一种高精度大动态范围的距离模拟脉冲发生方法研究

现有的产生距离模拟脉冲的方法中,数字延时电路只能达到ns量级的精度,模拟延时电路的延时范围又不足够作为距离模拟脉冲的使用,为了实现高精度大动态范围的延时,来产生激光测距仪的距离模拟脉冲,在研究了现有方法的基础上,采用了数模结合的方案,设计了一种同时满足高精度和大动态范围的延时脉冲信号发生电路,并对其精度和重复性进行了测试,可以实现2 s～4 ms 的延时范围并具有0.1 ns的延时精度,即可以模拟300 m～600 km的距离并具有 1.5 cm的距离精度。解决了现有的距离模拟电路无法同时满足高精度、大动态范围的矛盾。

A method of generating high precision large dynamic range distance simulation pulse

Among the existing motheds of generating distance simulation pulses, digital delay circuit can only achieve the accuracy of ns order, while analog delay circuit does not have enough delay range used as distance simulation pulse. In order to realize delay of high precision and large dynamic range to produce the distance simulation pulse of laser range finder, based on the analysis of the current circuit, the circuit structure combining both the digital circuit and analog circuit was proposed in this article, which would satisfy both the high accuracy and large dynamic range. Its accuracy and repeatability were tested, and the results can reach 2 s-4 ms range of delay and 0.1 ns delay precision, which can simulate the distance of 300 m-600 km and achieve the distance accuracy of 1.5 cm. The method of generating distance simulation pulse proposed in this article can solve the problem of incapable of achieving high precision and large dynamic range simultaneously, existing in current distance simulation circuit.