基于参数搜索的水声定位时标跳变改正方法OA北大核心CSTPCD

Acoustic positioning technology can transfer the position reference frame maintained by GNSS into the ocean.Domestic GNSS-acoustic seabed positioning experiments typically involve the cooperation of multiple hardware devices.However,the observation data outputted by different de-vices may suffer from time stamp jumps.While time stamp jumps can be resolved through redundant observations,there is currently no effective solution for cases without redundant observations.There-fore,we propose a time stamp jump correction method based on parameter search.By constructing a search space for time stamp deviations and using the unit weight variance of acoustic positioning results as a criterion,the time stamp jump in observation data is searched numerically.The proposed method is validated using measured sea trial data.The results show that the parameter search method successfully detects a time stamp jump of approximately 1 second in acoustic device data and improves the accuracy of acoustic positioning from decimeter-level to millimeter-level by correcting the data time stamps.