结合实时数据产品与北斗短报文的厘米级海洋精密相对定位

Centimeter-level ocean precise relative positioning by combining real-time data products and BeiDou short-message

针对远海精密定位的广泛需求和传统精密定位服务费用昂贵的问题,提出利用北斗短报文设备传输导航观测数据,结合实时服务数据产品,以实现海洋的低成本厘米级精密相对定位。为了克服短报文传输频率低的缺点,采用融合空间相对定位和精密单点定位两种技术来加密分钟间隔以外的坐标,避免了传统时间基线法加密坐标存在的误差累积现象。分别基于静态和动态海洋观测数据进行仿真实验,结果表明,新方法无论在水平方向还是垂直方向上,都可以实现厘米级定位,且对时间间隔不敏感。

In view of the wide demand for precision positioning in the ocean and the high cost of traditional precision positioning services, it was proposed to use BeiDou short-message equipment to transmit navigation observation data, combined with real-time data products, to achieve low-cost centimeter-level precise relative positioning in the ocean. In order to overcome the shortcomings of low transmission frequency of short messages, for the first time, the two technologies of fusion spatial relative positioning and precise point positioning were used to encrypt coordinates outside the minute interval, avoiding the accumulation of errors in the encrypted coordinates of the traditional time-relative method. Simulation experiments were carried out based on static and dynamic ocean observation data. Results show that the new method can achieve centimeter-level positioning in both horizontal and vertical directions, and the results show that the new method is not sensitive to the length of time interval.