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A-3
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g External Devices
back to the receiver. During post-processing, the interpolated positions Reliance
Processor does not interpret the NMEA output messages. After post-processing, the
time tags, positions, and NMEA string are exported to an *.ESD file in ASCII format.
The external sensor device must output messages at a 1 Hz rate or slower in order for
FAMlog to properly time tag the message. The output message must be less than 256
characters.
Planning
As with conventional GPS surveying, external sensor devices have their own
characteristics and error sources. Be sure to plan how the error sources of the external
sensor device you use affect the surveying process. Generally most external sensor
devices measure an additional characteristic about a survey point, hence Reliance
Processor does not account for offsets when using an external sensor device. The field
operative must survey the actual feature.
If you plan to use an external sensor device while surveying a line or area feature
while dynamic, it is important to consider the velocity while surveying and the GPS
recording interval. Reliance Processor uses these two, GPS time and change of
position between recording intervals, to interpolate a position corresponding to a time
tag. As a field operative deviates from a straight course, the induced error changes.
For example, Figure A.1, which may follow a lake shore, outlines a possible course
where the numbers (1,2,3,4) correspond to recorded positions at a given time
interval.The letters (A, B, C) represent actual positions where sensor data was
collected. After processing the data, Reliance interpolates the sensor data position for
points A and C correctly, however incorrectly interpolates a position corresponding to
point B at the X.
Figure A.1: External Sensor Interpolated Positions
Содержание Reliance FS/2
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