Multi-frame phase coherence accumulation target tracking-before-detecting method

A multi-frame coherent accumulation and target detection technology, which is applied in the directions of measurement devices, radio wave measurement systems, radio wave reflection/re-radiation, etc., can solve the problem of large data processing volume

Inactive Publication Date: 2011-05-25
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

The traditional non-coherent detection-before-tracking algorithm requires more frames of echo data to accumulate than the cohere

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  • Multi-frame phase coherence accumulation target tracking-before-detecting method
  • Multi-frame phase coherence accumulation target tracking-before-detecting method
  • Multi-frame phase coherence accumulation target tracking-before-detecting method

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[0070] The present invention mainly adopts computer simulation method for verification, and all steps and conclusions are verified correctly on MATLAB-R2009a. The specific implementation steps are as follows:

[0071] Step 1. Multi-frame coherent accumulation based on Keystone transform and initialization of relevant parameters of the tracking method before target detection.

[0072] The parameters that need to be initialized in this method are as follows: The carrier frequency of the radar transmitting pulse f c =1GHz; radar emission pulse repetition time T=125ms; radar emission pulse bandwidth B=7.5MHz; radar emission pulse frequency modulation slope b=1500GHz / s; radar emission pulse duration T p =0.5μs; range resolution of radar δ r =10m; the number of radar data frames processed by the coherent K=3; the number of azimuths into which the radar scanning space is divided into N=20; the number of pulses emitted by the radar in each azimuth direction M=16; Sampling frequency f s =15...

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Abstract

The invention discloses a Keystone transform-based multi-frame phase coherence accumulation target tracking-before-detecting method. Distance walk of target echo in multi-frame radar data is corrected by using Keystone transform, the quadratic term of a target echo phase is estimated and compensated by using discrete chirp Fourier transform (DCFT) to utilize the phase information of the target echo, and the output signal-to-noise ratio is improved by multi-frame echo phase coherence accumulation so as to realize detection of a weak target. Compared with the traditional non-phase coherence tracking-before-detecting method, the method can effectively realize the detection of the weak target under the echo data of reduced frame number, improves the detection efficiency, provides position and motion information of the target at the same time of detecting, and realizes tracking of the target.

Description

Technical field: [0001] The invention belongs to the technical field of target detection and tracking in radar systems, and particularly relates to the technical field of radar detection and tracking of weak targets under the condition of low signal-to-noise ratio. Background technique: [0002] With the continuous development and improvement of stealth technologies such as the use of absorbing materials and changing the geometric shape of objects, the radar target reflection area (RCS) capability of radar detection targets (such as aircraft and missiles) has been reduced by several orders of magnitude. This poses a serious challenge to the radar to detect targets and improve its own survivability. Therefore, the detection and tracking of weak targets has become an important research direction of radar. In previous studies, it is known that by prolonging the pulse accumulation time to improve the signal-to-noise ratio, the detection ability of radar for weak targets can be ...

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Application Information

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IPC IPC(8): G01S13/66G01S7/41
Inventor 张晓玲王昆
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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