Chapter 20 – Unsolicited AT Result Codes

Multi-Tech Systems, Inc. CDMA AT Commands Reference Guide (PN S000294K) 165

Position Determination Start Session Result +1

Description: This unsolicited response is used by the gpsOne feature to return position determination data. The content

of this response is dependent on the services specified in the +WPDSS command.

Syntax: Response Syntax: +WPDSS: <latitude>,<longitude>,<timestamp>,<position uncertainty angle>, <axis

uncertainty>,<perpendicular axis uncertainty>,<fix>,<mask>, <elevation>,<elevation

uncertainty>,<heading>,<horizontal velocity>, <vertical velocity>

Response Syntax: +WPDSS:GPS Session Failed

Command Possible responses

AT+WPDSS=”P”

Note: Ask for position only.

+WPDSS:#,#,#,#,#,#,0,0,#,#,#,#,#

Note: Unsolicited result with position only.

AT+WPDSS=”PH”

Note: Ask for position and elevation.

+WPDSS:#,#,#,#,#,#,0,1,#,#,#,#,#

Note: Unsolicited result with position and elevation.

. +WPDSS:GPS Session Failed

+WPDER:15

Note: gpsONE session failure.

Defined values:

<latitude> 32-bit signed integer.

This value represents the position North (positive) or South (negative) of the equator. The

returned value must be divided by 186413.5111 to convert it to degrees.

32-bit signed integer

This value represents the position East (positive) or West (negative) of the Greenwich

meridian. The returned value must be divided by 186413.5111 to convert it to degrees.

<timestamp> 64-bit integer

This value is the CDMA system time for the reported position data.

4-bit integer

This value is the number of 5.625 degrees increments. The range is from 0 to 15 (84.375

degrees). A value of 0 is true north and the angle increases toward the east.

<axis uncertainty> 8-bit integer

This is the uncertainty value for the axis along the Position Uncertainty Angle. The value

returned is a table lookup key that corresponds to the actual uncertainty value in meters.

<perpendicular axis uncertainty> 8-bit integer

This is the uncertainty value for the perpendicular axis along the Position Uncertainty

Angle. The value returned is a table lookup key that corresponds to the actual uncertainty

value in meters.

<fix> 1-bit integer

0 2D fix – no velocity

1 3D fix – velocity available

<mask> 3-bit integer. This value is used to indicate which fields contain valid information. Bits 3

through 7 are not used.

bit 0 elevation fields are valid when set to 1

bit 1 heading fields are valid when set to 1

bit 2 velocity fields are valid when set to 1

GPS position data is always valid.

<elevation> 16-bit signed integer. This value is the number of meters above or below the WGS-84

reference ellipsoid. The range of this value is -500 to 15883.

<elevation uncertainty> 8-bit integer. The value returned is a table lookup key that corresponds to the

actual elevation uncertainty value in meters.

<heading> 16-bit unsigned integer. This value is the heading in units of 0.3515625 degree. A value of

0 is true north and the angle increases toward the east. The value is in the range 0 to

1024.

<velocity horizontal> 16-bit unsigned integer. This value is the horizontal speed in units of 0.25 meters per

second. The value is in the range from 0 to 511 (127.75 meters per second).

<velocity vertical> 8-bit signed integer. This value is the vertical speed in units of 0.5 meters per second.

The value is in the range 0 to 255 (-64 to +63.5 meters per second).

1 2 ... 160 161 162 163 164 165 166 167 168 169 170 ... 196 197

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