Research Of Broadband High Speed Frequency Hopping Signal Reconnaissance

Frequency hopping(FH) communication is an effective means to improve the anti-jamming and anti-interception ability of signal. So the research of FH signal reconnaissance receiver has important military significance.Firstly, we analyze the principle of frequency hopping communication transceiver and present the mathematical expression of frequency hopping signal and the meaning of some parameter in time-frequency analysis. Besides, to find the best time-frequency representations(TFRs) for the FH system implementation, we analyze the performance of various TFRs in time-frequency concentration and computation complexity.Secondly, we study and analyze three kinds of frequency hopping signal reconnaissance receiver, including the traditional FFT receiver, compressed sensing(CS) receiver and digital channelized receiver. And we focus on the theoretical implementation structure and simulations of CS receiver and digital channelized receiver based on poly-phase filter.Thirdly, based on the sparsity of frequency hopping signal, energy detection and digital channelization technology, we propose a novel estimation algorithm for FH hop-time and hop duration. The design of noise floor calculation, carrier frequency and bandwidth estimation is based on the results from hop-time estimation. We also present numerical simulations to verify the correctness of our design.At last, several implementation problems in FH blind de-hopping system realization are discussed. We analyze and solve several problems in high-speed and stable data transmission. Based on the consideration of resources and system clock, we present time sharing structure for FIR filter and FFT. And a low-cost implementation structure for parallel filter is proposed. Final test on board is given for verifying the correctness of our design.