A real-time estimation method of rcs for automotive radar targets

An automotive radar and target technology, applied in the field of automotive intelligence, can solve problems such as application limitations, high cost, and long cycle time, and achieve the effects of reduced calculation, real-time estimation, and high accuracy

Inactive Publication Date: 2019-01-22
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods for obtaining the target RCS mainly include experimental measurement and simulation estimation. The application of experimental measurement is limited due to problems such as long period and high cost. Although RCS simulation estimation has been supported by classical theories, the existing estimation theory is only applicable to the "far-field" mode. , it is impossible to "directly transplant" to estimate the RCS of automotive radar targets; in addition, the existing estimation theory usually adopts the idea of ​​"finite element", and for "electrically large-sized" targets, the amount of calculation will be very large, and real-time estimation cannot be realized

Method used

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  • A real-time estimation method of rcs for automotive radar targets
  • A real-time estimation method of rcs for automotive radar targets
  • A real-time estimation method of rcs for automotive radar targets

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Establish a scene where the target traffic vehicle is driving on the ring road, and record the RCS value in real time. This scene tests the influence of the horizontal angle change on the RCS.

[0051] Such as figure 2 As shown, the main vehicle equipped with radar is parked at 0 degrees, the target traffic vehicle Mazda starts from 0 degrees, drives at a constant speed of 20km / h to the 45 degrees position, and records the RCS value every 2.5 degrees. For circular road conditions, the model estimated value is compared with the commercial software FEKO simulation value, see image 3 , the average absolute difference between the model estimated value and the FEKO simulated value is 0.132, indicating that the estimation method of the present invention has better accuracy.

Embodiment 2

[0053] Establish a scene where the target vehicle is driving up and downhill, and record the RCS value in real time. In this scene, the influence of the pitch angle change on the RCS is tested.

[0054] Such as Figure 4 As shown, the uphill road section is 100m long and the slope angle is 30 degrees. The main vehicle equipped with radar is parked at the starting point (lowest point). The target traffic vehicle Mazda starts from the starting point and drives uphill at a constant speed of 5m / s, and reaches the uphill road in 20s. At the highest point of the section, the RCS value is recorded every 4s during the uphill process.

[0055] Such as Figure 4 As shown, the downhill road section is 100m long and the slope angle is 30 degrees. The main vehicle equipped with radar is parked at the starting point (the highest point). The target traffic vehicle Mazda starts from the starting point and drives downhill at a constant speed of 5m / s, and reaches the downhill road in 20s. At ...

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Abstract

The invention discloses an RCS (radar cross-section) real-time estimation method for a vehicle radar target. The method specifically includes the following steps that: a geometric model of a target under moving trajectories is constructed, and the surface of the target is divided into a plurality of simple surface elements according to the two-dimensional curvature of the surface of the target; as for each simple surface element, the incidence directions of incident waves are decomposed, and the incidence directions of the incident waves are decomposed into a vertical simple surface element incidence direction and a parallel simple surface element incidence direction, and the influence of incident waves of which the incidence direction is the parallel simple surface element incidence direction, on an RCS, can be neglected; and the projection area A, reflectivity R and directional coefficient D of each simple surface element are calculated, the RCS value of each simple surface element is calculated according to a formula, and the RCS values of the simple surface elements are superposed, so that the RCS value of the target can be obtained. Compared with the prior art, the computation amount of the method of the invention is greatly reduced, and real-time estimation of the vehicle radar target can be realized. As verified by an experiment, the estimation method of the invention has high accuracy.

Description

technical field [0001] The invention belongs to the technical field of automobile intelligence, and in particular relates to a real-time estimation method for an automobile radar target RCS. Background technique [0002] Radar is a device that uses electromagnetic waves for detection and measurement. Its performance is not only related to the radar itself, but also restricted by factors such as the target and the background environment. The target radar cross section RCS (Radar CrossSection, RCS) is an important parameter to measure the target scattering characteristics, and the intensity of backscattered energy is generally used to define the target RCS. The target RCS is mainly related to the target's structure and surface medium, radar frequency, polarization mode and target attitude angle and other factors. [0003] With the development of smart cars, radars need to be installed on smart cars for detection and collision avoidance. In the process of automotive radar det...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G01S7/41G01S13/93
CPCG01S7/418G01S13/931
Inventor李鑫邓伟文
OwnerJILIN UNIV