JP2021038975A - Rader system, and rader test method - Google Patents

Abstract

To enable narrowing down the defective portions when the evaluation result is not good.SOLUTION: A receiving unit 13 converts an analog radar reception signal received by a plurality of receiving antenna elements of a receiving module 12 into a digital radar reception signal. An excitation unit 16 generates a pilot signal that imitates the analog radar reception signal when a pseudo target is assumed. During a test, a signal switching unit 17 selectively inputs the pilot signal into the analog radar reception signal at two or more locations from the receiving module 12 to an input end of the receiving unit 13. A signal processing unit 14 performs digital beamforming processing on a plurality of digital reception signals to generate a target signal representing a target included in the analog radar reception signal. A display unit 15 displays the target signal.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to radar devices and radar test methods.

A phased array radar device is known as a radar used for capturing a target object such as an aircraft. The phased array radar device emits radio waves by using a plurality of antenna elements arranged in an array and an electronically controllable phase device, and receives the reflections thereof. The phased array radar device directs the direction of radio waves in a desired direction by controlling the phases of radio waves radiated from a plurality of antenna elements and radio waves received by a plurality of antenna elements using a phase device. Can be done.

As a related technique, Patent Document 1 discloses a phased array radar device having a means for checking a tracking function with respect to a target. The phased array radar device described in Patent Document 1 has a pseudo target signal generator. The pseudo target signal generator generates a pseudo target signal similar to the transmission signal while setting the amplitude and generation timing based on the distance information of the pseudo target set in advance. In the phased array radar device, the pseudo target signal is input to the receiving circuit in place of the radar receiving signal output from the antenna element. In Patent Document 1, by using a pseudo target signal, it is possible to arbitrarily set a target necessary for system evaluation.

Japanese Unexamined Patent Publication No. 1-245173

Here, in Patent Document 1, a directional coupler is arranged immediately after each antenna element, and a pseudo target signal is input to the signal line of the received signal using the directional coupler. For example, the tester can carry out the system evaluation by examining whether or not the pseudo target is displayed at a position or density different from the preset distance. However, in Patent Document 1, when the evaluation result is not good, there is a problem that it is difficult to identify in which part from immediately after the antenna to the receiving circuit the defect occurs.

In view of the above circumstances, an object of the present disclosure is to provide a radar device capable of narrowing down defective parts and a radar test method when the evaluation result is not good.

In order to achieve the above object, the present disclosure discloses a transmission module including a plurality of transmitting antenna elements, a receiving module including a plurality of receiving antenna elements, and a plurality of received using the plurality of receiving antenna elements. A receiver that converts the analog radar reception signal of the above into a plurality of digital radar reception signals, and a target signal that represents a target object included in the analog radar reception signal by performing digital beam forming processing on the plurality of digital reception signals. A signal processing unit to be generated, a display unit to display the target signal, an excitation signal transmitted from the transmitting antenna element, and an excitation signal to generate a pilot signal imitating an analog radar reception signal assuming a pseudo target. The unit and the excitation signal generated by the excitation unit during radar transmission are supplied to the transmission module, and during the test, the analog is selectively used at two or more locations from the reception module to the input end of the reception unit. Provided is a radar device including a signal switching unit for inputting the pilot signal to a radar reception signal.

The present disclosure also generates a pilot signal that imitates an analog radar reception signal received by a reception antenna element from a reflection signal of an excitation signal transmitted from a transmission antenna when a pseudo target is assumed, and the analog radar. The pilot signal is selectively input to the analog radar reception signal at two or more points in the signal path of the reception signal, the analog radar reception signal is converted into a plurality of digital radar reception signals, and the plurality of digital reception signals are converted. Provided is a radar test method in which a digital beam forming process is performed on a target signal, a target signal representing a target object included in the analog radar reception signal is generated, and the target signal is displayed.

The radar device and radar test method according to the present disclosure can narrow down defective parts when the evaluation result is not good.

