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Broadband Doppler velocity log (DVL) measures velocity relative to sea bottom according to Doppler effects and has been used in the navigation of multiple carriers. It improves the measurement accuracy compared to narrowband technique by phase coded technique and pulse-pulse correlation technique. To study the characteristics of the echo and increase accuracy further, echo model is established, the...
Broadband acoustics Doppler current profiler (BBADCP) uses the repeated phase-coded signal. It has higher range and velocity resolution, compared with narrow band acoustics Doppler current profiler (NBADCP). The character of BBADCP echo is different in different ocean environment. It is necessary to establish corresponding model for analyzing the effects of different echo on measurement precision...
Broad band acoustic Doppler current profiler (BBADCP) adopt repeated binary coded pulse as itpsilas transmitted signal. According to the characteristic of signal spectrum, this kind of signal can be represented as the linear addition of multiple narrow band signals with different frequency. Using the Cramer-Rao bound of narrow band acoustic Doppler current profiler (NBADCP), the accuracy model of...
A solution is put forward to hardware-in-loop simulation test system (HSTS) on land for phased-array doppler sonar (PADS), including HSTSpsila composition, principle and the structure of acoustic coupling device (ACD). The mathematics model of ACD is deduced. Acoustics pressure distribution is calculated and simulated in near field of ACDpsilas transducer array. The principle and method, being used...
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