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中文摘要：
分析IRNSS星座结构及特点,通过对印度区域格网点几何精度因子的计算,讨论了IRNSS系统在服务区内的定位精度;以星座值和单点可用性为依据,分析IRNSS星座完整及失效一颗星情况下星座的可用性。结果表明：IRNSS导航系统星座设计合理,具有良好的区域覆盖性,印度及向外延伸2000km区域内的用户可以获得10m左右的定位精度;星座结构具有一定的冗余度,稳定性较好,以PDOP小于6为阈值,在一颗卫星失效情况下仍具有95%以上的可用性。
英文摘要：
The structure and characteristics of IRNSS constellation were analyzed.Positioning accuracy is discussed by analysing dilution of accuracy.Based on availability of single point and constellation value,constellation availability is studied when constellation is normal or one of satellites is failure.Results show that the design of IRNSS navigation system is reasonable and it has a good regional coverage.About 10m positioning accuracy can be achieved in India and in the area outside with the extension of 2 000 km.The constellation structure has a certain redundancy as well as good stability.Given a limitation of PDOP 6,at least 95% availability can be achieved when one satellite is failure in these regions.
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