The block diagram which shows the schematic structure of the radar apparatus which concerns on this disclosure. The block diagram which shows the structure of the radar apparatus which concerns on 1st Embodiment of this disclosure. A block diagram showing a configuration example of a receiving module. The figure which shows the display example of a radar monitoring screen. The block diagram which shows the structure of the radar apparatus which concerns on 2nd Embodiment of this disclosure. The figure which shows the display example of the radar monitoring screen in 3rd Embodiment of this disclosure.

Prior to the description of the embodiments of the present disclosure, the outline of the present disclosure will be described. FIG. 1 shows a schematic configuration of a radar device according to the present disclosure. The radar device 10 includes a transmission module 11, a reception module 12, a reception unit 13, a signal processing unit 14, a display unit 15, an excitation unit 16, and a signal switching unit 17.

The transmission module 11 has a plurality of transmission antenna elements. The receiving module 12 has a plurality of receiving antenna elements. The receiving unit 13 converts the analog radar reception signal received by the plurality of receiving antenna elements of the receiving module 12 into a digital radar reception signal. The signal processing unit 14 performs digital beamforming (DBF) processing on a plurality of digital received signals to generate a target signal representing a target included in the analog radar received signal. The display unit 15 displays the target signal.

The excitation unit 16 generates an excitation signal transmitted from the transmission antenna element of the transmission module 11. Further, the excitation unit 16 generates a pilot signal that imitates an analog radar reception signal when a pseudo target is assumed. At the time of radar transmission, the signal switching unit 17 supplies the excitation signal generated by the excitation unit 16 to the transmission module 11. During the test, the signal switching unit 17 selectively inputs a pilot signal to the analog radar reception signal at two or more locations from the receiving module 12 to the input end of the receiving unit 13.

In the present disclosure, the radar device 10 is configured so that a pilot signal can be input to an analog radar reception signal at two or more locations from the reception module 12 to the input end of the reception unit 13. If there is no problem in the receiving system in the radar device 10, the pseudo target is displayed at the position assumed at the time of generating the pilot signal in the target signal. On the other hand, if there is a defect in the circuit that processes the analog radar reception signal or its signal path, it is considered that the position of the pseudo target deviates from the assumed position. Alternatively, it is possible that the display density of the pseudo target, which changes according to the amplitude of the pilot signal, is different from the assumed density. The examiner can change the position where the pilot signal is input when the position of the pseudo target deviates from the assumed position, that is, when the evaluation result is not good. After the change, if the pseudo target is displayed at the assumed position, it can be judged that the circuit after the position where the pilot signal is input is normal. As described above, in the present disclosure, when the evaluation result of the system using the pilot signal is not good, it is possible to narrow down the defective portion in the radar device 10.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. FIG. 2 shows a radar device according to the first embodiment of the present disclosure. The radar device 100 includes an excitation unit 101, a signal switching unit 102, a distributor 103, a transmission module 104, a reception module 111, a synthesizer 112, a directional coupler 113, a directional coupler 114, a reception unit 116, and a signal processing unit 117. , Display unit 118, and control unit 119. The radar device 100 corresponds to the radar device 10 of FIG.

In the present embodiment, the radar device 100 is configured as, for example, a pulse compression radar having high distance resolution. The radar device 100 has a digital beamforming processing function, and the antenna aperture is configured as a three-dimensional phased array radar in a two-dimensional array. The RF (Radio Frequency) signal transmitted by radar from the radar device 100 is, for example, a linear chirp signal such as a pulsed FM (Frequency Modulation) modulation signal, a pulsed CW (Continuous Wave) signal, or the like.

