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