Radar moving target radon-fractional Fourier transform long-time phase-coherent accumulation detection method

A fractional Fourier, coherent accumulation technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of uncomfortable signal processing, signal accumulation efficiency and low signal noise, affecting the accumulation effect, etc., to improve the output signal noise ( noise) ratio, suppressing background clutter and noise, and improving estimation accuracy

CN103176178AActive Publication Date: 2013-06-26NAVAL AVIATION UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2013-06-26

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Abstract

The invention relates to a radar moving target Radon-fractional Fourier transform (RFRFT) long-time phase-coherent accumulation detection method, and belongs to the technical field of radar signal processing and detection. The radar moving target Radon-fractional Fourier transform long-time phase-coherent accumulation detection method includes steps of 1), performing range demodulation and pulse pressure for radar echo to complete intra-pulse accumulation; 2), initializing parameters; 3), completing long-time inter-pulse phase-coherent accumulation by RFRFT compensation distance and Doppler frequency migration; 4), traversing all search parameters and creating a distance-RFRFT domain detection unit graph; 5), performing constant false alarm rate detection for the detection unit graph; and 6), estimating movement parameters of a target and outputting movement point traces. The radar moving target Radon-fractional Fourier transform long-time phase-coherent accumulation detection method has the advantages that amplitude information and phase information of the echo of the moving target are simultaneously utilized for long-time phase-coherent accumulation, the distance and the Doppler frequency migration in a long-time accumulation procedure are compensated, background clutter and noise are effectively suppressed, an accumulation gain is increased, dim moving targets in the heavy cluster can be detected, the movement point traces of the target can be acquired, and the method has popularization and application value.
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Description

1. Technical field

[0001] The invention belongs to the technical field of radar signal processing and detection. More specifically, the invention relates to a radar moving target Radon-fractional Fourier transform long-term coherent accumulation detection method, which can be used for radar detection of weak moving targets in complex environments deal with. 2. Background technology

[0002] With the development of science and technology, especially the continuous development of high-speed targets and the increasing maturity of stealth technology, robust and effective radar moving target detection has always been a difficult problem in the field of radar signal processing. Research on signal processing to improve the ability of radar to detect weak moving targets method is important. The complexity of target detection not only comes from the target itself, but also is affected by the increasingly complex electromagnetic environment and clutter background. There are many type...

Examples

Embodiment Construction

[0027] In order to explain the range migration and Doppler migration effects involved in the present invention, the following derivation is first made.

[0028] In order to obtain high resolution and reduce the effective bandwidth, it is assumed that the coherent system radar transmits a linear frequency modulation (Linear Frequency Modulation, LFM) signal

[0029] s t ( t ) = rect ( t T p ) exp { j 2 π [ f c t + 1 2 kt 2 ] }

[0030] In the formula, rect ( u ) = ...