An Improved Fractional Fourier Transform Mobility 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 insufficient signal-to-noise ratio and poor compensation effect

Active Publication Date: 2016-03-09
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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  • An Improved Fractional Fourier Transform Mobility Weak Target Detection Method
  • An Improved Fractional Fourier Transform Mobility Weak Target Detection Method
  • An Improved Fractional Fourier Transform Mobility Weak Target Detection Method

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Embodiment Construction

[0032] Such as 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 ...

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Abstract

The invention discloses an improved fractional Fourier transform maneuver weak target detection method. The present invention first establishes the uniform acceleration motion signal model of the high-speed maneuvering weak target; then performs Fourier transform on the original echo data in the fast time domain, and after the transformed data undergoes Keystone transformation, the problem of distance unit walking caused by the primary phase is corrected, Then IFFT is performed in the fast time domain, and the FRFT of all orders in p[0,2] is calculated for each range unit in the final echo data obtained to form the signal energy in the fractional order p and fractional order transformation domain u constitutes the two-dimensional distribution of the two-dimensional parameter plane (p, u), and the two-dimensional search of the peak point on this plane can realize the detection of accelerated targets. The invention can realize the detection of the weak maneuvering target in the background environment of low signal-to-noise ratio, and has good reliability, feasibility and real-time performance at the same time.

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 Patents(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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