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Chapter 2 TL1 Reference
Retrieve GPS Position
Retrieve GPS Position
This command returns the settings for the GPS Input module designated by the aid.
Syntax
RTRV-GPS-POS:[tid]:[aid]:ctag;
Parameter
[aid]
Response Format
If the GPS engine has not yet established a position, the response includes the "No
Valid Position Information" message. Otherwise, the format is:
^^^"aid:lat,lon,hgt,pdop,mode,avg,posel,timel" <cr lf>
where:
= module access identifier
aid
= current latitude of the receiver in the format (DD)-MM-SS:SS
lat
= current longitude of the receiver in the format (DD)-MM-SS.SS
lon
= current height of the receiver in meters
hgt
= current Position Dilution of Precision or pdop mask [1 through 10]. Pdop
pdop
is a measurement that indicates the geometry of the GPS satellites that the
SSU-2000 is tracking. Lower values indicate better geometry.
= GPS positioning mode is user-specified or calculated: [User|Calc]. If the
mode
positioning mode is set to User, the configuration setting is sent to the GPS
engine and the mode is set to a fixed position. When the positioning mode is set
to Calc, the elevation mask setting for positioning is sent to the engine, the
engine is set to positioning mode, and 10 positions are averaged and compared
to the configuration setting. If there is a greater than 300 meter error, the unit
recalculates the position based on the averaging count. If there is no such error,
the unit uses the stored position. The SSU-2000 generates an event when the
GPS module calculates a new position, and stores the new position in NVRAM
as the current position and changes the engine mode to fixed position.
= current GPS position averaging count. Setting the averaging count
avg
generates an event and starts a new position fix automatically.
= minimum satellite elevation to use for positioning
posel
= the minimum satellite elevation to use for timing
timel
Example
SSU_2000 05-03-08 15:37:53
M
1 COMPLD
"S1A03:(+30:28:08.03),(-097:40:34.05),(254.23),(3.9),CALC,300,5,10"
;
70
SSU-2000 Technical Reference
Value
Retrieves the GPS data from the specified GPS Input
S1A3|S1A5
module.
Description
12713020-003-2 Revision F.01 – January 2007
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