JP2013160508A - Radar device evaluation system and radar device evaluation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately evaluate a radar device.SOLUTION: A radar device evaluation system comprises a simulation signal generation section, a D/A conversion section, a drive clock generation section, an acquisition section and a frequency setting section. The simulation signal generation section generates a simulation signal relating to a reflection wave on the basis of information about a transmission wave that a radar device of an evaluation object transmits and information about a target. The D/A conversion section converts such a simulation signal from a digital signal to an analog signal, and the drive clock generation section generates a drive clock in the case where conversion processing is performed in the D/A conversion section. The acquisition section acquires a first frequency that is a sampling frequency in the case when the radar signal that has received the simulation signal converted by the D/A conversion section converts the simulation signal from the analog signal to the digital signal. The frequency setting section sets a second frequency, as a frequency of the drive clock generated by the drive clock generation section, so as to be settled within a predetermined range from a frequency obtained by integer-multiplying the first frequency acquired by the acquisition section.

Description

  Embodiments disclosed herein relate to a radar apparatus evaluation system and a radar apparatus evaluation method.

  Conventionally, when evaluating a radar apparatus, a radar apparatus evaluation system for generating a waveform signal for evaluation by a simulator and evaluating whether or not the position and speed of a target can be accurately analyzed by the radar apparatus is known. ing.

  For example, Patent Document 1 proposes an evaluation system in which a simulator creates a reflected wave to a radar device based on flight data such as the position and speed of an aircraft and evaluates the performance of the aircraft radar device.

Japanese Utility Model Publication No. 5-59370

  However, according to the above-described conventional technology, there is a problem in that when a frequency analysis is performed based on the waveform signal for evaluation generated by the simulator, an unnecessary peak is included in the level subjected to the frequency analysis.

  For this reason, when the radar apparatus analyzes the target based on the waveform signal, the target is erroneously recognized, and thus the above-described conventional evaluation system cannot perform accurate evaluation. It was.

  One aspect of the embodiments has been made in view of the above, and an object thereof is to provide a radar apparatus evaluation system and a radar apparatus evaluation method capable of accurately evaluating a radar apparatus.

  A radar apparatus evaluation system according to an aspect of an embodiment includes a simulation signal generation unit, a DA conversion unit, a drive clock generation unit, an acquisition unit, and a frequency setting unit. The simulated signal generation unit generates a simulated signal related to the reflected wave based on the information related to the transmission wave transmitted by the radar device to be evaluated and the information related to the target. The DA conversion unit converts the simulation signal generated by the simulation signal generation unit from a digital signal to an analog signal, and the drive clock generation unit generates a drive clock when the DA conversion unit performs conversion processing. . The acquisition unit receives the first frequency which is a sampling frequency when the radar device that has received the simulation signal converted by the DA conversion unit converts the simulation signal from an analog signal into a digital signal. Get from outside. The frequency setting unit sets the second frequency as the frequency of the drive clock generated by the drive clock generation unit so as to be within a predetermined range from a frequency obtained by multiplying the first frequency acquired by the acquisition unit by an integer. Set.

  According to one aspect of the embodiment, the radar apparatus can be accurately evaluated.

FIG. 1 is an explanatory diagram of a radar apparatus evaluation system according to the first embodiment. FIG. 2 is a block diagram showing the configuration of the radar apparatus evaluation system according to the first embodiment. FIG. 3 is a first diagram illustrating an example of a frequency analysis result. FIG. 4 is a second diagram illustrating an example of the frequency analysis result. FIG. 5 is a third diagram illustrating an example of the frequency analysis result. FIG. 6 is a flowchart showing a processing procedure of initial processing according to the first embodiment. FIG. 7 is a flowchart showing a processing procedure of BEAT signal output processing according to the first embodiment. FIG. 8 is a block diagram showing a configuration of a radar apparatus evaluation system according to the second embodiment. FIG. 9 is a block diagram showing a configuration of a radar apparatus evaluation system according to the third embodiment.

  Hereinafter, embodiments of a radar apparatus evaluation system and a radar apparatus evaluation method disclosed in the present application will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited by embodiment shown below.

