A test system and method for testing the radio frequency interference immunity of train vehicle equipment

Abstract

This invention discloses a system and method for testing the radio frequency interference (RFI) immunity performance of train vehicle equipment. The system includes a test terminal, a mobile terminal, an adjustable bracket, an antenna, and a field strength probe. The mobile terminal houses a power supply and an immunity signal generator. The power supply powers the test terminal and the immunity signal generator, and the immunity signal generator generates and amplifies the RF modulation signal. The test terminal is located on one side of the top of the mobile terminal. This system and method for testing the RFI immunity performance of train vehicle equipment utilizes a mobile terminal connected to the test terminal, antenna, field strength probe, and immunity signal generator to perform RFI immunity testing. The immunity signal generator simulates the RF interference environment, eliminating the need for an anechoic chamber. Testing can be conducted directly within the train carriages after the train assembly is completed and all functions are properly debugged, improving the overall mobility and portability of the testing system.

Description

Technical Field

[0001] This invention relates to a test system and method for testing the radio frequency interference resistance of train vehicle equipment, belonging to the fields of electromagnetic compatibility and radio frequency technology. Background Technology

[0002] With the rapid development of mobile communication, train vehicles encounter various radio frequency transmitters during actual operation, such as mobile radio frequency devices carried by passengers, including mobile phones, walkie-talkies, wireless remote controls, smartwatches, and smart robots. These radio frequency transmitters can come into very close proximity to or into contact with electronic devices inside the carriage, such as emergency call devices in the toilets, electronic sensors at the carriage doors, smoke detectors, voice broadcasting systems, and power or braking systems. Radio frequency interference generated by these mobile radio frequency transmitters may affect the normal operation of these electronic systems or devices in the vehicle, and false alarms may occur, affecting the normal operation of the train.

[0003] Currently, while routine radio frequency radiation immunity tests are conducted on train components in a laboratory environment, there is no suitable testing method to evaluate the system's immunity to radio frequency interference when all systems are connected. Current testing of the entire train car only includes measurement devices and evaluation methods for external interference immunity. The vehicle's shell is mostly made of metal, which provides some protection for electronic devices installed inside the car. Furthermore, due to limitations in the testing environment and the size of the testing equipment, a standard testing environment cannot be established inside the train car.

[0004] Therefore, in order to solve the above-mentioned technical problems, there is an urgent need for a test system and method for testing the radio frequency interference resistance of train vehicle equipment. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a test system and method for the anti-radio frequency interference performance of train vehicle equipment. The method uses a mobile terminal to connect to the test terminal, antenna, field strength probe and immunity signal generator to conduct the anti-radio frequency interference test. The immunity signal generator simulates the radio frequency interference environment. It does not need to be carried out in an anechoic chamber environment. The test can be carried out directly in the train carriage after the train is fully assembled and the functions of each part are debugged and perfected, which improves the overall mobility and portability of the test system.

[0006] To achieve the above objectives / to solve the above technical problems, the present invention is implemented using the following technical solution:

[0007] In a first aspect, the present invention provides a testing system for the radio frequency interference immunity performance of train vehicle equipment, comprising a test terminal, a mobile terminal, an adjustable bracket, an antenna, and a field strength probe, wherein...

[0008] The mobile terminal is equipped with a power supply and an immunity signal generator. The power supply is used to power the test terminal and the immunity signal generator, and the immunity signal generator is used to generate and amplify radio frequency modulation signals.

[0009] The test terminal is located on one side of the top of the mobile terminal and is connected to the signal of the anti-interference signal generator.

[0010] The antenna is located on the other side of the top of the mobile terminal and is connected to the anti-interference signal generator.

[0011] The field strength probe is connected to the test terminal for measuring the field strength generated by the antenna and transmitting the measured data to the test terminal.

[0012] Furthermore, the distance between the field strength probe and the antenna is 5 cm.

[0013] Furthermore, the radio frequency interference modulation signal generated by the antenna is 26MHz-6GHz.

[0014] Furthermore, it also includes an adjustable bracket, which is fixed to the other side of the top of the mobile terminal to support the antenna.

[0015] In a second aspect, the present invention provides a method for testing the radio frequency interference immunity performance of train vehicle equipment as described in the first aspect, comprising the following steps:

[0016] Place the field strength probe 5cm away from the antenna, set the test frequency range and target level in the automation software of the test terminal, and turn on the immunity signal generator.

