歼击机对GPS辅助的惯性导航系统精度要求

Accuracy Requirement of GPS-Kalman Augmented Inertial Navigation System for Fighter Aircraft

本文研究全球定位系统(GPS)辅助的歼击机惯性导航系统(INS)所应满足的精度要求,并分析了组合系统的效费比。系统性能与飞行轨迹和导航电子设备的性能参数有关。系统设计中应对它们进行综合考虑。利用卡尔曼协方差分析估算了各种干扰环境以及采用不同精度等级的INS时组合系统的导航性能。分析结果表明,CEP为7.4-15km/h的INS与GPS相组合,能满足歼击机的攻击性能要求。与目前常规导航系统相比,采用捷联惯导的组合系统,其成本可减小36-60％。

This paper examines the accuracy requirement of a Global Positioning System (GPS)-aided Inertial Navigation System (INS) for fighter aircraft. The integrated system performance depends both on the mission route and avionics performance parame- ters. Their tradeoffs should be considered in the system design. Kalman covariance analysis are used to analyze the overall navigation performance in a jamming environment and for various INS qualities. Based on the analysis results,it is expected that an INS with an accura- cy of 7.4 to 15km/h Circular Error Probable (CEP)may meet the performance reqirements when aided by GPS for fighter weapon delivery. A 36 to 60 percent cost saving over conven- tional fighter navigation systems is predicted by employing the configuration with a strap- down INS.