This paper deals with the comparative performance analysis of the GPS receiver according to the bandwidths of a FLL-assisted-PLL loop filter in random vibration environment. The operation results of the GPS receiver exposed in the stepwise increasing random vibration from 6grms to 20grms were analyzed in various aspects of the signal tracking performance and signal to noise ratio as well as the navigation accuracy according to the FLL and PLL loop filters with 4 different types of bandwidths, respectively.

Keywords: GPS, carrier tracking loop, FLL-assisted-PLL, loop filter, vibration