Method, system and device for testing electromagnetic immunity of vehicle-mounted broadcast module and medium

Abstract

The invention discloses a vehicle-mounted broadcast module electromagnetic immunity testing method, system and device and a medium, and relates to the technical field of electromagnetic compatibility testing, and the method comprises the steps: obtaining a test standard parameter of a broadcast receiving module in a test vehicle; the broadcast receiving module comprises at least one modulation mode, and each modulation mode comprises a plurality of test frequency points; for each test frequency point, activating a broadcast receiving module through a broadcast test device according to the test standard parameters; controlling an electromagnetic interference generating device to emit electromagnetic waves to the test vehicle so as to generate electromagnetic interference on the test vehicle; according to the test standard parameters, controlling the broadcast test device to carry out electromagnetic immunity test on a broadcast receiving module of the test vehicle, and recording actual signal-to-noise ratio parameters of each test frequency point; and determining a test result of the broadcast receiving module according to the actual signal-to-noise ratio parameter and the standard signal-to-noise ratio parameter of each test frequency point. According to the scheme, electromagnetic immunity evaluation can be accurately carried out on the broadcast receiving module of the test vehicle.

Description

Technical Field

[0001] The present invention generally relates to the technical field of electromagnetic compatibility testing, and in particular to a method, system, device and medium for testing electromagnetic immunity of a vehicle-mounted broadcast module. Background Art

[0002] With the rapid development of the automotive industry, the intelligence and networking of vehicles are constantly improving. As an important part of the vehicle infotainment system, the vehicle wireless broadcast receiving module has been increasingly applied to vehicle systems due to its wide coverage, strong practicality, and simple operation. Among them, during the use of the vehicle, the stability and reliability of the vehicle wireless broadcast receiving system directly affects the driving experience and safety.

[0003] At present, in the actual vehicle environment, the wireless broadcast receiving system faces extremely complex and harsh electromagnetic interference. There are many electronic devices in the car, such as engine ignition system, motor drive device, vehicle communication module, etc., which will generate electromagnetic radiation of various frequencies and intensities during operation. At the same time, the electromagnetic environment outside the car is also complex, such as base station signals, electromagnetic radiation from high-voltage transmission lines, and electromagnetic interference from other vehicles. These interference sources may cause signal distortion, decreased receiving sensitivity, increased audio noise, or even complete inability to receive signals in the vehicle-mounted wireless broadcast receiving system, which seriously affects the user's listening experience. Therefore, how to perform electromagnetic compatibility testing on the vehicle-mounted wireless broadcast receiving system is an urgent problem to be solved. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a method, system, device and medium for testing the electromagnetic immunity of a vehicle-mounted broadcast module, which can perform electromagnetic immunity evaluation on the wireless broadcast receiving module of the test vehicle, thereby improving the detection efficiency and accuracy of the vehicle-mounted wireless broadcast receiving module.

[0005] In a first aspect, the present invention provides a method for testing electromagnetic immunity of a vehicle-mounted broadcast module, the method comprising: Acquire test standard parameters of a broadcast receiving module in a test vehicle; the test standard parameters refer to parameter information of the test vehicle when no electromagnetic interference is applied; the broadcast receiving module includes at least one modulation mode, and each modulation mode includes multiple test frequency points; For each test frequency point, activating the broadcast receiving module through a broadcast test device according to the test standard parameters; Controlling the electromagnetic interference generating device to emit electromagnetic waves to the test vehicle to generate electromagnetic interference to the test vehicle; According to the test standard parameters, controlling the broadcast test device to perform an electromagnetic interference immunity test on the broadcast receiving module of the test vehicle, and recording the actual signal-to-noise ratio parameters of each test frequency point; The test result of the broadcast receiving module is determined according to the actual signal-to-noise ratio parameters and the standard signal-to-noise ratio parameters of each test frequency point.

[0006] In one of the embodiments, the broadcast test device includes: an audio analyzer and a broadcast signal simulator; According to the test standard parameters, the broadcast test device is controlled to perform an electromagnetic interference immunity test on the broadcast receiving module of the test vehicle, and the actual parameters of the signal-to-noise ratio at each test frequency point are recorded, including: For each test frequency point, controlling the parameter configuration of the broadcast receiving module according to the test standard parameters; the test standard parameters include: receiver parameters and volume adjustment parameters; the receiver parameters include: FM receiver parameters or AM receiver parameters; When the parameter configuration is completed, controlling the audio analyzer to output an audio signal; Controlling the broadcast signal simulator to modulate the audio signal into a broadcast signal; outputting the broadcast signal to the broadcast receiving module so that the broadcast receiving module processes the broadcast signal into a demodulated audio signal and plays it through a speaker in the test vehicle; The audio analyzer receives an input signal sent by the loudspeaker, performs a signal-to-noise ratio analysis based on the input signal, and obtains an actual signal-to-noise ratio parameter of the test frequency point; the input signal is generated by the loudspeaker based on the demodulated audio signal.

[0007] In one embodiment, determining the test result of the broadcast receiving module according to the actual signal-to-noise ratio parameters and the standard signal-to-noise ratio parameters of each test frequency point includes: For each modulation mode, the actual signal-to-noise ratio parameter corresponding to each test frequency point is compared with the standard signal-to-noise ratio parameter to obtain a sub-test result corresponding to the modulation mode; the sub-test result includes a test pass and a test fail; When all sub-test results are tested to be passed, determining that the test result of the broadcast receiving module is tested to be passed; When there is a test failure in all the sub-test results, it is determined that the test result of the broadcast receiving module is a test failure.

[0008] In one embodiment, for each modulation mode, the actual signal-to-noise ratio parameter corresponding to each test frequency point is compared with the standard signal-to-noise ratio parameter to obtain a sub-test result corresponding to the modulation mode, including: When the actual signal-to-noise ratio parameters corresponding to all test frequency points are not less than the standard signal-to-noise ratio parameters, the subtest result corresponding to the modulation mode is determined to be a test pass; When there is a corresponding actual signal-to-noise ratio parameter in all test frequency points that is less than a standard signal-to-noise ratio parameter, it is determined that the subtest result corresponding to the modulation mode is a test failure.

[0009] In one embodiment, performing a signal-to-noise ratio analysis on the input signal to obtain an actual parameter of the signal-to-noise ratio at the test frequency point includes: Performing noise analysis on the input signal to determine the signal power and noise power of the input signal; An actual parameter of the signal-to-noise ratio of the test frequency point is obtained according to the signal power and the noise power.

[0010] In one embodiment, controlling the electromagnetic interference generating device to emit electromagnetic waves to the test vehicle to generate electromagnetic interference to the test vehicle includes: According to preset configuration parameters of the electromagnetic interference generating device, controlling parameter configuration of the electromagnetic interference generating device; Controlling the signal generator in the electromagnetic interference generating device that has completed parameter configuration to generate an initial radio frequency signal; According to the electric field strength value calibrated at the test site where the test vehicle is located, controlling the power amplifier in the electromagnetic interference generating device to amplify the initial radio frequency signal; The radio frequency antenna in the electromagnetic interference generating device is controlled to transmit the amplified radio frequency signal to the test vehicle to generate electromagnetic interference to the test vehicle.

[0011] In a second aspect, an embodiment of the present application provides an electromagnetic immunity test system for a vehicle-mounted broadcast module, the system comprising: a broadcast test device, a main control device, and an electromagnetic interference generating device; the main control device establishes a communication connection with the broadcast test device and the electromagnetic interference generating device respectively; the broadcast test device establishes a communication connection with a broadcast receiving module in a test vehicle; The main control device is used to: obtain the test standard parameters of the broadcast receiving module in the test vehicle; the broadcast receiving module includes at least one modulation mode, and each modulation mode includes multiple test frequencies; for each test frequency, according to the test standard parameters, activate the broadcast receiving module through the broadcast testing device; control the electromagnetic interference generating device to emit electromagnetic waves to the test vehicle to generate electromagnetic interference to the test vehicle; according to the test standard parameters, control the broadcast testing device to perform electromagnetic immunity test on the broadcast receiving module of the test vehicle, and record the actual signal-to-noise ratio parameters of each test frequency; determine the test result of the broadcast receiving module according to the actual signal-to-noise ratio parameters of each test frequency and the signal-to-noise ratio standard parameters; the test standard parameters refer to the parameter information of the test vehicle when no electromagnetic interference is applied; The electromagnetic interference generating device is used to: emit electromagnetic waves to the test vehicle to generate electromagnetic interference to the test vehicle; The broadcast testing device is used to perform an electromagnetic interference immunity test on the steering wheel broadcast receiving module of the test vehicle.

[0012] In a third aspect, an embodiment of the present application provides a main control device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method provided in the above embodiment.

[0013] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method provided in the above embodiment is implemented.

[0014] The embodiments of the present application provide a method, system, device and medium for testing the electromagnetic immunity of a vehicle-mounted broadcast module. The method includes: obtaining test standard parameters of a broadcast receiving module in a test vehicle; the test standard parameters refer to parameter information of the test vehicle when no electromagnetic interference is applied; the broadcast receiving module includes at least one modulation mode, and each modulation mode includes multiple test frequencies; for each test frequency, according to the test standard parameters, the broadcast receiving module is activated by a broadcast test device; the electromagnetic interference generating device is controlled to emit electromagnetic waves to the test vehicle to generate electromagnetic interference to the test vehicle; according to the test standard parameters, the broadcast test device is controlled to perform an electromagnetic immunity test on the broadcast receiving module of the test vehicle, and the actual signal-to-noise ratio parameters of each test frequency are recorded; according to the actual signal-to-noise ratio parameters of each test frequency and the standard signal-to-noise ratio parameters, the test result of the broadcast receiving module is determined. Compared with the prior art, on the one hand, this technical solution can simulate the situation where the vehicle receives different broadcast signals during actual use by setting multiple frequency points and activating the broadcast receiving module according to the obtained test standard parameters, ensuring that the broadcast receiving module can work normally under various common broadcast frequencies, and emitting electromagnetic waves to the test vehicle through the electromagnetic interference generating device, so as to simulate a more realistic electromagnetic interference environment for the test vehicle; on the other hand, after applying electromagnetic interference, the electromagnetic immunity test of the broadcast receiving module is performed through the broadcast test device, which can more comprehensively and accurately evaluate the actual signal-to-noise ratio parameters of the broadcast receiving module at different frequencies, and comprehensively consider the actual signal-to-noise ratio parameters and the signal-to-noise ratio standard parameters of each test frequency point, so as to accurately determine the test results of the vehicle-mounted broadcast receiving module, verify the adaptability of the vehicle-mounted wireless broadcast receiving module in a complex electromagnetic environment, improve the detection efficiency and accuracy of the wireless broadcast receiving module, and further improve the safety of vehicle driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 A schematic diagram of the structure of the electromagnetic immunity test system for the vehicle broadcast module provided in an embodiment of the present application; Figure 2 A flow chart of a method for testing the electromagnetic interference immunity of a vehicle broadcast module provided in an embodiment of the present application; Figure 3 A schematic diagram of the structure of an electromagnetic immunity test system for a vehicle broadcast module provided by another embodiment of the present application; Figure 4 A flow chart of a method for controlling a broadcast test device to perform an electromagnetic interference immunity test on a broadcast receiving module of a test vehicle provided in an embodiment of the present application; Figure 5A schematic flow chart of a method for testing electromagnetic interference immunity of a vehicle broadcast module provided by another embodiment of the present application; Figure 6 A schematic diagram of the structure of the main control device provided in an embodiment of the present application.

[0016] Description of Reference Numerals Broadcast test device-10; audio analyzer-11; broadcast signal simulator-12; main control device-20; electromagnetic interference generating device-30; test cavity-31; signal generator-32; power amplifier-33; radio frequency antenna-34; test computer-35; test vehicle-40; broadcast receiving module-41; speaker-42. DETAILED DESCRIPTION

[0017] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0018] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0019] It is understandable that in the rapid development of vehicle technology, the vehicle radio module, as a radio receiving device, is very susceptible to interference from the electromagnetic environment. As the degree of vehicle electrification increases, the system itself is also very susceptible to interference from the vehicle, which can easily lead to signal instability and other conditions under electromagnetic interference, thus affecting safe driving. Therefore, how to conduct electromagnetic compatibility testing on vehicle radio modules is an urgent problem to be solved.

[0020] Based on the above-mentioned defects, the present application provides a method, system, device and medium for testing the electromagnetic immunity of a vehicle-mounted broadcast module. Compared with the prior art, on the one hand, the technical solution can simulate the situation where the vehicle receives different broadcast signals during actual use by setting multiple frequency points and activating the broadcast receiving module according to the obtained test standard parameters, thereby ensuring that the broadcast receiving module can work normally under various common broadcast frequencies, and transmitting electromagnetic waves to the test vehicle through an electromagnetic interference generating device to simulate a more realistic electromagnetic interference environment for the test vehicle; on the other hand, after applying electromagnetic interference, the electromagnetic immunity test of the broadcast receiving module is performed through a broadcast testing device, which can more comprehensively and accurately evaluate the actual signal-to-noise ratio parameters of the broadcast receiving module at different frequencies, and comprehensively consider the actual signal-to-noise ratio parameters and the signal-to-noise ratio standard parameters of each test frequency point, so as to accurately determine the test results of the vehicle-mounted broadcast receiving module, verify the adaptability of the vehicle-mounted wireless broadcast receiving module in a complex electromagnetic environment, improve the detection efficiency and accuracy of the wireless broadcast receiving module, and further improve the safety of vehicle driving.

[0021] See also Figure 1 As shown, Figure 1 The structure diagram of the electromagnetic immunity test system of the vehicle broadcast module is shown in FIG. The system includes: a broadcast test device 10, a main control device 20, and an electromagnetic interference generating device 30; the main control device 20 establishes communication connections with the broadcast test device 10 and the electromagnetic interference generating device 30 respectively; and the broadcast test device 10 establishes communication connection with the broadcast receiving module 41 in the test vehicle 40.

