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Quick implementation method for passive radar range migration compensation

A technology of external radiation source radar and distance migration, which is applied in the direction of using re-radiation, radio wave reflection/re-radiation, measuring devices, etc., and can solve the problems of distance migration phenomenon accumulation gain reduction and other problems

Inactive Publication Date: 2014-09-24
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0013] The purpose of the present invention aims at the problem that the accumulation gain is reduced due to the long-term coherent accumulation and the phenomenon of distance migration that occurs when the external radiation source radar system detects weak targets, and proposes a fast method for external radiation source radar distance migration compensation. Implementation

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  • Quick implementation method for passive radar range migration compensation
  • Quick implementation method for passive radar range migration compensation
  • Quick implementation method for passive radar range migration compensation

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Embodiment Construction

[0073] The present invention will be described in further detail below with reference to specific examples and accompanying drawings.

[0074] In the external radiation radar system, the direct wave antenna receives the direct wave signal, and the echo antenna receives the TV echo signal reflected by the target.

[0075] Experimental parameters: The carrier frequency of the signal transmitted by the CCTV broadcasting tower is f c = 674MHz, bandwidth B = 7.56MHz, baseband sampling rate f s =10MHz, coherent accumulation time T s =1s, the length of the low-pass filter coefficient P = 21, and the coefficient is:

[0076] h(l)=[0.0000,0.0036,-0.0000,-0.0122,0.0000,0.0343,-0.0000,

[0077] -0.0858,0.0000,0.3106,0.4991,0.3106,0.0000,-0.0858,-0.0000,

[0078] 0.0343,0.0000,-0.0122,-0.000,0.0036,0.0000]

[0079] The number of sampling points in the slow time dimension is the number of segments N=2500, and the number of non-overlapping sampling points in each segment is f s T s / ...

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Abstract

The invention relates to a quick implementation method for passive radar range migration compensation and belongs to the technical field of radar target detection. The method comprises the following steps: (1) a direct wave signal and an echo signal received by a passive radar antenna are segmented and rearranged into two-dimensional matrices; (2) each row of the direct wave and the echo wave is transformed to the frequency domain; (3) the transformed direct wave matrix is multiplied by the conjugate transpose of the transformed echo wave matrix; (4) each row is extracted after being processed by a low-pass filter; (5) each column is subjected to CZT; and (6) each row is transformed to the time domain, and a cross-ambiguity function result subjected to migration compensation is obtained. Compared with a conventional range migration compensation method based on CZT and IFFT to achieve keystone transform, the provided method reduces operation steps and the amount of computation substantially while the gain accumulated is almost the same.

Description

technical field [0001] The invention relates to a rapid realization method of radar distance migration compensation of an external radiation source, and belongs to the technical field of radar target detection. Background technique [0002] External radiation source radar is a special dual (multi-) base passive radar system, which does not transmit signals, but uses non-cooperative radiation sources (such as radio, television, communication signals, etc.) to locate and track targets. Since the echo of the long-distance target is very weak, it is usually overwhelmed by noise and residual after cancellation, so long-term coherent accumulation is needed to improve the accumulation gain. Usually, when the accumulation time is small, with the extension of the accumulation time, the accumulation gain increases continuously, and the detection power of the radar also increases. When the accumulation time reaches a certain value, the changes in the position and motion state of the t...

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/2923G01S13/582G01S7/2883
Inventor 单涛陶然冯远张志鹏
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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