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High-resolution P waveband SAR space-variant kinematic error compensation algorithm based on BP algorithm

A high-resolution, motion error technology, applied in radio wave measurement systems, radio wave reflection/re-radiation, and re-radiation, can solve problems such as limiting the application of BP algorithm, avoid two-dimensional coupling and save time , the effect of reducing the amount of computation

Active Publication Date: 2015-03-18
济钢防务技术有限公司
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Problems solved by technology

Compared with the frequency domain processing algorithm, although the BP algorithm can adapt to large motion errors, it requires hundreds of times the amount of calculation, which is unbearable in practical applications, which greatly limits the application of the BP algorithm

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  • High-resolution P waveband SAR space-variant kinematic error compensation algorithm based on BP algorithm
  • High-resolution P waveband SAR space-variant kinematic error compensation algorithm based on BP algorithm
  • High-resolution P waveband SAR space-variant kinematic error compensation algorithm based on BP algorithm

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Embodiment Construction

[0022] In order to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] The present invention proposes a high-resolution P-band SAR space-varying motion error compensation algorithm based on the BP algorithm—phase disturbance BP space-varying error compensation algorithm. Compared with the existing azimuth space-varying error compensation algorithm, the new method can compensate The distance migration correction error caused by the azimuth space-variation error can adapt to the larger azimuth space-variation error. like figure 1 , the method is specifically:

[0024] Step 1, the received SAR original echo data is processed by the ω-κ algorithm combined with motion compensation to obtain the two-dimensional frequency domain data of the SAR image;

[0025] Specifically, the original SAR echo data is subjected to range co...

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Abstract

The invention discloses a high-resolution P waveband SAR (Synthetic Aperture Radar) space-variant kinematic error compensation algorithm based on a BP (Backpropagation) algorithm. According to the compensation algorithm, azimuth space-invariant error compensation is conducted by a conventional method, and then residual space-variant kinematic error compensation is conducted according to the BP algorithm. During the residual space-variant kinematic error compensation, a secondary phase perturbation technique is utilized, so that the operation quantity is reduced, and the time is saved; in addition, two-dimensional coupling of SAR data is avoided during independent compensation on a single target in a two-dimensional time domain due to the advantages of the BP algorithm; distance migration error correction can be conducted; and therefore, the compensation algorithm can adapt to a greater airborne kinematic error, and has higher compensation accuracy.

Description

technical field [0001] The invention relates to a high-resolution P-band SAR space-varying motion error compensation algorithm based on a BP algorithm, and relates to the fields of airborne SAR imaging processing and motion compensation. Background technique [0002] Airborne Synthetic Aperture Radar (SAR) needs to use imaging processing algorithm to perform matching filter processing on SAR raw echo data to obtain SAR images. Since time-domain processing algorithms are very time-consuming, frequency-domain processing algorithms (such as WK algorithm, Chirp Scaling algorithm, and range-Doppler algorithm) are generally used for imaging processing. However, the frequency domain processing algorithm can only adapt to the situation where the carrier aircraft is moving in an ideal horizontal and uniform linear motion, and the non-ideal motion of the carrier aircraft needs to be compensated by the motion compensation algorithm. Due to the two-dimensional coupling of SAR signals, ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/02G01S13/90
Inventor 孟大地林雪胡玉新丁赤飚
Owner 济钢防务技术有限公司
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