Moving and state double-base synthetic aperture radar imaging method

A technology of synthetic aperture radar and imaging method, which is applied in the directions of reflection/re-radiation of radio waves, utilization of re-radiation, measurement devices, etc., and can solve the problems of low calculation efficiency of spatial variation characteristics of large scenes and so on.

Inactive Publication Date: 2009-08-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0014] The purpose of the present invention is to propose a dynamic-static bistatic synthetic aperture radar imaging method in order to solve the probl

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  • Moving and state double-base synthetic aperture radar imaging method
  • Moving and state double-base synthetic aperture radar imaging method
  • Moving and state double-base synthetic aperture radar imaging method

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[0046] In order to make the objectives, technical solutions and advantages of the present invention clearer, the method of the present invention will now be described in further detail with reference to the accompanying drawings.

[0047] A moving-static bistatic synthetic aperture radar imaging method includes the following steps:

[0048] The dynamic SAR transmitter sends a radar signal to the detection target, and the stationary receiver receives the radar signal reflected by the detection target. In the stationary receiver, the following processing is performed:

[0049] (1) Process the radar signal reflected by the detection target (referred to as the target) to obtain radar echo data.

[0050] The point target echo on the whole scene Ω is superimposed, that is, the single point echo signal (1) is integrated on the whole scene Ω, and the radar echo data S(t, t n ),Expressed as:

[0051] s ( t , t ...

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Abstract

The invention discloses a method for synthesizing aperture radar images by one dynamic base and one static base and belongs to the technical field of radar signal processing. Firstly, radar signals which are reflected back by a detecting object are processed to obtain radar echo data. Then two-dimensional Fourier transformation is carried out to the radar echo data, thus obtaining two-dimensional frequency domain data, and distance frequency domain matching filtering processing is carried out. Then Taylor expansion is carried out to the phase of the obtained two-dimensional frequency domain data after filtering processing; and then the phase is compensated; at last, the spatial-variant properties of the phase after compensation is analyzed. According to the analysis result of the spatial-variant properties, mapping of beam domain and non-linear interpolation are carried out to the two-dimensional frequency domain data after phase compensation; and two-dimensional inverse Fourier transformation is carried out to the two-dimensional frequency domain data, thus obtaining the two-dimensional images at last. The method has the advantages of high precision, large adaptation scene and small calculation amount, and the method can overcome large scene spatial-variant properties and is beneficial to real-time imaging.

Description

technical field [0001] The invention relates to a bistatic synthetic aperture radar (BSAR) imaging method, which belongs to the technical field of radar signal processing. Background technique [0002] The rapid development of bistatic synthetic aperture radar (BSAR) technology implies a huge demand for bistatic synthetic aperture radar imaging technology. At present, various monostatic imaging methods have been transplanted into bistatic SAR under certain geometric configurations, such as the typical time-domain imaging (BP) algorithm, and the typical frequency-domain imaging algorithm Range Doppler (RD) Algorithm, Frequency Scaling (CS) Algorithm, Polar Coordinate (PFA) Algorithm, Beam Domain (RMA) Algorithm, etc. At present, research hotspots around the world focus on RD algorithm and RMA algorithm. [0003] The RD algorithm is the most basic algorithm in single-base SAR. It is considered that the distance dimension and the azimuth dimension are decoupled, so it can be ...

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Application Information

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IPC IPC(8): G01S13/90G01S7/285
Inventor 曾涛温亮胡程龙腾
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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