Test unit for radar system, test method thereof and radar system

Abstract

The invention provides a test unit for a radar system and a test method thereof, and the radar system, and the test unit carries out the gain amplification of a to-be-tested transmission signal in a radar transceiver, which is obtained in real time, through a gain adjustment module, and detects whether the gain value of each time exceeds a set gain value interval through a power detector. And when the gain value of the to-be-detected transmission signal exceeds a set gain value interval, a control signal is generated, and the gain adjusting module is used for adjusting a self circuit according to the control signal so as to improve or reduce the gain value of the to-be-detected transmission signal until the gain value accords with the set gain value interval, and the amplified to-be-detected transmission signal is output. Therefore, the strength of the to-be-tested transmission signal can be monitored, the gain can be automatically adjusted to ensure the test accuracy and stability under different environmental conditions, the influence of gain fluctuation on the test result in the test process is effectively eliminated, the test reliability is improved, and the test efficiency is further improved.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to a test unit for a radar system and a test method thereof, and a radar system. Background Art

[0002] Most current millimeter wave (mmW) radar units are built using mmW integrated circuits (ICs), which include multi-channel transceivers (TX / RX) that can operate on multiple frequency channels. Millimeter wave ICs also include high-frequency devices such as power amplifiers, mixers, low noise amplifiers (LNAs), and analog and analog mixed signal circuits. In the field of automotive radar, the frequencies supported in Europe are mainly in the 76-81GHz band.

[0003] Automotive safety standards, such as ISO26262, require mitigation measures to be taken when safety-related defects occur; these mitigation measures need to be completed within a specified time interval that is small enough to prevent system failures that could pose a danger to people inside or outside the vehicle. Detecting safety-related defects in the radio frequency (RF) front end of an automotive radar system can be performed using a plausibility check performed in the radar unit, which evaluates the output signal of the receiver front end or the output signal of other internal circuits and calculates a target map based on this signal. If this target map shows, for example, targets that suddenly appear or disappear, this will cause the target map to be classified as untrustworthy, and the RF front end or other internal circuits may be defective, so that the radar unit can initiate safety measures, such as a system reset, repeating the measurement cycle, or notifying the driver that the radar system needs to be considered unsafe.

[0004] Although such plausibility checks are very common in safety-critical systems, they have two serious drawbacks. The first drawback is directly related to safety, since every plausibility check carries the risk of a false positive or false negative decision. The second drawback is that plausibility checks need to be performed, documented, and verified for a large number of possible faults (e.g. at circuit nodes) and for several fault models, including transient faults. In order to prove the Automotive Safety Integrity Level (ASIL) of a system according to ISO26262, the diagnostic coverage of the plausibility checks needs to be calculated or evaluated. All these procedures are time-consuming and prone to errors. These two drawbacks make it desirable to avoid plausibility checks and implement as much built-in safety monitoring (e.g. built-in safety testing (BIST)) as possible in the safety-critical elements themselves. In response to such monitoring or testing, the radar unit can initiate safety measures, such as a system reset, repeating the measurement cycle, or notifying the driver that the radar system needs to be considered unsafe. In addition, it is well known that transient faults are a major source of failures, so it is desirable to be able to test for these faults.

[0005] Built-in self-test (BIST) of RF transceivers is an automatic test technology integrated into the RF transceiver chip, which is designed to detect and diagnose hardware faults without relying on external test equipment. This technology is crucial to improving test efficiency and reducing costs during production, as well as achieving real-time fault detection and improving system reliability in practical applications.

[0006] Thus, currently known BISTs are used to determine the performance of ADCs. However, such known BISTs run in parallel with the application operating mode and are intended to cover and identify most static faults leading to complete or parametric failures. Known safety monitors are configured to run outside the application operating mode and are configured to measure, for example, the supply voltage or the transmitted power, thereby identifying most static faults leading to complete or parametric failures, as well as most transient faults leading to complete or parametric failures. However, safety monitors are not suitable for ADCs, because safety monitors monitor "simple" values, such as supply voltage, reference voltage, clock signal, RF amplitude, etc. Failures in ADCs are only occasionally related to these "simple" values, and more often to more complex values, such as resistor values, transistor parameters, etc., which cannot be measured by the safety monitor.

