摘要
对异址多站雷达回波相干融合可以将空间观测视角的分离转换为目标积累时间的增加,提高ISAR像方位分辨率。该文针对在轨空间目标多站ISAR相干融合成像问题,提出一种基于目标轨道先验信息的优化布站方法,提高了回波融合效率;针对多站雷达回波融合处理问题,利用轨道运动模型分析了融合成像平面的空变特性,提出融合回波越距离单元徙动、多普勒时变等问题的解决方法,使多视角回波有效相干融合。利用空间站轨道验证了融合成像平面的空变性,从徙动校正效果及分辨率改善等方面验证了布站及融合算法的有效性。
The spatially separated observation angles from the multiple inverse synthetic aperture radar sensors can be converted to the accumulation time of the same target, which can improve the cross-range resolution of ISAR image by the coherent fusion of raw echo signals collected from different sensors. To solve the issue of multiple radar sensors coherent fusion ISAR imaging of space target moving on orbit, the radar location optimal method based on the orbital prior of the space target is proposed to improve the efficiency of the echoes fusion, the spatialvariant property of the fusion imaging plane of space target is analyzed using orbital motion model to solve the range Migration Through Resolution Cells （MTRC） and time-varying Doppler. The simulation results based on real orbit of space station confirm the effectiveness of the proposed method.
出处
《电子与信息学报》
EI
CSCD
北大核心
2017年第12期2834-2843,共10页
Journal of Electronics & Information Technology
基金
国家自然科学基金(61401024)~~
关键词
ISAR成像
空间目标
相干融合
空变特性
ISAR imaging
Space target
Coherent fusion
Spatial-variant property
