GPS Carrier Tracking Research and Simulation

MATLAB/Simulink is a very efficiency tool to study algorithms on base band signal processing of high-dynamic Global Positioning System(GPS) receiver. The key performance of high-dynamic GPS receiver is realized by the technology of automatic frequency control (AFC) after taking carrier assistant code tracking loop. The paper took the signed cross-product and dot-product automatic frequency control(SCPDPAFC) to simulate the relation between tracking error, lock-loss probability and loop bandwidth, carrier noise ratio successfully after mainly studying three technologies on AFC of high-dynamic GPS receiver making use of Simulink to build high-dynamic module. The results indicated not only that SCPDPAFC has solved the problems that Cross-Product Automatic Frequency Control (CPAFC) is affected by sign bit and the frequency detecting range of Cross-Product and Dot-Product Automatic Frequency Control (CPDPAFC) could decrease to half, but this technology could be used under the high-dynamic condition with accelerator and changing rate of accelerator at 10 g and 10 g/s respectively.