[0017] Perform software calibration and, based on the preset amplitude of the first frequency point output by the immunity signal generator, execute the output signal adjustment steps of the immunity signal generator.

[0018] Adjust to the next frequency point, cycle through the noise immunity signal generator output signal adjustment steps until the measurement frequency covers 26MHz to 6GHz;

[0019] Turn on the vehicle's internal electronic devices and the vehicle signal monitoring system to ensure that the electronic devices can connect normally and are functioning properly.

[0020] Remove the field strength probe, adjust the antenna position using the adjustable bracket, and place it 5cm away from the vehicle's sensitive device. Divide the sensitive area into a grid and place the antenna at the edge of the grid.

[0021] The antenna polarization test is performed by calling the calibration parameters through the automatic test software, in which the antenna generates radio frequency interference modulation signals of 26MHz-6GHz;

[0022] Move the antenna position and repeat the antenna polarization test steps until all grids of the sensitive area are covered, then record the overall test results;

[0023] The antenna is moved to the next sensitive electronic device area for antenna polarization testing until testing is completed for all sensitive devices within the carriage.

[0024] Furthermore, the step of adjusting the output signal of the immunity signal generator includes:

[0025] The actual field strength is measured by the field strength probe, and the field strength at the distance to the target is calculated by the software.

[0026] Based on the distance to the target field strength value, the output signal is adjusted according to the rule parameters until the field strength probe measurement value reaches the target field strength range, and the output power of the immunity signal generator is recorded.

[0027] Furthermore, the antenna polarization test step includes:

[0028] Observe the status of the electronic device monitoring system and record any abnormalities promptly.

[0029] If the electronic device outputs abnormally during the test, the test can be paused. The output of the radio frequency immunity signal generator can be adjusted to reduce the power output to see if the abnormal situation can be recovered. If it can be recovered, the critical interference value can be recorded.

[0030] If the electronic device is working properly, the test for this region under this polarization is passed.

[0031] Rotate the antenna to polarize by 90 degrees and repeat the above steps to complete the second polarization test.

[0032] Furthermore, the antenna polarization test level is 30V / m.

[0033] Furthermore, the first / second polarization test includes a vertical / horizontal polarization test.

[0034] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0035] The radio frequency interference performance testing system for train vehicle equipment provided by this invention uses a mobile terminal to connect to a test terminal, antenna, field strength probe and immunity signal generator to conduct radio frequency interference tests. The immunity signal generator simulates the radio frequency interference environment, which does not require an anechoic chamber environment. The test can be carried out directly in the train carriage after the train is fully assembled and the functions of each part are debugged and perfected, which improves the overall mobility and portability of the testing system.

[0036] The train vehicle equipment radio frequency interference performance testing system provided by the present invention adjusts the position of the antenna by setting an adjustable bracket to complete the required grid range. At the same time, the antenna is a small-sized antenna, which can freely enter and exit the carriage compared with the existing low-frequency transmitting antenna.

[0037] The method for testing the radio frequency interference performance of train vehicle equipment provided by the present invention uses a test terminal to control the operation of a radio frequency transmitter that generates a constant electromagnetic field at different frequencies to simulate the working state. It observes whether there are any abnormal alarms or actions in the corresponding electronic system, records them, and synchronizes them with the test location. At the same time, a grid method is used to compensate for the risk of missing tests in sensitive areas of the vehicle due to the small antenna size. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the radio frequency interference immunity test system for train vehicle equipment provided in Embodiment 1;

[0039] Figure 2 It is a diagram of the antenna's radiation field strength;

[0040] Figure 3 This is a schematic diagram of the antenna direction;

[0041] Figure 4 It is a grid diagram showing the antenna coverage of train vehicles.

[0042] In the diagram: 1. Test terminal; 2. Mobile terminal; 3. Adjustable bracket; 4. Antenna; 5. Field strength probe; 6. Power supply; 7. Immunity signal generator. Detailed Implementation

[0043] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0044] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances. Example 1

[0046] This embodiment provides a test system for the radio frequency interference immunity of train vehicle equipment, including a test terminal 1, a mobile terminal 2, an adjustable bracket 3, an antenna 4, and a field strength probe 5.

[0047] The mobile terminal 2 is equipped with a power supply 6 and an immunity signal generator 7. The power supply 6 is used to supply power to the test terminal 1 and the immunity signal generator 7. The immunity signal generator 7 is used to generate and amplify radio frequency modulation signals.

