The Fuze Ranging Precision Error Optimized by Phase Locked
The traditional frequency-modulated(FM)fuzes,which produce modulated sawtooth waves using RC integrator circuits,were affected by variations in frequency modulation bandwidth and linearity under differ-ent ambient temperatures,thus impacting the range-finding accuracy,this paper proposed the use of a phase-locked loop(PLL)method to generate the sawtooth wave frequency modulation signal for the fuze.This method was based on a fractional-N frequency synthesizer with rapid waveform generation capabilities.By phase-locking the feedback frequency to the reference frequency,a modulated sawtooth wave was produced,which,after filte-ring and smoothing,tuned the voltage-controlled oscillator(VCO)to output a phase-locked sawtooth wave fre-quency modulation signal.Experiments demonstrated that under different ambient temperatures,the variation in the frequency modulation bandwidth of the phase-locked sawtooth wave FM fuze was significantly less than that of the traditional sawtooth wave FM fuze,and the frequency modulation linearity was superior to that of the tra-ditional fuze.The range-finding accuracy error caused by changes in frequency modulation bandwidth and non-linearity could be considered negligible,and the phase-locked frequency modulation could reduce the range-find-ing error of the fuze.
phase locked FM fuzefrequency synthesizerranging accuracyfrequency modulation bandwidthlinearity
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