High-precision synthetic aperture radar imaging method
A technology of synthetic aperture radar and imaging method, which is applied in the direction of radio wave reflection/re-radiation, utilization of re-radiation, measurement devices, etc., and can solve problems such as large amount of calculation, need, and increased processing steps
Active Publication Date: 2014-12-24
INST OF ELECTRONICS CHINESE ACAD OF SCI
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The CS method avoids the interpolation operation, but it brings more processing steps and requires multiple transposition storage, which increases the complexity of the processing
[0005] In the existing SAR imaging methods, there are problems such as low precision, complex calculation processing, and large amount of calculation.
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[0039] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0040] Such as figure 1 as shown, figure 1 It is a flow chart of a method for high-precision SAR imaging implemented according to the present invention, the method comprising the following steps:
[0041] Step S1: Down-convert and demodulate the echo signal received by the SAR in sequence, then perform range-to-Fourier transform, multiply the transform result by the range pulse compression reference function, and obtain the signal S r1 (t,f r );
[0042] Suppose the chirp signal transmitted by the radar is
[0043] p(τ)=a(τ)exp[j(2πf 0 +K r πτ 2 ] (1)
[0044] where τ represents the distance time variable of the transmitted signal, a(·) represents the transmitted signal envelope, f 0 is the carrier frequency of...
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The invention discloses a high-precision synthetic aperture radar imaging method. The high-precision synthetic aperture radar imaging method includes the steps that down-conversion, demodulation and range Fourier transform are sequentially performed on echo signals received by a synthetic aperture radar, the transform result is multiplied by a range pulse compression reference function, and then a signal S<r1>(t,f<r>) is obtained; the signal S<r1>(t,f<r>) is multiplied by an interpolation error precompensation function given by an interpolation algorithm, inverse Fourier transform is performed after range frequency spectrum zero-padding, and then a signal s<r>(t,r) subjected to range compression and interpolation error precompensation is obtained; azimuth Fourier transform is performed on the s<r>(t,r), range migration correction is performed according to the set interpolation algorithm, and a range Doppler signal S<t1>(f<t>,r) is obtained; the range Doppler signal S<t1>(f<t>,r) is multiplied by an azimuth pulse compression reference function, then azimuth inverse Fourier transform is performed, and then a high-precision synthetic aperture radar image is obtained. According to the high-precision synthetic aperture radar imaging method, targeted compensation is made for the error, and the high-precision synthetic aperture radar imaging method is high in imaging precision, simple in calculation, small in operation amount, short in occupied transposition processing time and small in occupied storage space, and the processing procedure is simplified.
Description
technical field [0001] The invention relates to the technical field of synthetic aperture radar (SAR), in particular to a high-precision synthetic aperture radar imaging method. Background technique [0002] Synthetic Aperture Radar (SAR) is a microwave imaging remote sensing device that works in active detection mode. SAR is loaded on moving platforms such as aircrafts and satellites. As the platform moves, it transmits detection signals and receives target echo signals. By comprehensively processing a series of received signals, it is equivalent to a large-aperture antenna for transmission and reception. High-resolution target detection is realized by means of the received signal, and this technology is called aperture synthesis technology. Synthetic aperture radar obtains high resolution in the range direction by using pulse compression technology, and obtains high resolution in azimuth direction by using aperture synthesis technology. It has long detection distance, wi...
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IPC IPC(8): G01S13/90
CPCG01S13/90G01S13/9011
Inventor 王岩飞徐向辉韩松刘畅李和平
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI