Implementation of phase calibration and azimuth estimation module for wideband split-beam fishfinder
Wideband split-beam fishfinder is widely used in fisheries resource surveys,and the accuracy of its azimuth estimation determines whether the direction and position of target fish schools can be accurately determined.In order to improve the accuracy and efficiency of azimuth estimation,a phase calibration algorithm based on improved orthogonal digital down-conversion technology was proposed,simulated,and implemented using the Field Programmable Gate Array(FPGA).An azimuth estimation intellectual property(IP)core was built on the Vitis HLS platform to improve the accuracy of azimuth estimation while reducing the floating-point computation delay;finally,testing was conducted using a signal generator.The results showed that the azimuth estimation error of the module was no more than 0.05°,the total computation delay did not exceed 420 ns,and the logical resource consumption was less than 45%,consistent with the system specifications.This research achievement has been successfully applied in the broadband split-beam fishfinder,significantly enhancing system accuracy and performance and generating certain economic benefits.
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