[0022] It should be noted that the above-mentioned vehicle-mounted broadcast module electromagnetic immunity test system is used to perform electromagnetic immunity test on the broadcast receiving module 41 of the test vehicle 40. The test vehicle 40 refers to a vehicle that needs to perform electromagnetic immunity test on the broadcast receiving module 41, and the test vehicle 40 may include: a driving system, a braking system, a hands-off detection system, a wire-controlled steering system, etc. The broadcast receiving module 41 may be a vehicle-mounted broadcast receiving system built into the test vehicle, for example, a vehicle-mounted wireless broadcast receiving system.

[0023] The broadcast test device 10 is a device for testing and controlling the broadcast receiving module 41 of the test vehicle 40 .

[0024] The electromagnetic interference generating device 30 is a device for generating interference to the test vehicle 40 . The electromagnetic interference generating device 30 is used for: emitting electromagnetic waves to the test vehicle 40 to generate electromagnetic interference to the test vehicle 40 .

[0025] The main control device 20 has the functions of processing, receiving and sending data, and may include a server and a terminal that establishes a communication connection with the server. Optionally, the server may be a single server, or a server cluster or distributed system composed of several servers, or a cloud server that provides cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, content delivery networks (CDN), and basic cloud computing services such as big data and artificial intelligence platforms. An operating system may be running on the terminal, and the operating system may include but is not limited to Android systems, IOS systems, Linux systems, Unix, Windows systems, etc. It may also include a user interface (UI) layer, which may provide data display to the outside through the UI layer. In addition, it may also send data to the electromagnetic interference generating device 30 and the broadcast test device 10 based on the application programming interface (API), and be used to receive data transmitted by the electromagnetic interference generating device 30 and the broadcast test device 10.

[0026] Servers and terminals may be equipped with microprocessors (MCU), memories (ROM, RAM), input / output interfaces (I / O), analog-to-digital converters (A / D), and large-scale integrated circuits such as shaping and driving.

[0027] In order to better understand and illustrate the electromagnetic interference immunity test method of the vehicle broadcast module provided in the embodiment of the present application, the following is Figures 2 to 6 Detailed explanation.

[0028] Figure 2 A flow chart of a method for testing electromagnetic interference immunity of a vehicle-mounted broadcast module provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, the method is executed by a main control device, and the main control device can be implemented as part or all of the main control device by software, hardware, or a combination of software and hardware. The method includes: S101. Acquire test standard parameters of a broadcast receiving module in a test vehicle; the test standard parameters refer to parameter information of the test vehicle when no electromagnetic interference is applied; the broadcast receiving module includes at least one modulation mode, and each modulation mode includes multiple test frequency points.

[0029] The above-mentioned test vehicle may be one or more, and the test vehicle may be an electric vehicle, a fuel vehicle, or a hybrid vehicle. A broadcast receiving module may be provided inside the test vehicle. The broadcast receiving module is an electronic system for receiving and processing broadcast signals so that users can listen to radio programs, and includes at least one modulation mode, such as frequency modulation (FM) mode and amplitude modulation (AM) mode. Each modulation mode may include multiple test frequency points. For FM modulation mode, the test frequency points may include: 90.1MHz, 98.1MHz, 106.1MHz; for AM modulation mode, the test frequency points may include: 603kHz, 999kHz, 1404kHz.

[0030] Specifically, taking the broadcast receiving module as a broadcast receiving system as an example, before the test, the main control device can detect the test vehicle to determine whether the test vehicle meets the test conditions, such as determining whether the internal broadcast receiving system of the test vehicle is normal and whether the vehicle operation status is normal; when the broadcast receiving system is normal and the operation status is normal, it indicates that the test vehicle meets the test conditions; when the broadcast receiving system is abnormal or the operation status is abnormal, it indicates that the test vehicle does not meet the test conditions. Among them, the preset test conditions can be customized according to the actual attribute parameters of the vehicle and the test requirements.

[0031] In one embodiment, the test standard parameters include: receiver parameters and volume adjustment parameters, the receiver parameters include FM receiver parameters and AM receiver parameters, and the volume adjustment parameters include: volume, standard output voltage. Among them, the FM receiver parameters include at least one of the following: FM receiver frequency, modulation frequency, frequency deviation, input level of the device under test, etc.; the AM receiver parameters include at least one of the following: AM receiver frequency, modulation frequency, modulation degree, output level of the signal generator.

[0032] Optionally, the above-mentioned test standard parameters can be customized according to actual needs, or can be obtained by importing through an external device, or can be obtained from a blockchain or database. The embodiment of the present application does not impose any limitation on the method of obtaining the test standard parameters.

[0033] S102: For each test frequency point, activate the broadcast receiving module through the broadcast test device according to the test standard parameters.

[0034] The broadcast test device includes: an audio analyzer and a broadcast signal simulator. The audio analyzer is used to output an audio signal and send it to the broadcast signal simulator, and the broadcast signal simulator is used to modulate the audio signal output by the audio analyzer, and the modulation mode is AM modulation and FM modulation.

[0035] In the embodiment of the present application, after obtaining the test standard parameters, a specific implementation method for activating the broadcast receiving module through the broadcast test device according to the test standard parameters for each test frequency point is also provided. Taking the broadcast receiving module as a vehicle-mounted wireless broadcast receiving system as an example, the test vehicle is placed in the test cavity, the vehicle-mounted wireless broadcast system is in working state, the test standard parameters are configured for the vehicle-mounted wireless broadcast receiving system, and then an audio signal is sent out through the audio analyzer in the broadcast test device, which is modulated into FM and AM broadcast signals respectively through a broadcast signal simulator, and directly input to the antenna port of the vehicle-mounted wireless broadcast receiving terminal through a coaxial cable. After being processed by the vehicle-mounted wireless broadcast receiving system, the broadcast signal is converted into a demodulated audio signal and input into the speaker in the car, and the input signal of the speaker is injected back into the audio analyzer to activate the vehicle-mounted wireless broadcast receiving system.

[0036] Before conducting the electromagnetic immunity test, the test site needs to be calibrated. The calibration methods can include: free field test calibration and electromagnetic reverberation chamber test calibration. Different calibration methods correspond to different test sites. During on-site calibration, there is no need for vehicles to appear at the test site. The test site can be arranged according to the test standard requirements, and the field strength probe can be placed in the test area. Unmodulated sine waves can be used for calibration to record the forward power required for the specified field strength generated at each test frequency. The forward power determines the electric field strength value when electromagnetic interference is applied to the test vehicle. When calibrating the test site using the external radiation source method, the electric field strength value needs to be calibrated under both vertical polarization and horizontal polarization conditions; when testing using the reverberation chamber method, only one calibration is required, and the field uniformity needs to be verified to ensure that the test site meets the test requirements.

[0037] After the test site calibration of the test vehicle is completed, the electromagnetic immunity test device can be prepared, and the test site and test conditions can be selected according to the test standards. By placing the test vehicle completely in the electromagnetic interference environment and monitoring the test process of the test vehicle through the main control device, the electromagnetic immunity test of the broadcast receiving module of the test vehicle can be performed to obtain the test results.

