精确测距原理及实现技术

The Principle and Realizing Technique of Accurate Measuring Distance

论述了在主动调频连续波 (FMCW)体制测距引信中实现精确测距的原理及其实现技术。该技术利用三角波调制周期进行定时计数 ,并且结合锁相环窄带跟踪滤波技术 ,能有效地去除由于 VCO(压控振荡器 )的非线性带来的测距误差 ,实现简单 ,不增加用于 VCO非线性校正部分的体积。经过试验证明该技术简单、可靠 。

This paper describes the principle and realizing technique of measuring distance, for measuring distance fuze with the system of frequency modulation continuous wave (FMCW). The technique can eliminate the error of measuring distance, the error comes from the non linearity in voltage control oscillator (VCO). The technique insists of timing counting of the pulse in the period of the triangle wave, track and filter in narrowband with phase lock loop (PLL), so that it is simple to realize, and don't increase the volume of non linearity correction in VCO. It is proved that the technique id simple and viable in testing, the testing result accords with the model of theories calculation.