[0007] In the manufacturing process of integrated circuits, testing is a key step to ensure product quality and performance. However, traditional testing methods may be affected by the test signal gain, resulting in inaccurate or unstable test results. Therefore, an improved test mechanism is needed to automatically adjust the gain, which is crucial to improving test efficiency and reliability. Summary of the invention

[0008] In order to solve the above technical problems, the present disclosure provides a test unit and a test method for a radar system, and a radar system, which can effectively eliminate the influence of gain fluctuations during the test process on the test results and improve the test efficiency and reliability.

[0009] In one aspect, the present disclosure provides a test unit for a radar system, the radar system comprising a radar transceiver and a test unit, the test unit being used to detect the power of each transmission signal in the radar transceiver after gain correction, wherein the test unit comprises:

[0010] A gain adjustment module, the gain adjustment module is used to perform gain amplification on the transmission signal to be measured in the radar transceiver acquired in real time;

[0011] a power detector connected to the output end of the gain adjustment module, for detecting whether the gain value of each time exceeds the set gain value interval of the transmission signal to be tested, and generating a control signal when the gain value of the transmission signal to be tested exceeds the set gain value interval,

[0012] The gain adjustment module is also used to adjust its own circuit according to the control signal to increase or decrease the gain value of the transmission signal to be tested until the gain value meets the set gain value range, and output the amplified transmission signal to be tested to the subsequent circuit.

[0013] In some embodiments, the gain adjustment module is further used to repeatedly control the transmission signal to be tested to gradually reduce / increase the signal power level until the gain value meets the set gain value interval.

[0014] In some embodiments, the unit to be tested corresponding to the transmission signal to be tested is one or more target units located at different azimuth angles within the field of view of the radar transceiver.

[0015] In some embodiments, the power detector comprises:

[0016] A storage unit, wherein the storage unit pre-stores a set of set gain value intervals corresponding to the transmission signals to be tested with different input powers,

[0017] The power detector performs an initial comparison based on the acquired parameters of the transmission signal to be measured, and obtains a corresponding set of set gain value intervals based on the comparison result, wherein the parameters include peak value, frequency and signal strength.

[0018] In some embodiments, the gain adjustment module includes:

[0019] A first gain amplifier unit, wherein the input end of the first gain amplifier unit is connected to the transmission signal to be tested, the output end is used to provide a first detection signal, and the control end is used to connect to the control signal, and the first detection signal is the transmission signal to be tested after gain amplification;

[0020] A second gain amplifier unit, wherein the input end of the second gain amplifier unit is connected to the transmission signal to be tested, the output end is used to provide a second detection signal, and the control end is used to connect to the control signal, and the second detection signal is the transmission signal to be tested after gain amplification.

[0021] In some embodiments, the power detector comprises:

[0022] A first power detector, wherein a first input end of the first power detector is connected to the transmission signal to be measured, a second input end of the first power detector is connected to the first detection signal, and an output end of the first power detector is connected to the control end of the first gain amplifier unit for providing the control signal;

[0023] A second power detector, wherein the third input terminal of the second power detector is connected to the transmission signal to be measured, the fourth input terminal is connected to the second detection signal, and the output terminal is connected to the control terminal of the second gain amplifier unit for providing the control signal.

[0024] On the other hand, the present disclosure provides a testing method for a testing unit for a radar system as described above, wherein the radar system comprises a radar transceiver and a testing unit, wherein the testing unit is used to detect the power of each transmission signal in the radar transceiver after gain correction, wherein the testing method comprises:

[0025] Performing gain amplification on the transmission signal to be tested in the radar transceiver acquired in real time;

[0026] Detecting whether the gain value each time exceeds the set gain value interval of the transmission signal to be tested, and generating a control signal when the gain value of the transmission signal to be tested exceeds the set gain value interval;

[0027] The gain amplification parameters are adjusted according to the control signal to increase or decrease the gain value of the transmission signal to be tested, and the gain value of the transmission signal to be tested after gain amplification is re-detected and judged until the gain value meets the set gain value range, and the amplified transmission signal to be tested is output to the subsequent circuit.

