Evaluation of GPS precise positioning service autonomous integrity monitoring performance for military applications

The majority of research regarding Global Positioning System (GPS) integrity has focused on receiver autonomous integrity monitoring (RAIM) for commercial aircraft navigation, and is, consequently, restricted to measurements obtained from the standard positioning service (SPS). This paper examines the integrity issue from a military applications perspective. Analysis is conducted using GPS measurements from the precise positioning service (PPS) which provides data that are not corrupted by selected availability (SA) and are from direct Y-code correlation. For this investigation, it is assumed that the user has access to SA free measurement data. PPS autonomous integrity monitoring (AIM) was evaluated by investigating the ability of the least squares residual algorithm to improve the accuracy of the PPS solution and successfully detect and isolate a faulty satellite. The paper also explores the utility of employing additional sensors in the AIM process, such as inertial navigation systems or precise timing information that may be available in military applications