(First embodiment)
First, the radar apparatus evaluation system according to the first embodiment will be described with reference to FIG. FIG. 1 is an explanatory diagram of a radar apparatus evaluation system according to the first embodiment. In FIG. 1, a part of the shape is simplified for easy explanation.

  As shown in FIG. 1, the radar apparatus evaluation system according to the first embodiment includes a signal generation apparatus 10 and an evaluation apparatus 20. The radar device 30 is a device to be evaluated.

  When evaluating the radar device 30, the radar device evaluation system generates a simulation signal for evaluation (hereinafter referred to as “evaluation signal”) by the signal generation device 10, and the evaluation device 20 uses the radar device 30. It is evaluated whether or not the target analysis process to be executed is accurately processed.

  Specifically, the signal generation device 10 generates a digital evaluation signal (hereinafter referred to as “digital evaluation signal”) that reflects the target based on target motion information stored in advance. Further, the signal generation device 10 performs DA (Digital Analog) conversion of the generated digital evaluation signal into an analog evaluation signal (hereinafter referred to as “analog evaluation signal”).

  Then, the evaluation device 20 outputs an analog evaluation signal to the radar device 30, and the radar device 30 receives the analog evaluation signal, and AD (Analog Digital) converts the received analog evaluation signal into a digital evaluation signal.

  Further, the radar device 30 analyzes the position and speed of the target by performing frequency analysis on the AD-converted digital evaluation signal, and transmits the analysis result to the evaluation device 20. On the other hand, the evaluation device 20 outputs the received analysis result to a display unit or the like.

  Here, in the conventional radar apparatus evaluation system, when the sampling frequency at the time of DA conversion is different from the sampling frequency at the time of AD conversion, the frequency analyzed level is obtained when frequency analysis is performed based on the evaluation digital evaluation signal. Contains unnecessary peaks.

  For this reason, when the sampling frequency at the time of DA conversion differs from the sampling frequency at the time of AD conversion, the radar apparatus 30 may misrecognize a noise part as a target, and cannot obtain an accurate evaluation result. .

  Therefore, in the radar apparatus evaluation system according to the first embodiment, the signal generation apparatus 10 performs DA conversion based on the sampling frequency when the radar apparatus 30 performs AD conversion. Details of the DA conversion process will be described later with reference to FIG.

  Thereby, in the radar apparatus evaluation system according to the first embodiment, when the generated digital evaluation signal is DA-converted into an analog evaluation signal, the radar apparatus is accurately evaluated by converting the digital evaluation signal so as not to include a noise component. It can be carried out.

  Next, details of the configuration of the radar apparatus evaluation system according to the first embodiment will be described with reference to FIG. FIG. 2 is a block diagram showing the configuration of the radar apparatus evaluation system according to the first embodiment.

  The radar apparatus evaluation system according to the first embodiment includes a signal generation apparatus 10 and an evaluation apparatus 20, and the evaluation apparatus 20 is connected to a radar apparatus 30 that is an evaluation target.

  First, the radar device 30 to be evaluated will be described. Here, the case where the radar apparatus 30 is an FMCW (Frequency Modulation Continuous Wave) radar will be described.

  The FMCW radar is a device that transmits a frequency-modulated continuous wave and obtains the distance of the target from the frequency difference between the transmitted wave and the reflected wave (hereinafter referred to as “BEAT frequency”).

  Usually, an FMCW radar mounted on a moving object such as a vehicle generates a BEAT signal by mixing a transmission wave transmitted from a transmission antenna and a reflected wave received by a reception antenna, and AD converts the generated BEAT signal .

  The FMCW radar analyzes the position of the target by performing frequency analysis of the AD-converted digital signal. However, in the radar apparatus evaluation system according to the first embodiment, the radar apparatus 30 receives the evaluation BEAT signal generated by the signal generation apparatus 10 and performs target analysis.

  Thereafter, in the radar apparatus evaluation system according to the first embodiment, it is evaluated whether the target analysis process executed by the radar apparatus 30 has been accurately performed. Therefore, the radar apparatus 30 does not require a transmission / reception antenna and a mixer that generates a BEAT signal.

  Returning to the description of the radar apparatus 30, the description of the configuration of the radar apparatus 30 will be continued. The radar apparatus 30 includes an AD conversion unit 31, an FFT calculation unit 32, and a target analysis unit 33.

