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

Chapter 13 – Position Determination (GPS) AT Commands

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”	OK
	Note: Start session for position and height	+CME: ERROR: tbd (PD session already active)
	with no limit on GSP search time	+CME: ERROR: tbd (modem offline)
	AT+WPDSS=”PVH”,20,50	OK
	Note: Start session for position, velocity,	+CMD: ERROR: tbd (tracking mode only)
	and height – requiring GSP search time	+CMD: ERROR: tbd (tracking mode requires
	limited within 20 seconds, and aim for	+WPDFR setup)
	accuracy within 50 meters	+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	OK
	Note: End session	+CME: ERROR: tbd (no active session)

Multi-Tech Systems, Inc. CDMA Wireless AT Commands - PN S000294C 91