Estimate of the GPS block IIR AutoNav clock behavior

The GPS Block IIR and Block ITF satellites will have an on-board capability to estimate clock and ephemeris parameters autonomously; this capability is referred as Autonomous Navigation (AutoNav). In the AutoNav mode, each GPS satellite makes pseudorange measurements to other visible satellites. The measurements and other mission data are crosslinked to other GPS satellites. This paper presents the estimated behavior of the three AutoNav dock errors: (1) an individual AutoNav satellite clock estimated error which is the difference between the individual clock error and its estimation by the AutoNav, (2) the AutoNav ensemble clock error which is the average of all the individual AutoNav clock estimated errors, (3) the AutoNav clock residual or synchronization error which is the difference between the AutoNav clock estimated error and the AutoNav ensemble clock error.