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基于橢圓模型與改進NLCS的一站固定式大基線雙站SAR成像算法

鐘華,  胡劍,  張松,  孫閩紅

鐘華, 胡劍, 張松, 孫閩紅. 基于橢圓模型與改進NLCS的一站固定式大基線雙站SAR成像算法[J]. 電子與信息學報, 2016, 38(12): 3174-3181. doi: 10.11999/JEIT161016
引用本文: 鐘華, 胡劍, 張松, 孫閩紅. 基于橢圓模型與改進NLCS的一站固定式大基線雙站SAR成像算法[J]. 電子與信息學報, 2016, 38(12): 3174-3181. doi: 10.11999/JEIT161016
ZHONG Hua, HU Jian, ZHANG Song, SUN Minhong. Improved NLCS Algorithm Based on Ellipse Model for One-stationary Bistatic SAR with Large Baseline[J]. Journal of Electronics & Information Technology, 2016, 38(12): 3174-3181. doi: 10.11999/JEIT161016
Citation: ZHONG Hua, HU Jian, ZHANG Song, SUN Minhong. Improved NLCS Algorithm Based on Ellipse Model for One-stationary Bistatic SAR with Large Baseline[J]. Journal of Electronics & Information Technology, 2016, 38(12): 3174-3181. doi: 10.11999/JEIT161016

基于橢圓模型與改進NLCS的一站固定式大基線雙站SAR成像算法

doi: 10.11999/JEIT161016 cstr: 32379.14.JEIT161016
基金項目: 

國家自然科學基金(61301248, 61271214)，中國航天科技創(chuàng)新基金

Improved NLCS Algorithm Based on Ellipse Model for One-stationary Bistatic SAR with Large Baseline

Funds: 

The National Natural Science Foundation of China (61301248, 61271214), Chinese Innovation Foundation of Aerospace Science and Technology

  • 摘要: 在一站固定式雙站SAR成像處理中，該文針對距離-方位2維空變描述不夠準確導致成像性能迅速下降的問題，提出一種新的橢圓模型精確描述一站固定式大基線雙站SAR的距離-方位空變特性，并基于此推導了改進的非線性調頻變標(NLCS)成像算法。在距離向，首先利用相位去斜完成距離去走動和多普勒中心矯正，接著對剩余距離單元徙動和距離方位高次耦合項進行了去除處理。在方位向，根據一站固定式雙站SAR的2維空變特性，提出了一種用于描述回波距離-方位空變特性的橢圓模型，基于該模型對空變的回波方位調頻率進行了分析，并重新推導NLCS算法的方位變標函數和方位壓縮系數。理論分析與仿真結果證明，所提出的模型不僅揭示了一站固定式大基線雙站SAR數據的2維空變特性，而且對回波的距離-方位空變給出了更精確的解析式描述，使得基于該模型改進的NLCS算法可以獲得更好的成像處理效果。
    Abstract: In One-Stationary Bistatic Synthetic Aperture Radar (OS-BiSAR) imaging, imprecise description of 2-D range-azimuth space-variant property usually leads to deterioration of final SAR image rapidly. In order to solve this issue, a new ellipse model is proposed to precisely describe range-azimuth space-variant property of OS-BiSAR with large baseline, and an improved Non-Linear Chirp Scaling (NLCS) algorithm is also derived based on this model. First, a phase de-ramp operation is performed to remove the linear Range Cell Migration (RCM) and Doppler centroid in range frequency domain. Then, the residual RCM and high order range-azimuth coupling terms are removed. Thirdly, a new ellipse model is established to describe range-azimuth space-variant property of OS-BiSAR, and then the azimuth frequency modulation rate of space-variant echo is analyzed. Moreover, azimuth scaling function of NLCS and azimuth compression factors are re-derived. Theoretical analysis and simulation results show that the proposed model not only reveals the property of 2-D azimuth-variant in OS-BiSAR, but also provides a precise analytical expression to depict the 2-D range-azimuth space-variant property of OS-BiSAR. Furthermore, simulation results validate that the improved NLCS algorithm based on this new model has high imaging performance.
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出版歷程
  • 收稿日期:  2016-09-30
  • 修回日期:  2016-11-25
  • 刊出日期:  2016-12-19

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