REFERENCE MANUAL - FTP Directory Listing - Trimble
REFERENCE MANUAL - FTP Directory Listing - Trimble
REFERENCE MANUAL - FTP Directory Listing - Trimble
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TRIMBLE STANDARD INTERFACE PROTOCOL (TSIP)<br />
A<br />
The seconds count begins with “0” each Sunday morning at midnight GPS time. A<br />
negative indicated time-of-week indicates that time is not yet known; in that case, the<br />
packet is sent only on request. The following table shows the relationship between the<br />
information in Packet 0x41, and the Packet 0x46 status code.<br />
Table A.26<br />
Packets 0x41 and 0x46 Status Code Relationships<br />
Approximate<br />
Time Accuracy<br />
Time Source Sign (TOW) Packet 46<br />
Status Code<br />
none no time at all - 0x01<br />
unknown<br />
approximate time from<br />
real-time clock or Packet<br />
2E<br />
+ 0x01<br />
20-50 msec + clock time from satellite + 0x02 - 0x0C<br />
drift<br />
full accuracy time from GPS solution + 0x00<br />
Note – Before using the GPS time from Packet 0x41, verify that the Packet 0x46<br />
status code is 00 (“Doing position fixes”). This will ensure the most accurate GPS<br />
time.<br />
Report Packet 0x42 - Single-Precision Position Fix, XYZ ECEF<br />
This packet provides current GPS position fix in XYZ ECEF coordinates. If the I/O<br />
“position” option is set to XYZ ECEF<br />
(byte 0: bit 0, Packet 0x35)and the I/O Precision-of-Position Output (byte 0: bit 4,<br />
Packet 0x35) is set to single-precision, then the GPS receiver sends this packet each<br />
time a fix is computed. The data format is shown below.<br />
Table A.27<br />
Report Packet 0x42 Data Formats<br />
Byte Item Type Units<br />
0-3 X Single meters<br />
4-7 Y Single meters<br />
8-11 Z Single meters<br />
12-15 Time-of-fix Single seconds<br />
The time-of-fix is in GPS time or UTC as selected by the I/O “timing” option. Packet<br />
83 provides a double-precision version of this information.<br />
Copernicus GPS Receiver 141