New techniques for multi-mode satellite navigation receiver

Multi-mode satellite navigation receivers have to endure heavier computation load because of huge increment of visible satellites, in hybrid GPS, GLONASS, Galileo and Compass navigation scenario. To solve these problems, in the paper, two new technologies are presented to decrease computation load: Fast satellite selection algorithm (FSS) and Novel weighted least-squared positioning algorithm (NWLS). Different with conventional methods, FSS is based on satellite elevation and azimuth. Firstly, all visible satellites are classified by elevation, with three sections: low, medium and high elevation. Then, parts of satellites in medium elevation section are excluded through sorting, differencing, and ratio of high elevation satellites and low elevation satellites. As to NWLS positioning algorithm, ionosphere delay and other error are analyzed separately firstly; then weighted observation matrix is created according to two kinds error and satellite position. The matrix is employed in receiver position calculation. With satisfied positioning accuracy, FSS algorithm is able to decrease computation load by about 20-30%. In conclusion, FSS and NWLS algorithm are efficient and effective to decrease load of receiver; they are proper to integrated satellite navigation application scenario.