A Synthetic Aperture Radar pfa Imaging Algorithm Based on Compressive Sensing
A technology of synthetic aperture radar and compressed sensing, applied in the direction of radio wave reflection/re-radiation, using re-radiation, measuring devices, etc., can solve the problems of not considering distance migration and affecting resolution, etc., to ensure two-dimensional resolution , Guaranteed accuracy and cost-saving effects
Inactive Publication Date: 2017-01-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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[0009] The algorithms disclosed in Document 2 to Document 6 do not consider the influence of distance migration, and are all based on the premise that the two-dimensional data can be separated. Compressed sensing recovery imaging
Since these algorithms do not consider the impact of range migration, the resolution in the range and azimuth directions is seriously affected
[0010] So far, the impact of range migration in compressed sensing imaging algorithms and the correction of range migration using compressed sensing have not been reported in the prior art, and there is no research on this aspect in this field
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[0039] Below in conjunction with accompanying drawing, a kind of synthetic aperture radar PFA imaging algorithm based on compressed sensing that the present invention proposes is described in detail:
[0040] Such as figure 1 As shown, first, the radar transmitter transmits the chirp signal according to the preset pulse repetition frequency, that is, transmits the pulse according to the normal PRI; secondly, the radar receiver randomizes the reflected echo pulse data according to the down-sampled pulse number Then, match filtering and motion compensation are performed on each received pulse data, and the range interpolation is performed sequentially. After the range interpolation is completed, the echo signal is compressed in azimuth by using the base matrix that changes with the range frequency Perceptual recovery processing, the sparse recovery is performed on the azimuth, and finally, the inverse Fourier transform imaging is performed on the range, that is, IFFT imaging.
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The invention discloses a compressive-sensing-based synthetic aperture radar PFA imaging algorithm. The algorithm includes that a radar transmitter transmits linear frequency-modulated signals according to preset pulse repeating frequency; a radar receiver randomly receives and stores echo pulse data which are reflected back according to to-be-sampled pulse number; each of the received pulse data is subjected to matched filtering and motion compensation and sequentially subjected to range interpolation, and a basis matrix is adopted to perform sparse recovery on azimuth after range interpolation is completed; inverse Fourier transformation imaging is performed on range. By the algorithm, influence of range migration is eliminated, and two-dimensional resolution ratio of images and accuracy in subsequent signal processing are guaranteed; the objective of reducing echo data storage and transmission pressure is achieved without modifying existing radar equipment, good focusing effect on SAR images is realized, the algorithm is suitable for reality application, and cost is saved.
Description
technical field [0001] The invention belongs to the technical field of radar imaging, and in particular relates to a synthetic aperture radar PFA imaging algorithm based on compressed sensing. Background technique [0002] Compared with optical and infrared remote sensing imaging, synthetic aperture radar (SAR) has all-weather and all-weather advantages. People's awareness of synthetic aperture radar is becoming more and more abundant, and its role in remote sensing and telemetry is becoming more and more important. bigger. With the continuous advancement of synthetic aperture radar technology, people hope to interpret and recognize SAR images more carefully, and put forward higher resolution requirements for SAR images. As we all know, the way to improve the range resolution of SAR images is to increase the bandwidth of the transmitted signal, while the resolution in azimuth depends on the length of the synthetic aperture. The PFA algorithm is a high-precision imaging alg...
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IPC IPC(8): G01S7/28G01S7/32
CPCG01S13/90G01S13/9011
Inventor 朱岱寅段化军缪霖灏周欣荆腾
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS