SNR (Signal to Noise Ratio) Mask: (higher is better, stronger signal) Filters out signals with excessive noise, using only those satellites with low noise (more accurate). Also, with Differential Correction, insures that all satellites used are visible to base station as well as the field receiver. The lower on the horizon a satellite is the more atmosphere the signal must pass through, thus the greater the potential for signal diffraction (inaccurate estimations of time/distance), as well as greater chance of multi-path errors. , 4 satellites with good precision, or 6 with reasonable precision, or 8 with average precision) Elevation Mask: Sets minimum elevation above horizon for satellites to be used.
Typically considers both quantity and quality of satellites (e.
Masks: PDOP, Elevation, SNR Ability to control the quality of the data accepted at the time of data collection (unacceptable readings are filtered out) PDOP Mask: Allows the recording of positions only when there is acceptable satellite geometry.
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