EMC test method and system for intelligent networked automobile communication system

Abstract

The invention provides an intelligent networked automobile communication system EMC test method and system, and the method comprises the steps: carrying out the field test of a communication system of a vehicle, and recording the first position change information between a moving vehicle and a static base station; performing path mapping according to the first position change information to obtain second position change information between the static vehicle and the mobile base station; and keeping the test vehicle static in the test site according to the second position change information, moving the test base station, and testing the communication system of the test vehicle. The problem that in the prior art, a common network connection system testing scheme and original monitoring equipment of a semi-anechoic chamber cannot meet the electromagnetic radiation immunity testing requirement of an intelligent network connection automobile network connection system is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle electromagnetic radiation testing, and in particular to an EMC testing method and system for an intelligent networked vehicle communication system. Background Art

[0002] With the development of communication technology, the development of LTE, WANL, 5G and other technologies has greatly improved the quality and transmission speed of network data, and the Internet of Vehicles technology has also developed rapidly. The Internet system is an important part of intelligent connected vehicles. It uses communication technology to connect vehicles, roads, people and networks in real time to maximize the efficiency of the transportation system and improve the safety, comfort and intelligence level of the vehicle. Through the organic combination of Internet technology and autonomous driving technology, true autonomous driving can be achieved. However, in the actual working environment of intelligent connected vehicles, there are a large number of complex electromagnetic environments that may affect the normal operation of the system. The electromagnetic environment inside and outside the vehicle and the electromagnetic radiation anti-interference performance in complex environments are important performance indicators for evaluating the stable and reliable operation of intelligent connected vehicles and connected systems.

[0003] The research and development, testing and verification of intelligent connected vehicles are often based on field tests or performance tests in simulated scenarios. The electromagnetic immunity test of the system is usually based on the testing of single components. In a semi-anechoic chamber, the difficulty in implementing the evaluation is to simulate various communication scenarios of the network, various communication signals, and analysis and evaluation data acquisition and indicator design.

[0004] However, due to the limited space in the semi-anechoic chamber, it is difficult to build base station signal towers, GPS positioning signals, etc. like a test field; and during electromagnetic compatibility testing, it is necessary to avoid the impact of metal devices in the test room on the electromagnetic environment, and additional electromagnetic transmitting devices cannot be brought into the test environment. During the electromagnetic radiation immunity test, it is necessary to ensure that the additional devices can operate normally in a strong electromagnetic environment.

[0005] Therefore, general network system testing solutions and existing monitoring equipment in semi-anechoic chambers cannot meet the electromagnetic radiation immunity testing requirements for intelligent networked vehicle network systems. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides an EMC testing method and system for an intelligent connected vehicle communication system, which solves the problem that the general connected system testing scheme and the original monitoring equipment in the semi-anechoic chamber in the prior art cannot meet the electromagnetic radiation immunity testing requirements of the intelligent connected vehicle communication system.

[0007] According to an embodiment of the present invention, a method for EMC testing of a communication system of an intelligent connected vehicle includes:

[0008] During a field test of a communication system of a vehicle, first position change information between a moving vehicle and a stationary base station is recorded;

[0009] Performing path mapping according to the first position change information to obtain second position change information between the stationary vehicle and the mobile base station;

[0010] The test vehicle is kept stationary in the test field according to the second position change information, and the test base station is moved to test the communication system of the test vehicle.

[0011] Preferably, the first position change information includes the moving path of the moving vehicle, the height of the moving vehicle, the spatial position of the stationary base station, and the change in signal strength between the moving vehicle and the base station;

[0012] The second position change information includes the moving path of the mobile base station and the change in the strength of the stationary vehicle and the mobile signal.

