GLOBALSTAR PROPRIETARY AND CONFIDENTIAL INFORMATION
Use or disclosure of data contained on this sheet is subject to the restrictions in the Distribution Statements on the title page of this
document.
06/18/20
Subject to Change without Notice
P a g e | 36
Initiate proprietary track response
Byte
Bits
Parameter
Description
0
0 - 7
Leader
Always a value of 0xAA.
1
0 - 7
Length
0x5
2
0 - 7
Command Code.
0x30 = ACK or 0xFF = NAK
3 -4
0 - 15
CRC
Example Response:
AA 05 30 5A F5
Example Payload:
0xAA
2B4856
BFF032
BBCC
Where:
2B4856
is the 24-bit latitude
30.433051586151 (North)
BFF032
is the 24-bit longitude -90.086817741394 (West)
See section 4.6: “24 bit
location format” for documentation of the encoding/decoding of Globalstar on
-air location data.
4.2.2.14
“Proprietary Motion Activated Track” command
This command allows the initiation of a periodic track with user defined data prepended and appended to the latitude
and longitude fields. A periodic 9-byte custom track message, transmitted nominally at the interval specified, will result.
In this mode, tracking will suspend when the accelerometer detects that the device is not moving, and then resume
when it detects that the device is moving again.
The behavior of this mode differs somewhat from the same mode’s behavior in the STINGR product. In the
ST100 board
implementation, if the interval is set to 30 minutes or greater, a redundant burst transmission will be initiated at each
interval, with the number of attempts and the timing between the attempts as specified in the “setup” command.
While in Proprietary Track mode with an interval of 30 minutes or less, the GPS will retain its clock and ephemeris data
in o
rder to perform a “hot” GPS fix. This will increase the GPS standby current to the “GPS Standby Mode” value in
Table 4. For tracking intervals greater than 30 minutes, the GPS will be powered off in between transmissions and the
sleep current will be the
“Standby Mode” value in Table 4.
If the interval is 40 minutes or greater, the ST100 board will randomize the start of each burst by +- 10 minutes around
the nominal. For example, if a track mode with an interval of 1 hour is started at 12:00, the next bursted position report
will begin randomly between 12:50 and 1:10, the one after that will begin between 1:50 and 2:10, etc.
If the unit is a
lready in a track mode, and this command is sent, it will be NAKed. To change the track rate, the “Cancel
Propri
etary Track” command must be sent, and a new track command then issued.