  The AD conversion unit 31 receives the analog BEAT signal for evaluation generated by the signal generation device 10 via the evaluation device 20 and performs AD conversion at a predetermined sampling frequency (hereinafter referred to as “analysis frequency”). Then, the converted digital BEAT signal is passed to the FFT operation unit 32.

  The FFT operation unit 32 is a processing unit that performs frequency analysis on the digital BEAT signal converted by the AD conversion unit 31 using a DSP (Digital Signal Processor) circuit. Specifically, the FFT operation unit 32 decomposes the digital BEAT signal into levels for each frequency by performing a fast Fourier transform (FFT).

  The target analysis unit 33 determines whether or not the target is based on the level subjected to the FFT conversion by the FFT calculation unit 32, and calculates the position of the target when it is determined that the target is the target. Is a processing unit.

  Specifically, the target analysis unit 33 determines that the target is a target when the peak included in the level analyzed by the FFT calculation unit 32 is equal to or higher than a predetermined threshold. The peak is the highest level in a specific frequency range.

  When the target analysis unit 33 determines that the target is the target, the target analysis unit 33 calculates the distance from the target, that is, the position of the target from the BEAT frequency. Since the calculation of the distance from the target from the BEAT frequency is a known technique, the description is omitted. The target analysis unit 33 also performs processing for passing the calculated analysis result to the result output unit 24.

  Next, the signal generation device 10 will be described. The signal generation device 10 includes a target motion information setting unit 11, a BEAT signal calculation unit 12, a BEAT signal generation unit 13, a DA conversion unit 14, a generation frequency determination unit 15, and a generation frequency setting unit 16. And a storage unit 17.

  The memory | storage part 17 is a memory | storage part comprised with memory | storage devices, such as RAM (Random Access Memory) and a non-volatile memory. The storage unit 17 stores target movement information 17a. The target motion information 17a stores information including conditions such as speed and position of the target necessary for generating an evaluation signal reflecting the target.

  The target motion information setting unit 11 sets a motion information pattern (hereinafter referred to as “motion pattern”) for each target based on the target motion information 17 a and performs processing to pass to the BEAT signal calculation unit 12. It is a processing unit. The target motion information setting unit 11 also creates information corresponding to the anomaly pattern, such as the timing at which reception failure of the reception antenna of the FMCW radar occurs, and also performs processing to be passed to the BEAT signal calculation unit 12.

  The BEAT signal calculation unit 12 calculates a distance, a relative speed, an azimuth angle, a reflected wave intensity, and the like with respect to the radar device 30 for each movement pattern based on the movement information of the target received from the target movement information setting unit 11. It is a processing unit that performs processing to be passed to the signal generation unit 13.

  Further, the BEAT signal calculation unit 12 calculates BEAT signal information such as BEAT frequency and amplitude for each motion pattern and each target based on the calculated distance, relative speed, and the like, and passes the processing to the BEAT signal generation unit 13. Do it.

  Note that the BEAT signal calculation unit 12 may be configured by a hardware in the loop (HIL) test system. The HIL test system is a test system that includes a driver, a vehicle, and a traveling environment, and performs a simulation necessary for the operation of an ECU (Engine Control Unit) using evaluation data.

  The BEAT signal generator 13 generates a digital BEAT signal to be output from the timing signal transmitter 21 in accordance with a predetermined timing signal, and passes it to the DA converter 14.

  Specifically, when receiving a transmission timing signal indicating a BEAT signal output instruction from the timing signal transmission unit 21, the BEAT signal generation unit 13 generates a digital BEAT signal of a target to be output based on the BEAT signal information. To do.

  Then, the BEAT signal generation unit 13 combines the generated digital BEAT signal with the target to be output, and passes the combined digital BEAT signal to the DA conversion unit 14.

  Also, when receiving the frequency modulation timing signal, the BEAT signal generation unit 13 generates a digital evaluation signal in which the frequency of the digital BEAT signal is changed according to the amplitude of the signal wave, and passes the digital evaluation signal to the DA conversion unit 14.

  The DA converter 14 DA-converts the digital BEAT signal received from the BEAT signal generator 13 based on the sampling frequency set by the generation frequency setting unit 16 (hereinafter referred to as “generation frequency”). Then, the DA conversion unit 14 passes the analog BEAT signal obtained by DA conversion to the BEAT signal output unit 22.

