CN115173968B - Intelligent network-connected automobile wireless communication performance test system - Google Patents
Intelligent network-connected automobile wireless communication performance test system Download PDFInfo
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- CN115173968B CN115173968B CN202210865582.4A CN202210865582A CN115173968B CN 115173968 B CN115173968 B CN 115173968B CN 202210865582 A CN202210865582 A CN 202210865582A CN 115173968 B CN115173968 B CN 115173968B
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- 238000004891 communication Methods 0.000 title claims abstract description 54
- 238000011056 performance test Methods 0.000 title claims abstract description 27
- 238000012360 testing method Methods 0.000 claims abstract description 47
- 239000000463 material Substances 0.000 claims abstract description 19
- 238000004088 simulation Methods 0.000 claims abstract description 13
- 238000005070 sampling Methods 0.000 claims abstract description 6
- 239000011358 absorbing material Substances 0.000 claims abstract description 5
- 239000004568 cement Substances 0.000 claims description 4
- 239000010426 asphalt Substances 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
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- 239000002184 metal Substances 0.000 claims description 2
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- 230000005540 biological transmission Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/15—Performance testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/29—Performance testing
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Abstract
The invention discloses an intelligent network connection automobile wireless communication performance test system, which comprises: a wave absorbing material is laid in the microwave darkroom and used for eliminating the reflection of wireless signals; the mechanical rocker arm is used for driving the measuring antenna to move along a preset track, and performing spherical surface test on the equivalent scaling model of the vehicle to be tested according to a preset sampling radius; the electromagnetic environment simulation material is paved on the darkroom ground and is used for constructing an electromagnetic characteristic equivalent scaling model of the real use environment of the vehicle and bearing the vehicle equivalent scaling model to be tested; the vehicle turntable carries and drives the equivalent scaling model of the vehicle to be tested and the electromagnetic environment simulation material to rotate on the horizontal plane; based on the scene, under the equivalent test frequency, the equivalent scaling model of the vehicle to be tested is subjected to wireless communication performance test, so that the wireless communication performance index of the real vehicle to be tested is obtained. The invention considers the electromagnetic characteristics of various real use environments of the vehicle to be tested, greatly reduces the construction cost of the darkroom and the complexity of the arrangement of the test scene, and improves the test efficiency.
Description
Technical Field
The invention relates to the technical field of wireless communication performance test, in particular to an intelligent network-connected automobile wireless communication performance test system.
Background
This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
With the advent of autopilot and intelligent networked automobiles and the increasing popularity of in-vehicle infotainment devices, more and more vehicles began to use wireless technology to implement vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-pedestrian (V2P), and vehicle-to-network (V2N) connections in large numbers. With this trend, modern automobiles increasingly resemble a wireless technology center that integrates a series of on-board wireless communication technologies and various transmission systems, and the need for reliable communication links is becoming urgent. Therefore, how to ensure absolute reliability of the wireless connection of the vehicle before it is put on the market is a critical issue.
After loading, the performance of the wireless communication antenna and the wireless communication module is affected by the actual use environment of the installed car body and the whole car. The performance test results of the single-level antenna and the module before loading can not truly reflect the difference of the wireless communication performance of the whole vehicle after loading. Therefore, the wireless communication performance of the vehicle is tested in the actual working environment of the whole vehicle, so that the wireless communication performance meets various performance index requirements in the actual use environment, and the wireless communication performance testing method is an indispensable link in future wireless communication performance testing of the whole vehicle.
For the test of the wireless communication performance of the whole vehicle, the existing scheme is that the vehicle to be tested is parked in the center of a turntable in a full-wave dark room, and the radiation parameters of the vehicle to be tested are subjected to spherical sampling (amplitude and phase) by using a measuring antenna. The far-field pattern of the vehicle-mounted antenna to be tested is obtained in a near-far-field conversion mode, and the vehicle-mounted wireless communication OTA performance index is obtained in a far-field direct measurement mode. As a free space test scheme, the scheme has higher test precision and test consistency for the whole vehicle-level wireless communication performance test, and has satisfactory test efficiency. The main disadvantage of this solution is that the effect of the actual use environment, including road surfaces, surrounding buildings, other vehicles, etc., on the wireless communication performance of the vehicle under test is not considered. The automobile is used as a participant of road traffic, and a use scene of free space does not exist, so that the test result of the automobile cannot represent the real whole automobile wireless communication performance of the automobile to be tested.
