Data record subtype 1: Position (record type 11)

The following table shows the additional records provided in Report Packet 57h when the Position Record is enabled with Command Packet 56h.

Position Record Length = 78 + N * 2, where N is the number of satellites

Position flags bit values are also shown below.

Subtype 1: Position Record (Record 11)

Byte

Item

Type

Value

Meaning

8–15

LATITUDE

8 (double)

Units in semi-circles

Semi-circle angle = radians / Pi

16–23

LONGITUDE

8 (double)

Units in semi-circles

Semi-circle angle = radians / Pi

24–31

ALTITUDE

8 (double)

Meters

Altitude

32–39

CLOCK OFFSET

8 (double)

Meters

Clock offset

40–47

FREQUENCY OFFSET

8 (double)

Hz

Frequency offset from 1536*1.023 MHz

48–55

PDOP

8 (double)

 

PDOP (dimensionless)

56–63

LATITUDE RATE

8 (double)

Radians per second

Latitude rate

64–71

LONGITUDE RATE

8 (double)

Radians per second

Longitude rate

72–79

ALTITUDE RATE

8 (double)

Meters per second

Altitude rate

80–83

GPS MSEC OF WEEK

4 (unsigned long)

msecs

Position time tag

84

POSITION FLAGS

1 (byte)

See Position flags bit values below.

Position status flags

85

# OF SVS

1 (byte)

00h–0Ch

Number of satellites used to compute position solution (0–12)

Repeated for # of SVs

 

CHANNEL #

1 (byte)

 

Channel used to acquire satellite measurement. Zero is reported for RTK solutions.

Repeated for # of SVs

 

PRN #

1 (byte)

 

PRN number of satellite
 

---------- End of Subtype 1 ----------

Position flags bit values

Bit

Notes

0–2

Position flag and position type definition:

0: 0D position fix (clock-only solution) (1+ SVs) (if # of SVs used is non-zero)
1: 1D position fix (height only with fixed latitude/longitude) (2+ SVs)
2: 2D position fix (fixed height and clock) (2+ SVs)
3: 2D position fix (fixed height) (3+ SVs)
4: 3D solution (4+ SVs)
5: 3D Solution (4+ SVs) Wide Area/Network RTK

3

RTK Solution: if set, position is fixed RTK, else float RTK:

0: Floating integer ambiguity
1: Fixed integer ambiguity

4

DGPS Differential Corrections:

0: No DGPS corrections are used in position computation
1: DGPS corrections are used to compute position

5

Reserved (set to zero)

6

RTK Solution: if set, position is from RTK (including Location RTK):

0: False
1: True

7

Position Derived While Static (RTK only):

0: False
1: True

Bit combinations:

  • Bit 4 and 6 are set if the solution type is SBAS

  • Bit 5 and 4 are set if the solution type is OmniSTAR HP/XP