[0038] In this embodiment, by obtaining the test standard parameters before generating electromagnetic interference to the test vehicle, the situation in which the vehicle receives different broadcast signals during actual use can be more comprehensively simulated, thereby improving the accuracy of the electromagnetic immunity test.

[0039] S103, controlling the electromagnetic interference generating device to emit electromagnetic waves to the test vehicle to generate electromagnetic interference to the test vehicle.

[0040] It is understandable that in order to verify the adaptability of the broadcast receiving module of the test vehicle in a complex electromagnetic environment, it is necessary to generate electromagnetic interference to the test vehicle. The main control device can generate electromagnetic interference to the test vehicle by controlling the electromagnetic interference generating device to emit electromagnetic waves to the test vehicle.

[0041] Among them, see Figure 3 As shown, the electromagnetic interference generating device may include a test cavity 31, a signal generating source 32, a power amplifier 33, a radio frequency antenna 34 and a test computer 35, wherein the radio frequency antenna 34 is located in the test cavity 31. The test computer 35 is electrically connected to the signal generating source 32. The test computer 35 is internally configured with a test software, and the user can test the broadcast receiving module of the test vehicle by running the test software. The broadcast test device 10 may include an audio analyzer 11 and a broadcast signal simulator 12. The main control device 20 may be electrically connected to the electromagnetic interference generating device 30 and the broadcast test device 10.

[0042] Specifically, in the process of generating electromagnetic interference to the test vehicle, the main control device can first control the parameter configuration of the electromagnetic interference generating device according to the preset configuration parameters of the electromagnetic interference generating device. After the parameter configuration is completed, the signal generating source in the electromagnetic interference generating device that has completed the parameter configuration is controlled to generate an initial radio frequency signal. Then, according to the electric field strength value calibrated at the test site where the test vehicle is located, the power amplifier in the electromagnetic interference generating device is controlled to amplify the initial radio frequency signal to obtain an amplified radio frequency signal, and the radio frequency antenna in the electromagnetic interference generating device is controlled to transmit the amplified radio frequency signal to the test vehicle to generate electromagnetic interference to the test vehicle.

[0043] The above configuration parameters may be customized by the user according to the properties of the actual electromagnetic interference generating device and the electromagnetic compatibility test requirements, and may include, for example, the electric field strength value of the test site, the antenna polarization direction, etc.

[0044] The main control device can first control the electromagnetic interference generating device to configure the electric field strength value and the antenna polarization direction according to the preset configuration parameters, for example, setting the electric field strength value to the calibrated electric field strength value, and setting the antenna polarization direction to a 360° random polarization mode. After the parameter configuration is completed, a control instruction is generated, and the control instruction is sent to the electromagnetic interference generating device, so that the test computer in the electromagnetic interference generating device receives and responds to the control instruction, generates a control signal and sends it to the signal generating source, so that the signal generating source generates an initial radio frequency signal, which can be a specified modulation mode or an unmodulated electromagnetic wave, and controls the power amplifier to amplify the initial radio frequency signal to obtain an amplified radio frequency signal, and then transmits the amplified radio frequency signal to the test vehicle through the radio frequency antenna, thereby forming an electromagnetic environment to generate electromagnetic interference to the test vehicle.

[0045] In this step, electromagnetic waves are emitted to the test vehicle, which can generate electromagnetic interference to the test vehicle, thereby simulating an electromagnetic interference environment for the test vehicle, so as to impose an environment that is more in line with the actual application scenario on the test vehicle, and facilitate subsequent electromagnetic compatibility testing of the broadcast receiving module of the test vehicle.

[0046] S104. According to the test standard parameters, control the broadcast test device to perform an electromagnetic interference immunity test on the broadcast receiving module of the test vehicle, and record the actual signal-to-noise ratio parameters of each test frequency point.

[0047] It is understandable that for broadcast receiving modules, signals of different frequencies may differ in propagation characteristics, interference conditions, etc. Only by testing at multiple frequency points can we accurately determine whether the electromagnetic interference resistance of the overall performance of the broadcast receiving module meets the requirements.

[0048] In one of the embodiments of the present application, a specific implementation method of controlling the broadcast test device to perform an electromagnetic interference immunity test on the broadcast receiving module of the test vehicle according to the test standard parameters and recording the actual parameters of the signal-to-noise ratio is also provided. Figure 4 As shown, for each test frequency point, the method includes: S201. Controlling parameter configuration of a broadcast receiving module according to test standard parameters; the test standard parameters include: receiver parameters and volume adjustment parameters; the receiver parameters include: FM receiver parameters or AM receiver parameters.

[0049] S202: When parameter configuration is completed, control the audio analyzer to output an audio signal.

[0050] S203: Control the broadcast signal simulator to modulate the audio signal into a broadcast signal.

[0051] S204: Output the broadcast signal to the broadcast receiving module, so that the broadcast receiving module processes the broadcast signal into an audio signal and plays it through a speaker in the test vehicle.

[0052] S205 , receiving an input signal sent by the loudspeaker through an audio analyzer, performing a signal-to-noise ratio analysis according to the input signal, and obtaining an actual parameter of the signal-to-noise ratio.

[0053] Specifically, the test standard parameters include: FM receiver parameters, AM receiver parameters and volume adjustment parameters. FM receiver parameters include FM receiver frequency, frequency deviation, modulation frequency, and input level of the signal of the tested machine corresponding to the FM modulation mode; AM receiver parameters include: AM receiver frequency, modulation degree, modulation frequency; audio adjustment parameters include: standard output voltage.

[0054] Among them, for the FM receiver parameters, the FM receiver frequencies include 90.1MHz, 98.1MHz, and 106.1MHz, which simulate different FM broadcast frequencies to test the performance of the vehicle-mounted FM receiver at different frequencies. The frequency deviation can be set to ±22.5kHz. The frequency deviation is the maximum offset of the carrier frequency relative to the center frequency in the FM signal, which determines the bandwidth and anti-interference ability of the FM signal. The modulation frequency can be 1kHz, which is the frequency at which the audio signal modulates the carrier and represents the frequency component of the audio signal. Usually, testing at this frequency can reflect the processing ability of the vehicle-mounted broadcast system for common audio signals. The input level of the signal of the tested machine can be set to 60dBμV, which is the signal strength input to the vehicle-mounted FM receiver. This level value is specified to test the performance of the FM receiver under a unified standard. For the AM receiver parameters, the frequency can be set to 603kHz, 999kHz, and 1404kHz to test the performance of the vehicle-mounted AM receiver at different AM broadcast frequencies. The modulation index can be 30%. The modulation index indicates the degree of control of the modulation signal on the carrier amplitude, which affects the envelope shape and information transmission efficiency of the AM signal. The modulation frequency can be 1kHz, which is consistent with the modulation frequency in the FM test, so as to compare the performance of FM and AM receivers under the same audio frequency conditions. The output level of the signal generator can be set to 74dBμV, which is the signal strength input to the car AM receiver. It is different from the input level of the FM receiver because the characteristics of AM and FM systems are different and need to be tested at their respective appropriate levels. For the volume control parameter, adjust the volume controller to a standard output voltage (such as 1.4V) to ensure that the signal-to-noise ratio test is performed at a uniform volume level, because the volume will affect the actual strength of the signal and the human ear's perception of sound quality. Unifying the volume standard can make the test results more comparable.