Another existing solution is to lay a bottom material on the darkroom ground, which simulates various real-use ground electromagnetic characteristics, so as to simulate the real-use situation of the vehicle on the road surface. The scheme considers the influence of the road surface condition on the wireless communication performance of the whole vehicle to a certain extent. The limitation of this solution is that the laying area of the road surface simulation material is not large, only around the vehicle body, taking into account the size, weight and bearing capacity of the vehicle to be tested and the road surface simulation material. However, in a real road driving environment, the coupling and reflection of wireless signals is never derived from only a small portion of the ground surrounding the vehicle. But from road surfaces in the range of tens of meters or even tens of meters around, surrounding buildings, and other traffic participants in vehicles, street lamps, etc. Therefore, the wireless communication performance of the vehicle under test must be measured in the reconstructed simulated real use environment. For the whole vehicle-level wireless communication performance test of the vehicle to be tested, the test cannot be done in a darkroom anyway.
Disclosure of Invention
The embodiment of the invention provides an intelligent network-connected automobile wireless communication performance test system, which comprises: the device comprises a microwave darkroom, a mechanical rocker arm, an electromagnetic environment simulation material and a vehicle turntable, wherein the mechanical rocker arm is positioned in the microwave darkroom and is provided with a measuring antenna;
the four side walls and the upper surface of the top of the microwave darkroom are paved with wave absorbing materials for eliminating the reflection of wireless signals;
the mechanical rocker arm with the measuring antenna is used for: driving the measuring antenna to move along a preset track, and performing spherical surface test on an equivalent scaling model of the vehicle to be tested according to a preset sampling radius;
the electromagnetic environment simulation material is paved on the darkroom ground and is used for simulating the actual use scene of the vehicle, constructing an electromagnetic characteristic equivalent scaling model of the actual use environment of the vehicle and carrying the equivalent scaling model of the vehicle to be tested;
the vehicle turntable is used for bearing and driving the equivalent scaling model of the vehicle to be tested and the electromagnetic environment simulation material to rotate on a horizontal plane;
based on the scene, under the equivalent test frequency, the equivalent scaling model of the vehicle to be tested is subjected to wireless communication performance test, so that the wireless communication performance index of the real vehicle to be tested is obtained.
The invention considers the electromagnetic characteristics of various real use environments of the vehicle to be tested, greatly reduces the construction cost of the darkroom and the complexity of the arrangement of the test scene, and improves the test efficiency.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:
FIG. 1 is a schematic diagram of a system for testing wireless communication performance of an intelligent network-connected vehicle according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an electromagnetic characteristic equivalent scaling model of a real vehicle use environment of an intelligent network-connected vehicle wireless communication performance test system in an embodiment of the invention;
fig. 3 is a schematic diagram of an electromagnetic characteristic equivalent scaling model of a real vehicle use environment of the intelligent network-connected vehicle wireless communication performance test system according to an embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings. The exemplary embodiments of the present invention and their descriptions herein are for the purpose of explaining the present invention, but are not to be construed as limiting the invention.
In the description of the present specification, the terms "comprising," "including," "having," "containing," and the like are open-ended terms, meaning including, but not limited to. Reference to the terms "one embodiment," "a particular embodiment," "some embodiments," "for example," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. The sequence of steps involved in the embodiments is used to schematically illustrate the practice of the present application, and is not limited thereto and may be appropriately adjusted as desired.
Fig. 1 is a schematic structural diagram of an intelligent network-connected automobile wireless communication performance test system in an embodiment of the present invention, where, as shown in fig. 1, the intelligent network-connected automobile wireless communication performance test system includes: the device comprises a microwave darkroom, a mechanical rocker arm, an electromagnetic environment simulation material and a vehicle turntable, wherein the mechanical rocker arm is positioned in the microwave darkroom and is provided with a measuring antenna;
the four side walls and the upper surface of the top of the microwave darkroom are paved with wave absorbing materials for eliminating the reflection of wireless signals;
the mechanical rocker arm with the measuring antenna is used for: driving the measuring antenna to move along a preset track, and performing spherical surface test on an equivalent scaling model of the vehicle to be tested according to a preset sampling radius;
the electromagnetic environment simulation material is paved on the darkroom ground and is used for simulating the actual use scene of the vehicle, constructing an electromagnetic characteristic equivalent scaling model of the actual use environment of the vehicle and carrying the equivalent scaling model of the vehicle to be tested;
the vehicle turntable is used for bearing and driving the equivalent scaling model of the vehicle to be tested and the electromagnetic environment simulation material to rotate on a horizontal plane;
based on the scene, under the equivalent test frequency, the equivalent scaling model of the vehicle to be tested is subjected to wireless communication performance test, so that the wireless communication performance index of the real vehicle to be tested is obtained.
Specifically, the microwave darkroom is provided with wave absorbing materials on four side walls and the upper surface of the top.
