CN110967569A - Test system and vehicle test method - Google Patents
Test system and vehicle test method Download PDFInfo
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- CN110967569A CN110967569A CN201811160608.5A CN201811160608A CN110967569A CN 110967569 A CN110967569 A CN 110967569A CN 201811160608 A CN201811160608 A CN 201811160608A CN 110967569 A CN110967569 A CN 110967569A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/10—Radiation diagrams of antennas
- G01R29/105—Radiation diagrams of antennas using anechoic chambers; Chambers or open field sites used therefor
Abstract
The embodiment of the application provides a test system and a vehicle test method, wherein the test system is applied to testing the electromagnetic compatibility performance of a vehicle and/or the performance of an entire vehicle antenna, and the system comprises: the first darkroom is used for detecting the electromagnetic compatibility of the whole vehicle of the vehicle; the first darkroom is a semi-anechoic chamber; the second darkroom is used for detecting the performance of the whole vehicle antenna of the vehicle; the second darkroom is a full-electric-wave darkroom; the first darkroom and the second darkroom are connected through a movable wall, and when the electromagnetic compatibility performance and/or the whole vehicle antenna performance of the vehicle in the V2X communication state are detected, the movable wall is moved, so that the first darkroom is communicated with the second darkroom. It can be seen that with the test system provided by the embodiment of the application, when the vehicle is in the V2X communication state, the test system can be used to test the EMC performance and/or the overall antenna performance of the vehicle.
Description
Technical Field
The application relates to the technical field of automobiles, in particular to a test system and a vehicle test method.
Background
With the continuous development of the automobile industry, people have more and more requirements on automobiles, and with the continuous increase of the number of automobiles, the traffic safety problem becomes a worldwide big problem, and hundreds of thousands of casualties are caused by traffic accidents every year.
The main reason for traffic accidents is that the colliding vehicles do not communicate with each other in time to know the current traffic conditions. To solve this problem, V2X (Vehicle to X) technology is proposed, where X may be Infrastructure (Infrastructure), Vehicle (Vehicle), human (Pedestrian), etc. The V2X technology is mainly used to implement communication between vehicles, between vehicles and roadside facilities, between vehicles and the internet, so as to obtain a series of traffic information such as real-time road conditions and road information, so that the vehicle driver can take corresponding measures according to the obtained traffic information, thereby improving driving safety.
In an actual traffic environment, when a vehicle communicates with other devices through the V2X technology, interference of electromagnetic waves or other signals in the environment may be caused, and thus communication of the vehicle is affected, and in order to ensure normal operation of the vehicle V2X technology, the electromagnetic compatibility and the antenna performance of the entire vehicle need to be detected for the vehicle in the V2X communication state.
However, the prior art does not have a technical solution for the performance test of the V2X technology.
Disclosure of Invention
In view of this, the present application provides a testing system and a vehicle testing method, which may be used to test the entire vehicle electromagnetic compatibility performance and/or the entire vehicle antenna performance of a vehicle when the vehicle performs V2X communication, so as to ensure the stability of the entire vehicle electromagnetic performance and make the V2X communication smooth.
In order to solve the technical problem, the following technical scheme is adopted in the application:
the first aspect of the present application provides a test system, which is applied to test electromagnetic compatibility performance of a vehicle and/or performance of an entire vehicle antenna, and the system includes:
the first darkroom is used for detecting the electromagnetic compatibility of the whole vehicle of the vehicle; the first darkroom is a semi-anechoic chamber;
the second darkroom is used for detecting the performance of the whole vehicle antenna of the vehicle; the second darkroom is a full-electric-wave darkroom;
the first darkroom and the second darkroom are connected through a movable wall, and when the electromagnetic compatibility performance and/or the whole vehicle antenna performance of the vehicle in the V2X communication state are detected, the movable wall is moved, so that the first darkroom is communicated with the second darkroom.
Optionally, the first darkroom comprises:
a receiving antenna for receiving an interference signal generated by the vehicle;
a receiver for receiving and processing the interference signal;
a signal generator for generating a standard interference signal;
a transmitting antenna for transmitting the standard interference signal;
a hub for carrying the vehicle; the rotating hub can rotate; the vehicle is movable on the hub.
