네트워크 RTK 무결성 감시를 위한 위성 이상 검출 기법

Abstract

This paper presents and evaluates the anomaly satellite detection technique to isolate the abnormal signal caused by the anomaly satellite from the acquired signals in the receiver of multiple-reference stations. This technique is aimed the abnormal status of satellite cause the performance degradation on network RTK. The anomaly satellite detection technique performs fault detection by the parity space method using residual measurements of the carrier smoothed code and the carrier phase, and identifies the anomaly satellite, and then isolates the abnormal measurements by the anomaly satellite on each single epoch. Especially the proposed algorithm could solve the issues of integer ambiguity searching, the multiple satellite faults and real-time processing through the structural supplement in the previous parity space method that this method was routinely used on RAIM. For the threshold computation on the proposed fault detection algorithm, the characteristics of the test statistics distribution are analyzed on real environment. The proposed anomaly satellite detection technique is verified on the fault-free ideal case, the simulated error scenario modeled real fault case. abnormal status of satellite cause the performance degradation on network RTK. The anomaly satellite detection technique performs fault detection by the parity space method using residual measurements of the carrier smoothed code and the carrier phase, and identifies the anomaly satellite, and then isolates the abnormal measurements by the anomaly satellite on each single epoch. Especially the proposed algorithm could solve the issues of integer ambiguity searching, the multiple satellite faults and real-time processing through the structural supplement in the previous parity space method that this method was routinely used on RAIM. For the threshold computation on the proposed fault detection algorithm, the characteristics of the test statistics distribution are analyzed on real environment. The proposed anomaly satellite detection technique is verified on the fault-free ideal case, the simulated error scenario modeled real fault case.