The excitation unit 101 generates an RF signal (excitation signal) transmitted by radar. Further, the excitation unit 101 generates a pilot signal used for a reception performance test (evaluation). The excitation unit 101 generates a signal imitating an analog radar reception signal assuming a pseudo target as a pilot signal. The signal switching unit 102 switches the supply destination of the signal generated by the excitation unit 101. At the time of radar transmission, the signal switching unit 102 supplies the excitation signal generated by the excitation unit 101 to the transmission module 104 via the distributor 103. At the time of the test, the signal switching unit 102 selectively outputs the pilot signal generated by the excitation unit 101 to the receiving module 111, the directional coupler 113, and the directional coupler 114. The excitation unit 101 corresponds to the excitation unit 16 of FIG. 1, and the signal switching unit 102 corresponds to the signal switching unit 17 of FIG.

The transmission module 104 radiates an excitation signal toward a space where a target such as an aircraft can exist. The transmission module 104 includes a plurality of antenna elements (transmission antenna elements), an amplifier, and a phase device. In the transmission module 104, the plurality of antenna elements are arranged two-dimensionally, for example. The distributor 103 distributes the excitation signal to a plurality of antenna elements. The amplifier of the transmission module 104 amplifies the distributed excitation signal. The phase device controls the phase of the excitation signal. The antenna element emits an excitation signal as a transmission beam.

In the present embodiment, the transmission module 104 controls the phase device for each beam (for each pulse repetition period (PRT)), and controls the direction of the transmission beam and the direction of the elevation angle. Here, the PRT includes a transmission time (radar pulse signal transmission) and a reception time immediately after (radar pulse signal reception). The PRT changes according to the orientation, elevation angle, distance, and the like. The transmission module 104 corresponds to the transmission module 11 of FIG.

The receiving module 111 includes a plurality of antenna elements (reception antenna elements). In the receiving module 111, the plurality of antenna elements are arranged two-dimensionally, for example. The reception module 111 receives a reception signal (analog radar reception signal) from the space including the reflection signal from the target. The receiving module 111 corresponds to the receiving module 12 of FIG.

FIG. 3 shows a configuration example of the receiving module 111. The receiving module 111 includes an antenna element 120, a directional coupler 121, an amplifier 122, and a phaser 123. Note that FIG. 3 shows the components for one channel of the analog radar reception signal. The receiving module 111 has a plurality of antenna elements 120, and has a directional coupler 121, an amplifier 122, and a phase device 123 corresponding to each of the plurality of antenna elements 120.

The antenna element 120 receives the analog radar reception signal. The directional coupler 121 inputs a pilot signal generated by the excitation unit 101 to the analog radar reception signal (its signal path). The amplifier 122 amplifies the analog radar received signal. The phase device 123 controls the phase of the analog radar received signal. The receiving module 111 controls the phase device for each PRT, and controls the direction of the receiving beam, the direction of the elevation angle, and the like.

Here, the excitation unit 101 (see FIG. 2) generates a signal equivalent to the RF signal transmitted by the radar in the PRT as a pilot signal at the reception time. The excitation unit 101 selects which elevation and directional beam the pilot signal is, or where and at what level the pseudo target reflection signal is generated in the pilot signal, depending on the distance and altitude of the pseudo target. The pilot signal is a signal that imitates an analog radar reception signal received by each antenna element 120 when a pseudo target exists at a set distance, altitude, or the like in space. The pilot signal is distributed corresponding to each antenna element 120 by using a distributor (not shown), and is input to the analog radar reception signal by using the directional coupler 121. After being input to the analog radar reception signal, the pilot signal is processed in the same manner as the analog radar reception signal.

The synthesizer 112 synthesizes analog radar reception signals of a plurality of antenna elements (channels). The synthesizer 112 synthesizes, for example, two left and right analog radar reception signals in the directional direction, and two analog radar reception signals in the elevation angle direction. When the radar device 100 is configured as a two-dimensional phased array radar of a one-dimensional array, all channels may be processed in the digital beamforming process, and the synthesizer 112 may not be required.

