GPS absolute positioning: absolute positioning is also known as the single point positioning, this is a kind of using a receiver to locate mode, it is determined by its absolute coordinates of the receiver antenna,
Relative positioning: put two receiver respectively in the two endpoints of the baseline, its location, stillness and synchronous observation of the same four or more GPS satellites, determine the baseline two endpoints relative position in the agreement the earth coordinate system, the positioning model called relative positioning,
This course focus on relative positioning, high precision GPS control network belongs to the relative positioning,

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