The equivalent scaling model of the vehicle to be measured is obtained by scaling down the dimensions of the vehicle to be measured and the vehicle-mounted antenna.
The invention considers the electromagnetic characteristics of various real use environments of the vehicle to be tested, greatly reduces the construction cost of the darkroom and the complexity of the arrangement of the test scene, and improves the test efficiency.
In the embodiment of the invention, the equivalent test frequency and the equivalent scaling model size are selected based on the following relation:
wherein f M For equivalent test frequency S M The dimension of the equivalent scaling model of the vehicle to be measured; f (f) F S is the actual working frequency of the vehicle-mounted wireless communication antenna of the vehicle to be tested F Is the true size of the vehicle to be tested. For example, for a vehicle to be tested with the length of 5m, the vehicle-mounted wireless communication module works in the 1GHz frequency band, and when the equivalent test frequency is set to be 25GHz, the equivalent scaling model size of the whole vehicle is reduced to 0.2m. And measuring an equivalent scaling model of the vehicle to be measured with the length of 0.2m under the 25GHz equivalent test frequency, and calculating to obtain the wireless communication performance index (1 GHz) of the real vehicle to be measured (with the length of 5 m). Greatly reduces the requirements for the space and construction cost of the test darkroom.
Specifically, the equivalent test frequency is selected to be not lower than 25GHz.
Specifically, f M /f F The ratio of (2) is not lower than 8.
In the embodiment of the invention, the electromagnetic characteristic equivalent scaling model of the real use environment of the vehicle has the scaling factor selected consistent with the test frequency scaling factor, namely:
wherein f M For equivalent test frequency f F The real working frequency of the vehicle-mounted wireless communication antenna of the vehicle to be tested is set; d (D) F For the real usage environment size of the vehicle to be tested,D M and (5) equivalent scaling model size for electromagnetic characteristics of the real use environment of the vehicle to be tested. For example, for a real use environment of a vehicle to be tested of 100m×100m, the vehicle-mounted wireless communication module works in a 1GHz band, and when the equivalent test frequency is set to 25GHz, the electromagnetic characteristic equivalent scaling model size of the real use environment of the vehicle to be tested is 4m×4m. Greatly reduces the requirements on the field size and the construction cost of the test darkroom.
Specifically, as shown in fig. 2 and 3, the electromagnetic characteristic equivalent scaling model of the real use environment of the vehicle includes a road surface equivalent scaling model, a surrounding building equivalent scaling model and an equivalent scaling model of road participants such as other vehicles and traffic lights.
Specifically, the area of the real use environment of the vehicle to be detected corresponding to the electromagnetic characteristic equivalent scaling model is not less than 50m multiplied by 50m.
Specifically, the pavement equivalent scaling model is made of any one of asphalt, sandy soil, cement and mixed pavement materials;
the surrounding building equivalent scaling model is made of any one of cement, concrete and brick-concrete structure materials.
The equivalent scaling model of road participants such as other vehicles, traffic lights and the like is made of metal.
The electromagnetic characteristic equivalent scaling model also comprises a tree equivalent scaling model and a lawn equivalent scaling model, and the material of the electromagnetic characteristic equivalent scaling model is the same as that of a real use environment.
In the embodiment of the invention, the equivalent scaling model of the surrounding building takes the effective part of shielding and reflection of the building to wireless signals in a real use environment into consideration, and the height of the equivalent model is not more than 1m. That is, the height of the equivalent scaling model of the surrounding building is reduced according to the real height equal proportion, and when the calculated equivalent model height is greater than 1m, the value is 1m.
In the embodiment of the invention, the rotation range of the mechanical rocker arm is 0-90 degrees of the pitching surface, namely, the sampling range of the pitching surface of the measuring antenna is (0, 90 degrees).
In the embodiment of the invention, the coordinate system of the test system is constructed as follows:
and taking the center point of the vehicle turntable as the coordinate origin of the test system, taking a plane parallel to the ground as an XY plane, and taking an axis perpendicular to the XY plane and facing to the upper part of the ground as a Z-axis forward direction.
