程序1主要使用矩阵模拟GPS 24卫星的位置，并计算出多颗卫星的伪距和时差差分方程。 方案2主要模拟GPS卫星，包括卫星轨道，运动卫星。 程序3通过计算近点角度，近点角度和接近角度角度来模拟卫星的定位。-Program 1 mainly uses the matrix to simulate the position of GPS 24 satellite, and calculate the pseudorange and clock difference equations of multiple satellites. Program 2 mainly emulates GPS satellites, including satellite orbits, motion satellites. Program 3 simulates the positioning of the satellite by calculating the near-point angle, the near-point angle and the approach point angle.