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B     GSOF Messages

144     SPSx51 Modular GPS Receivers User Guide

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

This message provides detailed satellite information. It contains the following data:

Number of satellites tracked

The PRN number of each satellite

Flags indicating satellite status

Elevation above horizon, in degrees

Azimuth from True North, in degrees

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

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.

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.

Table B.11

SV brief (Type 13 record)

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

1

Includes all tracked satellites, all satellites used in the position solution, and all satellites in view.

The following bytes are repeated for Number of SVs

PRN

Char

01h-20h

Pseudorandom number of satellites (1-32)

SV Flags1

Char

See

First set of satellite status bits

SV Flags2

Char

See

Second set of satellite status bits

Table B.10

Sigma (Type 12 record) (continued)