Research on Satellite Selection Strategy for Receiver Autonomous Integrity Monitoring Applications

Abstract

Satellite selection is an effective way to overcome the challenges for the processing capability and channel limitation of the receivers due to superabundant satellites in view. The satellite selection strategies have been widely investigated to construct the subset with high accuracy but deserve further studies when applied to safety-critical applications such as the receiver autonomous integrity monitoring (RAIM) technique. In this study, the impacts of subset size on the accuracy and integrity of the subset and computation load are analyzed at first to confirm the importance of the satellite selection strategy for the RAIM process. Then the integrated performance impact of a single satellite on the current subset is evaluated according to the performance requirement of the flight phase. Subsequently, a performance-requirement-driven fast satellite selection algorithm is proposed based on the impact evaluation to construct a relatively small subset that satisfies the accuracy and integrity requirements. Comparison simulations show that the proposed algorithm can keep similar accuracy and better integrity performances than the geometric algorithm and the downdate algorithm when the subset size is fixed to 12, and can achieve an average 1.0 to 2.0 satellites smaller subset in the Lateral Navigation (LNAV) and approach procedures with vertical guidance (APV-I) horizontal requirement trial. Thus, it is suitable for real-time RAIM applications and low-cost navigation devices.

Time–Frequency Signal Integrity Monitoring Algorithm Based on Temperature Compensation Frequency Bias Combination Model

“…RAIM enables GNSS receivers to autonomously detect and rectify errors using redundant GNSS data. Scholars are presently delving into its methodological principles and performance analyses [5][6][7][8], availability and integrity risk assessment [9][10][11], GNSS satellite selection strategy [12], scenarios involving multiple constellations and faults [8,[13][14][15], cross-integration with other disciplines [16], and applications in aviation, Precise Point Positioning (PPP), Real-Time Kinematics (RTK), and other fields [17][18][19][20][21][22]. In response to the integrity monitoring requirements of timing receivers with precisely known, stationary antenna coordinates, a Timing-Receiver Autonomous Integrity Monitoring (T-RAIM) algorithm has been proposed [23][24][25].…”

Signal Occlusion-Resistant Satellite Selection for Global Navigation Applications Using Large-Scale LEO Constellations

“…Simultaneously, research endeavors focused on incorporating additional parameters, such as Receiver Autonomous Integrity Monitoring (RAIM) [30][31][32] and a Weighted Geometric Dilution of Precision (WGDOP) system [33,34], among other considerations [35][36][37][38], are also on the rise.…”