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SPSx51 Modular GPS Receivers User Guide     

GSOF Messages     

This message describes the PDOP information. It contains the following data:

PDOP

HDOP

VDOP

TDOP

This message describes the Position Sigma information. It contains the following data:

Position RMS

Sigma east, in meters

Sigma north, in meters

Sigma up, in meters

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

Table B.9

PDOP (Type 9 record)

0

Output record type Char

09h

PDOP information output record

1

Record length

Char

10h

Bytes in record

2–5

PDOP

Float

Positional Dilution of Precision

6–9

HDOP

Float

Horizontal Dilution of Precision

10–13

VDOP

Float

Vertical Dilution of Precision

14–17

TDOP

Float

Time Dilution of Precision

Table B.10

Sigma (Type 12 record)

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 

6–9

Sigma east

Float

Meters

10–13

Sigma north

Float

Meters

14–17

Covar. east-north

Float

number

Covariance east-north (dimensionless)