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Copernicus GPS Receiver     1 4 5

TRIMBLE STANDARD INTERFACE PROTOCOL (TSIP)     A

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 datum 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 
is also 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

C

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. 
Single precision LLA has a quantization of approximately 2 meters.

Table A.32

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)