[0013] Preferably, the path mapping process includes:

[0014] Establishing a horizontal coordinate system and a vertical coordinate system based on the spatial positions of two stationary base stations;

[0015] Mapping the moving path of the moving vehicle to a horizontal coordinate system to obtain a moving curve of the moving vehicle;

[0016] According to the moving curve and the spatial positions of the two stationary base stations, the angle change relationship between any point on the moving curve and the two stationary base stations is fitted respectively to obtain the horizontal angle change function between the stationary vehicle and the moving base station;

[0017] According to the height of the moving vehicle and the spatial positions of the two base stations, the vertical angle variation relationship between the moving vehicle and the two stationary base stations is fitted respectively, and the vertical angle variation function between the stationary vehicle and the moving base station is obtained;

[0018] The moving path of the mobile base station is fitted according to the horizontal angle change function and the vertical angle change function, and the signal strength change between the mobile vehicle and the base station is taken as the signal strength change between the stationary vehicle and the mobile vehicle.

[0019] Preferably, the horizontal coordinate system includes an X-axis and a Y-axis, and the positions of the two base stations are respectively on the X-axis and the Y-axis;

[0020] The vertical coordinate system includes an X-axis and a Z-axis, and the positions of the two base stations are both on the Z-axis.

[0021] Preferably, the horizontal angle variation function is as follows:

[0022]

[0023] Among them, M and N are the horizontal angle change functions of the two stationary base stations respectively, (x0, y0) is the coordinate of any point on the moving curve, (x1, y1) is the horizontal coordinate of the stationary base station M, and (x2, y2) is the horizontal coordinate of the stationary base station N.

[0024] Preferably, the vertical angle variation function is as follows:

[0025]

[0026] Among them, h m is the height of the stationary base station from the ground, and du is the height of the moving vehicle.

[0027] On the other hand, according to an embodiment of the present invention, there is also provided an EMC test system for an intelligent networked vehicle communication system, the system using the above-mentioned EMC test method for an intelligent networked vehicle communication system, including:

[0028] A semi-anechoic chamber, wherein a placement table and a circular guide rail are coaxially arranged in the center of the semi-anechoic chamber;

[0029] Two moving devices, which are arranged on the annular guide rail and can move along the moving guide rail;

[0030] A test base station, each of the mobile devices is provided with a test base station, and the mobile device can drive the test base station to move up and down;

[0031] An electromagnetic transmitting device, which is arranged on the top of the anechoic chamber and is used to transmit electromagnetic waves to the test vehicle;

[0032] The control device is electrically connected to the test base station and the mobile device, and is used to control the operation of the mobile device and the test base station.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] In the field test, the driving path of the moving vehicle and the angle changes and signal strength changes between the moving vehicle and the stationary base station are mapped to the semi-anechoic chamber environment and converted into the moving path of the mobile base station and the angle changes and signal strength changes between the stationary vehicle and the mobile base station. In this way, a constantly changing and real signal test scene can be provided for the test vehicle in the semi-anechoic chamber, so as to simulate the real electromagnetic test environment and meet the electromagnetic radiation immunity test requirements of the intelligent connected vehicle network system. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The figure is a flow chart of a testing method according to an embodiment of the present invention.

[0036] Figure 2It is a horizontal mapping relationship diagram of an embodiment of the present invention.

[0037] Figure 3 It is a vertical mapping relationship diagram of an embodiment of the present invention.

[0038] Figure 4 This is a diagram of the control device interface of an embodiment of the present invention. DETAILED DESCRIPTION

[0039] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0040] like Figure 1 As shown, an embodiment of the present invention proposes an EMC test method for an intelligent connected vehicle communication system, comprising:

[0041] During a field test of a communication system of a vehicle, first position change information between a moving vehicle and a stationary base station is recorded;

[0042] After the vehicle is field tested, the first position change information is recorded, including the moving path of the moving vehicle, the height of the moving vehicle, the spatial position of the stationary base station, and the change in signal strength between the moving vehicle and the base station.

[0043] In addition, the site of the field test is modeled, and the moving path of the moving vehicle is displayed in the site model to facilitate the fitting of the moving path in the later stage.

