Abeeway Micro Tracker - Page 27

Micro Tracker Reference Guide FW 1.7 V1.1
Page 27 of 39
11th october 2018
Restricted distribution
5.5.1 GPS fix payload
Common header
Data
Byte 0-4
Byte 5
Byte 6-8
Byte 9-11
Byte 12
Byte 13-15
Header
Age
Latitude
Longitude
EHPE
Encrypted
Age: Age of the fix. Encoded form using lo= 0, hi= 2040, nbits= 8, nresv= 0. Expressed in seconds. The step is
8 seconds.
Latitude: Latitude of the position (expressed in degree) calculated as follow:
Latitude = Latitude << 8
If Latitude > 0x7FFFFFFF then Latitude = Latitude – 0x100000000
Latitude = Latitude / 10
7
Longitude: Longitude of the position (expressed in degree) calculated as follow:
Longitude = Longitude << 8
If Longitude > 0x7FFFFFFF then Longitude = Longitude – 0x100000000
Longitude = Longitude / 10
7
EHPE: Estimated Horizontal Position Error, expressed in meters. Encoded form using lo= 0, hi= 1000, nbits=
8, nresv= 0. The step is 5.9 meters.
Encoded form is detailed in the Encoded form section.
5.5.2 GPS timeout payload
Common header
Data
Byte 0-4
Byte 5
Byte 6
Byte 7
Byte 8
Byte 9
Header
Cause
C/N 0
C/N 1
C/N 2
C/N 3
Cause: Timeout cause
➢ 0 - User timeout cause
C/N 0: Carrier over noise (dBm) for the first satellite seen.
C/N 1: Carrier over noise (dBm) for the second satellite seen.
C/N 2: Carrier over noise (dBm) for the third satellite seen.
C/N 3: Carrier over noise (dBm) for the fourth satellite seen.
Notes:
1- C/N encoding uses: lo= 0, hi=2040, nbits=8, nresv= 0. It is expressed in dBm with a step of 0,2dBm
2- Encoded form is detailed in the Encoded form section.
5.5.3 WIFI timeout payload
Common header
Data
Byte 0-4
Byte 5
Byte 6
Byte 7
Byte 8
Byte 9
Byte 10
Header
v_bat1
v_bat2
v_bat3
v_bat4
v_bat5
v_bat6
v_bat1: encoded voltage at the start time (T0) of the WIFI scan.
v_bat2: encoded voltage at T0 + 0.5 second.
v_bat3: encoded voltage at T0 + 1 second.
v_bat4: encoded voltage at T0 + 1.5 second.