摘要
针对传统调频引信在不同环境温度下由于调频带宽和调频线性度变化影响定距精度的问题,提出采用锁相方法产生三角波调频信号提高引信定距精度。该方法基于具有快速波形产生功能的小数分频频率合成器,通过对反馈频率与参考频率进行鉴相、锁相,产生调制三角波,经滤波平滑后调谐VCO输出锁相三角波调频信号。试验结果表明,在不同环境温度下,锁相三角波调频引信调频带宽变化远小于传统三角波调频引信,调频线性度优于传统三角波调频引信,由调频带宽变化和调频非线性带来的定距精度误差可以忽略不计,锁相调频可以降低引信定距误差。
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 different 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 filtering and smoothing,tuned the voltage-controlled oscillator(VCO)to output a phase-locked sawtooth wave frequency 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 traditional 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-finding error of the fuze.
作者
杜英森
黄辉
王大鹏
张珂
DU Yingsen;HUANG Hui;WANG Dapeng;ZHANG Ke(No.212 Institute of China Ordnance Industry Corporation,Xi'an 710065,China;Science and Tednnology on Electromechanical Dynamic Control Laboratory,Xi'an 710065,China)
出处
《探测与控制学报》
CSCD
北大核心
2024年第4期58-62,100,共6页
Journal of Detection & Control
关键词
锁相调频引信
频率合成器
定距精度
调频带宽
线性度
phase locked FM fuze
frequency synthesizer
ranging accuracy
frequency modulation bandwidth
linearity