The receiving module 111 and the synthesizer 112 form an antenna portion. The antenna portion may be installed outdoors, for example, inside a radome or the like. The receiving unit 116 may be installed at a location away from the antenna unit, for example, indoors. The synthesizer 112 and the receiver 116 are connected to each other via a cable 115. The directional coupler 113 inputs a pilot signal to the analog radar reception signal in front of the cable 115. The directional coupler 114 inputs a pilot signal to the analog radar reception signal at the subsequent stage of the cable 115. The pilot signal is distributed corresponding to the analog radar reception signals of a plurality of channels using a switch and a distributor (not shown), and is input to the analog radar reception signals using the directional couplers 113 and 114.

The receiving unit 116 receives the analog radar reception signal output by the synthesizer 112 via the directional couplers 113 and 114 and the cable 115. The receiving unit 116 has a function of converting an analog radar reception signal into a digital radar reception signal. The receiving unit 116, for example, has a function of down-converting the frequency from RF to the baseband, performs I and Q detection on the analog radar received signal, and outputs an I and Q digital signal (digital radar received signal). Has a function. The receiving unit 116 corresponds to the receiving unit 13 of FIG.

The signal processing unit 117 performs signal processing including digital beamforming on the digital radar received signal. The signal processing unit 117 generates a target signal representing a target included in the analog radar reception signal from the digital radar reception signal. At the time of the test, the signal processing unit 117 generates a target signal representing a pseudo target included in the pilot signal from the digital radar received signal. The display unit 118 includes a display device such as a liquid crystal display device. The display unit 118 visually displays the target object included in the target signal to the user. The signal processing unit 117 corresponds to the signal processing unit 14 of FIG. 1, and the display unit 118 corresponds to the display unit 15 of FIG.

The control unit 119 controls each unit of the radar device 100. For example, the control unit 119 causes the signal switching unit 102 to output the excitation signal generated by the excitation unit 101 to the distributor 103 at the time of radar transmission. At the time of the test, the control unit 119 notifies the excitation unit 101 of data (information) such as the distance and direction of the pseudo target used for generating the pilot signal, and causes the excitation unit 101 to generate the pilot signal. The excitation unit 101 generates a pilot signal based on the data received from the control unit 119. When the pilot signal is input to the analog radar reception signal by using the directional coupler 121 of the reception module 111, the excitation unit 101 generates a pilot signal corresponding to the signal output by the antenna element 120. When the pilot signal is input to the analog radar reception signal using the directional coupler 113 or 114, the excitation unit 101 generates a pilot signal corresponding to the signal output by the synthesizer 112. At the time of the test, the control unit 119 causes the signal switching unit 102 to output the pilot signal generated by the excitation unit 101 to any of the receiving module 111, the directional coupler 113, and the directional coupler 114.

A part of the functions of each part in the radar device 100, for example, at least a part of the functions of the signal processing unit 117 and the control unit 119 is a semiconductor processing device such as an ASIC (Application Specific Integrated Circuit) or an FPGA (field-). It may be realized by using a programmable device such as programmable gate array). Further, those functions may be realized by having a computer including at least one processor (e.g. microprocessor, Micro Processing Unit (MPU), Central Processing Unit (CPU)) execute the program.

Next, the operation procedure (radar test method) at the time of the test in the radar device 100 will be described. The radar device 100 performs normal radar transmission and radar reception operations. The control unit 119 causes the excitation unit 101 to generate a pilot signal corresponding to the pseudo target during the reception time of the PRT. The pilot signal is input to the analog radar reception signal at the directional coupler 121, the directional coupler 113, or the directional coupler 114 of the receiving module 111. The signal processing unit 117 performs various processes including digital beamforming processing on the analog radar received signal to which the pilot signal is input. The display unit 118 displays the target signal generated by the signal processing unit 117 on the radar monitoring screen, and displays the actual target and the pseudo target on the display screen.

