User's Manual

SPSx80 Smart GPS Antenna User Guide 95
GSOF Messages B
Velocity
This message provides velocity information. It contains the following data:
• Horizontal velocity, in meters per second
• Vertical velocity, in meters per second
• Heading, in radians, referenced to WGS-84 True North
PDOP
This message describes the PDOP information. It contains the following data:
• PDOP
• HDOP
• VDOP
• TDOP
SIGMA
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
Table B.6 Velocity (Type 8 record)
Field Item Type Value Meaning
0 Output record type Char 08h Velocity data output record
1 Record length Char 0Dh Bytes in record
2 Velocity flags Char See Table B.17 Velocity status flags
3–6 Speed Float Meters per second Horizontal speed
7–10 Heading Float Radians True north heading in the WGS-84 datum
11–14 Vertical velocity Float Meters per second Vertical velocity
Table B.7 PDOP (Type 9 record)
Field Item Type Value Meaning
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