基于共生调频数据广播的北斗地基增强系统设计和性能测试

Design and Performance Test of BDS Ground-based Augmentation System Based on Symbiotic FM Data Broadcasting

探讨了共生调频数据广播(CDRadio)技术与北斗卫星导航系统(BDS)学科交叉技术创新所产生的基合导航系统(Kinhood System),也称BDS-CDRadio。该系统采用CDRadio广播技术传输卫星定位差分修正数据。它具有典型的信息共享性质,没有用户数量限制,没有通信系统的并发约束,时延短且稳定可靠;基合导航系统的发射端硬件设备基本共用原有广播设施,投入小、覆盖范围广,能够为海量大众用户提供成本极低的高精度实时导航定位服务。国家广播电视规划院和国家基础地理信息中心检测表明:基合导航系统数字和模拟信号同播时,播出的模拟调频信号符合国家标准;在数模功率比为-20 dB时,播出的数字信号与模拟信号达到同等半径覆盖;特别是在高动态场景下,接收广播方式的差分修正数据较移动通信方式具有更高的稳定性。

This paper explores the Kinhood System （BDS-CDRadio） generated by a cross-domain technical innovation of the symbiotic FM data broadcasting technology （CDRadio） and BeiDou Satellite Navigation System （BDS）. The system uses CDRadio broadcast technology to transmit differential correction data of GNSS. With a typical information sharing nature, it has no user scale limits, no concurrency constraints that normally happened in a communication system,and makes a short time-delay which is stable and reliable. The Kinhood transmitting section basically shares original radio broadcast facilities with a small input but wide coverage, which provides extremely low cost,high precision and real-time services of GNSS for massive numbers of receivers.The top third-party authorized tests by Academy of Broadcasting Planning and National Geomatics Center of China prove that： the Kinhood symbiotic digital broadcast keeps the analog FM signal quality in line with the national FM standard, and the digital signal coverage is same as that of analog FM signal at the digital-analog power ratio of -20 dB.The Kinhood System has ideal ground-based augmentation results, especially in the high dynamic scenarios, differential correction data receptions from the radio broadcast enjoy higher stability than the mobile communication transmission.