  The BEAT signal generation unit 13 and the DA conversion unit 14 may be configured by an FPGA (Field Programmable Gate Array). An FPGA is an integrated circuit whose configuration can be set by a user after manufacturing.

  The generation frequency determination unit 15 is a processing unit that performs a process of determining a generation frequency that is a sampling frequency when performing DA conversion based on the analysis frequency received from the analysis frequency acquisition unit 23.

  Here, details of the generation frequency determination method executed by the generation frequency determination unit 15 will be described with reference to FIGS. 3 to 5 are diagrams illustrating examples of frequency analysis results.

  First, the case where the analysis frequency, which is a sampling frequency when AD conversion is performed by the AD conversion unit 31, and the generation frequency, which is a sampling frequency when DA conversion is performed by the DA conversion unit 14, will be described.

  In this case, as shown in FIG. 3, the level for each frequency of the evaluation signal subjected to frequency analysis by the FFT calculation unit 32 includes not only a target peak indicating a target but also an unnecessary peak indicating noise.

  Here, the target analysis unit 33 determines that the target is a target when the peak included in the level for each frequency subjected to frequency analysis is equal to or greater than a predetermined threshold. Therefore, if noise is included in the digital BEAT signal generated by the BEAT signal generation unit 13, the target analysis unit 33 erroneously determines that an unnecessary peak indicating noise is a target.

  Therefore, the generation frequency determination unit 15 determines the generation frequency so as to be an integral multiple of the analysis frequency. For example, when the generation frequency is twice the analysis frequency, as shown in FIG. 4, the level for each frequency subjected to frequency analysis includes only the target peak indicating the target, and no noise is required. Does not include peaks.

  Although the generation frequency is determined to be an integer multiple of the analysis frequency, the generation frequency is not limited to this. For example, the generation frequency determination unit 15 may determine the generation frequency so as to be within a predetermined range from a frequency obtained by multiplying the analysis frequency by an integer.

  For example, as shown in FIG. 5, when the generation frequency is 2.003 times the analysis frequency, the unnecessary peak indicating noise is equal to or less than a predetermined threshold. From this, the generation frequency determination unit 15 may determine the generation frequency so that an unnecessary peak included in the frequency-analyzed level is equal to or less than a predetermined threshold.

  As described above, the generation frequency determination unit 15 determines the generation frequency so that an unnecessary peak indicating noise included in the level of the evaluation signal subjected to frequency analysis is not determined to be a target. Thereby, in the radar apparatus evaluation system according to the first embodiment, the radar apparatus can be accurately evaluated.

  Returning to the description of FIG. 2, the description of the configuration of the signal generation device 10 is continued. The generation frequency setting unit 16 is a processing unit that performs a process of setting the generation frequency determined by the generation frequency determination unit 15 as a sampling frequency when DA conversion is performed by the DA conversion unit 14.

  The generation frequency setting unit 16 is set when the generation frequency and the sampling frequency are different. However, the generation frequency is not limited to this, and the generation frequency is changed when the radar device 30 to be evaluated is changed. It is good also as setting.

  Next, the evaluation device 20 will be described. The evaluation device 20 includes a timing signal transmission unit 21, a BEAT signal output unit 22, an analysis frequency acquisition unit 23, a result output unit 24, and a display unit 25.

  The timing signal transmission unit 21 is a processing unit that performs a process of notifying the BEAT signal generation unit 13 of a timing for outputting a BEAT signal of a predetermined target based on an evaluation plan (not shown) stored in the evaluation device 20. is there.

  Specifically, the timing signal transmission unit 21 transmits a transmission timing signal indicating the output timing of the BEAT signal to the BEAT signal generation unit 13. The transmission timing signal includes information such as the distance of the target, the relative speed, the azimuth angle, and the level of the reflected wave with respect to the radar device 30. The evaluation plan is a scenario created in advance when the radar apparatus 30 is evaluated, and stores the position and speed of the target in accordance with the time.

  The timing signal transmission unit 21 also outputs a transmission antenna switching signal that is a notification of switching the transmission antenna of the radar apparatus 30 and a frequency modulation timing signal that is an instruction to change the frequency of the evaluation signal according to the amplitude of the signal wave. It transmits to the production | generation part 13.

