多角度SAR成像模式设计及验证

Design and experiment of multi-aspect SAR imaging mode

多角度SAR成像从不同角度获取目标的后向散射特性,通过非相干合成,探测到丰富的目标细节信息、目标变化信息甚至三维信息,可有效解决传统正侧视SAR成像中存在的目标遮挡问题,具有广阔的应用空间.基于某具有方位向大扫描能力的X波段机载SAR试验系统,设计了一种高分辨率多角度SAR成像模式;对方位波束转角、脉冲重复频率、脉冲驻留数、作用距离及灵敏度等技术指标进行了论证分析;最后通过机载飞行试验验证了该设计方案的有效性,为机载多角度SAR成像模式的设计和实现提供了参考和依据.

The backscattering characteristics of targets are acquired from different angles in multi-aspect SAR imaging.Through non-coherent synthesis,rich target detail information,target change information and even 3D information are detected,which can effectively solve the problem of target occlusion in traditional frontal side-view SAR imaging and has a wide application space.This paper is based on a certain X-band airborne SAR testing system with azimuthal large scanning capability to design a high resolution multi-aspect SAR imaging mode.And then the paper makes a demonstration and analysis on the azimuth beam angle,pulse repetition frequency,pulse dwell number,range coverage,sensitivity and other technical indexes.Finally,the effectiveness of the design scheme is verified through airborne experiment,thus providing a reference and basis for the design and implementation of airborne multi-aspect SAR imaging mode.