[0055] Specifically, according to the test standard parameters, set the FM or AM broadcast signal frequency and modulation mode, and at the same time, adjust the volume controller to set the output voltage to ensure that the signal strength input to the vehicle-mounted wireless broadcast receiving terminal is moderate. The audio signal generated by the audio analyzer is input into the broadcast signal simulator, and the broadcast signal simulator modulates the audio signal into a specified type of broadcast signal (FM or AM). Then, the modulated broadcast signal is directly injected into the antenna port of the vehicle-mounted wireless broadcast receiving terminal through a coaxial cable. The broadcast signal is processed by the vehicle-mounted wireless receiving system and converted into a demodulated audio signal and input into the in-vehicle speaker. Then the speaker collects the demodulated audio signal and inputs it into the audio analyzer for analysis to obtain the actual signal-to-noise ratio parameters. Among them, the input signal is generated by the speaker based on the demodulated audio signal.

[0056] The step of performing a signal-to-noise ratio analysis on the input signal to obtain the actual signal-to-noise ratio parameter includes: performing a noise analysis on the input signal to determine the signal power and noise power of the input signal; and obtaining the actual signal-to-noise ratio parameter based on the signal power and noise power.

[0057] Specifically, the effective power of the input signal collected from the speaker is measured by using an audio analyzer to obtain the signal power, and the power of the background noise is measured to obtain the noise power, and then the actual parameter of the signal-to-noise ratio is obtained according to the signal power and the noise power.

[0058] For example, taking the broadcast receiving module as a vehicle-mounted wireless broadcast receiving system, when the test frequency points of the FM receiver include 90.1MHz, 98.1MHz, and 106.1MHz, the electromagnetic interference immunity test can be performed on each frequency point in turn. First, the vehicle-mounted wireless broadcast receiving system is controlled to work at 90.1MHz, and the vehicle-mounted wireless broadcast receiving system is activated according to the test standard parameters, and the audio control parameters are adjusted. Then, the electromagnetic interference generating device is controlled to generate electromagnetic interference to the test vehicle, and the broadcast test device is controlled to perform an electromagnetic interference immunity test on the broadcast receiving module of the test vehicle, and the actual signal-to-noise ratio parameters when the test frequency point is 90.1MHz are recorded. After the electromagnetic interference immunity test on 90.1MHz is completed, the vehicle-mounted wireless broadcast receiving system is controlled to work at 98.1MHz, and the vehicle-mounted wireless broadcast receiving system is reactivated. According to the above steps, electromagnetic interference is applied to the test vehicle and the broadcast test device is controlled to perform an electromagnetic interference immunity test on the broadcast receiving module of the test vehicle, and the actual signal-to-noise ratio parameters when the test frequency point is 98.1MHz are recorded. Similarly, the actual signal-to-noise ratio parameters when the test frequency is 106.1 MHz are obtained according to the above steps.

[0059] Similar to the test frequency points of the FM modulation mode, the above electromagnetic immunity test can be performed on the test frequency points corresponding to the AM modulation mode in sequence to obtain the actual signal-to-noise ratio parameters corresponding to each test frequency point of the AM modulation mode.

[0060] S105 : Determine the test result of the broadcast receiving module according to the actual signal-to-noise ratio parameters and the standard signal-to-noise ratio parameters of each test frequency point.

[0061] It should be noted that the above-mentioned actual signal-to-noise ratio parameters refer to the parameters obtained after the signal-to-noise ratio analysis of the input signal fed back by the speaker is performed after electromagnetic interference is applied to the test vehicle, and the above-mentioned standard signal-to-noise ratio parameters refer to the parameters obtained after the signal-to-noise ratio analysis of the input signal fed back by the speaker is performed after electromagnetic interference is not applied to the test vehicle, which can be measured in real time or obtained in advance through external equipment. Among them, for different modulation modes, the corresponding standard signal-to-noise ratio parameters may be different. The test results of the above-mentioned broadcast receiving module are used to characterize whether the electromagnetic immunity test of the broadcast receiving module of the test vehicle has passed or failed.

[0062] In one embodiment, after the above steps S101-S104, the present application further provides a specific implementation method for determining the test result of the broadcast receiving module according to the actual signal-to-noise ratio parameters and the standard signal-to-noise ratio parameters of each test frequency point. Figure 5 As shown, the method includes: S301. For each modulation mode, compare the actual signal-to-noise ratio parameter corresponding to each test frequency point with the standard signal-to-noise ratio parameter to obtain a sub-test result corresponding to the modulation mode; the sub-test result includes a test pass and a test fail.

[0063] S302: When all sub-test results are tested as passed, determine that the test result of the broadcast receiving module is tested as passed.

[0064] S303: When there is a test failure in all sub-test results, determine that the test result of the broadcast receiving module is a test failure.

[0065] It should be noted that after the test is completed, the data needs to be evaluated. The actual signal-to-noise ratio parameters corresponding to each modulation mode can be compared with the standard signal-to-noise ratio parameters. For example, the standard signal-to-noise ratio parameter corresponding to the FM modulation mode is 55dB, and the standard signal-to-noise ratio parameter corresponding to the AM modulation mode is 43dB.

[0066] It is understandable that for FM receivers, the signal-to-noise ratio should be maintained at no less than 55dB, which means that under the test conditions set above, the ratio of the signal power output by the FM receiver to the noise power should be no less than 55dB after logarithmic calculation. Only when this standard is met can the FM receiver be considered to have good signal quality at the test frequency and provide clear and stable audio playback effects. For AM receivers: it is stipulated that the signal-to-noise ratio should be maintained at no less than 43dB. This is the requirement for the signal quality of AM receivers. Due to the characteristics of the AM signal itself, its signal-to-noise ratio requirement is slightly lower than that of FM, but it also needs to reach 43dB to ensure that the audio quality is within an acceptable range and that the broadcast content can be clearly heard.

[0067] Among them, the actual noise ratio parameter corresponding to each test frequency point is compared with the signal-to-noise ratio standard parameter to obtain the sub-test result corresponding to the modulation mode, including: when the actual signal-to-noise ratio parameters corresponding to all test frequencies are not less than the signal-to-noise ratio standard parameter, the sub-test result corresponding to the modulation mode is determined to be a test pass; when there is a corresponding actual signal-to-noise ratio parameter less than the signal-to-noise ratio standard parameter in all test frequencies, the sub-test result corresponding to the modulation mode is determined to be a test fail.