  Note that the timing signal transmission unit 21 also performs a process of transmitting to the BEAT signal generation unit 13 a signal instructing to generate and output a signal on which noise is superimposed based on the evaluation plan corresponding to the irregular pattern. .

  The BEAT signal output unit 22 is a processing unit that performs a process of receiving the analog BEAT signal converted by the DA conversion unit 14 and outputting the analog BEAT signal to the AD conversion unit 31.

  The analysis-time frequency acquisition unit 23 is a processing unit that performs a process of acquiring an analysis-time frequency that is a sampling frequency when the radar apparatus 30 performs AD conversion from the AD conversion unit 31 and passing it to the generation-time frequency determination unit 15.

  The result output unit 24 is a processing unit that performs a process of receiving the analysis result calculated by the target analysis unit 33 and displaying it on the display unit 25. Here, the result output unit 24 displays the analysis result on the display unit 25. However, the result output unit 24 compares the result with an evaluation plan (not shown) stored in the evaluation device 20 and evaluates the result. You may display on the display part 25. FIG.

  The display unit 25 is a display device provided in the evaluation device 20 that displays the analysis result, and includes, for example, a liquid crystal display and a speaker.

  As described above, the radar apparatus evaluation system according to the first embodiment does not need to evaluate the target analysis processing executed by the target analysis unit 33 by actually mounting the radar apparatus 30 on the vehicle, and is capable of transmitting and receiving antennas. There is also no need to mount a mixer that generates a BEAT signal. Therefore, in the radar apparatus evaluation system according to the first embodiment, the cost for evaluation can be reduced.

  Although the evaluation device 20 and the radar device 30 are separated from each other here, it is not necessary to mount a transmission / reception antenna. Therefore, the evaluation device 20 includes a microcomputer including a target analysis function executed by the radar device 30. It is good also as mounting in. Further, although the signal generation device 10 and the evaluation device 20 are separated from each other, a configuration in which one device is used may be employed.

  Next, a processing procedure of initial processing executed by the radar apparatus evaluation system according to the first embodiment will be described with reference to FIG. This initial process is a process performed before the BEAT signal output process is executed. FIG. 6 is a flowchart showing a processing procedure of initial processing according to the first embodiment.

  As shown in FIG. 6, the target motion information setting unit 11 acquires the target motion information 17a (step S101), and sets motion information patterns of a plurality of targets based on the target motion information 17a ( Step S102).

  Then, the BEAT signal calculation unit 12 calculates position and relative velocity information for the radar device 30 for each movement pattern based on the movement information of the target set by the target movement information setting unit 11 (step S103).

  Subsequently, the BEAT signal calculation unit 12 calculates BEAT signal information including the BEAT frequency and amplitude for each target based on the calculated position and relative velocity information (step S104).

  Further, the generation frequency determination unit 15 acquires the analysis time frequency from the analysis time frequency acquisition unit 23 (step S105), and determines a generation time frequency that is a sampling frequency when performing DA conversion based on the acquired analysis time frequency. (Step S106).

  Then, the generation frequency setting unit 16 sets the generation frequency determined by the generation frequency determination unit 15 as a sampling frequency for DA conversion by the DA conversion unit 14 (step S107), and ends a series of initial processing. To do.

  The processing from step S101 to step S104 is performed as an initial process. However, when the transmission timing signal is received from the timing signal transmission unit 21, the BEAT signal information of the target to be output is calculated. Good.

  Next, a processing procedure of BEAT signal output processing executed by the radar apparatus evaluation system according to the first embodiment will be described with reference to FIG. FIG. 7 is a flowchart showing a processing procedure of BEAT signal output processing according to the first embodiment.

  As illustrated in FIG. 7, the timing signal transmission unit 21 determines whether it is the output timing of the BEAT signal based on the evaluation plan (step S201).

  When the timing signal transmission unit 21 determines that it is the output timing of the BEAT signal (Yes in step S201), the timing signal transmission unit 21 transmits the transmission timing signal to the BEAT signal generation unit 13 (step S202).