[0048] The test terminal 1 is located on one side of the top of the mobile terminal 2 and is connected to the interference immunity signal generator 7.

[0049] The adjustable bracket 3 is fixed to the other side of the top of the mobile end 2 to support the antenna 4, and the antenna 4 is connected to the anti-interference signal generator 7.

[0050] The field strength probe 5 is signal-connected to the test terminal 1 and is used to measure the field strength generated by the antenna 4 and transmit the measured data to the test terminal 1.

[0051] In the above technical solution, the anti-radio frequency interference test is carried out by using a mobile terminal 2 to connect to the test terminal 1, antenna 4, field strength probe 5 and immunity signal generator 7. The immunity signal generator 7 simulates the radio frequency interference environment, which does not need to be carried out in an anechoic chamber environment. The test can be carried out directly in the train carriage after the train is fully assembled and the functions of each part are debugged and perfected, which improves the overall mobility and portability of the test system.

[0052] The position of the antenna 4 can be adjusted by setting an adjustable bracket 3 to complete the required grid range. At the same time, the antenna 4 is a small-sized antenna, which can freely enter and exit the carriage compared to the existing low-frequency transmitting antenna.

[0053] In this embodiment, the distance between the field strength probe 5 and the antenna 4 is 5cm to generate a relatively uniform interference field strength, which has better regional uniformity than that generated by a large-sized antenna.

[0054] In this embodiment, the radio frequency interference modulation signal generated by the antenna 4 is 26MHz-6GHz to match the frequency range of the current wireless device spectrum distribution. Example

[0055] This embodiment provides a method for testing the radio frequency interference immunity performance of train vehicle equipment as described in Embodiment 1, including the following steps:

[0056] Antenna 4 is mounted on an adjustable support frame, and immunity signal generator 7 is connected to antenna 4. Test terminal 1 is connected to test instrument via control line, and field strength probe 5 is connected to the automation software in test terminal 1. The automation software is matched with immunity signal generator 7 and is mainly used to control immunity signal generator 7 to generate interference signals of specified frequency and amplitude. It can set the test time for each frequency point and automatically switch frequency and amplitude adjustment within the frequency range, such as AutoLab.

[0057] Place the field strength probe 5 5 cm away from the antenna 4, set the test frequency range and target level of the automation software in the test terminal 1, and turn on the immunity signal generator 7.

[0058] Perform software calibration and, based on the preset amplitude of the first frequency point output by the immunity signal generator, execute the output signal adjustment steps of immunity signal generator 7.

[0059] Adjust to the next frequency point, cycle through the output signal adjustment steps of the immunity signal generator 7 until the measurement frequency covers 26MHz to 6GHz;

[0060] Turn on the vehicle's internal electronic devices and the vehicle signal monitoring system to ensure that the electronic devices can connect normally and are functioning properly.

[0061] Remove the field strength probe 5, adjust the position of the antenna 4 using the adjustable bracket 3, and place it at a distance of 5cm from the vehicle's sensitive device. Divide the sensitive area into regions using a grid method.

[0062] After completing the area division, place antenna 4 at the edge of the grid, such as... Figure 4 As shown;

[0063] The calibration parameters are called through the automatic test software to perform the antenna polarization test, in which antenna 4 generates a radio frequency interference modulation signal of 26MHz-6GHz;

[0064] Move the antenna to position 4 and cycle through the antenna polarization test steps until all grids of the sensitive area are covered, then record the overall test results;

[0065] Move antenna 4 to the next sensitive electronic device area (i.e., sensitive to radio frequency interference) to perform antenna polarization testing, until the testing of all sensitive devices in the carriage is completed.

[0066] To adjust the output signal of the immunity signal generator 7, the adjustment steps for the output signal of the immunity signal generator 7 include:

[0067] The actual field strength of antenna 4 is measured by field strength probe 5, and the value of the field strength at the distance to the target is calculated by software.

[0068] Based on the distance to the target field strength value, the output signal is adjusted according to the rule parameters until the measured value of the field strength probe 5 reaches the target field strength range, and the output power of the anti-interference signal generator is recorded.

[0069] To perform antenna polarization testing, the antenna polarization testing steps include:

[0070] Observe the status of the electronic device monitoring system and record any abnormalities promptly.

