NavCom StarUtil-3000 Rev.A - Manual (Page 91)

StarUtil-3000 User Guide – Rev A
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[NAVELEVMASK]
This command sets the lowest elevation, in degrees, at which a receiver uses a satellite in the
navigation solution. Measured from the horizon to zenith, 0º to 90º.
 Base: The recommended setting for the base receiver is 5 degrees, [NAVELEVMASK]5.00.
However, the height of on-site obstructions will dictate this setting. Collecting poor data (i.e.
through trees) at the base will degrade the performance of the rover. For any satellites
below the angle set for the base, no data will be transmitted to the rover for use in
calculating positions.
 Rover: The recommended setting for the rover receiver is 7 degrees, [NAVELEVMASK]7.00,
to prevent position jumps due to frequent satellite re-acquisitions at lower elevation mask
angle limits.

As a general rule, NavCom recommends that the rover mask be set 2 degrees
higher than the base mask. This allows for better filter performance.
[NAVMEASUSE]
This command is used to enable or disable the receiver’s use of various signals or frequencies
for navigation. Refer to Chapter 6/
Typical Commands And Parameters In User Profiles for more
information.
[PDOPLIMIT]
This command sets the maximum Position Dilution Of Precision (PDOP) allowed for a valid
navigation solution. Refer to Chapter 6/
Typical Commands And Parameters In User Profiles for
more information.
[PRDGPSMODE]
This command enables or disables the use of dGPS, code-base (pseudorange) corrections from
specific sources.
[PRDGPSTIMEOUT]
This command sets the dGPS correction timeout (age limit) for specific code-based
(pseudorange) differential GPS navigation modes. When communication with the base station is
lost, the last set of corrections received will continue to be used until this time limit is reached. At
this point, operation in dGPS mode will cease until a new set of corrections is received.
The max dGPS age limit is 1200 seconds. The default is 300 seconds for SBAS (WAAS,
EGNOS, MSAS, GAGAN) and RTCM type 1, 9, and 31. The default is 1200 seconds for RTG
(StarFire).

Input the [PRDGPSTIMEOUT] command via the Input Terminal window.
[PRDGPSMODE]RTCM1,ON
[PRDGPSMODE]WAASEGNOS,ON
[PRDGPSMODE]SFRTG,ON
[PRDGPSTIMEOUT]RTCM1,300
[PRDGPSTIMEOUT]WAASEGNOS,300
[PRDGPSTIMEOUT]SFRTG,1200
Figure 111: Example Settings: [PRDGPSMODE] and [PRDGPSTIMEOUT]