Industrial Tracker Reference Guide FW 1.8 V0.2
6.5.1
GPS fix payload
Common header
Positon informaton data
Byte 0i4
Byte 5
Byte 6i8
Byte 9i11
Byte 12
Byte 13i15
Header tith Opt=0
Age
Lattude
Longitude
EHPE
Encrypted
Age
: Time diference betteen the fx and the Lora transmission.
lo
= 0,
hi
= 2040,
nbits
= 8,
resv
= 0. Expressed in seconds. The step is 8 seconds.
Lattude
: Lattude of the positon (expressed in degree) calculated as follot:
Lattude = Lattude << 8
If Lattude > 0x7FFFFFFF then Lattude = Lattude – 0x100000000
Lattude = Lattude / 10
7
Longitude
: Longitude of the positon (expressed in degree) calculated as follot:
Longitude = Longitude << 8
If Longitude > 0x7FFFFFFF then Longitude = Longitude – 0x100000000
Longitude = Longitude / 10
7
EHPE
: Estmated Horizontal Positon Error, expressed in meters.
lo
= 0,
hi
= 1000,
nbits
= 8,
nresv
= 0. The step is 3.9 meters.
Encoded form is detailed in the
secton.
6.5.2
GPS tmeout payload
Common header
Positon informaton data
Byte 0i4
Byte 5
Byte 6
Byte 7
Byte 8
Byte 9
Header tith Opt=1
Cause
C/N 0
C/N 1
C/N 2
C/N 3
Cause
: Timeout cause
0 – User tmeout cause
C/N 0
: Carrier over noise (dBm) for the frst 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
1i The satellites are ordered based on their C/N. The best is sent in C/N 0.
2i
C/N
encoding uses:
lo
= 0,
hi
=50,
nbits
=8,
nresv
= 0. It is expressed in dBm tith a step of
0,2dBm
3i Encoded form is detailed in the
secton.
Page 24 of 46
10th July 2019
Restricted distribution