CORS系统的差分定位终端设计与实现

Design and implementation of differential positioning equipment based on continuously operating reference station

当前广泛使用的实时GNSS定位应用可分为两种:一种是低成本定位应用,其采用廉价的芯片和天线,广泛应用于手机、共享单车和公交车定位等方面;另一种是高精度GNSS定位应用,采用网络RTK技术并结合测量型天线和接收机,为高精度测量用户提供实时厘米级测量服务。随着物联网、5G等技术的发展,实时分米到亚米级的定位需求逐渐增多。原有的低成本GNSS定位技术无法达到这一精度要求,高精度定位的设备成本高昂,无法用于大众导航领域。因此,本文实现了一种基于CORS系统的低成本差分定位终端。该终端包括两个部分:外接设备和手机。试验表明,在接入CORS系统后,该设备水平方向的定位精度可以达到亚米级,对推进CORS系统的大范围应用具有一定的意义。

Global satellite navigation positioning (GNSS) technology provides an effective means of real-time positioning for industries.Currently widely used real-time GNSS positioning technology can be divided into two types,one is low-cost positioning technology,which uses cheap chips and antennas,mainly used in mobile phones,shared bicycles and bus positioning,etc. The other is high precision GNSS positioning technology,which uses network RTK technology combined with geodesy antennas and receivers to provide real-time centimeter-level services for high-precision survey users. With the development of technologies such as the Internet of things and 5G,the requirements of real-time sub-meter and decimeter-level positioning are gradually increasing. The original low-cost GNSS positioning technology cannot meet this precision requirement,and the high-precision positioning equipment is expensive and cannot be used in the mass-market. Therefore,this paper implements a low-cost differential positioning equipment based on CORS. The equipment consists of two parts: external devices and mobile phone. Experiments show that after accessing the CORS,the positioning precision of the horizontal can reach sub-meter level with the accurate VRS observations of the CORS. This paper has certain significance for promoting the wide application of CORS.