Automobile 4g receiving sensitivity test method and system

Abstract

The application provides a kind of automobile 4G receiving sensitivity test method and system, comprising: based on the EIS test value of test point position obtained by preset test sequence acquisition, and according to the EIS value, TIS value is calculated;With the TIS value corresponding to the reference EIS test value set as the basis value, the TIS value tested based on the default value is subtracted from the basis value to obtain the TIS deviation value;The TIS deviation value is compared with the preset deviation threshold value, and in response to the TIS deviation value exceeding the deviation threshold value, the test is stopped.The application takes the conventional test value as a reference, when the number of abnormal data exceeds a certain limit value, it is considered that the final TIS result deviation is large, and the test can be stopped, thereby saving test time and greatly improving test efficiency.

Description

Technical Field

[0001] This application belongs to the field of vehicle communication testing technology, and in particular relates to a method and system for testing the sensitivity of 4G receivers in automobiles. Background Technology

[0002] As the automotive industry rapidly evolves towards intelligence and connectivity, traditional 2G and 3G vehicle communication technologies, with their low transmission rates and weak capacity, can only achieve basic positioning and simple communication, failing to meet the demands of developing intelligent vehicle services. The full commercialization and widespread coverage of 4G communication networks in China, coupled with the continuous reduction in the cost of vehicle communication hardware, has created favorable conditions for the development of high-speed vehicle networking. Driven by market demand, functions such as remote vehicle monitoring, intelligent vehicle services, vehicle fault diagnosis, and remote upgrades are rapidly becoming widespread. Automakers are gradually equipping large numbers of vehicles with 4G vehicle communication devices, leveraging their stable and efficient transmission capabilities to build vehicle networking systems, greatly expanding intelligent vehicle application scenarios and driving the transformation of vehicles into intelligent mobile terminals.

[0003] Currently, third-party automotive testing agencies typically use a spherical near-field anechoic chamber to conduct automotive 4G receiver sensitivity tests. First, the vehicle is placed stably on the test turntable in the center of the chamber. The vehicle's communication terminal is debugged and put into normal 4G reception operation. A standard 4G test signal is transmitted through a near-field radiating antenna. The transmitted signal power is gradually adjusted, and the vehicle's stable and normal reception of the demodulated signal is used as the criterion. The transmitted signal strength is continuously reduced until the onboard 4G terminal exhibits a bit error rate greater than 5%, and the critical signal value at this point is accurately recorded. During the vehicle receiver sensitivity test, the elevation angles are 0°, 30°, 60°, and 90°, and the azimuth angles are 0° to 330°, spaced at 30° intervals, for a total of 12 angles. After obtaining the values ​​for all points in the upper hemisphere of the vehicle, the receiver sensitivity is calculated. However, current automotive 4G receiver sensitivity tests often have the following problems: (1) In a normal receiver sensitivity test, the standard 4G test signal will gradually decrease the transmit signal power until the terminal demodulated signal bit error rate is greater than 5%. The test time for a single point is about 2 to 4 minutes. According to the standard requirements, the receiver sensitivity of a vehicle needs to be collected at 37 points, so the test time for a vehicle is about 1.5 to 2.5 hours. Considering the high unit price of the test, it is easy to cause the problem of high test cost.

[0004] (2) The transmission and reception of 4G signals in automobiles are directional. Considering factors such as 4G antenna gain design, spatial attenuation, terminal installation location, shielding effect of the vehicle's metal structure, and reflection effect, the transmission intensity of the 4G antenna is not consistent in each direction. In the direction with better signal strength, the test speed at that point is faster. In the direction with poor signal strength, if the comprehensive test instrument (CMW500) cannot obtain the EIS of that point for a long time, it will automatically give a default value and start testing the next point. This will lead to excessively long test time, and the default value given is an abnormal value, which will cause the test results to deviate from the actual value, or even have a large deviation. Summary of the Invention

[0005] In view of this, this application aims to provide a method and system for testing the sensitivity of 4G receivers in automobiles, in order to solve at least one of the above-mentioned problems.

[0006] To achieve the above objectives, the technical solution of this application is implemented as follows: Firstly, this application provides a method for testing the sensitivity of a car's 4G receiver, including: The EIS test values ​​of the test points are collected based on the preset test sequence, and the TIS values ​​are calculated based on the EIS values. The TIS value corresponding to the set reference EIS test value is used as the base value. The difference between the TIS value obtained based on the default value and the base value is used to obtain the TIS deviation value. The TIS deviation value is compared with a preset deviation threshold. If the TIS deviation value exceeds the deviation threshold, the test is terminated.

