Interference Detection Method Based on DTFRFT-FCME and Joint Multi-threshold Judgment

Anti-jamming receivers are an important research direction in positioning navigation. In this paper, we study the interference detection scheme for 5G communication-positioning integrated signal (CPIS) positioning receiver in the new transform domain. In order to solve the problems of low detection probability and high false alarm rate of FCME algorithm in the environment of sharp change of dry noise ratio, we propose to add joint judgment of medium threshold and high threshold on the basis of the original low threshold to improve the detection accuracy, and reduce the computational complexity of the original scheme by adopting difference strategy. Meanwhile, the instantaneous frequency estimation method for TFD quantization error frequency shift is introduced to provide high accuracy parameter estimation for FRFT and reduce the hardware resource consumption caused by traversing the best transformation order. The experimental results show that the algorithm effectively improves the interference detection performance of 5G CPIS receivers at low dry noise ratio.