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Sub-aperture partition PFA (Polar Format Algorithm) radar imaging method

A sub-aperture and aperture technology, applied in the field of dividing sub-aperture PFA radar imaging and synthetic aperture radar imaging processing algorithm, can solve the problems of increasing resource consumption and processing time, geometric fidelity of imaging results and effective scene size limitation, etc.

Active Publication Date: 2015-03-04
南京六季光电技术研究院有限公司
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Problems solved by technology

However, the classic PFA processing is to process the full-aperture full-block data. There is a wavefront bending approximation, and the geometric fidelity of the imaging result and the effective scene size are limited. In addition, the processing of the full-aperture full-block data increases Resource consumption and processing time

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Embodiment Construction

[0068] All the steps and conclusions of the present invention are verified on the IDL with actual measurement data, and the present invention will be further explained below in conjunction with the accompanying drawings.

[0069] In this embodiment, the SAR measured data is used to verify and analyze the sub-aperture PFA radar imaging method. The measured data is the echo obtained by a certain type of airborne X-band pulse radar for ground beam detection. The radar bandwidth is 1.16GHz, the carrier frequency is 10GHz, the frequency modulation slope is 78956GHz / s, the pulse sampling frequency is 1.5GHz, and the pulse repetition rate is 1.16GHz. The frequency PRF is 2200Hz, the speed of the carrier aircraft is 154m / s, and the altitude of the carrier aircraft is 5700m. The azimuth aperture size Na of the SAR measured data is 16384, the range size is 32768, and the final imaging grid size is 16384×32768.

[0070] The method for dividing the sub-aperture PFA imaging radar includes...

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Abstract

The invention discloses a sub-aperture partition PFA (Polar Format Algorithm) radar imaging method, and belongs to the technical field of radar imaging. All apertures are partitioned into a plurality of sub-apertures; the sub-apertures are processed by using PFA to obtain azimuthal low-resolution images; movement error of the sub-aperture images is eliminated by using PGA (Phase Gradient Autofocus) processing; geometric distortion is eliminated through azimuthal up-sampling, space varying filter and geometric correction; partitioned sub-blocks with overlapped images of all the sub-aperture images obtained by the geometric correction are subjected to image registration; finally all the registered sub-aperture images are fused to obtain a final SAR image. The full-aperture data of a large block is partitioned into sub-aperture data of small blocks for processing, so that the imaging processing efficiency is improved; the partitioned sub-blocks with overlapped images are registered during implementation of the sub-aperture image registration, so that the registration of the entire images can be realized better and seamless splicing of the sub-blocks can also be realized after registration.

Description

technical field [0001] The invention relates to a synthetic aperture radar (synthetic aperture radar, referred to as SAR) imaging processing algorithm, in particular to a sub-aperture PFA radar imaging method, which belongs to the technical field of radar imaging. Background technique [0002] Synthetic Aperture Radar (SAR) is an all-weather and all-weather microwave imaging radar. Its high resolution makes it irreplaceable in military and civilian fields. Imaging algorithm is the core of SAR signal processing to achieve high resolution. Among many SAR imaging algorithms, Polar Format Algorithm (PFA) has the advantages of imaging efficiency, compensation for non-coplanar flight of radar platform, and correction of linear distance walking of moving targets. It has attracted much attention for its excellent performance. However, the classic PFA processing is to process the full-aperture full-block data, and there is a wavefront bending approximation, which limits the geometri...

Claims

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/904G01S13/9019
Inventor 张劲东陈家瑞班阳阳唐笑为
Owner 南京六季光电技术研究院有限公司
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