CN113099473B - Simulation test method of vehicle-mounted short-distance communication network based on real-time traffic road conditions - Google Patents
Simulation test method of vehicle-mounted short-distance communication network based on real-time traffic road conditions Download PDFInfo
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Abstract
The invention provides a simulation test method of a vehicle-mounted short-distance communication network based on real-time traffic road conditions, which comprises the following steps: and after the road is restored according to the road static information and the longitude and latitude information, constructing road condition mapping based on the road dynamic information and the road restoration information to obtain a real-time traffic restoration scene. Setting up a plurality of dynamic test areas, and synchronously/asynchronously carrying out radio wave transmission performance test, data packet collision performance test and application scene test in each dynamic test area. The method has the advantage that the simulation of the real-time actual road scene corresponding to the V2X is realized by converting the real-time traffic information and the road information into the vehicle information of the actual road. The V2X algorithms are tested in real time under the actual road scene, simulation and performance testing are carried out on the actual scene of the actual road in different time periods and different areas, so that the performance of the algorithms under the actual road is obtained, and an approximately real testing environment is provided for the algorithms of V2X.
Description
Technical Field
The invention relates to the technical field of vehicle-mounted communication networks, in particular to a simulation test method of a vehicle-mounted short-distance communication network based on real-time traffic road conditions.
Background
The Vehicle-mounted short-distance communication (V2X) network is communication among vehicles, roads, workshops, outside vehicles and people and vehicles realized by short-distance communication technologies such as wireless communication, GPS/GIS, sensing and the like, the V2V can greatly improve the road safety, and the C-V2X (cellular V2X) has become an important component in the 5G standard. However, many new algorithms and technical solutions need to go through a large number of tests on actual roads to verify the feasibility of the actual roads and find problems to improve, which requires a large number of vehicles with V2X vehicle-mounted nodes to test on various actual roads and traffic conditions with road-side nodes. Because all vehicles in the whole area are required to be provided with V2X vehicle-mounted nodes for testing, some tests also require road side nodes for matching. A large number of vehicles provided with V2X equipment are gathered together and travel to an actual road for testing, so that the cost is huge, the limitation is great, and the period for obtaining the test result is long.
The test process in the prior art is as follows: setting various scenes, performing performance test on various algorithms in each scene through simulation software, and outputting and analyzing results, so that the performance of the various algorithms is obtained. The computer software simulation test is limited in that various specific scenes are simulated and then tested, the simulated scenes have great differences from the real traffic road conditions of the actual roads in different areas, the simulated results of the vehicle-mounted short-distance communication network under the simulated scenes are obtained, and the simulated results of the vehicle-mounted short-distance communication network under the real road scenes cannot be obtained.
Therefore, how to provide a method for testing a vehicle-mounted short-distance communication network in a real and real-time traffic scene is a problem to be solved.
Disclosure of Invention
The invention provides a simulation test method and device of a vehicle-mounted short-distance communication network based on real-time traffic conditions, which are used for testing the vehicle-mounted short-distance communication network in a real and real-time traffic scene.
In order to achieve the above purpose, the technical scheme of the present invention provides a simulation test method for a vehicle-mounted short-distance communication network based on real-time traffic conditions, comprising: and collecting road static information, and restoring the road according to the road static information and longitude and latitude information to obtain road restoration information. And acquiring road dynamic information, and constructing road condition mapping based on the road dynamic information and the road restoration information to obtain a real-time traffic restoration scene. Setting up a plurality of dynamic test areas in a real-time traffic restoration scene, and synchronously or asynchronously carrying out radio wave transmission performance test, data packet collision performance test and application scene test on each dynamic test area. The area of the dynamic test area is not more than twice the communication range of the vehicle-mounted node.
As an optimization of the above technical solution, preferably, collecting road static information, and restoring the road according to the road static information and longitude and latitude information, the obtaining road restoration information includes: and collecting the specified regional road information and the surrounding environment information of the public map. And drawing the contents included in the regional road information and the surrounding environment information according to the longitude and latitude information to generate road restoration information. The regional road information comprises the name of a road, the width of the road, the number and trend of lanes, traffic intersections and the direction of lanes at the traffic intersections; the surrounding environment information includes roadside building height, building type, and signal lights.
