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For the imaging of multiple-receiver synthetic aperture sonar (SAS) under the nonstop-hop-stop case, an exact analytical solution for the two-dimensional (2-D) frequency spectrum is usually difficult to obtain because of the existence of the double-square-root (DSR) term in the range history equation. Several approximate solutions for the 2-D spectrum have been derived to focus the multiple-receiver...
In this paper a kind of phase unwrapping-free digital elevation model(DEM) reconstruction method of interferometric synthetic aperture sonar(InSAS) is described. Firstly, a new method of coarse DEM generation is proposed. In the method, a pair of images are divided into small blocks and resampled to a set of reference planes. The height of each block pair is estimated by measuring the maximum coherence...
The towfish motion error is analyzed in this paper first. It is shown that the motion error is range-variant in wide-swath SAS application. Displaced phase center algorithm (DPCA) used in synthetic aperture sonar (SAS) to estimate and compensate motion error is only suitable for compensation of range-invariant motion error, but the performance could be degraded in the case of range-variant motion...
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