[0071] If the electronic device outputs abnormally during the test, the test can be paused. The output of the radio frequency immunity signal generator 7 can be adjusted to reduce the power output. The abnormal situation can be observed to see if it can be recovered. If it can be recovered, the critical interference value can be recorded.

[0072] If the electronic device is functioning normally, the electronic device in this area will pass the antenna polarization test.

[0073] Rotate the antenna 4 polarization by 90 degrees, such as Figure 3 As shown, repeat the above steps to complete the second polarization test.

[0074] In this embodiment, the antenna polarization test level is 30V / m.

[0075] In this embodiment, the first / second polarization test includes a vertical / horizontal polarization test.

[0076] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A system for testing the radio frequency interference immunity of train vehicle equipment, characterized in that, The test includes a test terminal (1), a mobile terminal (2), an antenna (4), and a field strength probe (5), among which, The mobile terminal (2) is equipped with a power supply (6) and an immunity signal generator (7). The power supply (6) is used to supply power to the test terminal (1) and the immunity signal generator (7). The immunity signal generator (7) is used to generate and amplify radio frequency modulation signals. The test terminal (1) is located on one side of the top of the mobile terminal (2) and is connected to the anti-interference signal generator (7) via signal. The antenna (4) is located on the other side of the top of the mobile terminal (2) and is connected to the anti-interference signal generator (7) via signal connection. The field strength probe (5) is signal-connected to the test terminal (1) and is used to measure the field strength generated by the antenna (4) and transmit the measured data to the test terminal (1). The distance between the field strength probe (5) and the antenna (4) is 5cm; The radio frequency interference modulation signal generated by the antenna (4) is 26MHz-6GHz; It also includes an adjustable bracket (3), which is fixed to the other side of the top of the mobile end (2) to support the antenna (4).

2. A method for testing the radio frequency interference immunity performance of train vehicle equipment, used in the radio frequency interference immunity performance testing system of train vehicle equipment as described in claim 1, characterized in that, include: Place the field strength probe (5) 5cm away from the antenna (4), set the test frequency range and target level of the automation software in the test terminal (1), and turn on the immunity signal generator (7). Perform software calibration, and according to the preset amplitude of the first frequency point output by the immunity signal generator, perform the output signal adjustment step of immunity signal generator (7); Adjust to the next frequency point, cycle through the noise immunity signal generator (7) output signal adjustment steps until the measurement frequency covers 26MHz to 6GHz; Remove the field strength probe (5), adjust the position of the antenna (4) by adjusting the bracket (3), place it 5cm away from the vehicle's sensitive device, divide the sensitive area into a grid, place it at the edge of the grid, and the vehicle's internal electronic devices and signal monitoring system are in normal working condition. The calibration parameters are called through automated testing software to perform antenna polarization testing, in which antenna (4) generates RF interference modulation signals of 26MHz-6GHz; Move the antenna (4) position, cycle through the antenna polarization test steps until all grids of the sensitive area are covered, and then record the overall test results; Move the antenna (4) to the next sensitive electronic device area to perform antenna polarization testing until the testing of all sensitive devices in the carriage is completed.

3. The method for testing the radio frequency interference immunity of train vehicle equipment according to claim 2, characterized in that, The output signal adjustment steps of the immunity signal generator (7) include: The actual field strength is measured by the field strength probe (5), and the value of the field strength at the distance from the target is calculated by the software; Based on the target field strength value, the output signal is adjusted according to the rule parameters until the field strength probe (5) reaches the target field strength range, and the output power of the anti-interference signal generator is recorded.

4. The method for testing the radio frequency interference immunity of train vehicle equipment according to claim 2, characterized in that, The antenna polarization test steps include: Observe the status of the electronic device monitoring system and record any abnormalities promptly. If the electronic device outputs abnormally during the test, pause the test, adjust the output of the radio frequency immunity signal generator (7) to reduce the power output, and see if the abnormal situation can be recovered. If it can be recovered, record the critical interference value. If the electronic device is working properly, the test for this region under this polarization is passed. Rotate the antenna (4) to polarize it by 90 degrees, repeat the above steps, and complete the second polarization test.

5. The method for testing the radio frequency interference immunity of train vehicle equipment according to claim 4, characterized in that, The antenna polarization test level is 30V / m.

6. The method for testing the radio frequency interference immunity of train vehicle equipment according to claim 4, characterized in that, The first / second polarization test includes vertical / horizontal polarization testing.

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