摘要
针对传统调频引信因使用RC三角波发生电路会引起回波的指数非线性变化,因缺乏相应回波模型而无法定量分析的问题,提出了调频引信的指数型回波建模方法。该方法给出了周期性指数型三角波调制发射信号的频率分段解析式,对其在每个调制周期内进行定积分后归纳出连续性瞬时相位的一般解析式,该解析式与其相应延时信号作差拍处理后即可得到调频引信的指数型回波模型,在此基础上分析了指数非线性对距离分辨率的影响并给出了新的计算方法。按照指数型回波模型进行仿真计算可以更准确地定量分析调频引信的回波频谱和距离分辨率。仿真对比结果表明该模型有效,当指数非线性度大于5%时实际回波频谱会展宽,造成距离分辨率相对于理想线性条件下恶化。
The exponential nonlinearization will be caused in echo of traditional LFMCW fuze by using RC-circuit to generate triangle wave.Since the quantitative analysis was not feasible without the corresponding echo model,to solve this problem,a method of exponential echo modeling was put forward in this paper.Firstly,A frequency piecewise transmitting signal analytical equation of periodical exponential triangular wave was present.Then a continuity general analytical equation of instantaneous phase was induced by definite integration in each modulation period.The exponential echo modeling of LFMCW fuze will be obtained after a beat processing between the general analytical equation of instantaneous phase and its delay.On this foundation,a theoretical analysis on effect of exponential nonlinear to range resolution was performed and a new computational method was given.The contrast results of simulation indicated the effectiveness of the modeling.The actual spectrum of echo signal would be broadened when the exponential nonlinearity was greater than 5%,which resulted the worsen of range resolution contrast to the situation of ideal linearity.An even accurate quantitative analysis on spectrum of echo signal and range resolution were given by f exponential echo modeling simulation.
作者
智小军
周守锋
黄辉
ZHI Xiaojun;ZHOU Shoufeng;HUANG Hui(Xi'an Institute of Electromechanical Information Technology,Xi'an 710065,China)
出处
《探测与控制学报》
CSCD
北大核心
2019年第5期1-6,共6页
Journal of Detection & Control
基金
引信动态特性国防科技重点实验室基金项目资助(614260103030317)
