Acquisition Algorithms for GPS Software Receiver with Tightly Coupled Integration
Rongbing Li · Journal of Projectiles.Rockets.Missiles and Guidance · 2009
In research of the basic acquisition algorithms for GPS software receiver,an advanced algorithm which uses tightly coupled integration is presented.The new algorithm use information of other navigation systems to help acquiring GPS signals,in which way the speed of acquisition is improved.The new algorithm is based on the theory of frequency correlation.In the new algorithm,the length of the C/A code samples for acquisition is shorten with the help of information of pseudorange;the range of the carrier wave frequency is reduced with the help of information of Doppler shift;the amount of correlation operations is decreased after cutting of useless frequency information.The feasibility of the new algorithm is proved by the emulation with Matlab.The emulation also shows that the new algorithm has obviously advantage on the speed of acquisition as well as the algorithm efficiency compared with the basic algorithm.