Novatel OM-20000041 用户手册

D

Logs summary

MiLLennium GPSCard Software Version 4.50 Command Descriptions Manual Rev 1

153

The dilution of precision data is calculated using the geometry of only those satellites that are currently being
tracked and used in the position solution by the GPSCard and updated once every 60 seconds or whenever a change
in the constellation occurs. Therefore, the total number of data fields output by the log is variable, depending on
the number of 

SV

s tracking. Twelve is the maximum number of 

SV

 

PRN

s contained in the list.

If a satellite is locked out using the 

LOCKOUT

 command, it will still be shown in the 

PRN

 list, but is 

significantly deweighted in the 

DOP

 calculation.

$DOPA,637,512473.00,2.9644,2.5639,2.0200,1.3662,1.4880,6,18,6,11,2,16,19
*29[CR][LF]

$DOPA

week

seconds

gdop

pdop

htdop

hdop

tdop

# sats

prn list

*xx

[CR][LF]

1

$DOPA

Log header

$DOPA

2

week

GPS week number

637

3

seconds

GPS seconds into the week

512473.00

4

gdop

Geometric dilution of precision - assumes 3-D position and receiver clock offset (all 
4 parameters) are unknown

2.9644

5

pdop

Position dilution of precision - assumes 3-D position is unknown and receiver clock 
offset is known

2.5639

6

htdop

Horizontal position and time dilution of precision.

2.0200

7

hdop

Horizontal dilution of precision.

1.3662

8

tdop

Time dilution of precision - assumes 3-D position is known and only receiver clock 
offset is unknown

1.4880

9

# sats

Number of satellites used in position solution (0-12)

6

10...

prn list

PRN list of SV PRNs tracking (1-32), null field until first position solution available

18,6,11,2,16,
19

variable

*xx

Checksum

*29

variable

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