Frequency Agility Fm Set From The Signal Processing Research

This paper analyzes the technology of frequency agility and FM fixed-distance in the field of radio fuze. On the base of researching the difference frequency's signal of sawtooth waveform linear FM fixed-distance system and frequency agility and FM fixed-distance system, it is obtained that the existence manners and character of distance information in the differential frequency signal. Conclusions are gained that the constant error of frequency agility and FM fixed-distance system is less than that of sawtooth waveform linear FM fixed-distance system, the envelopment of amplitude spectrum of difference frequency' s signal of frequency agility and FM fixed-distance system is very complex and it is not a sample function and the largest amplitude of frequency is the one that closest to primary frequency. Several arithmetic of frequency domain analysis and Digital Method of frequency measurement are discussed. The method of frequency measurement by period is improved. At last, the improved frequency measurement by period and distributed arithmetic FIR filter are designed with FPGA.