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基于WAAS监测数据的精度和完好性参数解算
引用本文:倪育德, 张天阳. 基于WAAS监测数据的精度和完好性参数解算[J]. 空间科学学报, 2019, 39(4): 502-511. doi: 10.11728/cjss2019.04.502
作者姓名:倪育德  张天阳
作者单位:中国民航大学电子信息与自动化学院 民用航空器适航审定技术重点实验室 天津 300300
基金项目:国家重点基础研究发展计划项目资助(2016YFB0502402)
摘    要:美国联邦航空管理局(FAA)建设的广域增强系统(WAAS)通过对全球定位系统(GPS)所需导航性能(RNP)的全面增强,目前已能在WAAS服务区的绝大部分空域支持从航路到具有垂直引导满足航向信标性能(LPV)-200进近的RNP.本文给出了WAAS报文的解码过程,结合WAAS广播报文阐述了精度和完好性参数的解算处理过程.选取美国阿拉斯加州和美国本土34个WAAS监测站的实测数据,按该处理流程解算出精度和完好性参数.结果表明,所选监测站位置的精度和完好性解算结果与美国国家卫星测试台(NSTB)公布的统计数据基本吻合,验证了报文解码以及参数提取算法和流程的正确性.WAAS精度和完好性参数解算处理流程可为中国北斗星基增强系统(BDSBAS)建设提供借鉴和参考.

关 键 词:星基增强系统   广域增强系统   水平位置精度因子   高程精度因子   水平保护级   垂直保护级
收稿时间:2018-05-08
修稿时间:2019-01-22

Calculation of Accuracy and Integrity Parameters Based on WAAS Monitoring Data
NI Yude, ZHANG Tianyang. Calculation of Accuracy and Integrity Parameters Based on WAAS Monitoring Data[J]. Chinese Journal of Space Science, 2019, 39(4): 502-511. doi: 10.11728/cjss2019.04.502
Authors:NI Yude  ZHANG Tianyang
Affiliation:Key Laboratory of Civil Aircraft Airworthiness Technology, Civil Aviation Administration of China;School of Electronics and Automation, Civil Aviation University of China, Tianjin 300300
Abstract:The Wide Area Augmentation System (WAAS) is a Satellite-based Augmentation System (SBAS) developed by the United States. It broadcasts correction information in the form of message and enhances the Required Navigation Performance (RNP) for the Global Positioning System (GPS). WAAS supports most of the airspace in its service area from the RNP of route to Localizer Performance with Vertical Guidance (LPV)-200 approach. The process of decoding and the parameter extraction of WAAS message is given. The accuracy and integrity parameters in RNP indicators are analyzed, and the algorithms of accuracy and integrity indicators are described. The measured data of 34 sites in Alaska and the Continental United States are selected to calculate the accuracy and the integrity parameters. The results show that the accuracy and integrity calculation of the selected sites are basically consistent with the statistical data released by the National Satellite Test Bed (NSTB). It verifies the correctness of the message decoding and the parameter extraction algorithm, and provides reference for the construction of China's Beidou Satellite-based Augmentation System (BDSBAS). 
Keywords:SBAS  WAAS  Horizontal Dilution of Precision (HDOP)  Vertical Dilution of Precision (VDOP)  Horizontal Protection Level (HPL)  Vertical Protection Level (VPL)
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