Based on interferometry measurement theory of satellite carrier phase, the technology of land vehicle heading determination through Beidou Bi-Satellite System was studied.
基于卫星载波相位干涉测量原理，研究了利用北斗双星系统确定车辆航向的相关技术。
The theory's foundation of invalid administrative act system is the limited determination theory, and this institution is a challenge to the determination of administrative act.
无效行政行为制度存在的理论基础是有限公定力说，该制度的存在是对行政行为公定力的挑战。
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