[0028] In some embodiments, the step of adjusting the gain amplification parameter according to the control signal to increase or decrease the gain value of the transmission signal to be tested includes:

[0029] The gain adjustment module is used to repeatedly control the transmission signal to be tested by using a control signal to gradually reduce / increase the signal power level until the gain value meets the set gain value interval.

[0030] In some embodiments, the testing method further comprises:

[0031] Pre-storing a plurality of sets of set gain value intervals corresponding to the transmission signals to be tested with different input powers; and

[0032] Performing an initial comparison based on the acquired parameters of the transmission signal to be tested, and obtaining a corresponding set of set gain value intervals based on the comparison results,

[0033] The parameters include peak value, frequency and signal strength.

[0034] On the other hand, the present disclosure further provides a radar system, wherein the radar system comprises:

[0035] Radar transceivers; and

[0036] As the test unit mentioned above, the test unit is used to detect the power of each transmission signal received by the radar transceiver after gain correction.

[0037] The beneficial effects of the present disclosure are as follows: the present disclosure provides a test unit for a radar system and a test method thereof, and a radar system, wherein the test unit uses a gain adjustment module to gain amplify the transmission signal to be tested in the radar transceiver acquired in real time, and uses a power detector to detect whether the gain value each time exceeds the set gain value interval of the transmission signal to be tested, and generates a control signal when the gain value of the transmission signal to be tested exceeds the set gain value interval, and uses the gain adjustment module to adjust its own circuit according to the control signal to increase or decrease the gain value of the transmission signal to be tested, until the gain value meets the set gain value interval, and outputs the amplified transmission signal to be tested to the subsequent circuit. In this way, the strength of the transmission signal to be tested can be monitored and the gain can be automatically adjusted to ensure the accuracy and stability of the test under different environmental conditions, effectively eliminating the influence of gain fluctuations on the test results during the test process, improving the reliability of the test, and thus improving the test efficiency.

[0038] Moreover, in the technical solution disclosed in the present invention, the gain of the transmission signal to be tested will be automatically adjusted according to environmental conditions without the need for human intervention, thereby improving the degree of automation of the test. At the same time, the self-gain correction function can ensure the accuracy and stability of the test results, thereby improving the credibility of the integrated circuit test.

[0039] In addition, the technical solution disclosed in the present invention can adapt to different test environments and working conditions and has strong adaptability and flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings.

[0041] Figure 1 A schematic diagram showing the connection structure of a radar transceiver connected to a built-in self-test circuit in the prior art is shown;

[0042] Figure 2 A schematic diagram showing a scenario in which a radar transceiver encounters different input sources and a device under test with different input powers when using a built-in self-test circuit in the prior art;

[0043] Figure 3 A schematic diagram showing the structure of a test unit for a radar system in an embodiment of the present disclosure is shown;

[0044] Figure 4 Show Figure 3 Schematic diagram of scenarios in which the test unit encounters different input sources and the device under test with different input powers;

[0045] Figure 5 Show Figure 4 Schematic diagram of the logic during implementation in the scenario shown;

[0046] Figure 6 A schematic flow chart of a testing method for a testing unit of a radar system in an embodiment of the present disclosure is shown.

[0047] Technical term explanation

[0048] BIST: Built-in Self Test

[0049] DUT: Device Under Test, device under test

[0050] PD: Peak Detector, power detector

[0051] AMP: Amplifier, amplifier

[0052] LNA: Low Noise Amplifier, low noise amplifier

[0053] PA: Power Amplifier, power amplifier

[0054] PS: Phase Shifter, phase shifter

[0055] IQ Gen: I / Q Modulator DETAILED DESCRIPTION

[0056] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the content of the present disclosure more thorough and comprehensive.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present disclosure belongs. The terms used in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0058] The drawings of the present invention include functional block diagrams showing various interrelated functional modules. These drawings are not detailed circuit diagrams, and the connecting lines therein are only used to represent signal flow. The various interactive relationships between functional components and / or programs do not necessarily need to be achieved through direct electrical connections. In addition, the functions of individual components do not necessarily need to be allocated in the manner shown in the drawings, and distributed blocks do not necessarily need to be implemented with distributed electronic components.

