摘要
斜视TOPS SAR成像处理需要解决3大问题:方位频谱混叠,距离和方位耦合严重,方位输出时域混叠。针对上述问题,该文提出一种基于谱分析的子孔径成像处理方法。首先对子孔径数据在时域适当进行扩展并获取无模糊的2维频谱,然后采用修正的距离徙动算法进行距离徙动校正和距离脉冲压缩,最后在方位频域对子孔径信号进行拼接处理,获得全孔径信号无模糊的方位频谱并结合谱分析技术将信号聚焦在方位频域。仿真结果验证了该算法的有效性。
Squint Terrain Observation by Progressive Scans （TOPS） SAR imaging mode is confronted with three issues： azimuth spectrum aliasing, severe range-azimuth coupling and azimuth time output aliasing. To solve these issues, a subaperture imaging algorithm is proposed based on the SPECtral ANalysis （SPECAN） technique. Firstly the subaperture data is expanded in the azimuth time domain and the two-dimensional spectrum free from aliasing can be obtained. Then the modified Range Migration Algorithm （RMA） is used to complete Range Cell Migration Correction （RCMC） and range compression. After that, the full-aperture azimuth spectrum can be derived by subaperture recombination. Finally, the signal is focused in the Doppler domain by the SPECAN technique. Simulation results demonstrate the effectiveness of the proposed method.
出处
《电子与信息学报》
EI
CSCD
北大核心
2014年第4期923-931,共9页
Journal of Electronics & Information Technology
基金
国家自然科学基金(61222108
61301292)资助课题
关键词
合成孔径雷达
斜视TOPS
SAR
子孔径处理
修正的距离徙动算法
谱分析
SAR
Squint Terrain Observation by Progressive Scans （TOPS） SAR
Subaperture processing
Modified Range Migration Algorithm （RMA）
Spectral analysis