[0044] Performing path mapping according to the first position change information to obtain second position change information between the stationary vehicle and the mobile base station;

[0045] Assume that there are two stationary base stations M and N. A horizontal coordinate system is established based on M and N. Figure 2 As shown, M and N are on the Y-axis and X-axis of the horizontal coordinate system respectively. In the macroscopic situation of the large map, the normal driving direction of the vehicle must be consistent with the tangent direction of the road. Figure 1 The vehicle is marked as a blue dot, and the horizontal angles of the two corresponding base stations are and The angle and and Taking base station M as an example, the vertical angle of the real driving scene is θ m,u The change in vertical angle is the change in the vertical angle of the laboratory simulation scene. m,u The same applies to changes.

[0046] Horizontal mapping relationship:

[0047] The vehicle movement path in the field test should be set in the horizontal coordinate system ( Figure 2The curve Y=y(x) in the figure is: Assume that point A is (x0,y0), point M is (x1,y1), and point N is (x2,y2), then:

[0048]

[0049] According to the angle formula:

[0050]

[0051] Ask first and The angle of With the standard vector Angle:

[0052]

[0053] Same reason

[0054]

[0055] In summary, we can get the horizontal angle change function between the stationary vehicle and the mobile base station (test base station):

[0056]

[0057] Among them, M and N are the horizontal angle change functions of the two stationary base stations, and M is and The angle between and The rotation angle is calculated by subtracting the angle at the previous moment from the angle at the next moment.

[0058] As the number of base stations increases, the above principle can be used for calculation, except that corresponding laboratory simulation antennas and control devices need to be added.

[0059] The vertical mapping relationship is as follows Figure 3 As shown:

[0060] Taking base station M as an example, a vertical coordinate system is established based on base station M.

[0061] Assume that the main lobe angle between the vehicle-mounted antenna and the base station antenna at the starting position is θ m,u Translated into a semi-anechoic chamber, we have:

[0062] θ=θ m,u

[0063] The horizontal distance d between the stationary base station and the communication antenna of the moving vehicle during the actual vehicle driving process m,u is variable, the vertical distance h mis constant; the horizontal distance d between the mobile base station (test base station) and the stationary vehicle communication antenna in the semi-anechoic chamber s is constant, the vertical distance h r It changes.

[0064] That is, θ during normal driving of the vehicle m,u The change is caused by m,u caused by h r The transformation achieves recurrence, so θ

[0065]

[0066] Correspondingly, the vertical angle variation function between the stationary vehicle and the mobile base station in the semi-anechoic chamber of the base station M is:

[0067]

[0068] The base station should r The height should be

[0069] Receiving angle of vehicle antenna:

[0070] θ c =θ-θ 1 / 2tz

[0071] where θ 1 / 2tz is the initial rotation angle of the vehicle antenna

[0072] Similarly, the laboratory of base station N

[0073] Then, the moving path of the mobile base station (test base station) is fitted according to the horizontal angle change function and the vertical angle change function, and the change in the signal strength between the mobile vehicle and the base station is used as the change in the signal strength between the stationary vehicle and the mobile vehicle.

[0074] The test vehicle is kept stationary in the test field according to the second position change information, and the test base station is moved to test the communication system of the test vehicle.

[0075] In order to restore the real driving scene as much as possible, it is necessary to collect data on the real road, and then build a radio wave propagation scene model in the software. Finally, to simulate the driving scene, it is necessary to use software to control the mechanical device so that it drives the test base station to run according to the calculated moving path and realize the angle change of the test base station and vehicle antenna. The software also needs to control the antenna's transmission power to simulate the changes in the strength of the base station signal received by the vehicle antenna in the actual driving scenario, in order to simulate the real driving scene in the dark room.

[0076] According to the driving scenario simulation or the actual collected signal strength data, the signal is simulated by the comprehensive tester and the GNSS simulator, and the signal is amplified to the appropriate signal strength by the power amplifier. In this way, a constantly changing and real signal test scene can be provided for the test vehicle in the semi-anechoic chamber, so as to simulate the real electromagnetic test environment and meet the electromagnetic radiation immunity test requirements of the intelligent connected vehicle network system.

