A Trimble Standard Interface Protocol (TSIP)
1 0 4 Lassen SQ GPS Receiver
A.15.25
Report Packet 0x4A - 20 Byte Format
This packet provides current GPS position fix in LLA (latitude,
longitude, and altitude) coordinates. If the I/O Position option is set to
LLA and the I/O Precision-of-Position Output is set to single-
precision (all controlled by Packet 35), then the receiver sends this
packet each time a fix is computed. Command Packet 35 controls
position output (XYZ or LLA) and (single or double) output precision.
The data format is shown in below.
The default altitude conversion is WGS-84. Altitude is referred to the
datum ellipsoid or the MSL Geoid, depending on which I/O “LLA
altitude” option is selected. The time-of-fix is in GPS time or UTC,
depending on which I/O “timing” option is selected. This packet also
is sent at start-up with a negative time-of-fix to report the current
known position. Packet
0x
84 provides a double-precision version of
this information
Warning – When converting from radians to degrees, significant and
readily visible errors will be introduced by use of an insufficiently precise
approximation for the constant PI). The value of the constant PI as
specified in ICD-GPS-200 is 3.1415926535898.
Table A.29
Report Packet 0x4A Data Formats
Byte
Item
Type
Units
0-3
Latitude
Single
radians; + for north, - for south
4-7
Longitude
Single
radians; + for east, - for west
8-11
Altitude
Single
meters (HAE or MSL)
2-15
Clock Bias
Single
meters
6-19
Time-of-Fix
Single
seconds (GPS or UTC)
Summary of Contents for SQ
Page 4: ......
Page 12: ...Contents xii Lassen SQ GPS Receiver...
Page 14: ...About this Manual xiv Lassen SQ GPS Receiver...
Page 46: ...2 Hardware Integration 32 Lassen SQ GPS Receiver...
Page 150: ...B TSIP Tool kit User s Guide 136 Lassen SQ GPS Receiver...
Page 166: ...C NMEA 0183 152 Lassen SQ GPS Receiver...
Page 171: ...Lassen SQ GPS Receiver 157 Specifications and Mechanical Drawings D...
Page 175: ...Lassen SQ GPS Receiver 161 Specifications and Mechanical Drawings D...
Page 179: ...Lassen SQ GPS Receiver 165 Specifications and Mechanical Drawings D...
Page 181: ...Lassen SQ GPS Receiver 167 Specifications and Mechanical Drawings D...
Page 182: ...D Specifications and Mechanical Drawings 168 Lassen SQ GPS Receiver...