利用差分GPS/INS进行飞机精密进场着陆的可行性

Feasibility of Using Differential GPS/INS for Aircraft Precision Approaches

文中研究利用全球定位系统(GPS)进行飞机精密进场着陆的可能性。着重讨论了系统的精度,带伪卫星(PL)的差分GPS技术及GPS接收机的惯性信息辅助等问题。研究结果表明,按GPS联合计划署(JPO)所确认的纯GPS性能,目前它尚不能满足国际民航组织(ICAO)制定的精密着陆技术要求。采用常规差分GP5达不到ICAOⅠ类精密进场着陆的垂直精度指标。带伪卫星的差分GPS除能连续校正GPS信号的偏置误差外,还能明显改善系统的几何精度因子。惯性信息辅助可以改进着陆制导过程申组合系统的动态特性,提高强干扰及机动飞行中卫星信号的快速捕获性能。利用有PL的差分GPS/INS系统可以实现ICAOⅠ类精密进场着陆。

The feasibility of using differential GPS(DGPS)for aircraft precision approach and landing is investigated.The issues addr- essed are system accuracy,DGPS with one or two ground-based Pseudo Lites(PLs),and inertial data aiding of GPS receivers.The results of the investigation show that GPS performance,as Specified by the GPS Joint Program Office(JPO),does not presently satisfy precision ap- preach requirements as specified by the International Civil Aviation Or- ganization(ICAO).Even using conventional differential GPS,the System does not achieve the required vertical accuracy of Category I Operation. DGPS with PLs perform a double function:they both calibrate the lo- cal ranging errors and significantly improve the user's Geometric Ditu- tion of Precision(GDOP):The main function of INS aiding is to im- prove the dynamic performance of integrated GPS/INS system and to maintain eode tracking in a high noise environment.The analyses re- sultsindicate that PL aided DGPS/INS system can satisfy the accuracy requirements for ICAO Category I precision approaches.