NavCom Sapphire Rev.J - Manual (Page 201)

Sapphire Technical Reference Manual Rev. J
201
Examples:
[RTGQUICKSTART] START, 33, 50, 28.5506, -118, 20, 37.4839, 9.03
OR
RTGQUICKSTART] START, 33, 50, 28.5506, -118, 20, 37.4839, 9.03, ITRF
Sets RTG QuickStart position to latitude North 33’50”28.5506, longitude West
118’20”37.4839, height 9.03 meters in the latest ITRF datum used by the receiver,
currently at 2008.
[RTGQUICKSTART] START, 33, 50, 28.5506, -118, 20, 37.4839, 9.03, WGS84
Sets RTG QuickStart position to latitude North 33’50”28.5506, longitude West
118’20”37.4839, height 9.03 meters in the WGS84 format, which will then get
converted to the latest ITRF datum format.

The QuickStart process requires 50 seconds to complete. The status of the
QuickStart process is available in the response when the command is input with no
argument. The format of the response is as follows:
[RTG QUICKSTART] mode, total_time, current_time, lat, lon, ht
mode quick start mode described in Table 81
total_time total time required for quick start (seconds)
current_time the length of time that quick start has running (seconds)
lat latitude in degrees
lon longitude in degrees
ht ellipsoidal height in meters
Table 81: [RTGQUICKSTART] QuickStart Mode in Response
Mode Description
0 Idle
1 QuickStart initiated
2 QuickStart in progress
3 QuickStart completed
4 QuickStart failed due to nav proximity

The QuickStart position should be accurate to better than 30 cm; however, best
performance is achieved from a previously fully converged position (i.e., 7 cm), and is
referenced to ITRF2008. For StarFire GNSS, ITRF2005 was transitioned to ITRF2008 on
6 Dec 2011. For optimal performance, use ITRF2008 to initiate QuickStart. StarFire GPS
continues to operate ITRF2005.
Depending on how accurate the QuickStart position is, there will be some residual drift, or
pull-in, as the solution converges. A gross check on the QuickStart position is made before
the process is initiated. If the gross check is different from the current navigation position
by more than 25 meters, QuickStart aborts and QuickStart status reports FAILED.
Any error biases contained in the input position cause the output to be biased by an equal
amount, plus any error in the StarFire

RTG navigation solution. For example, an error of
25 centimeters in the input position plus a 7 centimeter error in the RTG navigation
solution, biases the output by 32 centimeters.