FIG. 4 shows a specific example of the radar monitoring screen. In FIG. 4, the center of the circle represents the radar site, that is, the place where the transmitting module 104 and the receiving module 111 are arranged. The white triangles represent the actual target (aircraft). The black square represents a pseudo goal. In FIG. 4, the dashed arrows represent the routes of the vacant aircraft and the pseudo-targets. The user observes such a radar monitoring screen and monitors the vacant aircraft. Further, the user determines whether or not the radar device 100 is operating normally by monitoring whether or not the pseudo target is displayed at the intended position and density on the radar monitoring screen. The figures and the like shown on the radar monitoring screen of FIG. 4 are examples for facilitating the explanation, and the figures and the like actually displayed on the radar monitoring screen are not limited to these.

In the present embodiment, the excitation unit 101 generates a pilot signal that imitates a reflection signal from the pseudo target in addition to the excitation signal transmitted by the radar. The pilot signal is input to the analog radar reception signal using the directional coupler 121, the directional coupler 113, or the directional coupler 114 in the receiving module 111. The pilot signal has the same specifications as the high-frequency signal used for radar transmission and is synchronized with the high-frequency signal. Therefore, the pilot signal can be processed by the signal processing unit 117 as a pseudo target signal, such as digital beam forming processing, in the same manner as the analog radar reception signal received by the antenna element of the receiving module 111. In this embodiment, it is possible to output a pseudo target of an arbitrary distance, direction, and altitude, and it is possible to immediately check various signal processing functions online (during radar transmission / reception).

In the present embodiment, the pilot signal can be input to the analog radar reception signal at the reception module 111, the rear stage of the antenna unit (synthesizer 112), and the front stage of the reception unit 116. For example, when the pilot signal is input to the analog radar reception signal in the directional coupler 121 of the reception module 111, it is assumed that the pseudo target is not displayed at the intended position and density. In that case, in the analog stage, it can be determined that a problem has occurred in any of the amplifier 122 of the receiving module 111, the phase device 123, and the cable 115 connecting the receiving module 111 and the receiving unit 116. In that case, the user changes the position where the pilot signal is input to the directional coupler 113. Suppose that after the input position of the pilot signal is changed, the pseudo target is displayed at the intended position density. In that case, there is no problem in the circuit after the cable 115, and it can be determined that a problem has occurred in the receiving module 111.

If the pseudo target is not displayed at the intended position or density even after the input position of the pilot signal is changed, the user changes the position where the pilot signal is input to the directional coupler 114. In that case, if the pseudo target is displayed at the intended position and density, it can be determined that there is no problem in the circuit after the directional coupler 114 and there is a problem in the receiving module 111 or the cable 115. In the present embodiment, the radar device 100 is configured to be capable of inputting pilot signals at two or more locations with respect to the analog radar reception signal. In the present embodiment, when the pseudo target is not displayed at the intended position or density, the position where the pilot signal is input can be changed to determine which part of the radar device 100 has a defect. Evaluation is possible.

In the radar device 100, NF (Noise Factor) is a major factor that determines the reception performance. The main factor of NF is the noise level in the front stage of the receiving unit 116 (from the receiving module 111 to the input stage of the receiving unit 116). In particular, the amplifier of the received signal in the receiving module 111 is a main factor of NF. In the present embodiment, the system operation can be evaluated while the receiving module 111 to the receiving unit 116 are physically connected. In the present embodiment, since the noise level does not change between online and during the test, the accuracy of system operation evaluation can be improved.

In the radar device 100, the receiving unit 116 and the exciting unit 101 use the same LOCAL signal. The receiving unit 116 can satisfy the target detection performance by down-converting the reflected signal from the target using the same LOCAL signal. Fluctuations in the phase shift, voltage level, and noise level of the LOCAL signal lead to deterioration of the target detection performance. In the present embodiment, the excitation unit 101 generates a signal equivalent to the RF signal transmitted by the radar as a pilot signal, and such a pilot signal is input to the analog radar reception signal. Therefore, in this embodiment, it is possible to suppress the deterioration of the target detection performance due to the phase shift of the LOCAL signal, the fluctuation of the voltage level, and the noise level.

