Geophysical Survey Systems, Inc.
SIR® 4000
Manual
MN72-433 Rev F
132
Scan Count at File scan 42 = 1649257
Time at scan 16 relative to scan 0 = (1648784 – 1648470)/473 = 0.66 seconds
Time at scan 42 relative to scan 0 = (1649257– 1648470)/473 = 1.66 seconds
$GPGGA sentence structure
Name
Example
Description
Sentence Identifier
$GPGGA
Global Positioning Fix Data
Time of Position
112921.00
11:29:21 UTC (Universal Time Coordinated)
Latitude N or S
4343.9993927,N
43d 43.9993927' N (negative N values indicate
S)
Longitude E or W
00148.7984187,E
1d 48.7984187' E (negative E values indicate W)
Fix Quality
0 = Invalid
1 = GPS fix
2 = DGPS fix
2
Data is from a DGPS fix
Number of Satellites in Use
12
12 satellites used
Horizontal Dilution of Position
(HDOP)
0.8
Relative accuracy of horizontal position
Antenna altitude above/below
mean sea level (geoid), and units
of altitude (i.e., antenna height)
192.470,M
192.470 meters
Geoidal separation (difference
between WGS-84 ellipsoid and
mean sea level (+/- above/below
ellipsoid), and units of geoidal
separation
49.746,M
49.746 meters
Age in seconds since last update
from differential reference station
(i.e., DGPS update)
6.0
6.0 seconds
Differential reference station
(DGPS) ID number
0136
(France)*
Checksum
*46
Used to check for transmission errors - refers to
all bytes between the $ and the * (not including
delimiters) written in hexadecimal
Summary of Contents for SIR 4000
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Page 116: ...Geophysical Survey Systems Inc SIR 4000 Manual MN72 433 Rev F 110 ...
Page 140: ...Geophysical Survey Systems Inc SIR 4000 Manual MN72 433 Rev F 134 ...
Page 150: ...Geophysical Survey Systems Inc SIR 4000 Manual MN72 433 Rev F 144 ...
Page 156: ...Geophysical Survey Systems Inc SIR 4000 Manual MN72 433 Rev F 150 ...