[0059] In radar systems, such as vehicle-based frequency modulated continuous wave (FMCW), a target map is obtained by transmitting several chirps (i.e. short signal blocks with steadily increasing or decreasing frequency) and processing the received digitized echo signals. The target map is a list of target objects, where each target is listed with its target strength, distance and speed relative to the radar unit. The built-in self-test (BIST) in the radar system (RF transceiver) is designed to detect and diagnose hardware faults without relying on external test equipment. This is crucial to improve test efficiency and reduce costs during production, as well as to achieve real-time fault detection and system reliability improvement in actual applications. However, traditional test methods may be affected by the test signal gain, resulting in inaccurate or unstable test results.

[0060] like Figure 1 As shown, the existing radar system includes radio frequency transmitters TX1-TX4 ( Figure 1 TX1 is shown only as an example), RF receivers RX1-RX4 ( Figure 1 Only RX1) and built-in self-test circuit BIST are shown as examples. Among them, the RF transmitter TX outputs a single-carrier or multi-carrier spread spectrum modulated signal through the signal processing module, which is converted by the digital-to-analog converter (DAC), low-pass filtered by the low-pass filter, and up-converted to RF by the up-converter, gain amplified by the variable gain control device (generally a variable gain amplifier (VGA) or a programmable gain controller (PGC) or a programmable gain amplifier (PGA)), filtered by the RF filter, amplified by the power amplifier module, and an antenna filter. Finally, it is transmitted through the antenna, and the signal output by the power amplifier is provided to the signal processing module as a modulated signal and a local oscillator signal in a loopback mode. This is the structure of a conventional transmitter and will not be described in detail here. Similarly, the structure of the RF receiver RX1 is as follows Figure 1 The built-in self-test circuit BIST connects each transmission signal and the in-phase orthogonal signal through a node to perform a mixing gain test.

[0061] In the above Figure 1 On the basis of this, if the number of devices under test (DUT) received by the built-in self-test circuit BIST increases or if test signals with different environmental conditions and different input powers are received (such as Figure 2As shown in the figure, different input sources (such as DUT1 and DUT2) with different input powers (such as pw1 and pw2) may be encountered. At this time, the built-in self-test circuit BIST may not operate at the best performance point, including signal linearity, signal-to-noise ratio, and output power detector resolution. The gain of the built-in self-test circuit BIST cannot be adjusted according to different test signals. In this case, the accuracy and stability of the test results will be reduced, and the credibility of the integrated circuit test will be reduced.

[0062] Based on this, the embodiments of the present disclosure provide a test unit and a test method thereof for a radar system, and a radar system, which can effectively improve the test accuracy and reliability of a built-in self-test circuit BIST.

[0063] Hereinafter, the present disclosure will be described in detail with reference to the accompanying drawings.

[0064] Figure 3 A schematic diagram showing the structure of a test unit for a radar system in an embodiment of the present disclosure is shown. Figure 4 Show Figure 3 The test unit is shown as a schematic diagram of the scenario where the device under test encounters different input sources and has different input powers. Figure 5 Show Figure 4 Diagram of the logic during implementation in the scenario shown.

[0065] like Figure 3 As shown, on the one hand, an embodiment of the present disclosure provides a test unit 100 for a radar system, wherein the radar system includes a radar transceiver (analogous to the RF transmitter and RF receiver described above) and a test unit 100, wherein the test unit 100 is used to automatically detect the power after gain correction of each transmission signal received by the radar transceiver (such as the transmission signal pw1 to be tested corresponding to the device under test DUT1).