Subsequently, the second embodiment of the present disclosure will be described. FIG. 5 shows a radar device according to a second embodiment of the present disclosure. The radar device 100 in the present disclosure has an external antenna 130 in addition to the components of the radar device 100 according to the first embodiment shown in FIG. In the present embodiment, the signal switching unit 102 can supply the pilot signal to the external antenna 130. Other points may be the same as in the first embodiment.

The external antenna 130 is fixed, for example, in a predetermined positional relationship. The external antenna 130 and the receiving module 111 face each other with a predetermined distance. The external antenna 130 is arranged so as to face the center of the receiving module 111, for example. The external antenna 130 transmits a pilot signal input from the signal switching unit 102 to the receiving module 111. The pilot signal transmitted by the external antenna 130 is input to the signal path of the analog radar reception signal in the reception module 111. The distance between the external antenna 130 and the receiving module 111 is determined so that the pilot signal is received in the receiving module 111 in the same phase. When the external antenna 130 is used, the position of the pseudo target can be controlled in elevation angle, direction, distance, and the like.

In the present embodiment, the pilot signal is input from the external antenna 130 to the receiving module 111. In this case, the pilot signal can be directly input to each antenna element of the receiving module 111. Therefore, it is possible to check the operation of all channels of the analog radar reception signal and all reception systems. Other effects are the same as in the first embodiment.

When the external antenna 130 is used, a spatial path error may occur in the pilot signal received by each antenna element of the receiving module 111. When a spatial path error occurs, it is preferable to correct the spatial error between the receiving module 111 and the signal processing unit 117.

Subsequently, the third embodiment of the present disclosure will be described. The configuration of the radar device according to the present embodiment is the same as the configuration of the radar device 100 according to the first embodiment shown in FIG. Alternatively, the configuration of the radar device according to the present embodiment may be the same as the configuration of the radar device 100a according to the first embodiment shown in FIG.

In the present embodiment, the control unit 119 outputs a digital test signal to the signal processing unit 117. The digital test signal is a signal that imitates a digital radar reception signal assuming a pseudo target. The digital test signal corresponds to a digital radar reception signal generated by processing the analog radar reception signal from the pseudo target by the receiving unit 116.

In the present embodiment, the signal processing unit 117 performs processing such as digital beamforming processing on the analog radar reception signal to which the pilot signal is input and the digital test signal. The target signal generated by the signal processing unit 117 includes a pseudo target included in the pilot signal and a pseudo target included in the digital test signal.

FIG. 6 shows a specific example of the radar monitoring screen. In FIG. 6, the center of the circle represents the radar site, the white triangle represents the vacant aircraft, and the black square represents the pseudo target corresponding to the pilot signal. The black circle represents a pseudo target corresponding to the digital test signal. In FIG. 6, the dashed arrow represents the route of the vacant aircraft and the pseudo-target. The user determines whether or not the radar device 100 is operating normally by monitoring whether or not the pseudo target is displayed at the intended position on the radar monitoring screen. At this time, if the position of the pseudo target corresponding to the pilot signal is incorrect, or if the position of the pseudo target corresponding to the digital test signal is correct, the user can determine that there is a problem somewhere up to the receiving unit 116. The figures and the like shown on the radar monitoring screen of FIG. 6 are examples for facilitating the explanation, and the figures and the like actually displayed on the radar monitoring screen are not limited to these.

In this embodiment, a digital test signal that imitates a digital radar reception signal when a pseudo target is assumed is used. By using the digital test signal, it is possible to determine whether the radar device 100 has a defect in the digital signal region or a defect in the analog signal region. Other effects are similar to those of the first or second embodiment.

