基于状态和残差的北斗基准站观测数据表达与信息分级

北斗卫星导航系统基准站通常直接存储传输原始观测量，导致了两种不利情况：①没有形成对用户的分级授权机制，任意用户通过原始观测量都可以获取基准站的精确空间基准、时间基准和大气基准数据，这会对基准站的安全构成潜在威胁；②原始观测量之间的强相关性导致其数据量很大，在北斗接收机观测显现网络化、不间断、高采样和多波段的趋势下，观测数据的海量爆发给数据的存储和传输都带来了巨大的压力。因此，本文提出利用状态和残差来表达北斗基准站观测数据。与通用的基于RINEX、Compact RINEX和RTCM等国际协议的数据服务相比，其优点是不但可以对不同级别用户进行信息分级授权，从技术上保障数据服务的安全，而且大幅减小了存储传输数据量和用户端计算量。同时本文证明了新的表达方式与原始数据等效，不会降低最终计算结果的精度。利用该方法可以建立具有自主知识产权的北斗观测数据存储和传输协议，并为高精度星基数据播发服务提供技术支持。

Expression and information hierarchical authorization of BDS reference station observation data based on states and residual

BDS reference stations typically store and transmit raw observations directly and make them available to users, which can lead to two disadvantages:first, there is no hierarchical authorization mechanism for users. Any user can solve the precise spatial, time and atmospheric datum information of the reference station through the original observation measurement, which poses a potential threat to the safety of the reference station, second, the strong correlation between the original observation measurement leads to a large amount of data, in BDS receiver observation appears network, uninterrupted, high sampling and multi-band trend, its observation data is a massive explosion, to the data storage and transmission have brought great pressure. Therefore, this paper proposes to use state and residual to express the raw observation data of BDS reference station. Compared with the common data services based on international protocols such as RINEX, Compact RINEX and RTCM, the advantage of this method is that it cannot only provide hierarchical authorization service of datum information for users, technically guarantee the security of data services, but also significantly reduce the amount of transmission data and user-side computation. At the same time, the new expression is equivalent to the original data and does not reduce the accuracy of the final calculation results. This method can be used to establish BDS observation data storage and transmission protocol with independent intellectual property rights, and provide technical support for satellite-based broadcasting services of high-precision data.