NavCom Sapphire Rev.J - Manual (Page 215)

Sapphire Technical Reference Manual Rev. J
215
1.162 SELFSURVEY (ASCII)
SF-3050 Sapphire SF-3040
This command performs a self survey operation by averaging the GNSS receiver position over
time and then applying that averaged position as the reference station position. The command
supports the following parameters:
Command: [SELFSURVEY] {start, stop, quick-start, quick-survey, cancel}, time
Parameter Definition
start
Begins a survey for the specified time, and writes the results to the current surveyed
position in REFSTNPOS. The TIME keyword defaults to 1440 if not specified. The
survey continues for the specified time, or until the user enters STOP or CANCEL.
stop
Stops the self survey; if the user issues the STOP command before the survey time
has elapsed, the results will be saved to an internal location from which [REFSTNPOS]
draws its data. If the user issues the CANCEL command before the survey time has
elapsed, the results will be discarded.
quick-start
The QUICK-START command begins a survey for up to 86400 seconds (24 hours) and
automatically stops and writes after either of the following:

after 86400 seconds have passed

after the STOP command is entered only if it has collected four survey points; if
fewer than four have been collected, it will discard any results
The surveyed position will be applied at [REFSTNPOS].
quick-survey See second note, below.
cancel
Cancels the self survey in progress; if the user issues a [SELFSURVEY] CANCEL
command, any survey in progress is aborted and the receiver discards the surveyed
position without changing [REFSTNPOS] (no change to the reference station position
or base station table will occur).
time The length of the self-survey in minutes (1-10080); the default is 1440 (24 hours)
Default: 1440

The receiver waits for a period of time (nominally 3600 seconds) to allow the RTG
readings to “settle.” This means there will be no valid survey results until this time
has passed. However, if the user specifies less than this value as the time limit, the
survey will continue until complete.

QUICK-SURVEY is synonymous with QUICK-START. This command starts an
open-ended survey. Regardless of the solution quality, the survey runs for one day
or until the user enters the STOP or CANCEL command. The receiver generates its
best results when it has an hour to collect position fixes before it starts averaging
them to create a solution, and will continue to average data for an additional 24
hours. If the user specifies a runtime of less than an hour, the receiver will do its
best to average the current results until the time expires. The purpose of specifying
a runtime of less than an hour is to quickly diagnose a problem and is not typical.

After the self survey is completed, the user must save the current profile. If the
receiver reboots without saving the profile, the self survey position will be lost.