As an optimization of the above technical solution, preferably, collecting road dynamic information, constructing a road condition map based on the road dynamic information and the road restoration information to obtain a real-time traffic restoration scene, including: and acquiring real-time road traffic conditions at the longitude and latitude positions of the simulation points. And constructing a traffic condition map based on the system parameters, the number of lanes in the road restoration information, the lane direction at the traffic intersection and the real-time traffic road traffic condition, and obtaining a real-time traffic restoration scene. Wherein, the system parameters include: the number of vehicles in hundred meters corresponding to each traffic road condition, the types of vehicles corresponding to urban areas/suburban areas and the density of vehicles.
Preferably, the moving manner of the dynamic test area includes: a start point travel mode and a free travel mode are specified.
As a preferable aspect of the above-described technical solution, preferably, the radio wave transmission performance test includes: and classifying the occlusion type and the environment reflection type in the transmission scene, and manufacturing a typical environment model according to the classification result. And carrying out electric wave transmission environment matching on the vehicles in the dynamic test area in pairs, and matching corresponding typical environment models according to matching results. And after the channel model parameters of the models and the factors are combined, calculating path loss, shadow fading, small-scale fading, signal-to-noise ratio estimation coverage, transmission reliability and transmission delay according to the electric wave transmission parameters, and outputting a radio wave transmission performance test result. Wherein the number of the typical environment models is equal to the number of the categories in the classification result.
As a preferred aspect of the foregoing technical solution, preferably, the packet collision performance test includes: and further mapping the mapping relation and the mapping quantity of the vehicle quantity and the vehicle speed information included in the traffic condition mapping to the threads with the same quantity. Executing the tested channel allocation scheme, judging whether more than two vehicles exist on the same channel, if so, failing to send the data packet, counting the number of times of failed sending, obtaining the collision rate and reliability of the data packet through calculation, and comprehensively obtaining the collision performance test result of the data packet due to delay generated by collision.
As a preferred aspect of the above technical solution, preferably, the application scenario test includes: the method comprises the following steps of straight-line scene test, steering scene test, intersection auxiliary scene test, lane change scene test, and front collision early warning test in the straight-line scene test: after measuring parameters are set for vehicles in front of a target vehicle and in front of two sides of the target vehicle, according to signal intensity parameters, transmission reliability and transmission delay parameters in a radio wave transmission performance test result of the dynamic test area, testing the adjustment capability of V2X on the state of the target vehicle when the respective different vehicle speeds and driving states of the three vehicles in front are changed; wherein the measured parameters include: acceleration, deceleration, lane change, whether a rear vehicle is inserted, target vehicle acceleration, two-vehicle distance, weather conditions and road conditions;
the emergency brake lamp test in the straight scene test comprises the following steps: and carrying out emergency braking on each vehicle in the dynamic test area, and testing whether the rear vehicle of each vehicle can be timely decelerated and safely braked according to the wire wave transmission performance test result and the data packet collision performance test result.
As a preferable aspect of the foregoing technical solution, preferably, the steering application scenario mainly includes: the method for testing the forbidden early warning scenes comprises the following steps of: and according to the restored vehicle density and road width in the dynamic test area, according to the signal intensity parameter of the test area in the test result of the radio wave transmission performance and the reliability and delay parameter of the data packet in the test result of the data packet collision performance, testing the reliability and delay parameter sent to the target vehicle by V2X when the target vehicle overtakes the vehicle in the blind area, and recording the response time of the driver and calculating the accident probability. The test of the left turn auxiliary scene includes: according to the restored vehicle density and road width in the dynamic test area, combining the target vehicle speed and the vehicle speeds of vehicles around the target vehicle, further according to the test area signal intensity parameter in the test result of the wire wave transmission performance and the reliability and delay parameter of the data packet in the test result of the data packet collision performance, testing the early warning capability of the vehicle in the left turning blind area when the target vehicle turns left under the non-line-of-sight, including reminding and decelerating the target vehicle.
As a preferable aspect of the above technical solution, preferably, the intersection scene test includes: according to the restored vehicle density, road width and lane trend at the traffic intersection in the dynamic test area, according to the test area signal intensity parameter in the test result of the transmission performance of the radio waves and the reliability and delay parameter of the data packet in the test result of the collision performance of the data packet, testing whether V2X can early warn collision or not by combining the speed and acceleration of the target vehicle and the speed and acceleration of vehicles around the target vehicle under the non-line-of-sight condition, and if the early warn is successful, further testing whether V2X can brake the target vehicle or not.
As a preferable mode of the above technical solution, the lane change application scenario preferably includes: a blind area reminding/lane changing early warning scene, wherein each vehicle in the area is overtaken according to the restored vehicle density and vehicle speed in the dynamic test area, and whether overtaken can be successfully early warned on each vehicle under the condition of visual blind area in a non-visual range test environment by testing V2X according to the test area signal intensity parameter in the test result of the radio wave transmission performance and the reliability and delay parameter of the data packet in the test result of the data packet collision performance so as to obtain the reliability and timeliness of the V2X transmission data packet
The technical scheme of the invention provides a simulation test method of a vehicle-mounted short-distance communication network based on real-time traffic road conditions, which comprises the following steps: and restoring the road according to the road static information and the longitude and latitude information to obtain road restoration information. And constructing road condition mapping based on the road dynamic information and the road restoration information to obtain a real-time traffic restoration scene. In the scene, a plurality of dynamic test areas are set up, and each dynamic test area synchronously or asynchronously performs radio wave transmission performance test, data packet collision performance test and application scene test. The area of the dynamic test area is not more than twice the communication range of the vehicle-mounted node.
The method has the advantage that the simulation of the real-time actual road scene corresponding to V2X is realized by converting the real-time traffic information and the road information into the vehicle information of the actual road. The V2X algorithms are tested in real time under the actual road scene, simulation and performance testing are carried out on the actual scene of the actual road in different time periods and different areas, so that the performance of the algorithms under the actual road is obtained, and an approximately real testing environment is provided for the algorithms of V2X.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the prior art descriptions, and it is obvious that the drawings in the following description are some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an implementation framework of the technical scheme provided by the invention.
Fig. 2 is a schematic flow chart provided in an embodiment of the present invention.
Fig. 3 is a schematic flow chart II provided in the 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 technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic diagram of an implementation framework of the technical scheme provided by the present invention.
First, the road and surrounding information are grasped. And then, carrying out data processing on the grabbed information to acquire real-time traffic road conditions and restore scenes, and finally, carrying out performance testing on simulation scene mapping and V2X networks.
The technical solution of the present invention will be further described, and fig. 2 is a schematic flow chart provided by an embodiment of the present invention, as shown in fig. 2, including:
And step 201, collecting road static information, and restoring the road according to the road static information and longitude and latitude information to obtain road restoration information.
And collecting the road information and the surrounding environment information of the designated area in the public map. And arranging contents (data) included in the regional road information and the surrounding environment information according to longitude and latitude to generate road restoration information. The regional road information includes, but is not limited to, road name, road width, number and trend of lanes, traffic intersections, and lane directions at the traffic intersections; the surrounding environment information comprises roadside building height, building types and signal lamps.
And 202, collecting road dynamic information, and constructing road condition mapping based on the road dynamic information and the road restoration information to obtain a real-time traffic restoration scene.
The method comprises the steps of obtaining real-time road traffic conditions at longitude and latitude of a simulation point. And constructing a mapping according to the system parameters and the road restoration information to obtain a real-time traffic restoration scene. Specifically, after the number of lanes in the road restoration information and the lane direction at the traffic intersection are combined with the system parameters, the traffic situation is compounded with the real-time traffic road traffic situation in step 201, so that a traffic situation map is constructed, and finally, a real-time traffic restoration scene is obtained. Among the system parameters include, but are not limited to: the number of vehicles in hundred meters corresponding to each traffic road condition, the types of vehicles corresponding to urban areas/suburban areas and the density of vehicles.
Step 203, setting up a plurality of dynamic test areas and radio wave transmission performance tests and data packet collision performance tests in a real-time traffic restoration scene.
The radio wave transmission performance test and the data packet collision performance test between the dynamic test areas can be performed simultaneously or separately.
A radio wave transmission performance test comprising: classifying the occlusion type and the environment reflection type in the transmission scene, and manufacturing a corresponding typical environment model according to the classified category number. And carrying out electric wave transmission environment matching on the vehicles in the dynamic test area in pairs, and matching corresponding typical environment models on the vehicles according to the matching result. And after the channel model parameters of the models and the factors are combined, calculating path loss, shadow fading, small-scale fading, signal-to-noise ratio estimation coverage, transmission reliability and transmission delay according to the electric wave transmission parameters, and outputting a radio wave transmission performance test result.
