance. The device can be obtained.

According to the third embodiment of the present invention, the radar receiver includes a pseudo signal oscillator, a power distributor, a low frequency signal oscillator, a hybrid, two mixers, a reception signal and a pseudo signal. Switch for input switching and a post-stage analog signal processing circuit having a gain transmission phase adjusting function are provided, and two post-stage analog signal processing circuits and two post-stage analog signals are inputted by inputting pseudo signals of two frequency components. The gain error and the transmission phase error of the signal processing circuit are detected, the gain error and the transmission phase error of the two front-stage analog signal processing circuits are corrected using the signal processing calculation, and the gain error and the transmission phase error of the two rear-stage analog signal processing circuits are detected. Since the transmission phase error can be corrected by controlling the gain and the transmission phase by the control signal, the gain, the transmission phase and the transmission phase of the two-channel preceding analog signal processing circuit can be corrected. It is not necessary to match the gain and transmission phase of the post-stage analog signal processing circuit of 2 channels with H / W, and the test adjustment is easy. Moreover, the selection of parts is unnecessary, the yield is good, and the radar reception with high angle tracking performance. The device can be obtained.

According to the fourth embodiment of the present invention, the radar receiver includes a pseudo signal oscillator, a power distributor, a low frequency signal oscillator, a hybrid, two mixers, a reception signal and a pseudo signal. A switch for input switching, a front stage analog signal processing circuit having a gain transmission phase adjustment function, and a rear stage analog signal processing circuit having a gain transmission phase adjustment function, and inputs pseudo signals of two frequency components. The gain error and the transmission phase error of the two front stage analog signal processing circuits and the two rear stage analog signal processing circuits are detected,
Since the gain and the transmission phase can be corrected by controlling the gain and the transmission phase by the control signal, the gain and the transmission phase of the 2-channel front-stage analog signal processing circuit and the gain and the transmission phase of the 2-channel rear-stage analog signal processing circuit are H / W. Therefore, it is possible to obtain a radar receiving device that does not need to be matched with each other, that test adjustment is easy, that parts are not required to be selected, yield is good, and angle tracking performance is high.

According to the fifth embodiment of the present invention, the radar receiver includes a pseudo signal oscillator, a power distributor, two modulation signal generators, two modulators, a reception signal and a pseudo signal. And a switch for input switching of 2 to input pseudo signals of two frequency components to detect gain error and transmission phase error of two front-stage analog signal processing circuits and two rear-stage analog signal processing circuits, Since the correction can be performed by the signal processing calculation, the gain and the transmission phase of the 2-channel front-stage analog signal processing circuit and the gain and the transmission phase of the 2-channel rear-stage analog signal processing circuit are set to H / W.
Therefore, it is possible to obtain a radar receiving device that does not need to be matched with each other, that test adjustment is easy, that parts are not required to be selected, yield is good, and angle tracking performance is high.

According to the sixth embodiment of the present invention, the radar receiver includes a pseudo signal oscillator, a power distributor, two modulation signal generators, two modulators, a reception signal and a pseudo signal. And a front stage analog signal processing circuit having a gain transmission phase adjustment function, and inputs two pseudo signals of frequency components to input two front stage analog signal processing circuits and two rear stage analogs. The gain error and the transmission phase error of the signal processing circuit are detected, and the gain error and the transmission phase error of the two front-stage analog signal processing circuits are corrected using the control of the gain and the transmission phase by the control signal, and the two rear-stage analog signals. Since the gain error and the transmission phase error of the processing circuit can be corrected by the signal processing calculation,
It is not necessary to match the gain and transmission phase of the front-stage analog signal processing circuit of the channel and the gain and transmission phase of the second-stage analog signal processing circuit of the two channels with H / W, easy test adjustment, and no need to select parts. Therefore, it is possible to obtain a radar receiving device having a high yield and a high angle tracking performance.

According to the seventh embodiment of the present invention, the radar receiver includes a pseudo signal oscillator, a power distributor, two modulation signal generators, two modulators, a reception signal and a pseudo signal. And a rear stage analog signal processing circuit having a gain transmission phase adjusting function, and inputs two pseudo signals of two frequency components to input two front stage analog signal processing circuits and two rear stage analogs. The gain error and the transmission phase error of the signal processing circuit are detected, the gain error and the transmission phase error of the two front-stage analog signal processing circuits are corrected using the signal processing calculation, and the gain error and the transmission phase error of the two rear-stage analog signal processing circuits are detected. Since the transmission phase error can be corrected by controlling the gain and the transmission phase by the control signal,
It is not necessary to match the gain and transmission phase of the front-stage analog signal processing circuit of the channel and the gain and transmission phase of the second-stage analog signal processing circuit of the two channels with H / W, easy test adjustment, and no need to select parts. Therefore, it is possible to obtain a radar receiving device having a high yield and a high angle tracking performance.