[0007] Secondly, based on the same inventive concept, this application also provides a 4G receiver sensitivity testing system for automobiles, comprising: The test data acquisition module is configured to acquire EIS test values ​​of test points based on a preset test sequence, and calculate TIS values ​​based on the EIS values. The TIS deviation determination module is configured to take the TIS value corresponding to the set reference EIS test value as the base value, and subtract the base value from the TIS value obtained based on the default value to obtain the TIS deviation value. The TIS deviation comparison module is configured to compare the TIS deviation value with a preset deviation threshold, and to terminate the test in response to the TIS deviation value exceeding the deviation threshold.

[0008] Thirdly, based on the same inventive concept, this application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method described in the first aspect.

[0009] Fourthly, based on the same inventive concept, this application also provides a non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores computer instructions for causing the computer to perform the method as described in the first aspect.

[0010] Compared with existing technologies, the automotive 4G receiver sensitivity testing method and system described in this application have the following advantages: This application monitors abnormal EIS values ​​in real time and uses regular test values ​​as a reference. When the number of abnormal data exceeds a certain limit, the final TIS result is considered to have a large deviation, and the test can be stopped. The staff should check the test system or the vehicle under test to find out the cause of the abnormality. In practice, it can effectively save 1 / 3 of the test time and greatly improve the test efficiency. Attached Figure Description

[0011] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a flowchart of a method for testing the sensitivity of a car's 4G receiver, as described in an embodiment of this application. Figure 2 This is a schematic diagram of the structure of a car 4G receiver sensitivity testing system according to an embodiment of this application; Figure 3 This is a schematic diagram of the hardware structure of the electronic device described in an embodiment of this application. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0013] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0014] According to standards and specifications such as 5GAA and 3GPP, automotive 4G communication systems need to undergo UHIS testing in a fully anechoic chamber. The test typically uses the spherical near-field method, where a measuring probe measures the 4G signal power strength at a specified location. The measuring probe is of the dual-polarization type and is usually specified as... (Pitch angle) polarization and (Azimuth) polarization, polarization and The EIS value at a given location is obtained by summing the power values ​​measured by polarization, and finally, the UHIS (Upper Hemisphere Omnidirectional Sensitivity) is calculated using a formula. During the test, the system displays the EIS values ​​at each location in real time in the test window. UHIS testing typically takes a long time, and due to the test angle, communication between the test system and the vehicle at that point is often poor, leading to test failure. The comprehensive tester cannot obtain accurate results and can only provide a default value (-68dBm), which is usually much larger than the actual value. This not only results in excessively long test times but also raises questions about the accuracy of the final calculated result.

[0015] The embodiments of this application are described in detail below with reference to the accompanying drawings.

[0016] Please see Figure 1 As shown, this embodiment provides a method for testing the sensitivity of a car's 4G receiver, which specifically includes the following steps: Step S101: Collect the EIS test values ​​of the test points based on the preset test sequence, and calculate the TIS value based on the EIS value.

[0017] Step S102: Take the TIS value corresponding to the set reference EIS test value as the base value, and calculate the difference between the TIS value obtained based on the default value and the base value to obtain the TIS deviation value.

[0018] Step S103: Compare the TIS deviation value with the preset deviation threshold. If the TIS deviation value exceeds the deviation threshold, the test is terminated.

[0019] This application monitors abnormal EIS values ​​in real time and uses regular test values ​​as a reference. When the number of abnormal data exceeds a certain limit, the final TIS result is considered to have a large deviation, and the test can be stopped. The staff should check the test system or the vehicle under test to find out the cause of the abnormality. In practice, it can effectively save 1 / 3 of the test time and greatly improve the test efficiency.

[0020] Specifically, in this embodiment, as described above, a certain point of EIS is determined by... polarization and The polarization power values ​​are summed to obtain the result. The test system typically provides EIS at 37 points, as shown in Table 1 below. Considering that 4G EIS test values ​​are typically between -95dBm and -105dBm, this application uses a typical value of -100dBm as a reference value.

