北斗三频海基JPALS无故障导航算法

摘要

基于卫星导航系统的海基精密进近与着陆系统(JPALS)是未来舰载机自主着舰引导技术的发展方向.针对当前海基JPALS导航算法的研究都是基于双频观测量,存在无几何滤波时间长、要求的伪距观测量精度较苛刻的问题,提出一种在北斗(BDS)海基JPALS中使用三频观测量的无故障导航算法.通过对在中国东海钓鱼岛海域7天时间使用该导航算法用于精密进近引导的性能进行仿真分析,结果表明:该北斗海基JPALS无故障导航算法使用B1/B2宽巷和B1/B3中巷组合的无几何模糊度预滤波架构只需要8 min无几何滤波时间就能实现海基JPALS要求的性能,而且其对伪距观测量的精度要求甚至可以放宽到50 cm,使北斗海基JPALS的可用性性能大大提高.此外,载波相位观测量精度不能超过0.7 cm时,该北斗三频海基JPALS算法能在3 n mile外就实现模糊度固定,使高精度载波相位提早用于海基JPALS精密进近引导.%Based on the navigation satellite system,sea-based Joint Precision Approach and Landing System (JPALS) represents the direction of future development of the shipboard aircraft auto-landing technology.The current researches on seabased JPALS navigation algorithm is based on dual-frequency measurements,which has the problem of long geometric-free filtering period and stringent requirement of the accuracy of pseudo-range measurements.So in this dissertation,prototype algorithms for sea-based JPALS based on triple-frequency measurements of Beidou Navigation Satellite System (BDS) is proposed.The results of 7 days simulation analysis at sea area of China Diaoyu islands show that it only takes 8 min of geometric-free filtering time for this three-frequency navigation algorithm to achieve the required performance of sea-based JPALS by using the B1/B2 Wide-Lane and B1/B3 Medium-Lane combination for triple-frequency geometric-free ambiguity pre-filtering algorithm.And the availability performance of BDS triple-frequency sea-based JPALS can be enhanced greatly even if the accuracy of pseudo-range measurements is relaxed to as much as 50 cm.And another advantage of this BDS triple-frequency sea-based JPALS algorithm is,when the accuracy of the carrier phase measurements is within 0.7 cm,it can fix the ambiguity at 3 n mile away from the aircraft carrier,which leads to the earlier application of high precision carrier phase measurements to the BDS sea-based JPALS integrity monitoring.