In each of the above embodiments, an example in which a pilot signal is input to an analog radar reception signal at both ends of the reception module 111 and the cable 115 has been described, but the present disclosure is not limited thereto. In the radar device 100, the pilot signal may be input at at least two locations between the receiving module 111 and the preceding stage of the receiving unit 116. For example, in the first embodiment, the directional coupler 113 may be omitted, and the directional coupler 121 and the directional coupler 114 of the receiving module 111 may be used to input a pilot signal to the analog radar reception signal. .. Further, in the second embodiment, the directional coupler 121 and the directional coupler 113 of the receiving module 111 are omitted, and the external antenna 130 and the directional coupler 114 are used to input a pilot signal to the analog radar reception signal. You may enter it.

Although the embodiments of the present disclosure have been described in detail above, the present disclosure is not limited to the above-described embodiments, and changes and modifications are made to the above-described embodiments without departing from the spirit of the present disclosure. Are also included in this disclosure.

10: Radar device 11: Transmission module 12: Reception module 13: Reception unit 14: Signal processing unit 15: Display unit 16: Excitation unit 17: Signal switching unit 100: Radar device 101: Excitation unit 102: Signal switching unit 103: Distribution Device 104: Transmitter module 111: Received module 112: Combiner 113, 114, 121: Directional coupler 115: Cable 116: Received unit 117: Signal processing unit 118: Display unit 119: Control unit 120: Antenna element 122: Amplifier 123: Phaser 130: External antenna

Claims (8)

A transmission module that includes multiple transmitting antenna elements,
A receiving module that includes multiple receiving antenna elements,
A receiver that converts a plurality of analog radar reception signals received using the plurality of reception antenna elements into a plurality of digital radar reception signals, and a receiver.
A signal processing unit that performs digital beamforming processing on the plurality of digital reception signals and generates a target signal representing a target included in the analog radar reception signal.
A display unit that displays the target signal and
An excitation signal transmitted from the transmitting antenna element, an excitation unit that generates a pilot signal that imitates an analog radar reception signal when a pseudo target is assumed, and an excitation unit.
At the time of radar transmission, the excitation signal generated by the excitation unit is supplied to the transmission module, and at the time of testing, the analog radar reception signal is selectively selected at two or more points from the reception module to the input end of the reception unit. A radar device including a signal switching unit for inputting the pilot signal. The radar device according to claim 1, wherein the signal switching unit inputs the pilot signal to the analog radar reception signal via a directional coupler. The radar device according to claim 1 or 2, wherein the signal switching unit inputs the pilot signal to the analog radar reception signal by causing the receiving antenna element to receive the pilot signal using an external antenna. The radar device according to any one of claims 1 to 3, wherein the pilot signal is distributed by the number of the plurality of analog radar reception signals and input to each analog radar reception signal. The radar device according to any one of claims 1 to 4, further comprising a control unit for inputting a digital test signal imitating a digital radar reception signal assuming a pseudo target to the signal processing unit. The analog radar reception signal is input to the receiving unit via a cable, and the analog radar reception signal is input to the receiving unit.
The radar device according to any one of claims 1 to 5, wherein the signal switching unit inputs the pilot signal to the analog radar reception signal at at least one of the front and rear of the cable. The receiving module includes an amplifier that amplifies the analog radar received signal and a phase device that controls the phase of the analog radar received signal.
The radar device according to any one of claims 1 to 6, wherein the signal switching unit inputs the pilot signal to the analog radar reception signal in the previous stage of the amplifier. Assuming a pseudo target, the reflected signal of the excitation signal transmitted from the transmitting antenna is generated as a pilot signal that imitates the analog radar reception signal received by the receiving antenna element.
The pilot signal is selectively input to the analog radar reception signal at two or more points in the signal path of the analog radar reception signal.
Converting the analog radar reception signal into a plurality of digital radar reception signals,
Digital beamforming processing is performed on the plurality of digital received signals to generate a target signal representing a target included in the analog radar received signal.
A radar test method comprising displaying the target signal.

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