Optionally, the second darkroom comprises:
the rotary table is used for bearing the vehicle and rotating;
the single probe arch is used for installing a gain receiving probe and receiving a wireless radio frequency signal sent by the vehicle; the gain receiving probe is a single probe;
the multi-probe arch is used for installing a gain receiving probe and receiving a wireless radio frequency signal sent by the vehicle; the gain receiving probe is a multi-probe.
A second aspect of the present application provides a vehicle testing method including a first vehicle and a simulation apparatus, between which V2X communication is possible, the method including:
placing the first vehicle in a first dark room in a test system; placing the simulation equipment in a second darkroom in the test system;
controlling the first vehicle to communicate with the simulation device at V2X;
according to the test requirement, carrying out the whole vehicle electromagnetic compatibility test on the first vehicle;
wherein the test system is a test system according to any one of claims 1-3.
Optionally, placing the first vehicle in the second dark room; placing the simulation device in the first dark room;
controlling the first vehicle to communicate with the simulation device at V2X;
and carrying out the whole vehicle antenna performance test on the first vehicle according to the test requirement.
Optionally, when the simulation apparatus is a second vehicle, the method further includes:
according to the test requirement, carrying out the whole vehicle antenna performance test on the second vehicle;
optionally, when the simulation apparatus is a second vehicle, the method further includes:
and carrying out the whole vehicle electromagnetic compatibility test on the second vehicle according to the test requirement.
Optionally, the method further includes:
and judging whether the electromagnetic compatibility test result of the whole vehicle meets the electromagnetic compatibility standard requirement of the whole vehicle.
Optionally, the performance test of the whole vehicle antenna includes testing a three-dimensional gain directional diagram of the vehicle antenna.
Optionally, the method further includes:
and judging whether the three-dimensional gain directional diagram is matched with a preset gain directional diagram.
Compared with the prior art, the method has the following beneficial effects:
through the technical scheme, the test system provided by the embodiment of the application comprises the first darkroom and the second darkroom, wherein the first darkroom can be used for testing the electromagnetic compatibility of the whole vehicle of the vehicle, the second darkroom can be used for testing the antenna performance of the whole vehicle of the vehicle, and when the vehicle is in a V2X communication state, the test system can be used for testing the electromagnetic compatibility of the whole vehicle of the vehicle and/or the antenna performance of the whole vehicle.
Drawings
In order that the detailed description of the present application may be clearly understood, a brief description of the drawings, which will be used when describing the detailed description of the present application, follows. It is obvious that these drawings are only some embodiments of the present application and that other drawings may be obtained by a person skilled in the art without the inventive step.
Fig. 1 is a schematic structural diagram of a test system according to an embodiment of the present disclosure;
fig. 2 is a flowchart of a vehicle testing method according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical means and advantages of the present application more clear and complete, specific embodiments of the present application will be described below with reference to the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to facilitate understanding of the technical solutions provided in the present application, the following will briefly describe the background art of the present application.
With the wider application of the V2X technology, in order to ensure the communication between the vehicle and the base station, between the vehicle and the vehicle, and between the vehicle and other objects or people, the entire vehicle electromagnetic compatibility performance and/or the radiation capability of the antenna of the vehicle need to be tested in the vehicle V2X communication state to obtain the communication performance of the vehicle.
Among them, electromagnetic Compatibility (EMC) refers to the ability of a device or system to operate in its electromagnetic environment in compliance with requirements and not to generate intolerable electromagnetic interference to other devices in its environment. Therefore, EMC includes two requirements: on one hand, the electromagnetic interference generated to the environment by the equipment in the normal operation process cannot exceed a certain limit value; another aspect refers to a device that has a degree of immunity to electromagnetic interference present in the environment in which it is located, i.e., electromagnetic susceptibility.
The antenna performance refers to the radiation performance of the antenna in the practical application environment, such as radiation parameters of a directional diagram, gain, efficiency and the like.
