Processing Multireceiver SAS Data Based on the PTRS Linearization

Range migration algorithm (RMA) requires that the point target reference spectrum (PTRS) linearly varies with range. According to this characteristic of RMA, this paper presents an imaging algorithm for the multireceiver synthetic aperture sonar (SAS) based on the linearization of PTRS with respect to range. With the zero-th order term and linear term, the bulk focusing and differential focusing are exploited to process each receiver data. Accordingly, the coarse resolution result corresponding to a single receiver data is obtained. After superposing all coarse resolution results, the high performance image is obtained. At last, the simulations are used to validate the presented method.