Trimble Inc. 6248192-B1 Manuel D’Utilisation
B GSOF Messages
96 SPSx80 Smart GPS Antenna User Guide
•
Covariance east-north
•
Error Ellipse Semi-major axis, in meters
•
Error Ellipse Semi-minor axis, in meters
•
Orientation of Semi-major axis in degrees from True North
•
Unit variance
•
Number of epochs
SV Brief
This message provides brief satellite information. It contains the following data:
•
Number of satellites tracked
•
The PRN number of each satellite
•
Flags indicating satellite status
Table B.8
Sigma (Type 12 record)
Field
Item
Type
Value
Meaning
0
Output record type
Char
0Ch
Position sigma information output record
1
Record length
Char
26h
Bytes in record
2–5
Position RMS
Float
Root means square of position error calculated
for overdetermined positions
for overdetermined positions
6–9
Sigma east
Float
Meters
10–13
Sigma north
Float
Meters
14–17
Covar. east-north
Float
number
Covariance east-north (dimensionless)
18–21
Sigma up
Float
Meters
22–25
Semi-major axis
Float
Meters
Semi-major axis of error ellipse
26–29
Semi-minor axis
Float
Meters
Semi-minor axis of error ellipse
30–33
Orientation
Float
degrees
Orientation of semi-minor axis, clockwise from
True North
True North
34–37
Unit variance
Float
Valid only for over-determined solutions. Unit
variance should approach 1.0 value. A value of
less than 1.0 indicates that apriori variances are
too pessimistic.
variance should approach 1.0 value. A value of
less than 1.0 indicates that apriori variances are
too pessimistic.
30–39
Number of epochs
short
count
Number of measurement epochs used to
compute the position. Could be greater than 1
for positions subjected to static constraint.
Always 1 for kinematic.
compute the position. Could be greater than 1
for positions subjected to static constraint.
Always 1 for kinematic.
Table B.9
SV brief (Type 13 record)
Field Item
Type
Value
Meaning
0
Output record type Char
0Dh
Brief satellite information output record
1
Record length
Char
Bytes in record
2
Number of SVs
Char
00h-18h
Number of satellites included in record
1