According to the eighth embodiment of the present invention, the radar receiver includes a pseudo signal oscillator, a power distributor, two modulation signal generators, two modulators, a reception signal and a pseudo signal. A switch for input switching, a front stage analog signal processing circuit having a gain transmission phase adjustment function, and a rear stage analog signal processing circuit having a gain transmission phase adjustment function,
Pseudo signals of two frequency components are input to detect gain error and transmission phase error of two front-stage analog signal processing circuits and two rear-stage analog signal processing circuits, and correction is performed by control of gain and transmission phase by a control signal. Since it is configured, it is not necessary to match the gain and transmission phase of the 2-channel front-stage analog signal processing circuit and the gain and transmission phase of the 2-channel rear-stage analog signal processing circuit with H / W, and the test adjustment is easy. In addition, it is possible to obtain a radar receiving device that does not require selection of parts, has a high yield, and has high angle tracking performance.

[0027]

【Example】

Embodiment 1 FIG. First Embodiment FIG. 1 is a block diagram showing the configuration of a radar receiving apparatus showing a first embodiment of the present invention. In the figure, 1,
2, 5a to 11 are the same as those of the conventional device, and
And 4 are switches, 12a is a pseudo signal oscillator, 12b is a low frequency signal oscillator, 13 is a power distributor, 14 is a 90 degree hybrid, and 15a and 15b are mixers.

Next, the operation will be described. In FIG. 1, a switch 3 and a switch 4 switch between the output signal of the monopulse comparator 2 and the output signal of the mixer 15a or the mixer 15b, and output the signal to the preceding analog signal processing circuit 5a and the preceding analog signal processing circuit 5b. The operation when the switch 3 and the switch 4 are connected to the monopulse comparator 2 side will be described below. In FIG. 1, an antenna 1 is partially overlapped and has two different directions.
The reflected radio waves from the target are received by the antenna beams. The two signals received by the antenna 1 are converted by the monopulse comparator 2 into a sum signal and a difference signal of the two signals. The sum signal and the difference signal are amplified by the pre-stage analog signal processing circuit 5a and the pre-stage analog signal processing circuit 5b,
Frequency conversion and gain control are performed and converted into Σ and Δ. Σ and Δ are vector-synthesized by 90 degree hybrid 7 and the number 1
Are converted to M1 and M2, respectively.

Here, Σ, Δ, M1 and M2 are complex representations of the signal, and multiplying j represents advancing the phase by 90 degrees. Further, in Equation 1, the conversion loss and the proportionality constant representing the transmission phase are omitted. M1 and M2 are amplified, frequency-converted, gain-controlled, and phase-detected by the post-stage analog signal processing circuit 8a and the post-stage analog signal processing circuit 8b, respectively, and converted into m1 and m2. m1 and m2 are A /
The signal is converted into a digital signal by the D converter 10 and input to the signal processor 11. In the signal processor 11, after Fourier transform and frequency analysis, calculation corresponding to the inverse calculation of vector synthesis is performed for each frequency component, and Σ and Δ are rear stage analog signal processing circuit 8a and rear stage analog signal processing circuit 8b.
The gain, the amplification in the transmission phase, the frequency conversion, the gain control, and the phase-detected signals σ and δ are obtained. Here, the vector composition inverse operation is expressed by the equation 2.

Here, σ, δ, m1 and m2 are complex expressions of the signal, and the constant of proportionality is omitted in Equation 2. The signal processor 11 converts δ obtained by the vector synthesis inverse operation into σ
Then, the angle error voltage is obtained by normalization, and the target is tracked by correcting the antenna beam direction for the angle error. The reason why vector synthesis is performed is to prevent the signal-to-noise ratio from deteriorating in the A / D converter 10 because δ is smaller than σ.

In the radar receiver, since there is a preceding-stage amplitude error and a preceding-stage phase error between the preceding-stage analog signal processing circuit 5a and the preceding-stage analog signal processing circuit 5b, the ratio of Σ and Δ at the input terminal of the 90-degree hybrid 7 is , The ratio of the sum signal and the difference signal at the output terminal of the monopulse comparator 2 is not stored. Further, since there is a post-stage amplitude error and a post-stage phase difference between the post-stage analog signal processing circuit 8a and the post-stage analog signal processing circuit 8b, the ratio of m1 and m2 is not stored as the ratio of M1 and M2N. The angle tracking performance of the radar device deteriorates due to the amplitude error and the phase error. For this reason, BIT
The error is automatically detected and corrected by (Built In Test).

The switches 3 and 4 are the mixer 15a.
And the operation when connected to the mixer 15b side is shown below. In FIG. 1, the pseudo signal oscillator 12a generates a pseudo signal having a frequency f0 which is substantially the same as the reception frequency. The pseudo signal of the pseudo signal oscillator 12a is distributed by the power distributor 13,
It is input to the mixer 15a and the mixer 15b. On the other hand, the low-frequency signal oscillator 12b generates a signal having a frequency f1 sufficiently low with respect to the frequency band of the receiving device. The signal generated by the low frequency signal oscillator 12b is a 90 degree hybrid 14
Is distributed to one mixer 15a and one to the mixer 15a.
b. At this time, the signal input to the mixer 15b is a signal having the same amplitude and a phase advanced by 90 degrees with respect to the signal input to the mixer 15a. If this is expressed in a complex expression and the signal input to the mixer 15a is 1, the signal input to the mixer 15b is j. The mixers 15a and 15b output the sum phase φs and the difference phase φd for the two types of input signals. This is expressed by Equation 3.

