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Modified FRFT (fractional Fourier transform) maneuvering weak target detection method

A fractional-order Fourier transform and weak target detection technology, which is applied in measuring devices, radio wave measurement systems, radio wave reflection/reradiation, etc., can solve problems such as poor compensation effect and insufficient signal-to-noise ratio

Active Publication Date: 2014-03-26
盐城市凤凰园科技发展有限公司
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Problems solved by technology

[0003] Aiming at the problems of distance migration, Doppler frequency migration, insufficient signal-to-noise ratio and poor compensation effect in the existing radar maneuver weak target detection, the present invention proposes an improved fractional Fourier transform maneuver Weak Object Detection Method

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  • Modified FRFT (fractional Fourier transform) maneuvering weak target detection method
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  • Modified FRFT (fractional Fourier transform) maneuvering weak target detection method

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Embodiment Construction

[0032] like figure 1 As shown, an improved Fractional Fourier Transform method of the present invention to detect weak targets, the method specifically includes the following steps:

[0033] Step 1. Establish the maneuvering weak target echo signal model S(t',t m ).

[0034] (1) The radar emits a chirp pulse, and its mathematical expression is:

[0035] p ( t ) = rect ( t T p ) exp ( - jπγ t 2 ) - - - ( 1 )

[0036] Among them, u is a variable, when , rect(u)=1, when u is other, rect(u)=0, t is time, B is pulse width, T p is the pulse duration. modulation frequency

[0037] (2), then the...

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Abstract

The invention discloses a modified FRFT (fractional Fourier transform) maneuvering weak target detection method. The method includes: establishing a high-speed maneuvering weak target uniformly accelerated motion signal model; performing FT on echo original data in a fast time-domain, performing Keystone transform on the transformed data, correcting the problem of movements of distance units, caused by primary phase, performing IFFT (inverse fast Fourier transform) in the fast time-domain, solving all-order FRFT in p[0, 2] for all distance units in the obtained final echo data to generate signal energy which is in two-dimensional distribution in a two-dimensional parameter plane (p, u) composed of fractional order p and fractional order transform domain u, and performing peak point two-dimensional search on the plane so as to detect accelerated targets. Through the application of the method, maneuvering weak targets can be detected in the low signal-noise ratio background environment and reliability, feasibility and timeliness are good.

Description

technical field [0001] The invention belongs to the field of radar signal processing and relates to an improved fractional-order Fourier transform maneuvering weak target detection method. Background technique [0002] At present, the signal processing of airborne early warning radar often adopts the long-term coherent accumulation method to increase the energy of the actual target echo signal and improve the detection performance of the radar. The traditional coherent accumulation is all done by FFT, the premise is that within the beam dwell time, the target is approximately moving in a straight line at a constant speed, the Doppler frequency is constant, and the echo envelope does not move more than a range gate. But for the target with weak radar maneuverability, because the target may have strong maneuverability, the Doppler frequency is no longer constant in the whole accumulation process, and there is not only distance migration, but also Doppler frequency migration. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/02G01S13/50
CPCG01S7/02G01S7/411G01S13/50G01S7/2883
Inventor 郭云飞周森山
Owner 盐城市凤凰园科技发展有限公司
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