[0021] Table 1 Typical 4G EIS Test Values The TIS value in Table 1 is calculated to be -96.89 dBm using the following formula: The calculation process for the TIS value is as follows: ; in, This represents the weighted sum of each horizontal cross-section. ; In the formula, This represents the effective omnidirectional sensitivity under unidirectional, vertical polarization. This represents the effective omnidirectional sensitivity under unidirectional, horizontal polarization. Indicates the angle between the measured object and the positive X-axis; , This indicates the number of sampling points in the horizontal and vertical directions.

[0022] During actual testing, due to various factors, the CMW500 tester could not measure the true EIS value for every location. In this case, the CMW500 tester would give a default value of -68dBm, which obviously affects the final result. When one and two default values ​​appeared respectively, the final TIS values ​​given by the system were -96.79dBm and -96.69dBm. Considering all cases, when the default value appeared 0 to 37 times, i.e., at the set location ( , The default values ​​appear sequentially from (0, 0), (30, 0), (30, 30), (30, 60) up to (90, 330), and the TIS calculation results are shown in Table 2.

[0023] Table 2 TIS Value Table Using all the measured reference EIS test values ​​corresponding to the TIS values ​​(i.e., the default value of 0), as the base value, calculate the number of different default values ​​respectively. The difference between the TIS value and the baseline value under the given conditions is shown in Table 3.

[0024] Table 3 TIS Difference Table Clearly, as the number of default values ​​increases, the difference also increases. Considering the current industry situation, this embodiment sets the TIS test deviation to no more than 1dB. When there are 11 default values, the deviation is 1.1dB, which exceeds the industry allowable range. Therefore, it can be considered that the TIS value obtained in this case has a large deviation, and continuing the test is meaningless; the test should be stopped.

[0025] In addition, considering that the EIS value needs to be compared with... To multiply, in When the angle is 0°, 30°, 60°, and 90°, the values ​​of sinθ are 0, 0.5, 0.866, and 1, respectively. According to the above formula, when... hour, The coefficient exists at 1 / 2. Therefore, considering all factors, each... The coefficients for the angles are 0, 0.5, 0.866, and 0.5, respectively.

[0026] The comprehensive coefficient shows that, The coefficient is largest at time. Therefore, when The default value has the greatest impact on the final result. Following traditional testing methods, the test order is as follows: , , , To save testing time more effectively, the testing order can be changed to the following sequence: , , , .

[0027] In this case, the TIS differences are shown in Table 4.

[0028] Table 4 TIS Difference Table Clearly, the table shows that when the default value occurs 6 times, the TIS difference exceeds 1 dB. At this point, the test results can be considered unreliable, and the test should be stopped. By changing the test order, the new method stops the test after the default value occurs 6 times, which is much more efficient than the traditional method's 11 times. Considering practical situations, vehicle testing usually takes place within... , An anomaly occurred because when in , At times, the metal body of the vehicle severely obstructs the view, resulting in poor connectivity between the vehicle and the base station and a tendency for disconnections to occur. In such cases, the system will provide a default value, affecting the accuracy of the test results. This method is highly feasible.

[0029] It should be noted that the above description describes some embodiments of this application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in a different order than that shown in the above embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0030] Based on the same inventive concept, and corresponding to the methods of any of the above embodiments, the embodiments of this application also provide a vehicle 4G receiver sensitivity testing system.

[0031] like Figure 2 As shown, the automotive 4G receiver sensitivity testing system includes: The test data acquisition module is configured to acquire EIS test values ​​of test points based on a preset test sequence, and calculate TIS values ​​based on the EIS values. The TIS deviation determination module is configured to take the TIS value corresponding to the set reference EIS test value as the base value, and subtract the base value from the TIS value obtained based on the default value to obtain the TIS deviation value. The TIS deviation comparison module is configured to compare the TIS deviation value with a preset deviation threshold, and to terminate the test in response to the TIS deviation value exceeding the deviation threshold.

[0032] For ease of description, the above system is described by dividing it into various modules based on their functions. Of course, in implementing the embodiments of this application, the functions of each module can be implemented in one or more software and / or hardware.

[0033] The system described in the above embodiments is used to implement the corresponding method in any of the foregoing embodiments and has the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0034] Based on the same inventive concept, corresponding to the methods of any of the above embodiments, embodiments of this application also provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the methods described in any of the above embodiments.

