Chapter 1 Getting Started
Using Commands to Control Key Functions (Examples)
1-22 Getting Started Guide
Initiate “surveying”, an automatic determination of the
Receiver’s antenna position.
When “position survey” is invoked, the Receiver is set to ascertain the
position of its antenna automatically. This survey is important; correct
antenna position data is required for the Receiver to deliver specified
performance.
The Receiver uses data from orbiting satellites to survey; hence, the
antenna must be installed and operational for the survey to work.
However, if you have a limited view of the sky, you can complete basic
installation, then read forward to the section titled “To Install With a
Limited View of the Sky, To Bypass Position Survey Operation” on
page 1-23 for a means of overriding the survey operation and entering
position data directly.
The survey is an iterative process. The Receiver transits to “Position
Hold” after it has suitably refined its position estimate.
Set the Receiver to survey using command:
:GPS:POSITION:SURVEY ONCE
Set the Receiver’s to compensate for the length of the
antenna cable.
The Receiver can be custom-configured to compensate for the length of
the antenna cable. The phase of the Receiver’s internal clock is offset
by the value you enter with this command. The amount of error is
typically on the order of a few hundred nanoseconds. Should you decide
to correct for this error, tables 2-1 and 2-2 in Chapter 2, “Features and
Functions,” of this guide provides typical corrections for standard
antenna cable lengths.
Set the Receiver to compensate for antenna cable delay using the
command:
:GPS:REFERENCE:ADELAY <seconds>
It is normal to observe that the Receiver momentarily goes into
holdover after any change in antenna delay.
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