Ultra-Short Baseline Positioning System for Full Ocean Depth

Ultra-Short Baseline Positioning System for Full Ocean Depth is presented in this paper. A planar array is used to complete the intelligent beam tracking for improving signal-to-noise ratio. Spatial spectrum estimation technology is realized for two-dimensional direction of arrival estimation. And the feedback positioning results can be employed to track the target and achieve ultra-long-distance positioning. Quadri-Phase Shift Keying (QPSK) orthogonal separation code is proposed and designed to resist strong noise interference with spikes. The sea trial results show that the maximum detection distance is 15133m and the real-time positioning accuracy is higher than 0.3% of the slant range.