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Steering vector detection method in multipath condition

A technology of steering vector and detection method, which is applied in measurement devices, re-radiation of electromagnetic waves, radio wave measurement systems, etc., can solve problems such as the decline of vector detection performance, and achieve the effect of improving radar detection performance and wide application range

Active Publication Date: 2019-11-05
NAT UNIV OF DEFENSE TECH
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AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the performance of steering vector detection decreases under traditional multipath conditions, the purpose of the present invention is to provide a method for detecting steering vectors suitable for multipath situations, so as to improve target detection performance and its practical value

Method used

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  • Steering vector detection method in multipath condition
  • Steering vector detection method in multipath condition
  • Steering vector detection method in multipath condition

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Embodiment Construction

[0061] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0062] figure 1 It is a schematic diagram of the application scene of the present invention. In the figure, the radar is fixedly placed. The echo is composed of line-of-sight signals and multipath echo signals. The beam can cover the mirror position and target position.

[0063] figure 2 It is a flowchart of the present invention. A steering vector detection method under multipath conditions, comprising the following steps:

[0064] S1. Determine the signal steering vector form according to the application background

[0065] Select the form of the steering vector p according to the application scenario, where the form of the steering vector p is selected according to the following conditions:

[0066] If it is necessary to detec...

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Abstract

The invention belongs to the field of radar target detection, and discloses a steering vector detection method in a multipath condition. The method comprises the steps that firstly, hypothetical testproblem in the multipath condition is established, in the multipath condition, a signal echo may have both sight distance signal components and multipath signal components, the signal components may be in the same distance unit or in different distance units, and the number of multipath signals may be one or more; then a maximum likelihood estimation method is used for estimating amplitudes of allcomponent signals, estimated values of unknown parameters are used for replacing the unknown parameters, then log likelihood ratios are solved, and a noise clutter covariance matrix is estimated to finally obtain a self-adaptive detector expression. A detector does not depend on a specific signal form, and can utilize multiple dimensions, multiple multipath echoes and multipath signals of different distance units to improve the detection performance.

Description

technical field [0001] The invention belongs to the field of radar target detection and relates to a method for detecting steering vectors under multipath conditions. Background technique [0002] Radar target detection is the basic function of radar. Based on some optimal criteria, the detector is designed and the detection threshold is determined to determine whether there is a target signal in the echo, and then determine whether there is a target in a certain distance, speed and direction. The commonly used optimal criterion is the NP criterion, that is, under the condition of constant false alarm probability (the probability of judging that there is a target when there is no target), the detection probability (the probability of judging that there is a target when there is a target) is maximized. To judge whether there is a target in a certain direction, a certain distance and speed, it is necessary to detect its corresponding steering vector. [0003] The detection p...

Claims

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Application Information

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IPC IPC(8): G01S13/04G01S13/56G01S17/02G01S17/50
CPCG01S13/04G01S13/56G01S17/50
Inventor 范崇祎黄晓涛曹春杜华贵
Owner NAT UNIV OF DEFENSE TECH
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