Research on UWB SAR Image Formation with Suppressing Multipath Ghosts

Conventional SAR image formation algorithms can not remove the interference from multipath spreading events, so SAR images appear as ghosts. In this paper a multipath scattering model fit for stripmap SAR has been founded. By analyzing the model, we have obtained three characters of multipath ghosts, which are aspect dependence, lower resolution and non-ideal focusing. For low frequency band and large beamwidth SAR, the aspect dependence of ghosts is more remarkable. We hereby propose an ultra-wide band (UWB) SAR image formation algorithm with suppressing multipath ghosts. Simulations show that this algorithm may improve the peak value ratio between real and false targets about 13-18 dB