[0068] Exemplarily, for the FM modulation mode, taking the standard parameter of the signal-to-noise ratio as 55dB as an example, after obtaining the actual signal-to-noise ratio parameters of the corresponding test frequencies, the test frequencies include: 90.1MHz, 98.1MHz, and 106.1MHz, the actual signal-to-noise ratio parameters corresponding to the test frequencies can be compared with the standard parameter of the signal-to-noise ratio of 55dB to determine whether the actual signal-to-noise ratio parameters corresponding to the test frequencies are less than the standard parameter of the signal-to-noise ratio of 55dB. When the actual signal-to-noise ratio parameters corresponding to all test frequencies are not less than the standard parameter of the signal-to-noise ratio of 55dB, the sub-test result corresponding to the FM modulation mode is determined to be a passed test; when there are corresponding actual noise ratio parameters in all test frequencies that are less than the standard parameter of the signal-to-noise ratio of 55dB, the sub-test result corresponding to the FM modulation mode is determined to be a failed test.

[0069] Similarly, for the AM modulation mode, taking the standard parameter of the signal-to-noise ratio as 43dB as an example, after obtaining the actual signal-to-noise ratio parameters of the corresponding test frequencies, which include: 603kHz, 999kHz, and 1404kHz, the actual signal-to-noise ratio parameters corresponding to each test frequency can be compared with the standard parameter of the signal-to-noise ratio of 43dB to determine whether the actual signal-to-noise ratio parameters corresponding to each test frequency are less than the standard parameter of the signal-to-noise ratio of 43dB. When the actual signal-to-noise ratio parameters corresponding to all test frequencies are not less than the standard parameter of the signal-to-noise ratio of 43dB, the sub-test result corresponding to the AM modulation mode is determined to be a passed test; when there are corresponding actual parameters of the noise ratio in all test frequencies that are less than the standard parameter of the signal-to-noise ratio of 43B, the sub-test result corresponding to the AM modulation mode is determined to be a failed test.

[0070] When the sub-test results corresponding to the FM modulation mode and the sub-test results corresponding to the AM modulation mode are both passed, the test result of the broadcast receiving module is determined to be passed; when one of the sub-test results corresponding to the FM modulation mode and the sub-test results corresponding to the AM modulation mode fails the test, the test result of the broadcast receiving module is determined to be failed.

[0071] Furthermore, after determining the test results of the broadcast receiving module, they can be organized to generate a test report. By generating the test report, the stability and reliability of the vehicle-mounted wireless broadcast receiving system under various electromagnetic interference environments that may be encountered in actual use can be accurately reflected, and it will help promote the further development of the vehicle-mounted wireless broadcast receiving system.

[0072] The embodiment of the present application provides a method for testing the electromagnetic immunity of a vehicle-mounted broadcast module, the method comprising: obtaining test standard parameters of a broadcast receiving module in a test vehicle; the test standard parameters refer to parameter information of the test vehicle when no electromagnetic interference is applied; the broadcast receiving module comprises at least one modulation mode, and each modulation mode comprises a plurality of test frequencies; for each test frequency, according to the test standard parameters, activating the broadcast receiving module through a broadcast testing device; controlling an electromagnetic interference generating device to emit electromagnetic waves to the test vehicle to generate electromagnetic interference to the test vehicle; according to the test standard parameters, controlling the broadcast testing device to perform an electromagnetic immunity test on the broadcast receiving module of the test vehicle, and recording the actual signal-to-noise ratio parameters of each test frequency; determining the test result of the broadcast receiving module according to the actual signal-to-noise ratio parameters of each test frequency and the standard signal-to-noise ratio parameters. Compared with the prior art, on the one hand, this technical solution can simulate the situation where the vehicle receives different broadcast signals during actual use by setting multiple frequency points and activating the broadcast receiving module according to the obtained test standard parameters, ensuring that the broadcast receiving module can work normally under various common broadcast frequencies, and emitting electromagnetic waves to the test vehicle through the electromagnetic interference generating device, so as to simulate a more realistic electromagnetic interference environment for the test vehicle; on the other hand, after applying electromagnetic interference, the electromagnetic immunity test of the broadcast receiving module is performed through the broadcast test device, which can more comprehensively and accurately evaluate the actual signal-to-noise ratio parameters of the broadcast receiving module at different frequencies, and comprehensively consider the actual signal-to-noise ratio parameters and the signal-to-noise ratio standard parameters of each test frequency point, so as to accurately determine the test results of the vehicle-mounted broadcast receiving module, verify the adaptability of the vehicle-mounted wireless broadcast receiving module in a complex electromagnetic environment, improve the detection efficiency and accuracy of the wireless broadcast receiving module, and further improve the safety of vehicle driving.

[0073] On the other hand, please continue to see Figure 1 As shown, an embodiment of the present application provides an electromagnetic immunity test system for a vehicle-mounted broadcast module, the system comprising: a broadcast test device 10, a main control device 20, and an electromagnetic interference generating device 30; the main control device 20 establishes communication connections with the broadcast test device 10 and the electromagnetic interference generating device 30 respectively, and the broadcast test device 10 establishes a communication connection with a broadcast receiving module 41 in the test vehicle.

[0074] The main control device 20 is used to: obtain the test standard parameters of the broadcast receiving module in the test vehicle; the broadcast receiving module includes at least one modulation mode, and each modulation mode includes multiple test frequencies; for each test frequency, according to the test standard parameters, activate the broadcast receiving module 41 through the broadcast testing device 10; control the electromagnetic interference generating device 30 to emit electromagnetic waves to the test vehicle to generate electromagnetic interference to the test vehicle; according to the test standard parameters, control the broadcast testing device 10 to perform an electromagnetic immunity test on the broadcast receiving module 41 of the test vehicle, and record the actual signal-to-noise ratio parameters of each test frequency; determine the test results of the broadcast receiving module 41 according to the actual signal-to-noise ratio parameters of each test frequency and the signal-to-noise ratio standard parameters; the test standard parameters refer to the parameter information of the test vehicle when no electromagnetic interference is applied.

[0075] The electromagnetic interference generating device 30 is used to emit electromagnetic waves to the test vehicle to generate electromagnetic interference to the test vehicle 40. The broadcast testing device 10 is used to perform an electromagnetic interference immunity test on the broadcast receiving module 41 of the test vehicle 40.

[0076] Specifically, the main control device 20 can be set outside the test site, and the steering control software can be set inside the main control device 20. By obtaining the test standard parameters, and for each test frequency point, according to the test standard parameters, the broadcast test device 10 is controlled to activate the broadcast receiving module of the test vehicle, and the electromagnetic interference generating device 30 is controlled to perform an electromagnetic immunity test on the broadcast receiving module of the test vehicle to obtain the test results. According to the test standard parameters, the broadcast test device 10 is controlled to perform an electromagnetic immunity test on the broadcast receiving module of the test vehicle, and the actual signal-to-noise ratio parameters of each test frequency point are recorded; according to the actual signal-to-noise ratio parameters of each test frequency point and the standard signal-to-noise ratio parameters, the test results of the broadcast receiving module are determined.

