On“GPS Weeknumber Rollover”;

A study of orbit determination methods using undifferenced dual-frequency onboard GPS P codes;

Study and Software Implementation of GPS Data Pre-processing and Onboard GPS Kinematic Orbit Determination;

Based on the geometric, dynamic and reduced dynamic precise orbit determination (POD), a kinematic POD by the onboard GPS zero-differential phase observations was discussed and programmed.

Federated Least Square Filtering Fault-Tolerance Design on INS/DS/GPS Integrated Navigation System;

As the GPS signal travels from the GPS satellite to the receiver, it propagates through the atmosphere of the earth, where it is retarded and its path changed from a straight line to a curved one.

In comparison with the simple homogeneous function form of Geiger and Santerre, a precise sky distribution density function of GPS satellites related to the station latitude and to the inclination of satelliteis studied.

The preliminary results of residual analysis are shown,and it is pointed out that the present sparse laser ranging data of GPS satellites are very valuable for precise orbit determination of the satellites and station coordinate solution.

The location control principle of time delay pseudo GPS satellites jamming is discussed through the time difference location equation.