Optimizing baseline in USBL using Costas hopping to increase navigation precision in shallow water

This paper proposes a solution to design an active sonar navigator using an ultra-short baseline (USBL) system with an array of four hydrophones and costas signals. To evaluate the accuracy of the USBL system in long-range target detection, our research team use the time-delay estimation algorithm at the correlation peak of the USBL system. The signals are processed on XILINX FPGA kit-board. Through Monte Carlo statistical method, the simulation results show that our proposed model has been able to increase the navigation accuracy and find the optimal baseline for the 28-36kHz frequency range of the USBL system.