Optimization of phase coded waveform parameters in acoustic Doppler current measurement

In order to solve the problem of weak adaptability of the phase coded acoustic Doppler current measurement using the transmitting signal of fixed parameters, based on the signal ambiguity function and the second derivative of its modulus, two optimization methods are proposed to adjust the parameters of the transmitting signal waveform according to the measurement requirements and environmental conditions. One of the two waveform parameter optimization methods is to obtain the best velocity estimation accuracy under the constraint of layered accuracy and the another one is to achieve the most subdivided layer thickness under the constraint of velocity measurement accuracy. The principle and specific operation steps of waveform parameter optimization are given respectively in this paper. The results of theoretical analysis and experimental data analysis show that compared with the signal of default parameters, the signal obtained by the optimized parameter method has obvious performance advantages, and the optimization degree is basically consistent with the theoretical prediction.