摘要
针对GBAS地面系统的增强技术提出一种提高定位精度及完好性增强的改进算法。首先通过载波相位数据预处理,修正和去除周跳及残差,并引入无码载偏离平滑技术来解决电离层误差加剧问题,使平滑伪距的定位精度得到提高。在完好性方面,引入示警阈值辅助法,能够有效地避免较大偏差卫星伪距修正量的误差估计对接收机的整体剔除。在地面发射VDB报文前,验证了所发射伪距修正量的正确性。实验表明,新算法可有效减少电离层误差和较大伪距修正量误差对星基导航精密进近的精度影响。
An improved algorithm to enhance the position accuracy and integrity of GBAS ground system was put forw ard. The ionosphere＇s intensified error was reduced to solve and improve the positioning accuracy of the smooth pseudo range with the preprocessed carrier phase data by the algorithm revising and the cycle slip and residual error removed and then introducing the non code loading deviation smoothing technology. The entire elimination to the receiving machine because of the large deviation satellite pseudo range correction＇s error estimation was effectively avoided by introducing the warning threshold auxiliary method. The correctness of the launched pseudo range correction was verified before the ground launched a VDB message. The experiment show s that the new algorithm can effectively reduce the influence of ionosphere and large pseudo range correction＇s error on the satellite based navigation precision approach＇s accuracy.
出处
《沈阳工程学院学报（自然科学版）》
2016年第2期163-167,共5页
Journal of Shenyang Institute of Engineering:Natural Science
基金
国家自然科学基金(61401079
61151002
61151002)
中国航天科技集团公司卫星应用研究院创新基金(2014-CXJJ-TX-11)