Or, an arbitrary point on a straight line perpendicular to the surface of the vehicle turntable at the center of the vehicle turntable is taken as the origin of coordinates of the test system, a plane parallel to the ground is taken as an XY plane, and an axis perpendicular to the XY plane and facing to the upper part of the ground is taken as a Z-axis forward direction.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
1. An intelligent network-connected automobile wireless communication performance test system, which is characterized by comprising: the device comprises a microwave darkroom, a mechanical rocker arm, an electromagnetic environment simulation material and a vehicle turntable, wherein the mechanical rocker arm is positioned in the microwave darkroom and is provided with a measuring antenna;
the four side walls and the upper surface of the top of the microwave darkroom are paved with wave absorbing materials for eliminating the reflection of wireless signals;
the mechanical rocker arm with the measuring antenna is used for: driving the measuring antenna to move along a preset track, and performing spherical surface test on an equivalent scaling model of the vehicle to be tested according to a preset sampling radius;
the electromagnetic environment simulation material is paved on the darkroom ground and is used for simulating the actual use scene of the vehicle, constructing an electromagnetic characteristic equivalent scaling model of the actual use environment of the vehicle and carrying the equivalent scaling model of the vehicle to be tested;
in a real road running environment, coupling and reflection of wireless signals are derived from road surfaces around vehicles, surrounding buildings and other traffic participants such as vehicles and street lamps; the wireless communication performance of the vehicle to be measured is measured in the reconstructed simulated real use environment;
the electromagnetic characteristic equivalent scaling model of the real use environment of the vehicle comprises a pavement equivalent scaling model, a surrounding building equivalent scaling model and an equivalent scaling model of road participants including other vehicles and traffic lights;
the equivalent scaling model of the surrounding building takes the effective part of shielding and reflection of the building to wireless signals in a real use environment into consideration, and the height of the equivalent model is not more than 1m; the height of the equivalent scaling model of the surrounding building is reduced according to the real height in equal proportion, and when the calculated height of the equivalent model is greater than 1m, the value is 1m;
the real use environment area of the vehicle to be detected corresponding to the electromagnetic characteristic equivalent scaling model is not less than 50m multiplied by 50m;
the vehicle turntable is used for bearing and driving the equivalent scaling model of the vehicle to be tested and the electromagnetic environment simulation material to rotate on a horizontal plane;
based on the scene, under the equivalent test frequency, the equivalent scaling model of the vehicle to be tested is subjected to wireless communication performance test, so that the wireless communication performance index of the real vehicle to be tested is obtained.
2. The intelligent network-connected automobile wireless communication performance test system according to claim 1, wherein the equivalent test frequency is determined according to the following formula:
wherein f M For equivalent test frequency S M The dimension of the equivalent scaling model of the vehicle to be measured; f (f) F S is the actual working frequency of the vehicle-mounted wireless communication antenna of the vehicle to be tested F Is the true size of the vehicle to be tested.
3. The intelligent network-connected automobile wireless communication performance test system according to claim 1, wherein the pavement equivalent scaling model is made of any one of asphalt, sandy soil, cement and mixed pavement materials;
the surrounding building equivalent scaling model is made of any one of cement, concrete and brick-concrete structure materials;
the equivalent scaling model of the road participant is made of metal.
4. The intelligent network-connected automobile wireless communication performance test system according to claim 1, wherein the electromagnetic characteristic equivalent scaling model of the real use environment of the vehicle further comprises a tree equivalent scaling model and a lawn equivalent scaling model.
5. The intelligent network-connected automobile wireless communication performance test system according to claim 1, wherein the electromagnetic characteristic equivalent scaling model of the real use environment of the vehicle is determined according to the following formula:
wherein f M For equivalent test frequency f F The real working frequency of the vehicle-mounted wireless communication antenna of the vehicle to be tested is set; d (D) F For the real use environment size of the vehicle to be tested, D M And (5) equivalent scaling model size for electromagnetic characteristics of the real use environment of the vehicle to be tested.
6. The intelligent network-connected automobile wireless communication performance test system according to claim 1, wherein the equivalent test frequency is not lower than 25GHz.
7. The intelligent network-connected automobile wireless communication performance test system according to claim 2 or 5, wherein f M /f F The ratio of (2) is not lower than 8.
8. The intelligent network-connected automobile wireless communication performance test system according to claim 1, wherein the rotation range of the mechanical rocker arm is 0-90 degrees in pitch.
9. The intelligent network-connected automobile wireless communication performance test system according to claim 1, wherein the coordinate system of the test system is constructed as follows:
and taking the center point of the vehicle turntable as the coordinate origin of the test system, taking a plane parallel to the ground as an XY plane, and taking an axis perpendicular to the XY plane and facing to the upper part of the ground as a Z-axis forward direction.
10. The intelligent network-connected automobile wireless communication performance test system according to claim 1, wherein the coordinate system of the test system is constructed as follows:
and taking any point on a straight line perpendicular to the surface of the vehicle turntable at the center of the vehicle turntable as a coordinate origin of the test system, taking a plane parallel to the ground as an XY plane, and taking an axis perpendicular to the XY plane and facing to the upper part of the ground as a Z-axis forward direction.
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