The precision of traditional GPS standard positioning is not satisfied, it is limited within 10-15 meters even though sa has been canceled.
传统的GPS标准定位精度并不高，在取消SA选择可用性之后为10 - 15米，这极大限制了中高等精度定位的应用。
SA error of GPS. Was identified systematically.
对GPS定位中的SA误差作了系统辨识。
SA error of GPS. Was identified systematically.
对GPS定位中的SA误差作了系统辨识。
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