Multi-Tech Systems CDMA Wireless Modem Position Determination Start Session +WPDSS , Position Determination End Session +WPDES

Chapter 13 – Position Determination (GPS) AT Commands
Multi-Tech Systems, Inc. CDMA Wireless AT Commands - PN S000294C 91
Position Determination Start Session +WPDSS
Description: This command starts the PD session to get position. Resulting data will come in as
unsolicited responses.
Values: <service>
“P” Position only
“PV” Position and Velocity
“PH” Position and Height
“PVH” Position, Velocity, and Height
<performance>
0: no time allowed for GPS search, use AFLT only.
1-255: upper bound of GPS search time in seconds, with 255 seconds the maximum
<accuracy>
Accuracy threshold in meters, used by MS-based only. If position uncertainty higher
than the threshold, PDE-calculated fixes will be try. The input can be between 1 to 255.
But, the reasonable range may be much smaller.
Syntax: Command syntax: AT+WPDSS=<service>,<performance>,<accuracy>
Command Possible Responses
AT+WPDSS=”PH”
Note: Start session for position and height
with no limit on GSP search time
OK
+CME: ERROR: tbd (PD session already active)
+CME: ERROR: tbd (modem offline)
AT+WPDSS=”PVH”,20,50
Note: Start session for position, velocity,
and height – requiring GSP search time
limited within 20 seconds, and aim for
accuracy within 50 meters
OK
+CMD: ERROR: tbd (tracking mode only)
+CMD: ERROR: tbd (tracking mode requires
+WPDFR setup)
+CME: ERROR: tbd (MS-based session only)
AT+WPDSS? +WPDSS=”PV” (“PV” session in progress)
OK
+WPDSS=”PH”,20,50 (said session in progress)
OK (no active PD session)
Position Determination End Session +WPDES
Description: This command ends the PD session to get position.
Syntax: Command syntax: AT+WPDES
Command Possible Responses
AT+WPDES
Note: End session
OK
+CME: ERROR: tbd (no active session)