[0033]

(Equation 3)

Where fs is the frequency component of the sum of f0 and f1, fd is the frequency component of the difference between f0 and f1, φ0 is the initial phase component of the pseudo signal oscillator 12a, and φ1 is the initial phase component of the low frequency signal oscillator 12b. Is. Mixer 15 from number 3
When the output signal of a is 1, the output signal of the mixer 15b is j at fs and -j at fd. This signal is input to the switches 3 and 4, respectively. Here, the transfer function of the front stage analog signal processing circuit 5a is G1, the transfer function of the front stage analog signal processing circuit 5b is A1G1, the transfer function of the rear stage analog signal processing circuit 8a is G2, and the transfer function of the rear stage analog signal processing circuit 8b is A2G2. And A1 is a complex number representing a preceding-stage amplitude error and a preceding-stage phase error, and A2 is a complex number representing a following-stage amplitude error and a following-stage phase error.
The pseudo signals input to the switches 3 and 4 are amplified, frequency-converted, and gain-controlled by the two front-stage analog signal processing circuits 5a and 5b, vector-combined by the 90-degree hybrid 7, and the two rear-stage analog signal processing circuits 8a and 5b. 8
Amplification, frequency conversion, gain control by b, m1s, m
2s, m1d, m2d. Where m1s and m2
s, m1d, m2d are complex representations of signals, m1s is the output of the post-stage analog signal processing circuit 8a by fs, m1
d is the output of the post-stage analog signal processing circuit 8a by fd,
m2s is the output of the post-stage analog signal processing circuit 8b based on fs, and m2d is the post-stage analog signal processing circuit 8b based on fd.
Represents the output of. Here, m1s, m2s, m1d, m
2d is represented by Formula 4.

[0035]

(Equation 4)

In the equation 4, the conversion loss and the proportional constant representing the transmission phase at the time of vector combination are omitted. m1s, m2
s, m1d, m2d are Fourier transformed by the signal processor,
Desired. By simultaneously using Equation 4 and erasing G1 and G2, A1 representing the former-stage amplitude error, the former-stage phase error, and A2 representing the latter-stage amplitude error and the latter-stage phase error are obtained. Here, A1 and A2 are expressed by Equation 5.

[0037]

(Equation 5)

By the calculation of the signal processor 11, before the vector synthesis reciprocal calculation, m2 is multiplied by the reciprocal of A2 to correct the post-stage amplitude error and the post-phase post-difference, and after the vector synthesis reciprocal calculation, δ is reciprocal of A1. The former stage amplitude error and the former stage phase error are corrected by multiplying by.

In this way, by correcting the front-stage amplitude error, the front-stage phase error, the rear-stage amplitude error, and the rear-stage phase error,
It is not necessary to match the characteristics of 2 channels with H / W,
It is possible to obtain a radar receiving apparatus in which test adjustment is easy, component selection is not required, the yield is good, and the angle tracking performance is high.

Example 2. Second Embodiment FIG. 2 is a block diagram showing the configuration of a radar receiver showing a second embodiment of the present invention. In the figure, 1 to 5a and 7 to 15b are exactly the same as those of the first embodiment, and 6 is a pre-stage analog signal processing circuit having functions of gain control and phase control of external control.

Next, the operation will be described. In FIG. 2, target tracking operation when the switches 3 and 4 are connected to the monopulse comparator 2 side, and amplitude error and phase error detection operation when the switches 3 and 4 are connected to the mixer 15a and mixer 15b sides Is Example 1
Is the same as Further, the correction of the latter-stage amplitude error and the latter-stage phase error is performed by the calculation of the signal processor 11 as in the first embodiment. Further, the control signal changes the gain and the transmission phase of the front-stage analog signal processing circuit 6 to correct the front-stage amplitude error and the front-stage phase error.

As described above, by correcting the front-stage amplitude error, the front-stage phase error, the rear-stage amplitude error, and the rear-stage phase error, it is not necessary to match the characteristics of the two channels in H / W, and the test adjustment is easy. In addition, it is possible to obtain a radar receiving device that does not require selection of parts, has a high yield, and has high angle tracking performance.

Example 3. Third Embodiment FIG. 3 is a block diagram showing the configuration of a radar receiver showing a third embodiment of the present invention. In the figure, 1 to 8a and 10 to 15b are exactly the same as those of the first embodiment, and 9 is a post-stage analog signal processing circuit having functions of gain control and phase control of external control.

