多参考地基增强系统电离层梯度完好性监测方法  

Multi reference-based integrity monitoring of ionospheric gradient for ground based augmentation system

作　　者：程建华 李家祥 李亮[1] 姜超 齐兵[1] CHENG Jianhua;LI Jiaxiang;LI Liang;JIANG Chao;QI Bing(College of Intelligent Systems Science and Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]哈尔滨工程大学智能科学与工程学院,哈尔滨150001

出　　处：《中国惯性技术学报》2021年第4期467-474,共8页Journal of Chinese Inertial Technology

基　　金：国家自然科学基金(62073093,61633008,61773132,61803115);黑龙江省优秀青年研究基金(YQ2020F009);黑龙江省杰出青年研究基金(JC2018019);中央高校基础研究基金(3072019CF0401,3072020CFJ0402,3072020CFT0403)。

摘　　要：卫星导航增强系统服务于与生命安全相关应用时,电离层梯度异常是所需监测的重要风险源。针对传统地基增强系统(GBAS)电离层梯度监测算法受电离层梯度异常与整周模糊度固定失败双重风险源影响问题,提出基于多参考接收机布设的GBAS电离层梯度异常监测方法,通过电离层无关整周模糊度快速固定构建高精度检测统计量,实现误警和漏检错误的同步控制。使用电离层梯度异常GNSS真实数据对所提方法进行验证,结果表明300历元平滑长度下,基于多参考接收机布设的电离层梯度异常监测方法在10^(-6)漏检率约束下成功监测到477 mm/km电离层梯度,验证了所提方法可用于电离层梯度异常的实时监测。Ionospheric gradient anomaly is a critical risk to be monitored by ground-based augmentation system for safety-of-life applications.Since the traditional ionospheric gradient monitoring method is affected by the dual risk sources of gradient anomaly and ambiguity resolution failure,the multi reference-based ionospheric gradient monitoring method is proposed.The high precision test statistic for ionospheric gradient monitoring is constructed by ionosphere free ambiguity resolution.The false alarm and missed detection errors of the proposed ionospheric gradient monitoring method are constrained simultaneously.The real GNSS data with ionospheric gradient anomaly are utilized to test the proposed algorithm.The experimental results show that the 477 mm/km ionospheric gradient anomaly can be successfully monitored with the constraints of 10^(-6) missed detection by multi reference-based ionospheric gradient monitor under the smooth length of 300 epochs,which prove that the proposed method can realize real-time monitoring of ionospheric gradient anomaly.

关 键 词：地基增强系统 电离层梯度异常 完好性 模糊度 北斗 载波相位 

分 类 号：V249.324[航空宇航科学与技术—飞行器设计]