对单个历元的双差载波相位观测方程进行零空间变换，避免了实时变化的三维位置参数求解；
It transforms the double-differential carrier observation equation using null space transformation so that it need not to resolve real-time three-dimensional position parameters.
并根据GPS卫星广播星历求取卫星任意历元的位置、速度、加速度以及加速度的变化率，仿真出GPS卫星运行轨道。
Secondly, the GPS satellite circulating orbit is simulated, according to the position, speed, acceleration and the rate action factor of acceleration, given by GPS satellite broadcast star calendar.
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