What is the difference between AGPS and DGPS?

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What is the difference between AGPS and DGPS? [Copy link]

AGPS is the positioning function of the mobile communication system, which was first implemented in the CDMA system. Since the CDMA system requires a strict synchronous clock, the clock source comes from GPS, and the location of the base station is known, high-precision positioning can be achieved. However, this technology cannot achieve large-scale mobile high-precision positioning, and is limited to fixed-point or low-speed mobile positioning near the base station.

DGPS is the so-called dual-channel GPS positioning technology, which requires two independent GPS systems for matching operations. However, the accuracy of DGPS is also limited, far from the military 1-meter accuracy, which is an order of magnitude lower.

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AGPS is mainly used to shorten the first positioning time, or use a highly sensitive module for rapid positioning when the signal is weak. DGPS is mainly used to improve positioning accuracy. Pseudo-range differential can achieve m-level accuracy, and carrier phase differential can achieve mm or cm-level accuracy. Let's discuss more. MSN: snow_lee22@hotmail.com QQ:104442335