基于正交调制的激光测距系统和解模糊方法

摘要

We propose a laser rangefinder system based on the quadrature modem to achieve a mplitude modulation,the method improves the accuracy of the phase measuring and simplifies the hardware design compared to the system with the secondary mixing methods,and to solve the range ambiguity caused by the measuring process,the ranging ambiguity resolving algorithm based on the over-determined equatio n is proposed,which avoids the searching of the optimal solution,finally the t wo K60 laser rangefinders and three proposed rangefinders were experimented on t he national standard baseline with the precision of 0.18 mm.the measuring time of the proposed system is less than 1.8 s,the average measuring error of thos e three prototypes is less than 2 mm,and the standard deviation is less than 1 mm within the measuring range 0~60 m.The experimental results show that the pro posed design system of the rangefinder has higher measurement accuracy and speed in comparison with the traditional ones,which indicates the high reliability o f the proposed design system.%提出一种基于正交调制的激光测距系统,该方案与传统的二次混频方法相比,提高了相位测量精度并简化了系统的硬件设计,针对距离测量过程中的距离模糊问题,提出了一种基于超定方程组的距离解模糊算法,避免了对最优解的搜索,最后使用2台K60激光测距仪和3台基于本方案的测距仪在精度为0.18 mm的国家标准基线上进行对比试验,结果显示,测距时间少于1.8 s,平均测量误差在2 mm以内,在60 m的量程内测距标准差在1 mm以内,验证了该方案相比较传统的方法具有更高的测量精度和速度.