  Further, when receiving the transmission timing signal from the timing signal transmission unit 21, the BEAT signal generation unit 13 generates a digital BEAT signal for the target based on the BEAT signal information calculated by the BEAT signal calculation unit 12, Combine (step S203).

  Then, the DA conversion unit 14 DA-converts the digital BEAT signal received from the BEAT signal generation unit 13 with the generation frequency set by the generation frequency setting unit 16 (step S204).

  The BEAT signal output unit 22 outputs the analog BEAT signal DA-converted by the DA conversion unit 14 to the radar device 30 that is an evaluated device (step S205), and the BEAT signal generation unit 13 performs the determination process of step S201. repeat.

  On the other hand, when it is determined in step S201 that the timing signal transmission unit 21 is not at the output timing of the BEAT signal (No in step S201), the result output unit 24 determines whether the analysis result is acquired from the target analysis unit 33 or not. Determination is made (step S206).

  In the result output unit 24, when the analysis result is acquired from the target analysis unit 33 (Yes in step S206), the analysis result is displayed on the display unit 25 (step S207), and the determination process in step S201 is repeated.

  Moreover, in the result output part 24, when the analysis result is not acquired from the target analysis part 33 (step S206, No), the determination process of step S201 is repeated.

  As described above, in the radar apparatus evaluation system and the radar apparatus evaluation method according to the first embodiment, the sampling frequency for DA conversion is determined based on the sampling frequency when the radar apparatus performs AD conversion, and the DA conversion unit It was decided to set automatically. Thereby, in the radar apparatus evaluation system and the radar apparatus evaluation method according to the first embodiment, the radar apparatus can be accurately evaluated.

(Second Embodiment)
Next, a radar apparatus evaluation system and a radar apparatus evaluation method according to the second embodiment will be described with reference to FIG. FIG. 8 is a block diagram showing a configuration of a radar apparatus evaluation system according to the second embodiment.

  In the radar apparatus evaluation system according to the second embodiment, when the generation frequency determined by the generation frequency determination unit 15 is different from the sampling frequency at the time of DA conversion, the fact that the fact is notified is the first implementation. This is different from the radar apparatus evaluation system of the embodiment.

  In addition, about the same structure, it attaches | subjects the same code | symbol and abbreviate | omits the description of the overlapping structure and operation | movement.

  Similar to the first embodiment, the generation frequency determination unit 15 determines a generation frequency that is a sampling frequency when performing DA conversion based on the analysis frequency received from the analysis frequency acquisition unit 23.

  The generation frequency notification unit 18 included in the signal generation device 10 ′ notifies that when the generation frequency determined by the generation frequency determination unit 15 is different from the sampling frequency when DA conversion is performed by the DA conversion unit 14. To do.

  For example, the generation frequency notification unit 18 displays on the display unit (not shown) provided in the signal generation device 10 ′ that the sampling frequency when DA conversion is performed by the DA conversion unit 14 is not optimal.

  Thereby, the sampling frequency when DA conversion is performed by the DA conversion unit 14 by the user can be set to the generation frequency determined by the generation frequency determination unit 15. Therefore, in the radar apparatus evaluation system according to the second embodiment, a digital evaluation signal that does not include noise can be provided to the radar apparatus 30.

  As described above, in the radar apparatus evaluation system and the radar apparatus evaluation method according to the second embodiment, the radar apparatus determines and notifies the sampling frequency for DA conversion based on the sampling frequency when the radar apparatus performs AD conversion. It was. Thereby, in the radar apparatus evaluation system and the radar apparatus evaluation method according to the second embodiment, the radar apparatus can be accurately evaluated.

(Third embodiment)
Next, a radar apparatus evaluation system and a radar apparatus evaluation method according to the third embodiment will be described with reference to FIG. FIG. 9 is a block diagram showing a configuration of a radar apparatus evaluation system according to the third embodiment.

  The radar apparatus evaluation system according to the third embodiment generates a BEAT signal based on the target motion information 17a that reflects a known target, and the radar apparatus 30 analyzes the BEAT signal. The radar apparatus evaluation system according to the third embodiment is different from the radar apparatus evaluation system according to the first embodiment in that the sampling frequency for DA conversion is determined based on the analysis result analyzed by the radar apparatus 30. Is different.

  In addition, about the same structure, it attaches | subjects the same code | symbol and abbreviate | omits the description of the overlapping structure and operation | movement.

