A Study of Characteristics and Processing Method of Broadband Doppler Velocity Log Echo

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 envelope and auto-correlation of echo are analyzed, and the results show that processing the echo illuminated by the whole beam will obtain higher accuracy in high signal to noise ratio. The data of lake experiment are analyzed, and the results prove the conclusion. At last, digital simulation is done, the simulating results are in agreement with the conclusion and processing methods in different SNR are supposed.