Next, the operation will be described. In FIG. 3, target tracking operation when the switches 3 and 4 are connected to the monopulse comparator 2 side, and amplitude error and phase error detection operation when the switches 3 and 4 are connected to the mixer 15a and mixer 15b sides Is Example 1
Is the same as The correction of the former-stage amplitude error and the former-stage phase error is performed by the calculation of the signal processor 11 as in the first embodiment. Further, the control signal changes the gain and the transmission phase of the post-stage analog signal processing circuit 9 to correct the post-stage amplitude error and the post-stage phase error.

As described above, by correcting the front-stage amplitude error, the front-stage phase error, the rear-stage amplitude error, and the rear-stage phase error, it is not necessary to match the characteristics of the two channels in H / W, and the test adjustment is easy. In addition, it is possible to obtain a radar receiving device that does not require selection of parts, has a high yield, and has high angle tracking performance.

Example 4. Fourth Embodiment FIG. 4 is a block diagram showing the configuration of a radar receiver showing a fourth embodiment of the present invention. In the figure, 1 to 5a, 7 to 8a and 10 to 15b are exactly the same as those of the first embodiment, 6 is exactly the same as that of the second embodiment, and 9 is exactly the same as that of the third embodiment. .

Next, the operation will be described. In FIG. 4, target tracking operation when the switches 3 and 4 are connected to the monopulse comparator 2 side, and amplitude error and phase error detection operation when the switches 3 and 4 are connected to the mixer 15a and mixer 15b sides Is Example 1
Is the same as Further, the control signal changes the gain and the transmission phase of the front-stage analog signal processing circuit 6 to correct the front-stage amplitude error and the front-stage phase error. Further, the gain and the transmission phase of the post-stage analog signal processing circuit 9 are changed according to the control signal to correct the post-stage amplitude error and the post-stage phase error.

As described above, by correcting the front-stage amplitude error, the front-stage phase error, the rear-stage amplitude error, and the rear-stage phase error, it is not necessary to match the characteristics of the two channels in H / W, and the test adjustment is easy. In addition, it is possible to obtain a radar receiving device that does not require selection of parts, has a high yield, and has high angle tracking performance.

Example 5. Fifth Embodiment FIG. 5 is a block diagram showing the configuration of a radar receiver showing a fifth embodiment of the present invention. In the figure, 1 to 13 are exactly the same as those in the first embodiment,
16a and 16b are modulation signal generators, and 17a and 17b are modulators.

Next, the operation will be described. In FIG. 5, switches 3 and 4 switch between the output signal of the monopulse comparator 2 and the output signal of the modulator 17a or modulator 17b, and output the signal to the pre-stage analog signal processing circuit 5a and the pre-stage analog signal processing circuit 5b. . The operation when the switch 3 and the switch 4 are connected to the monopulse comparator 2 side is the same as in the first embodiment.

In the radar receiving apparatus, since there is a preceding-stage amplitude error and a preceding-stage phase error between the preceding-stage analog signal processing circuit 5a and the preceding-stage analog signal processing circuit 5b, the ratio of Σ and Δ at the input terminal of the 90-degree hybrid 7 is , The ratio of the sum signal and the difference signal at the output terminal of the monopulse comparator 2 is not stored. Further, since there is a post-stage amplitude post-difference and a post-stage phase error between the post-stage analog signal processing circuit 8a and the post-stage analog signal processing circuit 8b, the ratio of M1 and M2 is not stored as the ratio of m1 and m2. The angle tracking performance of the radar device deteriorates due to the amplitude error and the phase error. Therefore, the error is automatically detected and corrected by BIT.

The operation when the switch 3 is connected to the modulator 17a side and the switch 4 is connected to the modulator 17b side will be described below. In FIG. 5, the pseudo signal oscillator 12a generates a pseudo signal having a frequency f0 which is substantially the same as the reception frequency. The signal generated by the pseudo signal oscillator 12a is distributed by the power distributor 13 and input to the modulator 17a and the modulator 17b.
Here, the modulator 17a and the modulator 17b will be described as digital binary phase modulators of 0 and π. The modulation signal generator 16a and the modulation signal generator 16b generate a modulation signal having a frequency f1 sufficiently low with respect to the frequency band of the receiving device. FIG. 6 shows the modulation signal input from the modulation signal generator 16a to the modulator 17a, the modulation signal input from the modulation signal generator 16b to the modulator 17b, and the output signals of the modulated modulator 17a and modulator 17b. Show. Where modulator 1
A signal obtained by Fourier-transforming the output voltage Va of 7a is expressed by Equation 6.

[0053]

(Equation 6)

On the other hand, since the modulation signal of the modulation signal generator 16b leads the modulation signal of the modulation signal generator 16a by 90 degrees in the phase of the modulation signal frequency f1, when the output voltage Va of the modulator is Fourier-transformed. Signal is expressed by equation 7.

[0055]

(Equation 7)

FIG. 7 shows the equations 6 and 7 in terms of spectra. From FIG. 7, assuming that Va is 1, Vb is j for the fs component and −j for the fd component. Va and Vb are
They are input to the switch 3 and the switch 4, respectively. Using this frequency component, the pre-stage amplitude error, the pre-stage phase error, the post-stage amplitude error, and the post-stage phase error are corrected by the same operation as in the first embodiment.