[0066] The test unit 100 at least includes: a gain adjustment module AMP and a power detector PD, wherein the gain adjustment module AMP is used to gain amplify the transmission signal to be tested (such as pw1) received by the radar transceiver in real time, and the power detector PD is connected to the output end of the gain adjustment module AMP, and is used to detect whether the gain value of each time exceeds the set gain value interval of the transmission signal to be tested, and when the gain value of the transmission signal to be tested exceeds the set gain value interval, a control signal Ctrl is generated, and the gain adjustment module AMP is also used to adjust its own circuit according to the control signal Ctrl to increase or decrease the gain value of the transmission signal to be tested, until the gain value meets the set gain value interval, and output the amplified transmission signal to be tested to the subsequent circuit. The subsequent circuit includes a built-in self-test circuit BIST and a digital circuit. The purpose of performing power calibration before entering the subsequent circuit is to allow the entire built-in self-test circuit BIST to operate in a range with better accuracy and stability.

[0067] In some embodiments, the gain adjustment module AMP is further used to repeatedly control the transmission signal to be tested to gradually reduce / increase the signal power level until the gain value meets the set gain value interval.

[0068] In some embodiments, the unit under test corresponding to the transmission signal under test is one or more target units (such as devices under test DUT1, DUT2, ...) located at different azimuth angles within the field of view (FOV) of the radar transceiver.

[0069] In some embodiments, the power detector PD may further include: a storage unit (not shown), the storage unit pre-stored with a set of set gain value intervals corresponding to multiple transmission signals to be tested with different input powers, the power detector PD performs an initial comparison based on the acquired parameters of the transmission signals to be tested, and obtains at least one corresponding set of set gain value intervals based on the comparison results, wherein the parameters include peak value, frequency and signal strength.

[0070] like Figure 4 As shown, in some embodiments, the gain adjustment module AMP may include: a first gain amplifier unit AMP1 and a second gain amplifier unit AMP2.

[0071] Among them, the input end of the first gain amplifier unit AMP1 is connected to the transmission signal to be tested, the output end is used to provide a first detection signal, and the control end is used to connect the control signal Ctrl1, the first detection signal is the transmission signal to be tested after gain amplification, the input end of the second gain amplifier unit AMP2 is connected to the transmission signal to be tested, the output end is used to provide a second detection signal, and the control end is used to connect the control signal Ctrl2, the second detection signal is the transmission signal to be tested after gain amplification.

[0072] In some embodiments, the power detector PD comprises:

[0073] A first power detector PD1, wherein a first input terminal of the first power detector PD1 is connected to the transmission signal to be measured, a second input terminal is connected to the first detection signal, and an output terminal is connected to the control terminal of the first gain amplifier unit AMP1, for providing the control signal Ctrl1;

[0074] The second power detector PD2, the third input terminal of the second power detector PD2 is connected to the transmission signal to be measured, the fourth input terminal is connected to the second detection signal, and the output terminal is connected to the control terminal of the second gain amplifier unit AMP2, for providing the control signal Ctrl2.

[0075] More specifically, in the present embodiment, for example, the first power detector PD1 is used to detect the peak value of the first detection signal, and compares the peak value after gain amplification with the upper limit value of the set gain value range. When the peak value is less than the upper limit value, the second power detector PD2 is used to monitor and judge. Otherwise, the first power detector PD1 generates a control signal Ctrl1 according to the detection result, and the control signal Ctrl1 is used to instruct the first gain amplifier unit AMP1 to reduce the signal power level, and then repeatedly detects the peak value of the first detection signal until the above-mentioned judgment condition is met, and then the second power detector PD2 is used to monitor and judge.

[0076] The second power detector PD2 is used to detect the valley value of the second detection signal, compare the valley value after gain amplification with the lower limit value of the set gain value range, and when it is greater than the lower limit value, output the amplified transmission signal to be tested to the subsequent circuit; otherwise, the second power detector PD2 generates a control signal Ctrl2 according to the detection result, and the control signal Ctrl2 is used to instruct the second gain amplifier unit AMP2 to increase the signal power level, and then repeatedly detect the valley value of the second detection signal until the above judgment condition is met, and then output the amplified transmission signal to be tested to the subsequent circuit, such as Figure 5As shown, different calibration targets are given under different devices under test (DUTs), and the two-part self-gain calibration circuit is used to increase the power coverage and enhance the efficiency of the built-in self-test circuit (test unit 100).

[0077] The embodiment scheme of the present disclosure utilizes that the gain of the transmission signal to be tested is automatically adjusted according to environmental conditions without manual intervention, thereby improving the degree of automation of the test. At the same time, the self-gain correction function can ensure the accuracy and stability of the test results, thereby improving the credibility of the integrated circuit test.

