The main problems in GPS technology including the system bias to SLR, its own annual variety and the change of GPS satellite antenna phase center are also discussed.
评述了GPS技术目前存在的问题，包括与SLR测量之间存在的系统偏差、GPS技术本身可能存在的周年变化和GPS卫星天线相位中心的变化。
The outputs of simulation show that the real time error correction due to GPS antenna phase center movement is needed in order to acquire precision GPS observables.
计算机模拟表明，要获得准确GPS观测量来进行导航定位，必须进行天线相位中心引起误差的校正。
The RADIONOVA M10478 RF Antenna Module is an ultra-compact single package that combines the RF and antenna on the same module for both L1-band GPS and Assisted-GPS systems.
该RADIONOVA M10478射频天线模块是为L1波段GPS和辅助GPS系统相同的模块上的射频和天线结合了超小型单封装。
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