Trimble Inc. 10950 Manual De Usuario
88
Alloy GNSS reference receiver User Guide
GSA
GPS DOP and active satellites
An example of the GSA message string is shown below.
Table A.4
describes the message fields.
$GPGSA,<1>,<2>,<3>,<3>,,,,,<3>,<3>,<3>,<4>,<5>,<6>*<7><CR><LF>
Table A.4 GSA message fields
Field
Meaning
0
Message ID $GPGSA
1
Mode 1, M = manual, A = automatic
2
Mode 2, Fix type, 1 = not available, 2 = 2D, 3 = 3D
3
PRN number, 01 through 32, of satellite used in solution, up to 12 transmitted
4
PDOP-Position dilution of precision, 0.5 through 99.9
5
HDOP-Horizontal dilution of precision, 0.5 through 99.9
6
VDOP-Vertical dilution of precision, 0.5 through 99.9
7
The checksum data, always begins with *