Ultrashort Baseline Underwater Acoustic Positioning System Based on Timestamp

The existing conventional ultra-short baseline system uses half of the propagation time delay as the processing parameter for positioning solution, but the hydroacoustic transponder will move a certain distance when interconnecting with the underwater operation device and the hull where the ultra-short baseline base array is located, which will have some influence on the positioning of the ultra-short baseline system. In order to reduce the positioning error of the ultrashort baseline system, this paper adopts broadband spread spectrum signals and modulated signals carrying time stamps for hydroacoustic positioning, and adopts the method of obtaining time stamp information and combining with atomic clock chips to obtain time information when receiving and transmitting acoustic signals to estimate the slant distance between the underwater operating unit and the water platform and estimate the one-sided propagation time delay, so that the water platform can obtain more accurate data, which has been It is proved that this method can reduce the hydroacoustic positioning error.