Based on the above problems, the present application provides a test system and a vehicle test method, where the test system includes a first darkroom and a second darkroom, where the first darkroom may be used to test a complete vehicle electromagnetic compatibility performance of a vehicle, and the second darkroom may be used to test a complete vehicle antenna performance of the vehicle, and when the vehicle is in a V2X communication state, the test system may be used to test the complete vehicle electromagnetic compatibility performance and/or the complete vehicle antenna performance of the vehicle.
The following describes the components of the test system in the embodiments of the present application in detail by way of embodiments with reference to the accompanying drawings.
Example one
Referring to fig. 1, which is a structural diagram of a test system provided in an embodiment of the present application, where the test system is applied to test electromagnetic compatibility and/or performance of an entire vehicle antenna of a vehicle, and the system may include: a first darkroom 10 and a second darkroom 20.
The first darkroom 10 is used for detecting the electromagnetic compatibility of the whole vehicle.
And the second darkroom 20 is used for detecting the performance of the whole vehicle antenna of the vehicle.
The first darkroom and the second darkroom are connected through a movable wall, and when the electromagnetic compatibility performance and/or the whole vehicle antenna performance of the vehicle in the V2X communication state are detected, the movable wall is moved, so that the first darkroom is communicated with the second darkroom. In practical applications, the testing system may further include a movable wall preparation area to which the movable wall can be moved, so that the first darkroom and the second darkroom are communicated.
In practical applications, the first darkroom may be a semi-anechoic chamber, which is also called an EMC darkroom, and adopts a standard 10 m darkroom. The EMC darkroom is a six-sided box body which is designed by shielding, the interior of the box body is covered by electromagnetic wave absorbing materials, and a conductive floor is used and is not covered by the electromagnetic wave absorbing materials so as to simulate an ideal open field. In the EMC darkroom, because the ground is not covered with the wave-absorbing material, a reflection path can be generated, so that the receiving antenna can receive a direct path signal and a reflection path signal.
In this embodiment, the first darkroom 10 includes a receiving device and a transmitting device, wherein the receiving device includes a receiver 101 and a receiving antenna 102. The receiving antenna 102 is used for receiving an interference signal generated by the vehicle in the V2X state; a receiver 101 for receiving and processing the interference signal received by the receiving antenna so that the system detects the electromagnetic compatibility of the vehicle. The transmitting device comprises a signal generator 103 and a transmitting antenna 104, wherein the signal generator 103 is used for generating a standard interference signal; and the transmitting antenna 104 is used for transmitting a standard interference signal to interfere the wireless radio frequency signal transmitted by the vehicle in the V2X state, so that the system detects the electromagnetic compatibility of the vehicle.
In order to ensure that the standard interference signal generated by the signal generator has a certain interference power, the first darkroom may further include a power amplifier for performing power amplification on the standard interference signal, and the transmitting antenna transmits the amplified standard interference signal.
In order to implement the electromagnetic compatibility test for all directions of the vehicle, the first darkroom 10 may further include: the rotating hub 105 is used for bearing a vehicle and can realize dynamic loading of the vehicle, so that the vehicle can be detected in all directions, the electromagnetic compatibility of the whole vehicle can be guaranteed, and the reliable safety of the whole vehicle can be guaranteed.
In practical application, the second darkroom can be a full-anechoic chamber, a spherical near-field full-anechoic chamber is adopted, the darkroom is also called a whole-vehicle antenna darkroom, the reflection of the ground, the ceiling and the wall of the anechoic chamber is small, the interference of the external environment is small, free space can be simulated, and the anechoic chamber is suitable for testing emission, sensitivity and the like.