[0078] Figure 6 A schematic flow chart of a testing method for a testing unit of a radar system in an embodiment of the present disclosure is shown.

[0079] refer to Figure 6 On the other hand, the embodiment of the present disclosure provides a test method for the test unit 100 for the radar system as described above, wherein the radar system includes a radar transceiver and a test unit 100, wherein the test unit 100 is used to detect the power of each transmission signal in the radar transceiver after gain correction, wherein the test method includes:

[0080] S110: performing gain amplification on the transmission signal to be tested in the radar transceiver acquired in real time.

[0081] S120: Detect whether each gain value exceeds a set gain value interval of the transmission signal to be tested, and generate a control signal when the gain value of the transmission signal to be tested exceeds the set gain value interval.

[0082] S130: Adjust the gain amplification parameters according to the control signal to increase or decrease the gain value of the transmission signal to be tested, re-detect and determine the gain value of the transmission signal to be tested after gain amplification until the gain value meets the set gain value range, and output the amplified transmission signal to be tested to the subsequent circuit.

[0083] In some embodiments, the step of adjusting the gain amplification parameter according to the control signal Ctrl in step S130 to increase or decrease the gain value of the transmission signal to be tested may include:

[0084] The gain adjustment module AMP is repeatedly controlled by the control signal Ctrl to gradually reduce / increase the signal power level until the gain value meets the set gain value interval.

[0085] In some embodiments, the testing method may further include:

[0086] Pre-storing a plurality of sets of set gain value intervals corresponding to the transmission signals to be tested with different input powers; and

[0087] Performing an initial comparison based on the acquired parameters of the transmission signal to be tested, and obtaining a corresponding set of set gain value intervals based on the comparison results,

[0088] The parameters include peak value, frequency and signal strength.

[0089] Based on the same inventive concept, on the other hand, an embodiment of the present disclosure further provides a radar system, wherein the radar system includes:

[0090] Radar transceivers; and

[0091] As described above, the test unit 100 is used to detect the power of each transmission signal received by the radar transceiver after gain correction.

[0092] In summary, the embodiment of the present disclosure provides a test unit 100 for a radar system and a test method thereof, and a radar system, wherein the test unit 100 can use a gain adjustment module AMP to gain amplify the transmission signal to be tested in the radar transceiver acquired in real time, and detect whether the gain value each time exceeds the set gain value interval of the transmission signal to be tested through a power detector PD, and generate a control signal Ctrl when the gain value of the transmission signal to be tested exceeds the set gain value interval, and use the gain adjustment module AMP to adjust its own circuit according to the control signal Ctrl to increase or decrease the gain value of the transmission signal to be tested, until the gain value meets the set gain value interval, and output the amplified transmission signal to be tested to the subsequent circuit. In this way, the strength of the transmission signal to be tested can be monitored and the gain can be automatically adjusted to ensure the test accuracy and stability under different environmental conditions, effectively eliminate the influence of gain fluctuations on the test results during the test process, and effectively improve the test accuracy and reliability of the built-in self-test circuit BIST.

[0093] Moreover, in the technical solution disclosed in the present invention, the gain of the transmission signal to be tested will be automatically adjusted according to environmental conditions without the need for human intervention, thereby improving the degree of automation of the test. At the same time, the self-gain correction function can ensure the accuracy and stability of the test results, thereby improving the credibility of the integrated circuit test.

[0094] In addition, the technical solution disclosed in the present invention can adapt to different test environments and working conditions and has strong adaptability and flexibility.

[0095] It should be noted that in the description of the present disclosure, it needs to be understood that the terms "upper", "lower", "inner" and the like indicating orientation or positional relationship are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0096] In addition, in this article, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0097] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly illustrating the present disclosure, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the scope of protection of the present disclosure.

