摘要
介绍了接收机自主完好性监测算法及其可用性的基本原理,介绍了伪卫星的导航原理和关键技术,推导了伪卫星增强条件下的RAIM(Receiver Autonomous Integrity Monitoring)算法,并给出了观测权阵的计算公式。用STK(Satellite Tool Kit)进行仿真分析,结果表明:在GPS系统下,RAIM可用性按照远洋、本土、终端、NPA和APV-I的顺序依次减小,单一的GPS导航无法满足APV-I以上等级的航空飞行需求;伪卫星增强后的RAIM可用性大幅度提高,其中在APV-I阶段RAIM算法100%可用;误警率、漏警率和故障识别率都有所改善;错误识别率高于漏检率,错误识别是漏警的主要原因。
This paper introduced basic theory of RAIM and its availability, and analysed navigation principle and key technology of pseudolite. This paper also deduced RAIM algorithm with pseudolite-aided, and gave calculation formula of weighed observation matrix. Results from STK simulation showed： Under Global Positioning System, RAIM availability was lower in order of ocean, domestic, terminal, NPA and APV-I, while single GPS as navigation method could not meet aviation needs above APV-I phase; RAIM availability was improved greatly with pseudoliteaided, RAIM was 100 percents available during APV-I phase; Probability of False Alarm, Probability of Missed Detection and probability of false identification were improved; false identification probability was much higher than missed detection probability and false identification was the chief cause of missed alarm.
出处
《天文学进展》
CSCD
北大核心
2009年第1期89-97,共9页
Progress In Astronomy
关键词
RAIM
HPL
故障检测
故障识别
伪卫星
Receiver Autonomous Integrity Monitoring
Horizontal Protection Level
fault detection
fault identification
pseudolite
