摘要
基于阵列技术的调频连续波合成孔径雷达(FMCW SAR)以其特有的高分辨成像能力和低能见度透视能力,在飞行平台前视应用中具有较大发展潜力。针对等效双基地的阵列FMCW SAR前视工作模式中,平台运动引入的多普勒频率偏移会导致成像模糊甚至散焦的问题,通过在跨航向处理前引入一个多普勒频率偏移校正因子,改善航线向的多普勒频偏,消除因平台运动带来的跨航向处理困境,最后结合改进CS算法给出了具体的校正方法,点目标仿真验证了校正方法的可行性和有效性。
For the characteristics of high resolution and penetration capability in wicked weather, FMCW SAR based on array signal processing has enormous potential in the looking-forward application on aircraft. Aiming at the problem that Doppler frequency offset due to aircraft motion can result in image deteriorating, a correction factor is introduced before azimuth processing and a correction method combining with extended CS algorithm is proposed for resolving the problem. Simulation validated the feasibility and validity of the proposed method.
出处
《雷达科学与技术》
2012年第3期251-256,共6页
Radar Science and Technology
基金
国家自然科学基金(No.61102167)
关键词
阵列SAR
前视
频率偏移校正
成像处理
array SAR
forward-looking
frequency offset correction
imaging processing