  The radar apparatus evaluation system according to the third embodiment performs the following processing in order to determine the generation frequency. First, the BEAT signal generation unit 13 generates a digital BEAT signal based on the target motion information 17a reflecting a predetermined known target. For example, the BEAT signal generator 13 generates a BEAT signal when there are a plurality of stationary objects at equal intervals in the traveling direction of the vehicle.

  The DA conversion unit 14 DA converts the digital BEAT signal generated by the BEAT signal generation unit 13, and the BEAT signal output unit 22 transmits the DA-converted analog BEAT signal to the radar apparatus 30.

  On the other hand, as in the radar apparatus evaluation system according to the first embodiment, the AD conversion unit 31 performs AD conversion on the received analog BEAT signal, and the FFT operation unit 32 performs digital evaluation by AD conversion by the AD conversion unit 31. Perform frequency analysis of the signal.

  Then, the target analysis unit 33 determines whether or not the target is based on the level subjected to the FFT conversion by the FFT calculation unit 32. When the target analysis unit 33 determines that the target is the target, the target position and speed are determined. Calculate and pass the calculated analysis result to the result output unit 24a.

  The radar apparatus evaluation system according to the third embodiment then passes the analysis result received from the result output unit 24a to the generation frequency determination unit 15a. Then, the generation frequency determination unit 15a compares the target motion information 17a in which the known target is reflected and the analysis result, and determines that the generation frequency is not appropriate when both are different.

  When it is determined that the generation frequency is not appropriate, the generation frequency determining unit 15a changes the generation frequency to a predetermined value, and the generation frequency setting unit 16 converts the generated generation frequency to a DA converter. 14 is set as a sampling frequency for DA conversion.

  Thereafter, the radar apparatus evaluation system according to the third embodiment again generates a BEAT signal based on the target motion information 17a in which a predetermined known target is reflected, and the radar apparatus 30 analyzes the target. Run and compare the analysis results.

  Then, the generation frequency determination unit 15a compares the target motion information 17a reflecting the known target with the analysis result, and changes the generation frequency until the two match, and performs the above-described comparison process. repeat.

  Here, when the generation frequency and the analysis frequency are different, as shown in FIG. 3, the radar apparatus 30 outputs a result including an unnecessary peak by frequency analysis, and the unnecessary peak portion is used as a target. I will judge.

  Further, when the generation frequency is an integral multiple of the analysis frequency, as shown in FIG. 4, the radar apparatus 30 can output a result including only the target peak by frequency analysis.

  However, the target analysis unit 33 is not a target when the peak included in the level analyzed by the FFT calculation unit 32 as shown in FIG. It was decided to judge.

  Therefore, the generation frequency determination unit 15 may determine the generation frequency so that unnecessary peaks other than the target peak are equal to or less than a predetermined threshold. As a result, the generation frequency determination unit 15 determines an appropriate generation frequency so as to be within a predetermined range from a frequency obtained by multiplying the analysis frequency by an integer.

  As described above, in the radar apparatus evaluation system and the radar apparatus evaluation method according to the second embodiment, the generation frequency is determined based on the target motion information that reflects the known target. Thereby, in the radar apparatus evaluation system and the radar apparatus evaluation method according to the third embodiment, the radar apparatus can be accurately evaluated even when the analysis frequency of the radar apparatus cannot be acquired. .

  Further effects and modifications can be easily derived by those skilled in the art. Thus, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications can be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

DESCRIPTION OF SYMBOLS 10, 10a Signal generation apparatus 11 Target motion information setting part 12 BEAT signal calculation part 13 BEAT signal generation part 14 DA conversion part 15, 15a Generation frequency determination part 16 Generation frequency setting part 17 Storage part 17a Target movement information 18 Generation frequency notification unit 20, 20a Evaluation device 21 Timing signal transmission unit 22 BEAT signal output unit 23 Analysis frequency acquisition unit 24, 24a Result output unit 25 Display unit 30 Radar device 31 AD conversion unit 32 FFT calculation unit 33 Target analysis Part

Claims (8)

