Orthogonal coprime SAR

In this paper we present a new technique able to reduce the amount of data to be stored and processed in order to obtain large swath SAR image in marine scenarios. The proposed technique is an enhancement of the recently proposed CopSAR technique and it is based on the transmission of (quasi) orthogonal waveforms, i.e. up- and down-chirps. The proposed implementation is able to achieve both data reduction and range swath extension with no appearance of ghosts, no resolution loss, and with only a limited complication of the required technology. The only costs are the reduction of the target-to-background ratio and the presence of a (non-stringent) limit on maximum ship size.