基于导航定位服务性能的GNSS天线阵抗干扰统计性能评估方法

摘要

Statistical performance evaluation based on available ratio of antijam antenna array has been considered a common viewpoint for GNSS evaluation. But in some aspects, the traditional evaluation method has several deficiencies as follows: the first is the hypothesis of independent uniform distribution of signal DOA, which is not in accordance with the navigation constellation; the second is the single signal available ratio which is unable to meet the navigation requirements. Aiming at these two problems, the research extended the average available ralio of single signal to the average solution probability and navigation service availability which are associated with the navigation solution performance. Finally, the new index was validated by a simulation under the COMPASS navigation constellation.%基于可用率指标的天线阵统计性能评估方法已成为GNSS天线阵性能评估的共识,但在指标体系及具体细节上,传统的评估方法尚存在不足之处.一是对信号作独立均匀入射的假设,与实际星座特性相差较大,二是单信号可用率指标尚无法满足GNSS接收机对导航定位的需求.针对这两方面的问题,提出了可定位概率、服务可用性等与接收机导航定位服务性能相关联的新指标.结合实际导航卫星星座的分析验证了新指标的有效性.