【摘要】 从微波测距仪相位法测距和自动数字测相原理出发,分析了微波测距仪计数频率漂移对测距精度的影响,得出了计数时钟的频率出现漂移时,对微波测距仪的测距精度将造成较大的影响,形成了计数时钟频率漂移误差。针对这种误差设计了一种基于单片机的频率校准电路,通过反馈原理提高了晶体振荡器输出频率稳定性,稳定了计数时钟频率,达到减小计数时钟频率漂移误差的目的。实测数据表明:控制电路有效控制了频率漂移,提高了微波测距仪的测距精度。更多还原

【Abstract】 Microwave rangefinder and the influence between the distance-measuring precision and its counting frequency drift are analyzed.A kind of frequency control circuit is designed to weaken the counting frequency drift.The frequency stability of the crystal oscillator as well as the counting frequency is improved via feedback control.Analysis on the measuring data indicates that the counting frequency drift is weakened effectively,which guarantees higher level of distance-measuring precision.更多还原