Abstract
Conventional (usually used) Doppler sonar, though unlimited by velocity range ambiguity, takes seconds to return valuable velocity readings. Coherent Doppler sonar has been proposed to provide accurate velocity with short time lag for current or turbulent. However the velocity ambiguity seriously limits its general application. In this paper, combined Doppler sonar is proposed to overcome the disadvantages of both conventional and coherent Doppler sonars. An adaptive algorithm is used for combined Doppler sonar to provide accurate and precise velocity information at a wide range of SNRs. Experiments are carried out to evaluate the performance of combined Doppler sonar proposed. Based on experimental results, with suitable ambiguity velocities, combined Doppler sonar can provide accurate and precise velocity information at a wide range of SNRs.
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