摘要
调频定高引信是一种采用调频连续波测距基本原理,实现在某确定高度引爆弹药战斗部的近炸引信。由于弹药末端的较大落速,会在近炸引信的信号处理过程中引入多普勒频移,从而使定高引信产生误差。基于对称三角波调制的连续波体制,对差频信号采样后利用快速傅里叶变换,计算得到回波信号相对于发射信号的频率偏移,并以20~100 m为例,对定高引信进行了设计与仿真,并对高速再入环境下的定高精度、抗噪性能做出分析。仿真结果声明,采用对称三角波的调频定高引信能够避免多普勒效应的影响,实现精确定高。
The frequency modulation altimeter fuze is a kind of proximity fuze which makes use of basic principles of frequency modulation continuous wave ranging to detonate warhead of ammunition in a given height.Due to the large fall velocity of ammunition,the Doppler frequency shift is introduced in the signal processing,so errors of altimeter fuze are generated.Based on symmetrical triangle wave modulated continuous wave,taking 20 ~ 100 m as an example,the altimeter fuze is designed and simulated by using fast Fourier transform after sampling the beat frequency signal and calculating the frequency shift of echo signal with respect to transmitted signal.And the precision of height measurement and anti-noise performance in large fall velocity are analyzed.The simulation results show that the altimeter fuze using symmetrical triangular wave modulated continuous wave can avoid the influence of Doppler effect to achieve high-precision height determination.
出处
《无线电工程》
2016年第1期61-64,共4页
Radio Engineering
基金
国家自然基金青年基金资助项目(61305131)