As described above, by correcting the front-stage amplitude error, the front-stage phase error, the rear-stage amplitude error, and the rear-stage phase error, it is not necessary to match the characteristics of the two channels in H / W, and the test adjustment is easy. In addition, it is possible to obtain a radar receiving device that does not require selection of parts, has a high yield, and has high angle tracking performance.

Example 6. Embodiment 6 FIG. 8 is a block diagram showing the structure of a radar receiver showing Embodiment 6 of the present invention. In the figure, 1 to 5a and 7 to 17b are exactly the same as those of the fifth embodiment, and 6 is a pre-stage analog signal processing circuit having functions of gain control and phase adjustment of external control.

Next, the operation will be described. In FIG. 8, target tracking operation when the switches 3 and 4 are connected to the monopulse comparator 2 side, amplitude error and phase error when the switches 3 and 4 are connected to the modulator 17a side and the modulator 17b side The detection operation of is similar to that of the fifth embodiment. Further, the correction of the latter-stage amplitude error and the latter-stage phase error is performed by the calculation of the signal processor 11 as in the fifth embodiment. Further, the control signal changes the gain and the transmission phase of the front-stage analog signal processing circuit 6 to correct the front-stage amplitude error and the front-stage phase error.

As described above, by correcting the front-stage amplitude error, the front-stage phase error, the rear-stage amplitude error, and the rear-stage phase error, it is not necessary to match the characteristics of the two channels in H / W, and the test adjustment is easy. In addition, it is possible to obtain a radar receiving device that does not require selection of parts, has a high yield, and has high angle tracking performance.

Example 7. Embodiment 7 FIG. 9 is a block diagram showing the configuration of a radar receiver showing Embodiment 7 of the present invention. In the figure, 1 to 8a and 10 to 17b are exactly the same as those of the fifth embodiment, and 9 is a post-stage analog signal processing circuit having functions of gain control and phase control of external control.

Next, the operation will be described. In FIG. 9, the target tracking operation when the switches 3 and 4 are connected to the monopulse comparator 2 side and the amplitude error and the phase error when the switches 3 and 4 are connected to the modulator 17a and modulator 17b sides are shown. The detection operation is the fifth embodiment.
Is the same as Further, the correction of the preceding-stage amplitude error and the preceding-stage phase error is performed by the calculation of the signal processor 11 as in the fifth embodiment. Further, the control signal changes the gain and the transmission phase of the post-stage analog signal processing circuit 9 to correct the post-stage amplitude error and the post-stage phase error.

As described above, by correcting the front-stage amplitude error, the front-stage phase error, the rear-stage amplitude error, and the rear-stage phase error, it is not necessary to match the characteristics of the two channels in H / W, and the test adjustment is easy. In addition, it is possible to obtain a radar receiving device that does not require selection of parts, has a high yield, and has high angle tracking performance.

Embodiment 8 FIG. Embodiment 8 FIG. 10 is a block diagram showing the structure of a radar receiver showing Embodiment 8 of the present invention. In the figure, 1 to 5a, 7 to 8a and 10 to 17b are exactly the same as those of the fifth embodiment, 6 is exactly the same as that of the sixth embodiment, and 9 is exactly the same as that of the seventh embodiment. .

Next, the operation will be described. In FIG. 10, the target tracking operation when the switches 3 and 4 are connected to the monopulse comparator 2 side, and the amplitude error and the phase error when the switches 3 and 4 are connected to the modulator 17a and modulator 17b sides are shown. The detection operation is the fifth embodiment.
Is the same as Further, the gain and the transmission phase of the front-stage analog signal processing circuit 6 are changed by the control signal to correct the front-stage amplitude error and the front-stage phase error. Also, by the control signal,
The gain and the transmission phase of the post-stage analog signal processing circuit 9 are changed to correct the post-stage amplitude error and the post-stage phase error.

As described above, by correcting the front-stage amplitude error, the front-stage phase error, the rear-stage amplitude error, and the rear-stage phase error, it is not necessary to match the characteristics of the two channels in H / W, and the test adjustment is easy. In addition, it is possible to obtain a radar receiving device that does not require selection of parts, has a high yield, and has high angle tracking performance.

In the fifth to eighth embodiments described above, the case where the digital binary phase modulator is used is described, but even in the case of other modulators, the amplitude difference which is different between the two frequency components is different. , If the amplitude difference and the phase difference are known values, the same operation can be expected.

In the above embodiment, the case where the preceding stage amplitude error, the preceding stage phase error, the latter stage amplitude error and the latter stage phase error are corrected for the difference signal has been described. Even when the error, the latter-stage amplitude error, and the latter-stage phase error are corrected, the same operation can be expected.

In the above-mentioned embodiment, the case where the present invention is applied to a 2-channel radar receiver is described, but in addition to the case where 2 channels of a multi-channel radar receiver have the configuration of the above-mentioned embodiment. Needless to say, it can be used.

