Mask Controls

The Mask Controls page allows entry of two unrelated control settings that affect the operation of the GPS receiver.

Elevation Mask

The Elevation Mask controls which satellites will be tracked based on their elevation (in degrees) above the horizon. Satellites below the Elevation Mask value will not be tracked.

The Elevation Mask can be specified to any value in the range -10 degrees to +90 degrees. The default value is zero degrees. Negative masks are appropriate when operating from very high elevation platforms such as aircraft.

PDOP Mask

The PDOP mask controls the conditions under which the NetRS will calculate a position, based on the current geometric arrangement of the GPS satellites. PDOP (Position Dilution of Precision) is a ratio that indicates how sensitive the calculated position solution is to errors in the GPS range measurements. High PDOP values usually imply lower quality position solutions. When the currently available satellites indicate a high PDOP, then position calculations will be suspended until the satellite geometry improves. Note that the PDOP mask only affects the calculation of position solutions. It does not affect the logging or streaming of raw GPS measurements.

The PDOP mask can be set to any value between 0 and 99. The default value is 7.

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