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WAAS G-III Reference Receiver User Manual Rev 1
Chapter 5
Data Logs
5.5.17
SATPOSB
This log contains the calculated satellite position, elevation angles, azimuth angles and calculated Dopplers for
all GPS satellites. The accuracy of the data is dependent on the accuracy of the input position since the G-III
Reference Receiver does not calculate its own position.
The satellite position is in WGS84 ECEF coordinates.
Output states
: Operational
Valid trigger
: ONCE,
ONTIME
Frequency
: Requested
frequency
Message ID
: 4106
Header Format
:
G-III Log
Field
Field Name
Description
Format
# Bytes
Binary Offset
1
Header
G-III log header
H
0
2
System
System the log pertains to
0 = GPS
Enum
4
H
3
Sat vis
Indicates if the satellite visibility is valid.
Bool
4
H+4
4
Comp alm
Indicates if the entries in the log are computed
from the almanac.
TRUE = all data in the log is computed from the
almanac
FALSE = all data in the log is computed from
the ephemeris.
Bool
4
H+8
5
# entries
Number of entries to follow
Ulong
4
H+12
6
PRN
GPS PRN
Ushort
2
H+16
7
Reserved
Reserved
Ushort
2
H+18
8
EphemValidity
Validity of the ephemeris data:
0 = Data is valid
1 = Data available but health status is all 1s
2 = No data available
Ushort
2
H+20
9
AlmValidity
Validity of almanac data:
0 = Data is valid
1 = Data available but health status is all 1s
2 = No data available
Ushort
2
H+22
10
EphemHealth
Health status from the ephemeris
Ulong
4
H+24
11
EphemElevation
Elevation angle from the ephemeris (degrees)
a
Float
4
H+28
12
EphemAzimuth
Azimuth angle from the ephemeris (degrees)
b
Float
4
H+32
13
EphemDop
Geometric Doppler from the ephemeris (Hz)
Float
4
H+36
14
AlmHealth
Health status from the almanac
Ulong
4
H+40
15
AlmElevation
Elevation angle from the almanac (degrees)
a
Float
4
H+44
16
AlmAzimuth
Azimuth angle from the almanac (degrees)
b
Float
4
H+48
17
AlmDop
Geometric Doppler from the almanac (Hz)
Float
4
H+52