[0070]

According to the first embodiment of the present invention, a radar receiver includes a pseudo signal oscillator, a power distributor, a low frequency signal oscillator, a hybrid, two mixers, a reception signal and a pseudo signal. And a switch for input switching of
By inputting pseudo signals of two frequency components, gain errors and transmission phase errors of two front-stage analog signal processing circuits and two rear-stage analog signal processing circuits can be detected and corrected by signal processing calculation. Therefore, it is not necessary to match the gain and transmission phase of the 2-channel front-stage analog signal processing circuit and the gain and transmission phase of the 2-channel rear-stage analog signal processing circuit with H / W, which facilitates test adjustment and further It is possible to obtain a radar receiving device that does not require selection, has a high yield, and has high angle tracking performance.

According to the second embodiment of the present invention, the radar receiver inputs the pseudo signal oscillator, the power distributor, the low frequency signal oscillator, the hybrid, the two mixers, the reception signal and the pseudo signal. A switch for switching and a pre-stage analog signal processing circuit having a gain transmission phase adjustment function are provided, and two pre-stage analog signal processing circuits and two post-stage analog signal processing are input by inputting pseudo signals of two frequency components. The gain error and the transmission phase error of the circuit are detected, and the gain error and the transmission phase error of the two preceding analog signal processing circuits are corrected using the control of the gain and the transmission phase by the control signal.
Since the gain error and the transmission phase error of each of the rear-stage analog signal processing circuits can be corrected by the signal processing calculation, the gain and the transmission phase of the front-channel analog signal processing circuit of 2 channels and the rear-stage analog signal processing circuit of 2 channels Since it is not necessary to match the gain and transmission phase of H / W with each other, the test adjustment is easy, the selection of parts is not required, the yield is good, and the radar receiving device with high angle tracking performance can be obtained.

According to the third embodiment of the present invention, the radar receiver inputs the pseudo signal oscillator, the power distributor, the low frequency signal oscillator, the hybrid, the two mixers, the reception signal and the pseudo signal. A switch for switching and a post-stage analog signal processing circuit having a gain transmission phase adjusting function are provided, and two pseudo-signals of two frequency components are input to input two post-stage analog signal processing circuits and two post-stage analog signal processings. The gain error and the transmission phase error of the circuit are detected, the gain error and the transmission phase error of the two front-stage analog signal processing circuits are corrected by the signal processing operation, and the gain error and the transmission phase of the two rear-stage analog signal processing circuits are corrected. Since the error can be corrected by controlling the gain and the transmission phase by the control signal, the gain, the transmission phase, and the two channels of the 2-channel preceding analog signal processing circuit are corrected. This is a radar receiver that does not need to match the gain and transmission phase of the analog signal processing circuit in the latter stage of the channel with H / W, facilitates test adjustments, does not require component selection, has good yield, and has high angle tracking performance. Can be obtained.

According to the fourth embodiment of the present invention, the radar receiver inputs the pseudo signal oscillator, the power distributor, the low frequency signal oscillator, the hybrid, the two mixers, the reception signal and the pseudo signal. A switch for changeover, a front stage analog signal processing circuit having a gain transmission phase adjustment function, and a rear stage analog signal processing circuit having a gain transmission phase adjustment function are provided, and two pseudo signals of two frequency components are input. Since the pre-stage analog signal processing circuit and the two post-stage analog signal processing circuits can detect the gain error and the transmission phase error and can be corrected by controlling the gain and the transmission phase by the control signal, the 2-channel front stage analog signal It is not necessary to match the gain and the transmission phase of the signal processing circuit and the gain and the transmission phase of the two-stage analog signal processing circuit after the channel in H / W. Settling is easy and better sorting the yield becomes unnecessary parts can angle tracking performance is obtained with high radar receiver.

According to the fifth embodiment of the present invention, the radar receiver inputs the pseudo signal oscillator, the power distributor, the two modulation signal generators, the two modulators, the reception signal and the pseudo signal. A switch for switching and inputting pseudo signals of two frequency components to detect gain error and transmission phase error of two front-stage analog signal processing circuits and two rear-stage analog signal processing circuits, and perform signal processing. Since the configuration is such that it can be corrected by calculation, it is not necessary to match the gain and transmission phase of the front channel analog signal processing circuit of 2 channels and the gain and transmission phase of the rear channel analog signal processing circuit of 2 channels in H / W It is possible to obtain a radar receiver that is easy to adjust, does not need to select parts, has a good yield, and has high angle tracking performance.

According to the sixth embodiment of the present invention, the radar receiver inputs the pseudo signal oscillator, the power distributor, the two modulation signal generators, the two modulators, the reception signal and the pseudo signal. A switch for switching and a pre-stage analog signal processing circuit having a gain transmission phase adjustment function are provided, and two pre-stage analog signal processing circuits and two post-stage analog signal processing are input by inputting pseudo signals of two frequency components. A gain error and a transmission phase error of the circuit are detected, and a gain error and a transmission phase error of the two front-stage analog signal processing circuits are corrected by using gain and transmission phase control by a control signal, and two rear-stage analog signal processing circuits. The gain error and the transmission phase error of the two channels can be corrected by the signal processing calculation. The gain and transmission phase of the analog signal processing circuit need not be the same for H / W, it is easy to test adjustment may further sorting the yield becomes unnecessary parts,
It is possible to obtain a radar receiver having high angle tracking performance.

