NavCom Sapphire Rev.J - Manual (Page 189)

Sapphire Technical Reference Manual Rev. J
189
1.133 PRDGPSMODE (ASCII)
SF-3050 Sapphire SF-3040
This command is used to enable or disable the use of dGPS, code-base (pseudorange)
corrections from specific sources.
Command: [PRDGPSMODE] dGPS_mode, on_off, SF_Source
Parameter Definition
dGPS_mode
Keyword which specifies the code-based, dGPS mode or source of corrections to be
enabled or disabled. Table 77 defines the keywords and their associated dGPS mode.
on_off Keyword to enable (ON) or disable (OFF) dGPS mode
SF_Source
Keyword to select which StarFire source to use. See Table 78 for more information.
This source only works with SFRTG.
Defaults: All code-based differential modes are defaulted to ON.
SF_Source is defaulted to INTERNAL.
Table 77: Code-Based dGPS Modes Controlled by the PRDGPSMODE Command
Keyword Mnemonic Code-based (pseudorange) Navigation Mode
Default Correction
Timeout (sec)
ALL Used to specify all code-based dGPS modes
RTCM1 RTCM type 1 or 9 pseudorange corrections 300
WAASEGNOS WAAS or EGNOS SBAS systems 300
SFRTG StarFire ™ 1200
Table 78: SF_Source Controlled by the PRDGPSMODE Command (SFRTG Only)
Keyword Mnemonic Description
INTERNAL Default – Uses SF corrections from Over The Air ONLY
EXTERNAL Uses SF corrections from Serial/Eth ports ONLY

Enabling a specific differential navigation mode is necessary to allow that mode to
be executed, but it is not sufficient for its operation. The receiver must also be
licensed to use that mode, a source of dGPS corrections for the enabled mode
must be available, and the mode must be the highest precedence dGPS mode
currently available.
Examples: [PRDGPSMODE] WAASEGNOS, OFF
Disables navigation using dGPS corrections from WAAS, EGNOS, or MSAS