Abstract
A maximum-likelihood estimator is used to extract differential phase measurements from noisy seafloor echoes received at pairs of transducers mounted on either side of the SeaMARC II bathymetricsidescan sonar system. Carrier frequencies for each side are about 1 kHz apart, and echoes from a transmitted pulse 2 ms long are analyzed. For each side, phase difference sequences are derived from the full complex data consisting of base-banded and digitized quadrature components of the received echoes. With less bias and a lower variance, this method is shown to be more efficient than a uniform mean estimator. It also does not exhibit the angular or time ambiguities commonly found in the histogram method used in the SeaMARC II system. A figure for the estimation uncertainty of the phasedifference is presented, and results are obtained for both real and simulated data. Based on this error estimate and an empirical verification derived through coherent ping stacking, a single filter length of 100 ms is chosen for data processing applications
Department
Center for Coastal and Ocean Mapping
Publication Date
7-1992
Volume
17, Issue 3
Journal Title
IEEE Journal of Oceanic Engineering
Pages
239-251
Publisher Place
Washington DC, USA
Publisher
IEEE
Digital Object Identifier (DOI)
10.1109/48.153441
Document Type
Journal Article
Recommended Citation
Masnadi-Shirazi, M.A.; de Moustier, C.; Cervenka, P.; Zisk, S.H., "Differential phase estimation with the SeaMARCII bathymetric sidescan sonar system," in Oceanic Engineering, IEEE Journal of , vol.17, no.3, pp.239-251, Jul 1992 doi: 10.1109/48.153441