According to the seventh embodiment of the present invention, the radar receiver inputs the pseudo signal oscillator, the power distributor, the two modulation signal generators, the two modulators, the reception signal and the pseudo signal. A switch for switching and a post-stage analog signal processing circuit having a gain transmission phase adjustment function are provided, and two pre-stage analog signal processing circuits and two post-stage analog signal processing are input by inputting pseudo signals of two frequency components. The gain error and the transmission phase error of the circuit are detected, the gain error and the transmission phase error of the two front-stage analog signal processing circuits are corrected by the signal processing operation, and the gain error and the transmission phase of the two rear-stage analog signal processing circuits are corrected. Since the error can be corrected by controlling the gain and the transmission phase by the control signal, the gain, the transmission phase and the after-channel of the 2-channel front-stage analog signal processing circuit are corrected. The gain and transmission phase of the analog signal processing circuit need not be the same for H / W, it is easy to test adjustment may further sorting the yield becomes unnecessary parts,
It is possible to obtain a radar receiver having high angle tracking performance.

According to the eighth embodiment of the present invention, the radar receiver inputs the pseudo signal oscillator, the power distributor, the two modulation signal generators, the two modulators, the reception signal and the pseudo signal. A switch for changeover, a front stage analog signal processing circuit having a gain transmission phase adjustment function, and a rear stage analog signal processing circuit having a gain transmission phase adjustment function are provided, and two pseudo signals of two frequency components are input. Since the pre-stage analog signal processing circuit and the two post-stage analog signal processing circuits can detect the gain error and the transmission phase error and can be corrected by controlling the gain and the transmission phase by the control signal, the 2-channel front stage analog signal The gain of the signal processing circuit,
It is not necessary to match the transmission phase and the gain and transmission phase of the post-stage analog signal processing circuit of 2 channels with H / W,
It is possible to obtain a radar receiving apparatus in which test adjustment is easy, component selection is not required, the yield is good, and the angle tracking performance is high.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a configuration of a radar receiver according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a radar receiver according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a radar receiver according to Embodiment 4 of the present invention.

FIG. 5 is a block diagram showing a configuration of a radar receiver according to a fifth embodiment of the present invention.

6A and 6B are a modulation signal and a modulator output signal according to Embodiment 5 of the present invention.

FIG. 7 is a spectrum of a modulator output signal according to the fifth embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration of a radar receiver according to a sixth embodiment of the present invention.

FIG. 9 is a block diagram showing the configuration of a radar receiver according to a seventh embodiment of the present invention.

FIG. 10 is a block diagram showing the configuration of a radar receiver according to an eighth embodiment of the present invention.

FIG. 11 is a block diagram showing the configuration of a conventional radar receiver of this type.

[Explanation of symbols]

2 monopulse comparator, 3 switches, 4 switches, 5 front stage analog signal processing circuit, 6 front stage analog signal processing circuit with gain adjustment and phase adjustment function by external control, 7 90 degree hybrid, 8 rear stage analog signal processing circuit, 9 external control A post-stage analog signal processing circuit having gain adjustment and phase adjustment functions by 10 A / D converter, 11 signal processor, 12a pseudo signal oscillator, 12
b low frequency signal oscillator, 13 power divider, 1490
Degree hybrid, 15 mixer, 16 modulation signal generator, 17 modulator.

Claims (8)