Claims

1. A test unit for a radar system, the radar system comprising a radar transceiver and a test unit, the test unit being used to detect the power of each transmission signal in the radar transceiver after gain correction, wherein: The test unit comprises: A gain adjustment module, the gain adjustment module is used to perform gain amplification on the transmission signal to be measured in the radar transceiver acquired in real time; a power detector connected to the output end of the gain adjustment module, for detecting whether the gain value of each time exceeds the set gain value interval of the transmission signal to be tested, and generating a control signal when the gain value of the transmission signal to be tested exceeds the set gain value interval, The gain adjustment module is also used to adjust its own circuit according to the control signal to increase or decrease the gain value of the transmission signal to be tested until the gain value meets the set gain value range, and output the amplified transmission signal to be tested to the subsequent circuit.

2. The test unit for a radar system according to claim 1, wherein: The gain adjustment module is further used to repeatedly control the transmission signal to be tested to gradually reduce / increase the signal power level until the gain value meets the set gain value range.

3. The test unit for a radar system according to claim 1, wherein: The unit to be tested corresponding to the transmission signal to be tested is one or more target units located at different azimuth angles within the field of view of the radar transceiver.

4. The test unit for a radar system according to claim 1, wherein: The power detector comprises: A storage unit, wherein the storage unit pre-stores a set of set gain value intervals corresponding to the transmission signals to be tested with different input powers, The power detector performs an initial comparison based on the acquired parameters of the transmission signal to be measured, and obtains a corresponding set of set gain value intervals based on the comparison result, wherein the parameters include peak value, frequency and signal strength.

5. The test unit for a radar system according to claim 1, wherein: The gain adjustment module comprises: A first gain amplifier unit, wherein the input end of the first gain amplifier unit is connected to the transmission signal to be tested, the output end is used to provide a first detection signal, and the control end is used to connect to the control signal, and the first detection signal is the transmission signal to be tested after gain amplification; A second gain amplifier unit, wherein the input end of the second gain amplifier unit is connected to the transmission signal to be tested, the output end is used to provide a second detection signal, and the control end is used to connect to the control signal, and the second detection signal is the transmission signal to be tested after gain amplification.

6. The test unit for a radar system according to claim 5, wherein: The power detector comprises: A first power detector, wherein a first input end of the first power detector is connected to the transmission signal to be measured, a second input end of the first power detector is connected to the first detection signal, and an output end of the first power detector is connected to the control end of the first gain amplifier unit for providing the control signal; A second power detector, wherein the third input terminal of the second power detector is connected to the transmission signal to be measured, the fourth input terminal is connected to the second detection signal, and the output terminal is connected to the control terminal of the second gain amplifier unit for providing the control signal.

7. A test method for a test unit for a radar system according to any one of claims 1 to 6, wherein the radar system comprises a radar transceiver and a test unit, wherein the test unit is used to detect the power of each transmission signal in the radar transceiver after gain correction, wherein: The test method includes: Performing gain amplification on the transmission signal to be tested in the radar transceiver acquired in real time; Detecting whether the gain value each time exceeds the set gain value interval of the transmission signal to be tested, and generating a control signal when the gain value of the transmission signal to be tested exceeds the set gain value interval; The gain amplification parameters are adjusted according to the control signal to increase or decrease the gain value of the transmission signal to be tested, and the gain value of the transmission signal to be tested after gain amplification is re-detected and judged until the gain value meets the set gain value range, and the amplified transmission signal to be tested is output to the subsequent circuit.

8. The testing method according to claim 7, wherein: The step of adjusting the gain amplification parameter according to the control signal to increase or decrease the gain value of the transmission signal to be tested comprises: The gain adjustment module is used to repeatedly control the transmission signal to be tested by using a control signal to gradually reduce / increase the signal power level until the gain value meets the set gain value interval.

9. The testing method according to claim 7, wherein: The test method also includes: Pre-storing a plurality of sets of set gain value intervals corresponding to the transmission signals to be tested with different input powers; and Performing an initial comparison based on the acquired parameters of the transmission signal to be tested, and obtaining a corresponding set of set gain value intervals based on the comparison results, The parameters include peak value, frequency and signal strength.

10. A radar system, comprising: Radar transceiver; as well as The test unit according to any one of claims 1 to 6, wherein the test unit is used to detect the gain-corrected power of each transmission signal received by the radar transceiver.

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