[0077] In one embodiment, see Figure 3 As shown, the electromagnetic interference generating device includes: a test cavity 31, a test computer 35, a signal generator 32, a power amplifier 33, and a radio frequency antenna 34. The test computer 35 is electrically connected to the signal generator 32 and the power amplifier 33, respectively, and the radio frequency antenna 34 is located inside the test cavity 31; the power amplifier 33 is electrically connected to the signal generator 32 and the radio frequency antenna 34, respectively.

[0078] The signal generator 32 is used to: receive and respond to the control signal, generate an initial RF signal and send it to the power amplifier; the power amplifier 33 is used to: amplify the initial RF signal, obtain the amplified RF signal and send it to the RF antenna 34; the RF antenna 34 is used to: transmit the amplified RF signal into the test cavity to generate electromagnetic interference to the test vehicle; the test computer 35 is used to: generate a control signal according to preset configuration parameters and send it to the signal generator 32 and the RF antenna 34.

[0079] Specifically, the RF antenna 34 can be an omnidirectional antenna without directionality, or a directional directional antenna. An omnidirectional antenna is a 360° uniform antenna in the horizontal pattern; a directional antenna is a directional antenna that radiates within a certain angle range in the horizontal pattern. The directional antenna is generally suitable for environments with long communication distances, small coverage, high target density, and high frequency utilization.

[0080] The signal generator 32 is used to generate an initial RF signal and send it to the power amplifier, which amplifies the signal through the power amplifier 33 to obtain an amplified RF signal and send it to the RF antenna 34, so that the RF antenna 34 transmits the amplified RF signal to the test vehicle to generate electromagnetic interference to the test vehicle.

[0081] In one embodiment, see Figure 3 As shown, the broadcast test device 10 includes an audio analyzer 11 and a broadcast signal simulator 12 ; the audio analyzer 11 establishes a communication connection with the broadcast signal simulator 12 , the broadcast signal simulator 12 establishes a communication connection with the broadcast receiving module 41 , and the speaker 42 establishes a communication connection with the audio analyzer 11 .

[0082] The audio analyzer 11 is used to: output an audio signal and send it to a broadcast signal simulator; the broadcast signal simulator 12 is used to: modulate the audio signal into a broadcast signal and output it to the broadcast receiving module 41, so that the broadcast receiving module 41 processes the broadcast signal into an audio signal and plays it through the speaker 42 in the test vehicle 40; the audio analyzer 11 is also used to: receive an input signal sent by the speaker 42 and perform a signal-to-noise ratio analysis based on the input signal to obtain an actual parameter of the signal-to-noise ratio.

[0083] The electromagnetic immunity test system for the vehicle-mounted broadcast module provided in this embodiment, on the one hand, can simulate the situation in which the vehicle receives different broadcast signals during actual use by setting multiple frequency points and activating the broadcast receiving module according to the obtained test standard parameters, thereby ensuring that the broadcast receiving module can work normally under various common broadcast frequencies, and emitting electromagnetic waves to the test vehicle through the electromagnetic interference generating device, so as to simulate a more realistic electromagnetic interference environment for the test vehicle; on the other hand, after applying electromagnetic interference, the electromagnetic immunity test of the broadcast receiving module is performed through the broadcast testing device, so that the actual signal-to-noise ratio parameters of the broadcast receiving module at different frequencies can be more comprehensively and accurately evaluated, and the actual signal-to-noise ratio parameters and the signal-to-noise ratio standard parameters of each test frequency point are comprehensively considered, so as to accurately determine the test result of the vehicle-mounted broadcast receiving module, verify the adaptability of the vehicle-mounted wireless broadcast receiving module in a complex electromagnetic environment, improve the detection efficiency and accuracy of the wireless broadcast receiving module, and further improve the safety of vehicle driving.

[0084] Figure 6 FIG. 1 is a schematic diagram of the structure of a main control device provided by an embodiment of the present invention. Figure 6 As shown, it shows a structural schematic diagram of a main control device 20 suitable for implementing an embodiment of the present application.

[0085] like Figure 6 As shown, the main control device 20 includes a central processing unit (CPU) 401, which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 402 or the program loaded from the storage part 408 to the random access memory (RAM) 403. In the RAM 403, various programs and data required for system operation are also stored. The CPU 401, the ROM 402, and the RAM 403 are connected to each other through a bus 404. An input / output (I / O) interface 405 is also connected to the bus 404.

[0086] The following components are connected to the I / O interface 405: an input section 406 including a keyboard, a mouse, etc.; an output section 407 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 408 including a hard disk, etc.; and a communication section 409 including a network interface card such as a LAN card, a modem, etc. The communication section 409 performs communication processing via a network such as the Internet. A drive 410 is also connected to the I / O interface 405 as needed. A removable medium 411, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 410 as needed, so that a computer program read therefrom is installed into the storage section 408 as needed.

[0087] In particular, according to the embodiments of the present disclosure, the above reference Figure 2The described processes may be implemented as computer software programs. For example, embodiments of the present disclosure include a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program comprising a computer program for executing Figure 2 In such an embodiment, the computer program may be downloaded and installed from a network via the communication section 409 and / or installed from the removable medium 411.

[0088] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present invention. In this regard, each box in the flow chart or block diagram can represent a module, a program segment, or a part of the code, and the aforementioned module, program segment, or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0089] The units or modules involved in the embodiments described in this application may be implemented by software or hardware, and the units or modules described may also be set in a processor.

[0090] As another aspect, the present application also provides a computer-readable medium, which may be included in the processing device described in the above embodiment; or may exist independently without being assembled into the main control device. The above computer-readable medium carries one or more programs, and when the above one or more programs are executed by a main control device, the main control device implements the electromagnetic immunity test method of the vehicle-mounted broadcast module as described in the above embodiment.

[0091] As yet another aspect, the present application further provides a computer program product, including a computer program, which, when executed by a processor, implements the electromagnetic immunity testing method for the vehicle-mounted broadcast module provided in the above embodiment.

[0092] For example, the main control device can be implemented as follows Figure 2As shown in: Step S101, obtaining the test standard parameters of the broadcast receiving module in the test vehicle; the test standard parameters are used to characterize the parameter information of the test vehicle when no electromagnetic interference is applied; the broadcast receiving module includes at least one modulation mode, and each modulation mode includes multiple test frequencies; Step S102, for each test frequency, according to the test standard parameters, activate the broadcast receiving module through the broadcast test device; Step S103, control the electromagnetic interference generating device to emit electromagnetic waves to the test vehicle to generate electromagnetic interference to the test vehicle; Step S104, according to the test standard parameters, control the broadcast test device to perform an electromagnetic immunity test on the broadcast receiving module of the test vehicle, and record the actual signal-to-noise ratio parameters of each test frequency; Step S105, determine the test result of the broadcast receiving module according to the actual signal-to-noise ratio parameters of each test frequency and the signal-to-noise ratio standard parameters. For another example, the main control device can also be implemented as follows Figure 4 The steps shown in .

[0093] It should be noted that, although several modules or units of the device for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments of the present disclosure, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided into multiple modules or units to be embodied.

[0094] In addition, although the steps of the method in the present disclosure are described in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in this specific order, or that all the steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps, etc. Through the description of the above implementation, it is easy for those skilled in the art to understand that the example implementation described here can be implemented by software, or by software combined with necessary hardware.

