RAIM Filter for Fast Failure Detection

W.C. Yang, F.R. Chang, C.H. Fan and H.S. Wang

Abstract:	The safety is, first and foremost, an issue in aviation navigation. Therefore, the GPS receivers must possess functions of integrity, the ability of the system to provide timely warning to users when the system is failure. Because the aircraft travels at high speeds, fast fault detection plays an important role in Receiver Autonomous Integrity Monitoring (RAIM). In this paper, a RAIM filter for fast failure detection is introduced. The conventional RAIM adopts a idsnapshotll technique, which uses current redundant ranging measurements to perform a consistency check. On the contrary, the proposed filter, which aggregates the present as well as the past sums of squared pseudorange residues for failure detection, can be described as a ismoving pictureld approach. The output data of this filter is compared with the threshold associated with a given false alarm rate. Since our method accumulates more information than the traditional one does, the fast failure detection performance is expected. According to RTCA DO-208, some simulations are given to verify the performance of the proposed filter. Under the same false alarm rate, our method can achieve the goal of fast satellite failure detection. From the simulation results, it can be seen that the suggested method reduces fault detection time by up to 20% in comparison with existing methods.
Published in:	Proceedings of the 2001 National Technical Meeting of The Institute of Navigation January 22 - 24, 2001 Westin Long Beach Hotel Long Beach, CA
Pages:	144 - 150
Cite this article:	Yang, W.C., Chang, F.R., Fan, C.H., Wang, H.S., "RAIM Filter for Fast Failure Detection," Proceedings of the 2001 National Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2001, pp. 144-150.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In