A radar apparatus evaluation system that generates and outputs a simulation signal related to a reflected wave of a transmission wave transmitted by the radar apparatus to a radar apparatus to be evaluated,
A simulated signal generating unit that generates a simulated signal related to a reflected wave based on information related to a transmission wave transmitted by the radar apparatus and information related to a target;
A DA converter that converts the simulated signal generated by the simulated signal generator from a digital signal to an analog signal;
A drive clock generator for generating a drive clock when performing the conversion process in the DA converter;
Receiving the simulation signal converted by the DA converter, the radar apparatus obtains a first frequency, which is a sampling frequency when the simulation signal is converted from an analog signal into a digital signal, from outside the radar apparatus evaluation system. An acquisition unit to
A frequency setting unit that sets the second frequency as the frequency of the drive clock generated by the drive clock generation unit so as to be within a predetermined range from a frequency obtained by multiplying the first frequency acquired by the acquisition unit by an integer. A radar apparatus evaluation system comprising: The simulation signal generator is
The radar apparatus evaluation system according to claim 1, wherein a BEAT signal is generated as the simulation signal. The frequency setting unit includes:
When the radar apparatus performs frequency analysis on the simulation signal, the second frequency is set so that a peak of a level value other than the level value corresponding to the target is equal to or less than a predetermined threshold value. The radar apparatus evaluation system according to claim 1 or 2. The simulation signal generator is
4. The radar apparatus evaluation system according to claim 1, wherein the process to be executed is configured by an integrated circuit that can be customized. The frequency setting unit includes:
The said 2nd frequency is set based on the level value by which the said simulation signal corresponding to a predetermined target was frequency-analyzed by the said radar apparatus, The Claim 1 characterized by the above-mentioned. Radar device evaluation system. A radar apparatus evaluation system that generates and outputs a simulation signal related to a reflected wave of a transmission wave transmitted by the radar apparatus to a radar apparatus to be evaluated,
A simulated signal generating unit that generates a simulated signal related to a reflected wave based on information related to a transmission wave transmitted by the radar apparatus and information related to a target;
A DA converter that converts the simulated signal generated by the simulated signal generator from a digital signal to an analog signal;
A drive clock generator for generating a drive clock when performing the conversion process in the DA converter;
Receiving the simulation signal converted by the DA converter, the radar apparatus obtains a first frequency, which is a sampling frequency when the simulation signal is converted from an analog signal into a digital signal, from outside the radar apparatus evaluation system. With an acquisition unit to
A radar apparatus that notifies that when the sampling frequency of the DA conversion unit is not included in a predetermined range from a frequency obtained by multiplying the first frequency acquired by the acquisition unit by an integer. Evaluation system. A radar apparatus evaluation system that generates and outputs a simulation signal related to a reflected wave of a transmission wave transmitted by the radar apparatus to a radar apparatus to be evaluated,
A simulated signal generating unit that generates a simulated signal related to a reflected wave based on information related to a transmission wave transmitted by the radar apparatus and information related to a target;
A DA converter that converts the simulated signal generated by the simulated signal generator from a digital signal to an analog signal;
A drive clock generator for generating a drive clock when performing the conversion process in the DA converter;
The frequency of the drive clock generated by the drive clock generator so that the peak of the level value other than the level value corresponding to the target is equal to or lower than a predetermined threshold when the radar apparatus performs frequency analysis of the simulation signal. A radar device evaluation system comprising: a frequency setting unit that sets A radar apparatus evaluation method for generating and outputting a simulation signal related to a reflected wave of a transmission wave transmitted by the radar apparatus to a radar apparatus to be evaluated,
A simulated signal generating step of generating a simulated signal related to a reflected wave based on information related to a transmission wave transmitted by the radar device and information related to a target;
A DA conversion step of converting the simulation signal generated by the simulation signal generation step from a digital signal to an analog signal;
A drive clock generation step for generating a drive clock when performing the conversion process in the DA conversion step;
An acquisition step of acquiring a first frequency that is a sampling frequency when the radar device that has received the simulation signal converted in the DA conversion step converts the simulation signal from an analog signal to a digital signal;
A frequency setting step of setting a second frequency as a frequency of the drive clock generated by the drive clock generation step so as to be within a predetermined range from a frequency obtained by multiplying the first frequency acquired by the acquisition step by an integer. A radar apparatus evaluation method comprising:

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