[0095] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A method for testing electromagnetic interference immunity of a vehicle-mounted broadcast module, characterized in that: The electromagnetic interference immunity test method of the vehicle-mounted broadcast module includes: Acquire test standard parameters of a broadcast receiving module in a test vehicle; the test standard parameters refer to parameter information of the test vehicle when no electromagnetic interference is applied; the broadcast receiving module includes at least one modulation mode, and each modulation mode includes multiple test frequency points; For each test frequency point, activating the broadcast receiving module through a broadcast test device according to the test standard parameters; Controlling the electromagnetic interference generating device to emit electromagnetic waves to the test vehicle to generate electromagnetic interference to the test vehicle; According to the test standard parameters, controlling the broadcast test device to perform an electromagnetic interference immunity test on the broadcast receiving module of the test vehicle, and recording the actual signal-to-noise ratio parameters of each test frequency point; The test result of the broadcast receiving module is determined according to the actual signal-to-noise ratio parameters and the standard signal-to-noise ratio parameters of each test frequency point.

2. The method according to claim 1, characterized in that The broadcast test device comprises: an audio analyzer and a broadcast signal simulator; According to the test standard parameters, the broadcast test device is controlled to perform an electromagnetic interference immunity test on the broadcast receiving module of the test vehicle, and the actual parameters of the signal-to-noise ratio at each test frequency point are recorded, including: For each test frequency point, controlling the parameter configuration of the broadcast receiving module according to the test standard parameters; the test standard parameters include: receiver parameters and volume adjustment parameters; the receiver parameters include: FM receiver parameters or AM receiver parameters; When the parameter configuration is completed, controlling the audio analyzer to output an audio signal; Controlling the broadcast signal simulator to modulate the audio signal into a broadcast signal; outputting the broadcast signal to the broadcast receiving module so that the broadcast receiving module processes the broadcast signal into a demodulated audio signal and plays it through a speaker in the test vehicle; The audio analyzer receives an input signal sent by the loudspeaker, performs a signal-to-noise ratio analysis based on the input signal, and obtains an actual signal-to-noise ratio parameter of the test frequency point; the input signal is generated by the loudspeaker based on the demodulated audio signal.

3. The method according to claim 2, characterized in that Determining the test result of the broadcast receiving module according to the actual signal-to-noise ratio parameters and the standard signal-to-noise ratio parameters of each test frequency point includes: For each modulation mode, the actual signal-to-noise ratio parameter corresponding to each test frequency point is compared with the standard signal-to-noise ratio parameter to obtain a sub-test result corresponding to the modulation mode; the sub-test result includes a test pass and a test fail; When all sub-test results are tested to be passed, determining that the test result of the broadcast receiving module is tested to be passed; When there is a test failure in all the sub-test results, it is determined that the test result of the broadcast receiving module is a test failure.

4. The method according to claim 3, characterized in that For each modulation mode, the actual signal-to-noise ratio parameter corresponding to each test frequency point is compared with the standard signal-to-noise ratio parameter to obtain the sub-test result corresponding to the modulation mode, including: When the actual signal-to-noise ratio parameters corresponding to all test frequency points are not less than the standard signal-to-noise ratio parameters, the subtest result corresponding to the modulation mode is determined to be a test pass; When the corresponding actual signal-to-noise ratio parameter in all test frequency points is less than the standard signal-to-noise ratio parameter, it is determined that the sub-test result corresponding to the modulation mode is a test failure.

5. The method according to claim 2, characterized in that: Performing a signal-to-noise ratio analysis on the input signal to obtain actual parameters of the signal-to-noise ratio at the test frequency point includes: Performing noise analysis on the input signal to determine the signal power and noise power of the input signal; An actual parameter of the signal-to-noise ratio of the test frequency point is obtained according to the signal power and the noise power.

6. The method according to claim 1, characterized in that Controlling the electromagnetic interference generating device to emit electromagnetic waves to the test vehicle to generate electromagnetic interference to the test vehicle includes: According to preset configuration parameters of the electromagnetic interference generating device, controlling parameter configuration of the electromagnetic interference generating device; Controlling the signal generator in the electromagnetic interference generating device that has completed parameter configuration to generate an initial radio frequency signal; According to the electric field strength value calibrated at the test site where the test vehicle is located, controlling the power amplifier in the electromagnetic interference generating device to amplify the initial radio frequency signal; The radio frequency antenna in the electromagnetic interference generating device is controlled to transmit the amplified radio frequency signal to the test vehicle to generate electromagnetic interference to the test vehicle.

7. A vehicle-mounted broadcast module electromagnetic immunity test system, characterized in that: include: A broadcast test device, a main control device, and an electromagnetic interference generating device; the main control device establishes communication connections with the broadcast test device and the electromagnetic interference generating device respectively; the broadcast test device establishes communication connection with a broadcast receiving module in the test vehicle; The main control device is used to: obtain the test standard parameters of the broadcast receiving module in the test vehicle; the broadcast receiving module includes at least one modulation mode, and each modulation mode includes multiple test frequencies; for each test frequency, according to the test standard parameters, activate the broadcast receiving module through the broadcast testing device; control the electromagnetic interference generating device to emit electromagnetic waves to the test vehicle to generate electromagnetic interference to the test vehicle; according to the test standard parameters, control the broadcast testing device to perform electromagnetic immunity test on the broadcast receiving module of the test vehicle, and record the actual signal-to-noise ratio parameters of each test frequency; determine the test result of the broadcast receiving module according to the actual signal-to-noise ratio parameters of each test frequency and the signal-to-noise ratio standard parameters; the test standard parameters refer to the parameter information of the test vehicle when no electromagnetic interference is applied; The electromagnetic interference generating device is used to: emit electromagnetic waves to the test vehicle to generate electromagnetic interference to the test vehicle; The broadcast testing device is used to perform an electromagnetic interference immunity test on the broadcast receiving module of the test vehicle.

8. The system according to claim 7, characterized in that The broadcast test device includes an audio analyzer and a broadcast signal simulator; the audio analyzer establishes a communication connection with the broadcast signal simulator; the broadcast signal simulator establishes a communication connection with the broadcast receiving module, and the speaker establishes a communication connection with the audio analyzer; The audio analyzer is used to: output an audio signal and send it to the broadcast signal simulator; The broadcast signal simulator is used to: modulate the audio signal into a broadcast signal and output it to the broadcast receiving module, so that the broadcast receiving module processes the broadcast signal into a demodulated audio signal and plays it through a speaker in the test vehicle; The audio analyzer is also used to: receive an input signal sent by the loudspeaker and perform signal-to-noise ratio analysis according to the input signal to obtain an actual parameter of the signal-to-noise ratio; the input signal is generated by the loudspeaker according to the demodulated audio signal.

9. A main control device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the electromagnetic immunity test method for a vehicle-mounted broadcast module as claimed in any one of claims 1 to 6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the electromagnetic interference immunity testing method of the vehicle-mounted broadcast module described in any one of claims 1 to 6 is implemented.

Images