[Claims] 1. A monopulse comparator connected to an antenna, two switches connected to the output terminal of the monopulse comparator, two pre-stage analog signal processing circuits connected to each of the two switches, and 2. 90-degree hybrid connected to the preceding analog signal processing circuit, two post-stage analog signal processing circuits connected to the 90-degree hybrid, and two analogs respectively connected to the two post-stage analog signal processing circuits A data / digital data converter, a signal processor connected to the two analog data / digital data converters, a pseudo signal oscillator, a power distributor connected to the pseudo signal oscillator, and a low frequency signal oscillator, A hybrid connected to the low frequency signal oscillator, one output signal of the power divider and one output signal of the hybrid Is used as an input signal, and two mixers respectively connected to one of the two switches are provided. 2. A monopulse comparator connected to an antenna, two switches connected to the output terminal of the monopulse comparator, and two switches connected to each of the two switches, and inside either or both of the two switches. Two pre-stage analog signal processing circuits having a function of adjusting gain and phase by a control signal from the signal processor, a 90-degree hybrid connected to the two pre-stage analog signal processing circuits, and a 90-degree hybrid are connected. And two analog data / digital data converters respectively connected to the two subsequent analog signal processing circuits and two analog data / digital data converters. A signal processor, a pseudo signal oscillator, a power distributor connected to the pseudo signal oscillator, a low frequency signal oscillator, and a low frequency A hybrid signal oscillator, and two mixers each having one output signal of the power distributor and one output signal of the hybrid as input signals and respectively connected to one of the two switches. A radar receiving device characterized by the above. 3. A monopulse comparator connected to the antenna, two switches connected to the output terminals of the monopulse comparator, two pre-stage analog signal processing circuits connected to each of the two switches, and A 90-degree hybrid connected to the preceding analog signal processing circuit, and a function to adjust the gain and phase by a control signal from the signal processor, which is connected to the 90-degree hybrid and is included in both or either of the two. And two analog data / digital data converters respectively connected to the two post-stage analog signal processing circuits, and two analog data / digital data converters Signal processor, a pseudo signal oscillator, a power distributor connected to the pseudo signal oscillator, a low frequency signal oscillator, A hybrid connected to the frequency signal oscillator, and two mixers each having one output signal of the power distributor and one output signal of the hybrid as an input signal and respectively connected to one of the two switches. A radar receiving device characterized by the above. 4. A monopulse comparator connected to an antenna, two switches connected to the output terminal of the monopulse comparator, and two switches connected to each of the two switches, and inside or both of them. Two pre-stage analog signal processing circuits having a function of adjusting gain and phase by a control signal from the signal processor, a 90-degree hybrid connected to the two pre-stage analog signal processing circuits, and a 90-degree hybrid are connected. Two post-stage analog signal processing circuits having a function of adjusting gain and phase by a control signal from a signal processor in both or either of the two, and two post-stage analog signal processing circuits, respectively. Connected to two analog data / digital data converters connected and two analog data / digital data converters. Signal processor, pseudo signal oscillator, power distributor connected to the pseudo signal oscillator, low frequency signal oscillator, hybrid connected to the low frequency signal oscillator, and one output signal of the power distributor hybrid A radar receiving device comprising: two output signals of one input signal and two mixers respectively connected to one of the two switches. 5. A monopulse comparator connected to the antenna, two switches connected to the output terminal of the monopulse comparator, two pre-stage analog signal processing circuits connected to each of the two switches, and 90-degree hybrid connected to the preceding analog signal processing circuit, two post-stage analog signal processing circuits connected to the 90-degree hybrid, and two analogs respectively connected to the two post-stage analog signal processing circuits Data / digital data converter, signal processor connected to two analog data / digital data converters, pseudo signal oscillator, power distributor connected to pseudo signal oscillator, and two modulation signal generation And one output signal of the power distributor and one signal of the modulation signal generator as input signals, and one of the two switches A radar receiver comprising two modulators connected to each other. 6. A monopulse comparator connected to an antenna, two switches connected to an output terminal of the monopulse comparator, and two switches connected to each of the two switches, and inside or both of them. Two pre-stage analog signal processing circuits having a function of adjusting gain and phase by a control signal from the signal processor, a 90-degree hybrid connected to the two pre-stage analog signal processing circuits, and a 90-degree hybrid are connected. And two analog data / digital data converters respectively connected to the two subsequent analog signal processing circuits and two analog data / digital data converters. A signal processor, a pseudo signal oscillator, a power distributor connected to the pseudo signal oscillator, two modulation signal generators, A radar comprising: one output signal of the power distributor and one signal of the modulation signal generator as input signals; and two modulators respectively connected to one of the two switches. Receiver. 7. A monopulse comparator connected to the antenna, two switches connected to the output terminals of the monopulse comparator, two pre-stage analog signal processing circuits connected to each of the two switches, and two. A 90-degree hybrid connected to the preceding analog signal processing circuit, and a function to adjust the gain and phase by a control signal from the signal processor, which is connected to the 90-degree hybrid and is included in both or either of the two. And two analog data / digital data converters respectively connected to the two subsequent analog signal processing circuits and two analog data / digital data converters Signal processor, a pseudo signal oscillator, a power distributor connected to the pseudo signal oscillator, and two modulation signal generators , And two modulators each having one output signal of the power distributor and one signal of the modulation signal generator as an input signal and respectively connected to one of the two switches. Radar receiver. 8. A monopulse comparator connected to an antenna, two switches connected to the output terminal of the monopulse comparator, and two switches connected to each of the two switches, and inside or both of them. Two pre-stage analog signal processing circuits having a function of adjusting gain and phase by a control signal from the signal processor, a 90-degree hybrid connected to the two pre-stage analog signal processing circuits, and a 90-degree hybrid are connected. Two post-stage analog signal processing circuits having a function of adjusting gain and phase by a control signal from a signal processor in both or either of the two, and two post-stage analog signal processing circuits, respectively. Connected to two analog data / digital data converters connected and two analog data / digital data converters. Signal processor, a pseudo signal oscillator, a power distributor connected to the pseudo signal oscillator, two modulation signal generators, one output signal of the power distributor and one signal of the modulation signal generator Is used as an input signal, and two modulators respectively connected to one of the two switches are provided.