A packet collision performance test comprising: and mapping the mapping relation and the mapping quantity of the number of vehicles and the speed information included in the traffic condition mapping to the threads with the same number. Executing the tested channel allocation scheme, judging whether more than two vehicles exist on the same channel, if so, failing to send the data packet, counting the number of times of failed sending, obtaining the collision rate and reliability of the data packet through calculation, and comprehensively obtaining the collision performance test result of the data packet due to delay generated by collision.
And 204, testing in the restored application scene by combining the test results.
The application scene test comprises the following steps: straight scene test, steering scene test, intersection auxiliary scene test, and lane change scene test.
The area of the dynamic test area is not larger than twice the communication range of the vehicle-mounted node. The moving mode of the dynamic test area comprises the following steps: a start point travel mode and a free travel mode are specified.
The invention is described in further detail below with reference to the drawings and examples, as shown in fig. 3:
step 301, road and surrounding information acquisition and restoration.
Specifically, road information may be obtained in two ways: 1. the method comprises the steps of obtaining environmental information of roads and surrounding areas of a designated area of a public map through a web crawler program, wherein the environmental information comprises names of the roads, the number of road lanes, the road traffic intersections and the trend of the lanes, and building size and height information of the roads along the way. 2. Road information is directly acquired through a road map, for example openstreetmap, and then building information around the road is acquired through a public map, for example, acquired through poi (points of interest).
In actual practice, one of the two modes can be selected, and the two modes can also be combined for use.
After the road information is obtained, the road and building data contained in the road information are arranged and stored according to the longitude and latitude sequence, and road and surrounding building patterns are dynamically drawn according to the road information according to the test requirement, so that the road and surrounding building information is restored.
Step 302, obtaining real-time traffic road conditions.
Specifically, road information may be obtained in two ways: 1. and acquiring the real-time road traffic condition of the current point through an API interface provided by the electronic map according to the longitude and latitude of the simulation point. 2. And (3) acquiring traffic conditions of the current point represented by the color shade by a map crawler, and marking different colors as different road congestion conditions. In actual practice, one of the two modes can be selected, and the two modes can also be combined for use.
And 303, restoring the real-time traffic scene.
According to the obtained real-time road traffic conditions, based on parameters set by the system (at least including the number of vehicles in hundred meters corresponding to different traffic conditions and the vehicle type distribution corresponding to urban areas/suburban areas), the different road traffic conditions are mapped into different scenes of different numbers, speeds and vehicle types of actual traffic conditions by combining the restored road information (the number of lanes and the traffic intersection lane direction) obtained in the step 301, so that scene restoration of the real-time road traffic conditions is completed.
Step 304, setting a dynamic test area.
And selecting a dynamic test area, wherein the size of the area is larger than the communication range D of the vehicle-mounted node and smaller than 2D, the area runs along the road by utilizing the road and peripheral information data acquired by the first part, and the vehicle information corresponding to the test range is filled into the dynamic test area by utilizing the real-time traffic road condition of the current point and performing scene restoration acquired by the step 302. The moving mode of the dynamic test area comprises the following steps: a start point travel mode and a free travel mode are specified. Designating a starting point travel mode: the dynamic test area is navigated from the start point to the end point. Free running mode: and randomly selecting the road in front after dynamically testing the area to the intersection. The embodiment can generate a plurality of dynamic test areas to test simultaneously.
The V2X test is mainly divided into: the method for testing the radio wave transmission performance, the data packet collision performance and the performance of the main application scenes (straight running, steering, intersection and lane changing) comprises the following steps:
step 305, simulating scene mapping and performance testing, and obtaining a test result.
Step 3051, performing a radio wave transmission performance test.
Specifically, the purpose of the radio wave transmission test is to test coverage, reliability and delay of V2X signal transmission under various road conditions and surrounding environments.
Firstly, classifying common transmission scenes, and manufacturing a typical environment model, wherein the shielding types are as follows: line of sight (LOS) scene transmission, metallic car body occlusion, non-line of sight (NLOS) low building occlusion, tall building occlusion. The reflection types are: ground reflection, building single path reflection, multipath reflection.
