Multi-angle fusion of SS-BiSAR images using Compass-2/Beidou-2 Satellites as opportunity illuminators

In BiSAR (Bistatic SAR), scattering characteristic of target varies with the geometric configuration of transmitter and receiver. Single angle SAR image can only provide limited information of a target, which hinders the recognition of targets and limits the application of BiSAR images. To overcome this shortage, a multi-angle fusion method is proposed. Sixteen SS-BiSAR (Space-Surface BiSAR) images using Compass-2/Beidou-2 as opportunity illuminator in different azimuth and elevation angles are obtained via Back-Projection algorithm. Then a fusion image is gained through non-coherent superposition. The result of fusion image shows that: multi-angle fusion is able to capture specular reflection of targets. Structure characteristics of targets are observed in fusion image while in single angle image only a part of target structure is visible. By multi-angle fusion, a continuous outline of target is achieved, which is very advantageous to interpretation of BiSAR images.