[0077] On the other hand, an embodiment of the present invention further provides an EMC test system for an intelligent networked vehicle communication system, wherein the system uses the above-mentioned EMC test method for an intelligent networked vehicle communication system, including:

[0078] A semi-anechoic chamber, wherein a placement table and a circular guide rail are coaxially arranged in the center of the semi-anechoic chamber;

[0079] Two moving devices, which are arranged on the annular guide rail and can move along the moving guide rail;

[0080] A test base station, each of the mobile devices is provided with a test base station, and the mobile device can drive the test base station to move up and down;

[0081] An electromagnetic transmitting device, which is arranged on the top of the anechoic chamber and is used to transmit electromagnetic waves to the test vehicle;

[0082] A control device is electrically connected to the test base station and the mobile device, and is used to control the operation of the mobile device and the test base station, such as Figure 4 shown.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An EMC test method for an intelligent connected vehicle communication system, characterized in that: include: During a field test of a communication system of a vehicle, first position change information between a moving vehicle and a stationary base station is recorded; Performing path mapping according to the first position change information to obtain second position change information between the stationary vehicle and the mobile base station; The test vehicle is kept stationary in the test field according to the second position change information, and the test base station is moved to test the communication system of the test vehicle.

2. The EMC testing method for an intelligent connected vehicle communication system according to claim 1, characterized in that: The first position change information includes the moving path of the mobile vehicle, the height of the mobile vehicle, the spatial position of the stationary base station, and the change in signal strength between the mobile vehicle and the base station; The second position change information includes the moving path of the mobile base station and the change in the strength of the stationary vehicle and the mobile signal.

3. The EMC testing method for an intelligent connected vehicle communication system according to claim 2, characterized in that: The path mapping process includes: Establishing a horizontal coordinate system and a vertical coordinate system based on the spatial positions of two stationary base stations; Mapping the moving path of the moving vehicle to a horizontal coordinate system to obtain a moving curve of the moving vehicle; According to the moving curve and the spatial positions of the two stationary base stations, the angle change relationship between any point on the moving curve and the two stationary base stations is fitted respectively to obtain the horizontal angle change function between the stationary vehicle and the moving base station; According to the height of the moving vehicle and the spatial positions of the two base stations, the vertical angle variation relationship between the moving vehicle and the two stationary base stations is fitted respectively, and the vertical angle variation function between the stationary vehicle and the moving base station is obtained; The moving path of the mobile base station is fitted according to the horizontal angle change function and the vertical angle change function, and the signal strength change between the mobile vehicle and the base station is taken as the signal strength change between the stationary vehicle and the mobile vehicle.

4. The EMC testing method for an intelligent connected vehicle communication system according to claim 3, characterized in that: The horizontal coordinate system includes an X-axis and a Y-axis, and the positions of the two base stations are respectively on the X-axis and the Y-axis; The vertical coordinate system includes an X-axis and a Z-axis, and the positions of the two base stations are both on the Z-axis.

5. The EMC testing method for an intelligent connected vehicle communication system according to claim 3, characterized in that: The horizontal angle variation function is as follows: Among them, M and N are the horizontal angle change functions of the two stationary base stations respectively, (x0, y0) is the coordinate of any point on the moving curve, (x1, y1) is the horizontal coordinate of the stationary base station M, and (x2, y2) is the horizontal coordinate of the stationary base station N.

6. The EMC testing method for an intelligent connected vehicle communication system according to claim 3, characterized in that: The vertical angle variation function is as follows: Among them, h m is the height of the stationary base station from the ground, d m,u is the horizontal distance between the stationary base station and the communication antenna of the moving vehicle.

7. The EMC test system for intelligent networked vehicle communication system according to claim 1, characterized in that: The system uses an EMC testing method for an intelligent connected vehicle communication system according to any one of claims 1 to 6, comprising: A semi-anechoic chamber, wherein a placement table and a circular guide rail are coaxially arranged in the center of the semi-anechoic chamber; Two moving devices, which are arranged on the annular guide rail and can move along the moving guide rail; A test base station, each of the mobile devices is provided with a test base station, and the mobile device can drive the test base station to move up and down; An electromagnetic transmitting device, which is arranged on the top of the anechoic chamber and is used to transmit electromagnetic waves to the test vehicle; The control device is electrically connected to the test base station and the mobile device, and is used to control the operation of the mobile device and the test base station.

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