Design and Implementation of Preprocessing Unit of FPGA-based Ultra-short Baseline Positioning System

摘要

The underwater acoustic positioning system is the mainstream of current underwater navigation positioning. Ultra-short baseline underwater acoustic positioning is one of its main methods. It has the characteristics of high accuracy, small baseline size, and convenient use. This paper designs a preprocessing system for ultra-short baseline positioning, which realizes the acquisition and A/D conversion of real-time analog signals, and performs digital filtering and sliding related processing on the FPGA platform. This article takes the SOPC system as the core, buffers the real-time signals of multiple channels, and uses the overlap preservation method to perform sliding-related segmentation processing on the buffered signals, including FFT transform, signal mixing, and IFFT transform. The results are proofread and sent into the DSP. This system implements the algorithm part through FPGA, which greatly reduces the burden on the DSP and allows the DSP more time to process other parts.