一种利用载波相位差值的伪卫星定位方法

针对卫星定位技术无法应用于室内环境的情况，提出了一种新颖的利用载波相位差值的伪卫星定位方法，该方法能够实现亚米级的定位精度，而且无需基准站的支持，无需伪卫星之间的时钟同步，也不需要求解整周模糊度。构建了伪卫星定位的系统模型，并阐述了利用载波相位差值进行定位的基本原理。首先将双天线接收机输出的两组载波相位测量值进行单次差分操作，消除共有误差带来的影响，然后通过非线性最小二乘方法迭代解算出双天线连线中点的空间位置。仿真结果和基于双通道软件接收机的实测数据均证明了该方法的可行性，能够作为现有室内定位技术的有效补充。

A Pseudolite Positioning Approach Utilizing Carrier Phase Difference

GNSS receiver could not be used in indoor environments. This paper proposes a novel pseudolite positioning approach utilizing carrier phase difference measurements, which can achieve sub-meter accuracy without the support of a base station, and without the need of synchronization between pseudolites. In addition, in the proposed approach, the integer ambiguity resolution is unnecessary as well. This research builds up system model for pseudolite positioning and proposes basic principle for this positioning method utilizing carrier phase difference measurements. First, two sets of carrier phase measurements output from a dual-antenna receiver are differentiated in order to cancel out the common errors. Then a non-linear least square adjustment method is used to solve spatial coordinates of center point of the dual-antenna iteratively. Simulation results and experiment outputs from a dual-antenna software receiver verified the feasibility of this approach. This pseudolite positioning approach can be regarded as an effective complement of existing indoor positioning techniques.