修正相位缠绕误差的机载电离层异常监测方法  

Airborne ionospheric anomaly monitoring method with phase wind-up error correction

作　　者：赵琳[1] 贺崟 贾春 庞志超 李阳[1] ZHAO Lin;HE Yin;JIA Chun;PANG Zhichao;LI Yang(College of Intelligent Systems Science and Engineering,Harbin Engineering University,Harbin 150001,China;Tianjin Navigation Instrument Research Institute,Tianjin 300130,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 [2]天津航海仪器研究所,天津300130

出　　处：《中国惯性技术学报》2025年第2期205-212,共8页Journal of Chinese Inertial Technology

基　　金：国家重点研发计划项目(2021YFB3901300);国家自然科学基金(62403158,62373117);中国博士后科学基金(2024M754152);黑龙江省省重点研发计划项目(创新基地)(JD2023SJ09)。

摘　　要：电离层异常是地基增强系统服务航空用户需要监测的重要风险源之一。传统机载码-载波偏离度(CCD)电离层异常监测方法需要低通滤波器平滑伪距噪声,这导致算法存在异常探测能力弱且响应时间长等问题。基于此,提出了一种基于修正相位缠绕误差的频间差分模型以监测电离层异常的方法。利用双频载波相位进行站间、频间和历元间的差分,以构建检测统计量,并针对检测统计量中残留的相位缠绕误差,构建了基于载波相位时间差分测速的修正模型。为验证所提方法的性能,在实测动态机载GNSS数据中加入两类典型电离层异常情况进行仿真测试。与CCD方法相比,所提方法能够实时反映机载电离层延迟误差的变化情况。针对Ⅰ型异常,具备与传统CCD方法相当的监测能力;针对Ⅱ型异常,可检测异常幅值降低76%,对幅值为5 m的Ⅱ型异常,响应时间缩短24%。The ionospheric anomaly is a crucial factor that needs to be monitored when the ground-based augmentation system(GBAS)services airborne users.The traditional airborne code-carrier divergence(CCD)method for monitoring ionospheric anomalies requires a low-pass filter to smooth the pseudo-range noise,which leads to problems such as weak ability in abnormal detection and long response time.Herein,a monitoring method based on the inter-frequency difference model with phase wind-up error correction is proposed.The method utilizes inter-station,inter-frequency,and inter-epoch difference operations by dual frequency carrier phase to form the test statistic,and for the residual phase wind-up error in the test statistic,a correction model by the velocity estimation approach based on time differenced carrier phase(TDCP)is established.In the real-world airborne GNSS data,two types of typical ionospheric anomalies are simulated to test the performance of the proposed method.Compared to the CCD method,it is shown that the proposed method can reflect the real-time changes of airborne ionospheric delay error.For ionospheric anomalies typeⅠ,the performance of the proposed method is consistent with the traditional CCD method.For ionospheric anomalies typeⅡ,the detectable abnormal amplitude is reduced by 76%,and the response time is shortened by 24%for ionospheric anomalies typeⅡwith an amplitude of 5 m.

关 键 词：卫星导航系统 地基增强系统 电离层异常 相位缠绕 频间差分 

分 类 号：V249.324[航空宇航科学与技术—飞行器设计]