Implementation of FPGA-based adaptive notch filter

According to the signal characteristics of underwater target tracking and positioning system,the Adaptive Notch Filter which is used to detect receiving signal,can guarantee high correct rate of detection in low SNR.Using FPGA instead of DSP to implement hardware Notch filter is proposed,and DDS technology is used to solve the problem of the orthogonal reference source input for the Notch Filter.This method can not only simplify the system design and improve the stability,but also maintain high correct rate of detection.