Multistage back-projection synthetic aperture radar imaging method based on geometric correction
A technology of synthetic aperture radar and geometric correction, which is applied in the directions of radio wave reflection/re-radiation, utilization of re-radiation, measurement devices, etc., and can solve problems such as large amount of calculation, low calculation efficiency, and low efficiency
Inactive Publication Date: 2014-10-01
XIDIAN UNIV
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However, the fast graded post-projection algorithm FFBPA still requires two-dimensional point-by-point interpolation, which requires a large amount of calculation and low calculation efficiency in practical applications.
[0006] Among the above algorithms, BPA, FBPA, and FFBPA have a relatively large amount of calculation in practical applications, and the efficiency is not high.
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[0044] refer to figure 1 , illustrating a geometric correction-based multi-level post-projection synthetic aperture radar imaging method proposed by the present invention, its specific steps are as follows:
[0045] Step 1: The synthetic aperture radar receives the original echo signal of the target, and performs demodulation and sampling processing on the received echo signal.
[0046] Step 2, performing range pulse compression processing on the demodulated and sampled signal to obtain a range pulse compressed signal.
[0047] Step 3, carry out azimuth block operation on the signal after the range pulse pressure, divide the signal after the range pulse pressure into N sub-aperture signals and divide the radar full aperture into N sub-apertures; take the center of each sub-aperture as the origin, and establish each sub-aperture The polar coordinate system of the aperture is the local polar coordinate system; each sub-aperture signal is back-projected in the local polar coordi...
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The invention discloses a multistage back-projection synthetic aperture radar imaging method based on geometric correction and relates to the field of radar signal processing. The method includes the steps that firstly, synthetic aperture radar modulates and samples received echo signals; secondly, signals generated after distance pulse pressure are obtained; thirdly, each sub-aperture signal in a local polar coordinate system is imaged; fourthly, pairwise grouping is conducted on two adjacent sub-images of sub-images of the jth level; fifthly, translation is conducted on each row of angle dimension elements and each column of distance dimension elements of each sub-image; sixthly, sampling and phase correction are conducted on the angle dimension; seventhly, a previous sub-image generated after phase correction and a next sub-image generated after phase correction in each set are superimposed, and the (j+1)th level of sub-images is obtained; eighthly, the Nsth level of sub-images (see in the specifications) is obtained. According to the multistage back-projection synthetic aperture radar imaging method based on geometric correction, the calculated amount is small, efficiency is higher, the imaging efficiency and the imaging quality can be taken into consideration, and the multistage back-projection synthetic aperture radar imaging method is used for bunching mode synthetic aperture radar imaging and is suitable for onboard and satellite-borne platforms.
Description
technical field [0001] The invention belongs to the field of radar signal processing, and relates to a geometric correction-based multi-stage post-projection synthetic aperture radar imaging method, which is used for spotlight mode synthetic aperture radar imaging and is suitable for airborne and spaceborne platforms. Background technique [0002] Synthetic aperture radar imaging belongs to high-resolution imaging technology. In the distance direction, it obtains high resolution by transmitting large-bandwidth signals; by moving the real aperture antenna, synthetic aperture radar can illuminate the scene in a wide range of viewing angles, thereby greatly improving the azimuth. resolution. [0003] The Back Projection Algorithm (BPA) is introduced from the field of computer tomography. Based on the essential working principle of Synthetic Aperture Radar (SAR), the algorithm back-projects the data after range pulse pressure to each imaging point, and then obtains a precisely ...
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Login to View More IPC IPC(8): G01S13/90G01S7/40
CPCG01S7/40G01S13/904G01S13/9047G01S13/9017
Inventor 孙光才杨泽民左绍山邢孟道保铮
Owner XIDIAN UNIV