And according to the vehicle density restored by the dynamic test area and the environment around the road, carrying out electric wave transmission environment matching on the vehicles in the area, and obtaining a matched typical environment model after matching is completed. And carrying out channel model parameter combination on the matched typical environment model by using a plurality of matched model factors, and then respectively calculating path loss, shadow fading and small-scale fading according to the distance, the working frequency, different antenna installation positions of the vehicle-mounted nodes and antenna types, and simultaneously calculating dynamic delay and Doppler spectrum types. And according to the signal-to-noise ratio obtained by calculation, estimating the coverage area, the transmission reliability and the delay, and storing the related data.
Step 3052, testing collision performance of the data packet.
The embodiment is described by adopting a multithreading processing mode, specifically, each thread runs the same idle channel detection and occupation strategy, so as to simulate the performance of data packet collision, reliability and delay caused by different schemes under different vehicle densities under actual road scenes.
Mapping the number of vehicles and the speed of vehicles in the dynamic test area restored in the step 302 to the same number of threads, and then executing a tested channel allocation scheme after the electric wave transmission parameters obtained in the step 3051 are used as performance parameters of the vehicle transmission in the area in pairs: if more than two vehicles occupy the same channel, the collision is regarded as the failure of the current transmission. And counting the failed transmission, calculating the collision rate and reliability of the data packet, and further calculating the delay of the data packet caused by collision.
Under the condition that the number of vehicles in unit density is the same, the channel utilization rate and the data packet collision performance of the V2X channel allocation strategies of different schemes are also different.
And 306, performing the performance test of the main application scene according to the simulation scene mapping and the test result of the performance test.
The main application scene comprises: front collision early warning (FCW), emergency brake light (EEBL) in a straight ahead application scenario; forbidden passing early warning (DNPW), left Turn Assist (LTA) in a steering application scenario; intersection assistance (IMA) of an intersection assistance application scenario; blind zone reminding/lane change early warning (BSW+LCW) in lane change application scene.
Step 3061, front collision early warning scenario test (FCW): according to the vehicle density and road width restored in the dynamic test area, acceleration, deceleration, lane change, rear vehicle insertion and target vehicle acceleration are respectively set for the front vehicles and the two front vehicles in the dynamic test area, the two vehicles (target vehicles and front vehicles thereof), weather conditions (wind, rain, snow, fog, hail and sunny days), road surface conditions (road surface states and lane line types), and the processing capacity of V2X on different speeds of the front vehicles and the changed states of different driving states is tested according to the signal intensity parameters of the test area obtained by electric wave transmission in step 3051, the reliability and the delay parameters obtained by the collision performance test of the data packet in step 3052. Wherein the braking performance of the vehicle is set by the system for different vehicle types.
Step 3062, emergency brake light scene test (EEBL): and (3) according to the vehicle density and the running speed restored in the dynamic test area, carrying out emergency braking operation on each vehicle, and testing whether the vehicle (relative to the target vehicle) can be decelerated in time and braked safely by utilizing the V2X performance parameters obtained in the steps 3051 and 3052.
Step 3063, prohibit passing the early warning scene test (DNPW): according to the vehicle density and road width restored in the dynamic test area, the signal intensity parameter of the test area obtained by the electric wave transmission in step 3051, the reliability and delay parameter obtained by the collision performance test of the data packet in step 3052, the potential collision hazards of the vehicles beyond the front vehicles, which are vehicles outside the line of sight, are notified to the reliability and delay of the target vehicles through V2X, the response time of the driver, and the accident probability is calculated.
Step 3064, left turn auxiliary scene test (LTA): according to the reduced vehicle density, road width, target vehicle speed and surrounding vehicle speed in the dynamic test area, when the target vehicle turns left, the reliability of reminding the target vehicle and decelerating the target vehicle by V2X is detected according to the signal intensity parameter of the test area obtained by the electric wave transmission of step 3051 and the reliability and delay parameter obtained by the collision performance test of the data packet of step 3052 under the condition that the left incoming vehicle is not in sight distance.
Step 3065, intersection auxiliary scene test (IMA): according to the vehicle density restored in the dynamic test area and the road turning condition of the intersection, the road width, the signal intensity parameter of the test area obtained by the electric wave transmission in step 3051, the reliability and the delay parameter obtained by the collision performance test of the data packet in step 3052, and the safety performance of the intersection of each vehicle in the test area in a left-turning, right-turning and straight-going mode. Under the non-line-of-sight condition, testing whether V2X can pre-warn the dangerous factors according to the speeds and accelerations of the target vehicle and surrounding vehicles, and reliably braking.
Step 3066, blind area reminding/lane changing early warning scene test (bsw+lcw): and according to the reduced vehicle density and vehicle speed in the dynamic test area, overtaking operation is carried out on each vehicle in the dynamic test area, and according to the signal intensity parameter of the test area obtained by electric wave transmission in step 3051 and the reliability and delay parameter obtained by the collision performance test of the data packet in step 3052, the reliability and the timeliness of V2X can be tested by timely early warning when the vehicle overtakes under the condition that the non-line-of-sight test vehicle has a visual blind area.
For the test of V2I (vehicle-road side node), road side nodes can be arranged at traffic intersections in a map or in hot spot areas, the construction of the road side nodes is the same as that of vehicle-mounted nodes, but the antenna deployment position is high, the coverage range is large, so that parameters can be properly adjusted, and similar tests can be carried out.
The result is continuously stored in a database along with the movement of the dynamic test area, and after the test is finished, statistical analysis is carried out on the test data stored in the process, and a test report is output.
The technical scheme of the invention provides a simulation test method of a vehicle-mounted short-distance communication network based on real-time traffic road conditions, which comprises the following steps: and restoring the road according to the road static information and the longitude and latitude information to obtain road restoration information. And constructing road condition mapping based on the road dynamic information and the road restoration information to obtain a real-time traffic restoration scene. In the scene, a plurality of dynamic test areas are set up, and each dynamic test area synchronously or asynchronously performs radio wave transmission performance test, data packet collision performance test and application scene test. The area of the dynamic test area is not more than twice the communication range of the vehicle-mounted node.
The method has the advantage that the simulation of the real-time actual road scene corresponding to V2X is realized by converting the real-time traffic information and the road information into the vehicle information of the actual road. The V2X algorithms are tested in real time under the actual road scene, simulation and performance testing are carried out on the actual scene of the actual road in different time periods and different areas, so that the performance of the algorithms under the actual road is obtained, and an approximately real testing environment is provided for the algorithms of V2X.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (4)
1. A simulation test method of a vehicle-mounted short-distance communication network based on real-time traffic road conditions is characterized by comprising the following steps:
Collecting road static information, and restoring the road according to the road static information and longitude and latitude information to obtain road restoration information;
Acquiring road dynamic information, and constructing road condition mapping based on the road dynamic information and the road restoration information to obtain a real-time traffic restoration scene;
Setting a plurality of dynamic test areas in a real-time traffic restoration scene, wherein each dynamic test area synchronously or asynchronously performs radio wave transmission performance test, data packet collision performance test and application scene test;
The radio wave transmission performance test includes:
Classifying the occlusion type and the environment reflection type in the transmission scene, and manufacturing a typical environment model according to the classification result;
Performing electric wave transmission environment matching on the vehicles in the dynamic test area in pairs, and matching corresponding typical environment models according to matching results;
After the channel model parameters of the models and the factors are combined, path loss, shadow fading, small-scale fading, signal-to-noise ratio estimation coverage, transmission reliability and transmission delay are calculated according to the electric wave transmission parameters, and a radio wave transmission performance test result is output;
the number of the typical environment models is equal to the number of the categories in the classification result;
the data packet collision performance test comprises the following steps:
The mapping relation and the mapping quantity of the vehicle quantity and the vehicle speed information included in the traffic condition mapping are further mapped to threads with the same quantity, and specifically, each thread runs the same idle channel detection and occupation strategy and is used for simulating the performance of data packet collision, reliability and delay caused by different schemes under the actual road scene under different vehicle densities; executing a tested channel allocation scheme, judging whether more than two vehicles exist on the same channel, if so, failing to send the data packet, counting the number of times of failed sending, obtaining the collision rate and reliability of the data packet through calculation, and comprehensively obtaining the collision performance test result of the data packet due to delay generated by collision of the data packet;
the application scenario test comprises the following steps: straight scene test, steering scene test, intersection auxiliary scene test, lane change scene test,
The front collision early warning test in the straight-going scene test comprises the following steps: after measuring parameters are set for vehicles in front of a target vehicle and in front of two sides of the target vehicle, according to signal intensity parameters, transmission reliability and transmission delay parameters in a radio wave transmission performance test result of the dynamic test area, testing the adjustment capability of V2X on the state of the target vehicle when the respective different vehicle speeds and driving states of the three vehicles in front are changed; wherein the measured parameters include: acceleration, deceleration, lane change, whether a rear vehicle is inserted, target vehicle acceleration, two-vehicle distance, weather conditions and road conditions;
