ISAR imaging method based on matching tracking

A technology of matching tracking and imaging methods, applied in the field of ISAR imaging based on matching tracking, can solve the problems of ISAR two-dimensional imaging bias, low accuracy, signal processing loss, etc., and achieve the effect of accurate distance alignment and high precision.

Active Publication Date: 2015-06-03
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, the distance alignment method based on minimum entropy has three main defects: first, the method of minimum entropy needs to perform pulse compression on the original echo data, and pulse pressure will introduce signal processing loss; second, the signal envelope based on minimum entropy The performance of the alignment method will decrease in t...

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  • ISAR imaging method based on matching tracking

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Embodiment Construction

[0036] like figure 1 As shown, the present invention proposes a kind of ISAR motion compensation method based on matching pursuit, and this method comprises the following steps:

[0037] Step 1, performing Fourier transform in the range direction on the received echo data;

[0038] Received echo data s(t,t m ) is a matrix of M×N, expressed as s(t,t m )=s(t-2R(t m ) / c); where s(t) is the transmitted signal, t is the moment in the distance direction, and the distance direction sampling period is set as T s , the sampling frequency is f s , take N sampling points, then t=0,T s ,...,(N-1)T s ;t m is the moment in the azimuth direction, and the time interval between two pulses transmitted continuously is T m , taking the echo data of M frames, then t m =0,T m ,...,(M-1)T m ; R(t m ) represents the azimuth direction t m The distance between the flying target and the receiver at all times, c represents the speed of light.

[0039] For echo data s(t,t m ) to obtain S(ω,...

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Abstract

The invention discloses an ISAR imaging method based on matching tracking, and solves the problem of echo data distance alignment in IASR imaging. The ISAR imaging method comprises the following steps: performing Fourier transform on received echo data in a distance direction; 2, achieving matching tracking on a continuous parameter space by virtue of Chebyshev polynomials construction atoms by using a simulation annealing algorithm, thereby obtaining atoms in optimal matching with echo data; 3, performing motion compensation on the echo data by using the optimal atoms; 4, performing inverse Fourier transform on the echo data in the distance direction, and recovering into a time-domain signal; 5, imaging the echo data by using a self-focusing method. By adopting the ISAR imaging method, a relatively good motion compensation effect can be achieved, and high-resolution ISAR imaging can be achieved.

Description

technical field [0001] The invention belongs to the field of signal processing, in particular to an ISAR imaging method based on matching pursuit. Background technique [0002] Inverse synthetic aperture radar (ISAR) is a two-dimensional high-resolution imaging technology. ISAR is based on the principle of turntable imaging. The key technology to convert moving targets into turntable targets is motion compensation, and the non-cooperative nature of detection targets increases. Difficulty of motion compensation. [0003] At present, a commonly used ISAR imaging technology uses the minimum entropy method to perform envelope alignment on the echo data after the pulse pressure, and then adopts the self-focusing method for imaging. Range alignment is the main part of ISAR imaging motion compensation. The distance alignment method based on minimum entropy is a data-based motion compensation method. It can adaptively complete the distance alignment through iteration and has good r...

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9064G01S13/9019
Inventor 任丽香李枫曹军范花玉龙腾
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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