Optimal Code and Carrier Tracking LoopDesign for Galileo BOC(1,1)

摘要

In this paper we deal with the Galileo BOC(1,1) signalrntracking loop optimization. It is shown that thernDLL/PLL/FLL design can be shown as an optimalrncontroller design problem. A state space model is derivedrnfor Galileo signal tracking problem. Based on this arncombined DLL/PLL/FLL is design by use of the LinearrnQuadratic Gaussian (LQG) optimal control theory. The LQG loop filter is a regulator. It derives the totalrncode and phase tracking errors as small as possible andrnresults in the minimum mean squared error controlrnperformance. Therefore we can optimally design arncombined receiver loop filters for code, carrier, andrnfrequency tracking. This could results in an improvedrntracking performance over the conventionally, separatelyrnand independently designed tracking loops.rnThe designed tracking loops are applied to real GalileornBOC(1,1) signal received from the GIOVE-A satellite.rnSignal processing results showed improved trackingrnperformance of the LQG based tracking loops over thernconventional approach.