the emergency brake lamp test in the straight scene test comprises the following steps: performing emergency braking on each vehicle in the dynamic test area, and testing whether a rear vehicle of each vehicle can be timely decelerated and safely braked according to the wire wave transmission performance test result and the data packet collision performance test result;
the steering scenario includes: the passing of the early warning scene and the left turning auxiliary scene is forbidden,
The test for the forbidden passing early warning scene comprises the following steps: according to the restored vehicle density and road width in the dynamic test area, according to the test area signal intensity parameter in the test result of the radio wave transmission performance and the reliability and delay parameter of the data packet in the test result of the data packet collision performance, testing the reliability and delay parameter sent to the target vehicle by V2X when the target vehicle overtakes the vehicle in the blind area, and recording the response time of the driver and calculating the accident probability;
The testing of the left turn auxiliary scene comprises: according to the restored vehicle density and the road width in the dynamic test area, combining the target vehicle speed and the vehicle speeds of vehicles around the target vehicle, further according to the test area signal intensity parameter in the test result of the wire wave transmission performance and the reliability and delay parameter of the data packet in the test result of the data packet collision performance, testing the early warning capability of the target vehicle in a left-turn blind area when the target vehicle turns left under a non-line-of-sight, including reminding and decelerating the target vehicle;
The intersection auxiliary scene test comprises the following steps: according to the restored vehicle density, the road width and the lane trend at the traffic intersection in the dynamic test area, according to the test area signal intensity parameter in the test result of the wire wave transmission performance and the reliability and delay parameter of the data packet in the test result of the data packet collision performance, testing whether V2X can early warn the collision or not under the non-line-of-sight condition by combining the speed and acceleration of the target vehicle and the speed and acceleration of vehicles around the target vehicle, and if the early warn is successful, further testing whether V2X can brake the target vehicle or not;
The lane change application scene comprises: a blind area reminding/lane changing early warning scene, wherein each vehicle in the area is overtaken according to the restored vehicle density and vehicle speed in the dynamic test area, and whether each vehicle is overtaken successfully under the condition of visual blind areas in a non-visual range test environment or not is tested according to the test area signal intensity parameter in the radio wave transmission performance test result and the reliability and delay parameter of the data packet in the data packet collision performance test result so as to obtain the reliability and timeliness of the V2X transmission data packet;
the area of the dynamic test area is not larger than twice the communication range of the vehicle-mounted node.
2. The simulation test method of the vehicle-mounted short-distance communication network based on the real-time traffic road condition according to claim 1, wherein the collecting the road static information, and restoring the road according to the road static information and the longitude and latitude information, and obtaining the road restoration information comprises:
collecting the appointed regional road information and the surrounding environment information of the public map;
Drawing the contents included in the regional road information and the surrounding environment information according to the longitude and latitude information to generate road restoration information;
the regional road information comprises the name, the road width, the number and the trend of lanes, traffic intersections and the lane directions at the traffic intersections; the surrounding environment information comprises roadside building height, building types and signal lamps.
3. The simulation test method of the vehicle-mounted short-distance communication network based on the real-time traffic road condition according to claim 1, wherein the collecting road dynamic information, constructing road condition mapping based on the road dynamic information and the road restoration information to obtain the real-time traffic restoration scene comprises the following steps:
Acquiring real-time road traffic conditions at longitude and latitude positions of the simulation points;
constructing traffic condition mapping based on system parameters, the number of lanes in the road restoration information, the lane direction at the traffic intersection and the real-time road traffic conditions, and obtaining the real-time traffic restoration scene;
Wherein the system parameters include: the number of vehicles in hundred meters corresponding to each traffic road condition, the types of vehicles corresponding to urban areas/suburban areas and the density of vehicles.
4. The simulation test method of the vehicle-mounted short-distance communication network based on the real-time traffic road conditions according to claim 2 or 3, wherein the moving mode of the dynamic test area comprises the following steps: a start point travel mode and a free travel mode are specified.
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