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Beaming SAR imaging method based on improved PFA and DSP implementation thereof

An imaging method and azimuth technology, applied in the reflection/re-radiation of radio waves, instruments, measuring devices, etc., can solve the problems of image geometric distortion, large amount of calculation, defocusing, etc., and achieve low power consumption, good performance, The effect of high reliability

Active Publication Date: 2020-10-30
XIDIAN UNIV
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Problems solved by technology

[0004] For the problems existing in the prior art, the purpose of the present invention is to provide a spotlight SAR imaging method based on improved PFA and its DSP implementation, the imaging method can solve the large amount of calculation brought by the traditional two-dimensional interpolation and the classic PFA algorithm Assuming that the wavefront is a plane, the geometric distortion and defocus of the image are caused; and the DSP implementation of this method uses a high-performance multi-core DSP-TMS320C6678 hardware platform to realize real-time imaging of spotlight SAR

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  • Beaming SAR imaging method based on improved PFA and DSP implementation thereof
  • Beaming SAR imaging method based on improved PFA and DSP implementation thereof
  • Beaming SAR imaging method based on improved PFA and DSP implementation thereof

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Embodiment Construction

[0029] Embodiments of the present invention will be described in detail below in conjunction with examples, but those skilled in the art will understand that the following examples are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention.

[0030] refer to figure 1 , a kind of spotlight SAR imaging method and its DSP realization based on improved PFA provided by the present invention, comprise the following steps:

[0031] Step 1, the SAR receives the echo data, and performs motion error compensation on the echo data to obtain the echo data after motion error compensation;

[0032] SAR receives and stores echo data, and the present invention is implemented on the DSP-TMS320C6678 platform, specifically: the front-end high-speed AD acquisition module completes data acquisition, and sends it through SRIO (Serial Rapid IO, high-speed serial interface) via FPGA according to a certain repetition frequency For DSP...

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Abstract

The invention discloses a bunching SAR imaging method based on an improved PFA and DSP implementation thereof. The imaging method comprises the following steps that a radar receives echo data and carries out motion error compensation; azimuth resampling is carried out; distance direction phase compensation; estimating and compensating azimuth frequency modulation rate, and compressing azimuth pulse; distance direction geometric correction; and performing self-focusing and image multi-view quantization. The imaging process is realized on a DSP-TMS320C6678 hardware platform, and eight cores cooperate to complete the whole imaging processing process. According to the method, the problems of large calculation amount caused by traditional two-dimensional interpolation and image geometric distortion and defocusing caused by assuming that the wavefront is a plane by a classic PFA algorithm can be solved; and the DSP of the method is realized by adopting a high-performance multi-core DSP-TMS320C6678 hardware platform, so that the real-time imaging of the bunching SAR is realized.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, in particular to a spotlight SAR imaging method based on improved PFA and its DSP implementation, which is suitable for real-time imaging of airborne radar. Background technique [0002] Synthetic Aperture Radar (SAR) imaging technology can achieve two-dimensional high-resolution imaging of the observation scene, which greatly improves the information acquisition and perception capabilities of radar, and shows excellent application value and Broad application prospects. Spotlight SAR is an important working mode of radar real-time imaging. By controlling the beam pointing of the antenna, it can illuminate the imaging area for a long time and obtain a longer synthetic aperture time, thereby improving the azimuth resolution of SAR imaging. Polar coordinate format Algorithm (Polar Format Algorithm, PFA for short) is a classic algorithm of spotlight SAR mode. This algorithm uses pola...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41
CPCG01S13/9021G01S13/9052G01S13/9094G01S7/418G01S7/415G01S7/414
Inventor 王虹现高壮壮张艺坤谭高伟
Owner XIDIAN UNIV
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