In this embodiment, the second darkroom 20 may include a turret 201, a single probe arch 202 and a multi-probe arch 203, the single probe arch 202 and the multi-probe arch 203 being mounted above the turret 201. The turntable 201 is used for bearing a vehicle and rotating to test the performance of the omnidirectional antenna of the vehicle. The single probe arch 202 is provided with a gain receiving probe to receive radio frequency signals sent by vehicles, the gain receiving probe is a single probe, the probe is replaced to meet the test requirements of different frequency bands, and the frequency coverage range of the single probe is 70MHz-6 GHz. In practical applications, a single probe needs to move to detect the performance of the vehicle-mounted antenna through different elevation angles. The multi-probe arch 203 is used for installing a gain receiving probe to receive a radio frequency signal sent by a vehicle, the gain receiving probe is a multi-probe, the frequency coverage range is 400MHz-3GHz, the frequency coverage range is a common frequency band of the vehicle-mounted antenna, the test efficiency can be greatly improved through multi-probe sampling, in practical application, the elevation angle of each probe in the multi-probe can be set, and the performance of the vehicle-mounted antenna can be detected through different elevation angles to obtain parameters such as an antenna gain directional diagram and efficiency.
In a specific implementation, the probe arches may all mount a single probe, or may all mount multiple probes, and this embodiment is not limited herein. Considering that if a single probe is used, the single test time is longer, and the test efficiency is low; if multiple probes are used, increased costs, complicated calibration, etc. may result. Thus, in this example, both single and multiple probe arches are used.
In practical application, the gain receiving probe and the vehicle-mounted antenna are matched for use, when a vehicle carries out V2X communication, a wireless radio frequency signal is transmitted through the vehicle-mounted antenna, and the gain receiving probe receives the wireless radio frequency signal transmitted by the vehicle-mounted antenna, so that the test system obtains the radiation performance of the vehicle-mounted antenna according to the received wireless radio frequency signal.
Through the test system that this application embodiment provided, use EMC darkroom and antenna darkroom are compound to realize the vehicle when V2X communication state, carry out whole car electromagnetic compatibility capability test and/or whole car antenna capability test to the vehicle, reduced test cost, the test that can high-efficiently accomplish corresponding index simultaneously, with the stability of guaranteeing whole car electromagnetic performance, and then can guarantee the security of vehicle.
Based on the test system provided by the above embodiment, the embodiment of the present application further provides a vehicle test method, and the test method will be described below with reference to the accompanying drawings.
Referring to fig. 2, the figure is a flowchart of a vehicle testing method provided in the embodiment of the present application.
In this embodiment, the simulation system includes a first vehicle and a simulation device, where V2X communication is possible between the first vehicle and a simulation setup, and the method may include:
s201: the first vehicle is placed in a first dark room in the test system, and the simulation equipment is placed in a second dark room in the test system.
In this embodiment, when the electromagnetic compatibility test of the entire vehicle needs to be performed on the first vehicle in the V2X communication state, the first vehicle needs to be in a first darkroom, and the simulation device needs to be in a second darkroom.
It will be appreciated that since X may represent a vehicle, infrastructure, person, etc., when X is an infrastructure (base station) or a person, it is necessary to simulate the characteristics of the base station or person with other devices to effect testing of the first vehicle when X is an infrastructure (base station) or a person.
S202: and controlling the first vehicle and the simulation equipment to carry out V2X communication.
The present embodiment mainly tests the electromagnetic compatibility of the first vehicle in the V2X communication state, and therefore, controls the first vehicle and the simulation device to perform V2X communication when the first vehicle and the simulation device are located in the first dark room and the second dark room, respectively.
S203: and carrying out the whole vehicle electromagnetic compatibility test on the first vehicle according to the test requirement.
In specific implementation, according to test requirements, the transmitting performance of the first vehicle and the anti-interference performance of the first vehicle are tested, so that the electromagnetic compatibility performance index of the first vehicle in the V2X communication state is obtained.
When the simulation device is a second vehicle and the second vehicle is located in a second darkroom, the whole vehicle antenna performance test can be performed on the second vehicle according to the test requirement, so that the radiation parameters of the vehicle-mounted antenna in the V2X communication state can be obtained.
It can be understood that, in a possible implementation manner, the performance of the entire antenna of the first vehicle may also be tested by using a second darkroom in the test system, which specifically includes: placing the first vehicle in a second darkroom, and placing the simulation equipment in the first darkroom; controlling the first vehicle and the simulation device to communicate V2X; and according to the test requirement, carrying out the whole vehicle antenna performance test on the first vehicle.
The whole vehicle antenna performance test can include testing a three-dimensional gain directional pattern of the vehicle-mounted antenna, that is, when the first vehicle is located in the second darkroom and performs V2X communication with the simulation device located in the first darkroom, the three-dimensional gain directional pattern of the vehicle-mounted antenna can be obtained through testing.
In practical application, when the three-dimensional gain directional diagram of the vehicle-mounted antenna is obtained, whether the three-dimensional gain directional diagram obtained through testing is matched with the preset gain directional diagram or not can be judged, so that the actual performance of the vehicle-mounted antenna is obtained. The preset gain directional diagram is a preset antenna ideal three-dimensional gain directional diagram, and if the three-dimensional gain directional diagram obtained through testing is matched with the preset gain directional diagram, the radiation performance of the vehicle-mounted antenna is good.
When the simulation equipment is a second vehicle, and when the second vehicle is located in the first darkroom, the electromagnetic compatibility test of the whole vehicle can be carried out on the second vehicle according to the test requirement, so that the electromagnetic compatibility performance index of the whole vehicle of the second vehicle in the V2X communication state can be obtained.
In this embodiment, after the test system is used to perform the complete vehicle EMC test on the first vehicle or the second vehicle, whether the electromagnetic compatibility of the vehicle meets the complete vehicle electromagnetic compatibility standard requirement may also be determined according to the test result. The common electromagnetic compatibility standards of the whole vehicle comprise GB14023, GB/T18387, GB18655 and GB/T19951.
According to the vehicle testing method provided by the embodiment, the tested vehicle, namely the first vehicle, is located in the first darkroom of the testing system, the simulation equipment is located in the second darkroom, and the first vehicle and the simulation equipment are controlled to carry out V2X communication, so that the first vehicle is subjected to EMC testing by using the first darkroom, and therefore the EMC testing of the communication vehicle is carried out in the V2X communication state, the electromagnetic compatibility of the whole vehicle is guaranteed, and the reliability of the communication of the whole vehicle is guaranteed.
In order to facilitate understanding of the vehicle testing method provided in the embodiments of the present application, a simulation apparatus is described as a second vehicle. The first vehicle is positioned on a rotating hub of a first darkroom, the second vehicle is positioned on a rotating platform of a second darkroom, the first vehicle and the second vehicle are in V2V communication, a receiving antenna in the first darkroom receives an interference signal generated by the first vehicle and sends the interference signal to a receiver, so that the receiver processes the received interference signal to analyze the interference capability of the first vehicle on the environment; meanwhile, a signal generator in the first darkroom generates a standard interference signal and transmits the standard interference signal through a transmitting antenna so as to interfere the transmitted wireless radio frequency signal of the first vehicle and analyze the anti-interference capability of the first vehicle on the environment, thereby obtaining the electromagnetic compatibility of the first vehicle.
And the single-probe arch and the multi-probe arch of the second darkroom receive the radio frequency signals generated by the second vehicle, and the vehicle-mounted antenna performance of the second vehicle is analyzed according to the received radio frequency signals.
The foregoing is illustrative of the preferred embodiments of the present application and is not to be construed as limiting in any way. Although the present application has been described with reference to the preferred embodiments, it is not intended to limit the present application. Those skilled in the art can now make numerous possible variations and modifications to the disclosed embodiments, or modify equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the claimed embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application still fall within the protection scope of the technical solution of the present application without departing from the content of the technical solution of the present application.
Claims (10)
1. A test system for testing electromagnetic compatibility and/or overall vehicle antenna performance of a vehicle, the system comprising:
the first darkroom is used for detecting the electromagnetic compatibility of the whole vehicle of the vehicle; the first darkroom is a semi-anechoic chamber;
the second darkroom is used for detecting the performance of the whole vehicle antenna of the vehicle; the second darkroom is a full-electric-wave darkroom;
the first darkroom and the second darkroom are connected through a movable wall, and when the electromagnetic compatibility performance and/or the whole vehicle antenna performance of the vehicle in the V2X communication state are detected, the movable wall is moved, so that the first darkroom is communicated with the second darkroom.
2. The system of claim 1, wherein the first dark room comprises:
a receiving antenna for receiving an interference signal generated by the vehicle;
a receiver for receiving and processing the interference signal;
a signal generator for generating a standard interference signal;
a transmitting antenna for transmitting the standard interference signal;
a hub for carrying the vehicle; the rotating hub can rotate; the vehicle is movable on the hub.
3. The system of claim 2, wherein the second dark room comprises:
the rotary table is used for bearing the vehicle and rotating;
the single probe arch is used for installing a gain receiving probe and receiving a wireless radio frequency signal sent by the vehicle; the gain receiving probe is a single probe;
the multi-probe arch is used for installing a gain receiving probe and receiving a wireless radio frequency signal sent by the vehicle; the gain receiving probe is a multi-probe;
wherein the single and multiple probe arches are located above the turret.
4. A vehicle testing method comprising a first vehicle and a simulation device, wherein V2X communication is enabled between the first vehicle and the simulation device, the method comprising:
placing the first vehicle in a first dark room in a test system; placing the simulation equipment in a second darkroom in the test system;
controlling the first vehicle to communicate with the simulation device at V2X;
according to the test requirement, carrying out the whole vehicle electromagnetic compatibility test on the first vehicle;
wherein the test system is a test system according to any one of claims 1-3.
5. The method of claim 4, further comprising:
placing the first vehicle in the second dark room; placing the simulation device in the first dark room;
controlling the first vehicle to communicate with the simulation device at V2X;
and carrying out the whole vehicle antenna performance test on the first vehicle according to the test requirement.
6. The method of claim 4, wherein when the simulation device is a second vehicle, the method further comprises:
and carrying out the whole vehicle antenna performance test on the second vehicle according to the test requirement.
7. The method of claim 5, wherein when the simulation device is a second vehicle, the method further comprises:
and carrying out the whole vehicle electromagnetic compatibility test on the second vehicle according to the test requirement.
8. The method according to any one of claims 4-7, further comprising:
and judging whether the electromagnetic compatibility test result of the whole vehicle meets the electromagnetic compatibility standard requirement of the whole vehicle.
9. The method of any of claims 4-7, wherein the vehicle antenna performance test comprises testing a three-dimensional gain pattern of a vehicle antenna.
10. The method of claim 9, further comprising:
and judging whether the three-dimensional gain directional diagram is matched with a preset gain directional diagram.
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| CN111586634A (en) * | 2020-05-23 | 2020-08-25 | 重庆大学 | V2X external field test scene mapping method, test method and test system |
| CN112881830A (en) * | 2021-01-15 | 2021-06-01 | 中汽研汽车检验中心（天津）有限公司 | Electromagnetic compatibility test method of vehicle-mounted terminal |
| CN113447738A (en) * | 2021-06-15 | 2021-09-28 | 安徽精科检测技术有限公司 | Movable rotary hub system for automobile electromagnetic compatibility test |
| CN114264959A (en) * | 2021-12-08 | 2022-04-01 | 中国汽车工程研究院股份有限公司 | EMC performance test system under fuel cell system loading condition |
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| CN111586634B (en) * | 2020-05-23 | 2021-05-14 | 重庆大学 | V2X external field test scene mapping method, test method and test system |
| CN112881830A (en) * | 2021-01-15 | 2021-06-01 | 中汽研汽车检验中心（天津）有限公司 | Electromagnetic compatibility test method of vehicle-mounted terminal |
| CN113447738A (en) * | 2021-06-15 | 2021-09-28 | 安徽精科检测技术有限公司 | Movable rotary hub system for automobile electromagnetic compatibility test |
| CN114264959A (en) * | 2021-12-08 | 2022-04-01 | 中国汽车工程研究院股份有限公司 | EMC performance test system under fuel cell system loading condition |
| CN114264959B (en) * | 2021-12-08 | 2023-09-26 | 中国汽车工程研究院股份有限公司 | EMC performance test system under loading working condition of fuel cell system |
| WO2023240928A1 (en) * | 2022-06-17 | 2023-12-21 | 深圳市通用测试系统有限公司 | Test system for vehicle-mounted antenna |
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