A Multireceiver SAS Imaging Method

It is very hard for the multireceiver synthetic aperture sonar (SAS) to compensate the higher-order phase error. This paper decomposes the multireceiver SAS into many bistatic SASs. Then, two square rooted terms are transformed into a single square rooted term. Based on this transformation, the analytic point of stationary phase and point target reference spectrum (PTRS) can be easily obtained. The phase error is further analyzed in 2-D frequency domain, and the analysis shows that the PTRS can satisfy the need of high-resolution imaging. After that, an imaging algorithm is discussed based on presented PTRS. Finally, some simulations are carried out to verify presented method.