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The Precision Measured Method for GPS Engineering Control Network

Niu Zhuoli (Xian Investigation Institute of China National Nonferrous Metals Industry, Xian, 710054)  
In this paper, a formula is proposed to calculate the total mean square error of GPS horizontal network by circuit closures of coordinate components. At the same time, a simplified formula to calculate the circuit closures of horizontal coordinate of earth-centered, earth fixed (ECEF) coordinate is also given, then the total mean square errors of GPS horizontal network at various levels are calculated according to "Engineering Surveying Specification" (Nation standard).
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