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Stretching nonlinear scaling method for imaging processing of forward squint-looking sub-aperture of synthetic aperture radar

A synthetic aperture radar and imaging processing technology, which is applied in the field of extended nonlinear scaling, can solve the problems of reduced imaging processing efficiency and large amount of imaging result data, etc.

Inactive Publication Date: 2010-09-01
BEIHANG UNIV
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Problems solved by technology

However, the amount of data processed in the azimuth direction of the nonlinear scaling method has an expansion of 2 to 16 times compared to the amount of data sampled in the true azimuth direction, resulting in a huge reduction in imaging processing efficiency
At the same time, the amount of imaging result data is large

Method used

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  • Stretching nonlinear scaling method for imaging processing of forward squint-looking sub-aperture of synthetic aperture radar
  • Stretching nonlinear scaling method for imaging processing of forward squint-looking sub-aperture of synthetic aperture radar
  • Stretching nonlinear scaling method for imaging processing of forward squint-looking sub-aperture of synthetic aperture radar

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Embodiment Construction

[0045] The present invention will be further described in detail in conjunction with the accompanying drawings and simulation examples.

[0046] The present invention is an extended nonlinear scaling method suitable for synthetic aperture radar forward squint imaging processing. The method operates in the signal processing system of a radar signal processor. The specific extended nonlinear scaling method includes the following processing steps:

[0047] Step 1: The signal processing system processes the echo signal E C Perform azimuth Fourier transform processing to obtain the first signal E in the range time domain-Doppler domain A ; then to E A Perform range-to-Fourier transform processing to obtain the second signal E in the range frequency domain-Doppler domain B ;

[0048]In the present invention, the azimuth Fourier transform adopts the azimuth Fourier transform described in "Synthetic Aperture Radar Imaging-Algorithm and Realization" published by Electronic Industry ...

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Abstract

The invention discloses a stretching nonlinear scaling method for imaging processing of a forward squint-looking sub-aperture of synthetic aperture radar, which belongs to the technical field of the imaging of the synthetic aperture radar. The method comprises the steps of: carrying out range distance processing on sub-aperture echo data acquired by the synthetic aperture radar under the forward squint-looking condition by adopting a nonlinear scaling method; describing the phase characteristic of an echo signal in a range-doppler domain by adopting a third-order model and compensating the change of the range distance modulating frequency so as to realize range distance focusing; and then carrying out azimuth processing by adopting a frequency spectrum analysis method to realize imaging of the forward squint-looking sub-aperture of the synthetic aperture radar. The method has good imaging consistency and reduces calculated quantity of imaging processing.

Description

technical field [0001] The present invention relates to an imaging processing method of synthetic aperture radar, more particularly, refers to an extended nonlinear scaling method for synthetic aperture radar front squint sub-aperture imaging processing. Background technique [0002] "Radar Imaging Technology", published by Harbin Institute of Technology Press and edited by Liu Yongtan in October 1999, pointed out that the synthetic aperture radar is installed on a moving platform, transmits and receives pulses according to a certain repetition frequency, and will receive target echoes within a period of time. The signals are coherently superimposed to obtain the detection effect of the large-aperture antenna array and achieve high azimuth resolution. At the same time, pulse compression technology is used to achieve high range resolution. [0003] "Signal Analysis and Imaging Research of Missile-borne Side-looking Synthetic Aperture Radar" published by Yu Genmiao et al. in t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/89G01S7/295
Inventor 于泽张岩李洲李春升
Owner BEIHANG UNIV
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