Design and test of 70 kHz correlation velocity log

A 70 kHz prototype correlation velocity log (CVL) has recently been developed. The hardware design and signal processing were discussed. Localized least mean squares (LLMS) was proposed as the criterion of velocity estimation. The CVL underwent a sea trial in the north of the South China Sea in August 2007. The CVL was calibrated in the beginning of the sea trial. Then square loop trackline test, varying speed cruise test and drifting test are carried out to examine the performance of the CVL The uncertainty statistics from the sea trial showed that the rms error of the CVL was less than (1.2%v+3) cm/s.