All-Digital GPS Signal Simulating and Processing Techniques for High Dynamic Movement

This paper demonstrates an Immediate Frequency (IF) GPS signal simulator design scheme and some signal synchronize techniques on high dynamic environment. It is based on a mathematical signal model which expresses the digitized IF GPS signal as a function of various errors during propagation. The simulator is able to simulate more than 12 GPS satellite signals carrier’s high dynamic movement. In order to validate the signals and develop more effective algorithm for high dynamic movement of a vehicle, signal acquisition and tracking techniques are discussed. Performances of different type tracking loops on particular environment are demonstrated and analyzed. Especially, aiming at tracking carrier’s high dynamic movement perfectly, a tracking scheme for errors based on Extended Kalman Filtering (EKF) is designed and implemented.