1.在Looptest.c中利用星历计算卫星位置和速度，进而计算多普勒值。 2.与环路原有多普勒控制量对比。相差大约在286左右。-1. The Looptest. C ephemeris is used to calculate the satellite position and velocity, doppler values are calculated. 2. And original doppler loop control. Around 286.