渐进提高精度的载波相位测距技术

Gradually improving accuracy ranging technique based on carriers

提出了一种静止、可视两目标之间基于载波相位高精度测距技术:第一步,借助GPS、伪随机码相位自主测距或超宽带等辅助测距手段得到一个距离粗测值和测量精度;第二步,基于已有距离粗测值和测量精度选择载波频率对,消除基于载波相位测距时引入的整周模糊度问题,然后基于载波相位双-单边测距技术,并借助伪码相位消除两目标上面载波相位观测时间差,得到一个精度更高的距离测量值;基于新得到的距离测量值和测量精度,重复第二步过程,渐进提高测距精度直到满足需要的精度为止。理论分析和现有工程技术实现表明,最终测距精度可达微米级。

A novel carrier-based ranging technique for two stationary and visible objects is proposed. Firstly, a coarse measured range value with low accuracy is obtained by convential ranging techniques, such as global position system（ GPS）, pseudorandom code phases autonomy ranging and uhra-wideband ranging; Secondly, one double-carrier frequencies according to the accuracy and the coarse measured range value are selected to make the carrier-cycle integer ambiguity disappear. Then, the carrier-based double-one-way ranging technology is used to measure the range again and obtain a new range value with higher accuracy. At this step, the pseudo-random code is used to obtain the time interval for measuring the carrier phases. Finally, based on new measured value and accuracy, the second step to improve the accuracy step by step is repected until the accuracy is satisfying. Teoretical analysis results and engineer- ing fulfillment show that the accuracy can reach micron-level.