GPS局域增强系统基准站多路径抑制消除技术  

Technique of multipath-free to GPS local area augmentation system

作　　者：宋超[1] 李景森[1] 皮寿熹[1] 

机构地区：[1]天津航海仪器研究所,天津300131

出　　处：《中国惯性技术学报》2010年第2期204-208,共5页Journal of Chinese Inertial Technology

摘　　要：GPS局域增强系统(LASS)作为飞机精密进场和着陆的最重要的导引系统,使得飞机进场过程实现全面GPS化。但是,由于DGPS多路径效应误差的存在极大地影响了LASS系统的性能,降低了飞机进场过程的导航精度。因此从多路径效应误差产生原理入手,通过分析多路径效应误差的特性和建立多路径效应误差信道模型,并在此基础上提出了运用特殊设计的多路径抑制天线以及利用动态基准站和双差测量技术抑制多路径误差的方法。运用该方法,不仅能避免飞机机身反射信号所引起的多路径效应,还可以对地面及地面物体反射引起的多路径效应误差起到很好的消除作用,从而极大地改善LASS的性能,提高飞机进场过程的安全性和导航精度。GPS local area augmentation system（LASS） is the most important navigation system in airplane＇s precision landing. Owing to the multipath effect error of DGPS, the performance of local area augmentation system is decreased, so the precision of airplane＇s landing is dcreased too. Based on the cause of multipath effect errors, the error＇s characteristics are analyzed and its channel model is set up. Then the method for decreasing multipath effect error is put forward which adopts specially designed multipath restraining antenna. The method can eliminate the multipath effect error caused by airplane, and decrease the multipath effect error caused by ground. The performance of LASS is improved, and the security and navigation precision of airplane＇s landing are enhanced.

关 键 词：GPS 局域增强系统 多路径效应 基准站 导航 

分 类 号：U666.1[交通运输工程—船舶及航道工程]