High Dynamic Gps Receiver Acquisition And Tracking Algorithms

This thesis describes the characteristic of the GPS signal data, based on GPS receiver working in high dynamic. Since the key of the research of GPS receiver in high dynamic is the code acquisition and tracking, carrier acquisition and tracking, this thesis mostly researched acquisition and tracking algorithm of GPS receiver in high dynamic, and they also be simulated.Based on the study of GPS application feasibility in high dynamic circumstance, the different Doppler effect exerted on PRN code delay and carrier frequency when host vehicles executing severe maneuvers is studied. The paper proposes the method of the GPS signal acquisition, and the time domain correlation acquisition algorithm and FFT fast acquisition algorithm are described in detail, based on the characteristic of the signal in high dynamic. Several kinds of acquisition algorithm in high dynamic are compared, and verified by establishing simulation model, Since there are twelve channels in the correlator, the frequency segment acquisition algorithm is adopted when simulated on GPS receiver platform, so the time of the acquisition greatly reduced.In the field of code tracking algorithm, according to high dynamic environment, the code tracking algorithm which can separate carrier has been used, its performance in GPS has also been reseached, and a complicated system mode has been founded by Matlab. In the field of carrier tracking algorithm, PLL has been researched detailedly, and Cross Product Automatic Frequency Control (CPAFC), Kalman filter and Digital Phase Locked Loop (DPLL) have also been discussed. At last, the carrier tracking algorithm of PLL and FLL being combined is adopted, and is stimulated by Matlab. The acquisition and tracking algorithm which has been confirmed is programmed and transplanted into the receiver R&D platform.