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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 coherent detection-before-tracking algorithm in order to achieve good detection performance, so the amount of data processing is large

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

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Embodiment Construction

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

[0071] Step 1. Initialization of relevant parameters of the multi-frame coherent accumulation target detection and tracking method based on Keystone transformation.

[0072] The parameters that need to be initialized in this method are as follows: the carrier frequency f of the radar transmitted pulse c =1GHz; Radar transmit pulse repetition time T=125ms; The bandwidth B=7.5MHz of radar transmit pulse; The frequency modulation slope b=1500GHz / s of radar transmit pulse; The duration T of radar transmit pulse p =0.5μs; the distance resolution of the radar δ r =10m; the radar data frame number K=3 of coherent processing; the azimuth direction number N=20 that the radar scan space is divided into; the pulse number M=16 that the radar transmits in each azimuth direc...

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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 ...

Claims

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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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