[0035] Figure 3This embodiment illustrates a more specific hardware structure of an electronic device, which may include a processor 1010, a memory 1020, an input / output interface 1030, a communication interface 1040, and a bus 1050. The processor 1010, memory 1020, input / output interface 1030, and communication interface 1040 are interconnected internally via the bus 1050.

[0036] The processor 1010 can be implemented using a general-purpose CPU (Central Processing Unit), microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this specification.

[0037] The memory 1020 can be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory), static storage device, dynamic storage device, etc. The memory 1020 can store the operating system and other applications. When the technical solutions provided in the embodiments of this specification are implemented by software or firmware, the relevant program code is stored in the memory 1020 and is called and executed by the processor 1010.

[0038] The input / output interface 1030 is used to connect input / output modules to realize information input and output. The input / output modules can be configured as components in the device (not shown in the figure) or externally connected to the device to provide corresponding functions. Input devices may include keyboards, mice, touch screens, microphones, various sensors, etc., and output devices may include displays, speakers, vibrators, indicator lights, etc.

[0039] The communication interface 1040 is used to connect a communication module (not shown in the figure) to enable communication between this device and other devices. The communication module can communicate via wired means (such as USB, Ethernet cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.).

[0040] Bus 1050 includes a pathway for transmitting information between various components of the device, such as processor 1010, memory 1020, input / output interface 1030, and communication interface 1040.

[0041] It should be noted that although the above-described device only shows the processor 1010, memory 1020, input / output interface 1030, communication interface 1040, and bus 1050, in specific implementations, the device may also include other components necessary for normal operation. Furthermore, those skilled in the art will understand that the above-described device may only include the components necessary for implementing the embodiments of this specification, and not necessarily all the components shown in the figures.

[0042] The electronic devices described above are used to implement the corresponding methods in any of the foregoing embodiments and have the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0043] Based on the same inventive concept, corresponding to the methods of any of the above embodiments, this application also provides a non-transitory computer-readable storage medium that stores computer instructions for causing the computer to perform the methods described in any of the above embodiments.

[0044] The computer-readable medium of this embodiment includes permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device.

[0045] The computer instructions stored in the storage medium of the above embodiments are used to cause the computer to perform the methods described in any of the above embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0046] Although this application has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may be used with the embodiments discussed.

[0047] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the claims of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A method for testing the sensitivity of a car's 4G receiver, characterized in that, include: The EIS test values ​​of the test points are collected based on the preset test sequence, and the TIS values ​​are calculated based on the EIS values. The TIS value corresponding to the set reference EIS test value is used as the base value. The difference between the TIS value obtained based on the default value and the base value is used to obtain the TIS deviation value. The TIS deviation value is compared with a preset deviation threshold. If the TIS deviation value exceeds the deviation threshold, the test is terminated.

2. The method according to claim 1, characterized in that: The preset test order is as follows: , , , , This indicates the angle between the sampling direction and the positive Z-axis of the spherical coordinate system.

3. The method according to claim 1, characterized in that, The calculation process for the TIS value is as follows: ； in, This represents the weighted sum of each horizontal cross-section. ; In the formula, This represents the effective omnidirectional sensitivity under unidirectional, vertical polarization. This represents the effective omnidirectional sensitivity under unidirectional, horizontal polarization. Indicates the angle between the measured object and the positive X-axis; , This indicates the number of sampling points in the horizontal and vertical directions.

4. The method according to claim 1, characterized in that: The reference EIS test value is set to 100dBm, and the TIS value corresponding to 100dBm is used as the base value.

5. The method according to claim 1, characterized in that: The default value is set to -68dBm.

6. The method according to claim 1, characterized in that: The deviation threshold is set to 1 dB.

7. A 4G receiver sensitivity testing system for automobiles, characterized in that, include: The test data acquisition module is configured to acquire EIS test values ​​of test points based on a preset test sequence, and calculate TIS values ​​based on the EIS values. The TIS deviation determination module is configured to take the TIS value corresponding to the set reference EIS test value as the base value, and subtract the base value from the TIS value obtained based on the default value to obtain the TIS deviation value. The TIS deviation comparison module is configured to compare the TIS deviation value with a preset deviation threshold, and to terminate the test if the TIS deviation value exceeds the deviation threshold.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the method as described in any one of claims 1-6.

9. A non-transitory computer-readable storage medium, characterized in that, in, The non-transitory computer-readable storage medium stores computer instructions for causing a computer to perform the method described in any one of claims 1-6.

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