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FIGURE 9.7 Position dilution of precision (PDOP) and the number of satellites observed (top left) and the corresponding three-dimensional standard deviation for GPS point positioning with range observation (top right); relative dilution of precision (RDOP) and the number of differential observations (bottom left) and the corresponding three-dimensional standard deviation for GPS relative positioning with carrier phase observations (bottom right).

(see Section 9.7.1.2). SA levels were set to zero on May 2, 2000, at 04:00 UT (Universal Time). For more information on GPS error sources, the reader is referred to Hofman-Wellenhof et al. (2001) and Lachapelle (1990).

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