EndRun Meridian II, Руководство пользователя

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M e r i d i a n I I U s e r M a n u a l 110
C H A P T E R T E N
111 M e r i d i a n I I U s e r M a n u a l
R E A R - P A N E L I / O
GSA (GPS DOP and Active Satellites)
The GSA sentence identifies the GPS position fix mode, the Satellite Vehicles (SVs) used for navi-
gation, and the Dilution of Precision (DOP) values. DOP is an indication of the effect of satellite
geometry on the accuracy of the fix. An example is below:
$GPGSA,A,1,,,,,,,,,,,,,,,*1E<CR><LF>
$GPGSA,A,3,18,3,22,6,9,14,19,32,17,1,,,2.0,1.2,1.6*10<CR><LF>
Msg ID $GPGSA
Field 1 A Fixed text “A” shows auto selection of 2D or 3D fix
Field 2 3 Fix type (1=fix not available, 2=2D fix, 3=3D fix)
Field 3 18 PRN of SV used for fix on channel 1 (empty if no SV)
Field 4 3 PRN of SV used for fix on channel 2 (empty if no SV)
Field 5 22 PRN of SV used for fix on channel 3 (empty if no SV)
Field 6 6 PRN of SV used for fix on channel 4 (empty if no SV)
Field 7 9 PRN of SV used for fix on channel 5 (empty if no SV)
Field 8 14 PRN of SV used for fix on channel 6 (empty if no SV)
Field 9 19 PRN of SV used for fix on channel 7 (empty if no SV)
Field 10 32 PRN of SV used for fix on channel 8 (empty if no SV)
Field 11 17 PRN of SV used for fix on channel 9 (empty if no SV)
Field 12 1 PRN of SV used for fix on channel 10 (empty if no SV)
Field 13 empty field PRN of SV used for fix on channel 11 (empty if no SV)
Field 14 empty field PRN of SV used for fix on channel 12 (empty if no SV)
Field 15 2.0 PDOP (position dilution of precision)
Field 16 1.1 HDOP (horizontal dilution of precision)
Field 17 1.6 VDOP (vertical dilution of precision)
Checksum *10
Msg End <CR><LF>
RMC (Recommended Minimum Specific GPS Data)
The RMC sentence identifies the UTC time of fix, status, latitude, longitude, and date. Examples are
below:
$GPRMC,,V,,,,,,,,,,N*53<CR><LF>
$GPRMC,173831.00,A,3827.030,N,12244.020,W,0.08,158.14,200508,,,A*0D<CR><LF>
Msg ID $GPRMC
Field 1 173831.00 UTC time of fix (hhmmss.ss)
Field 2 A GPS receiver warning (A=data valid, V=data not valid)
Field 3 3827.030 Latitude in ddmm.mmm
Field 4 N Direction of latitude (N=north, S=south)
Field 5 12244.020 Longitude in dddmm.mmm
Field 6 W Direction of longitude (W=west, E=east)
Field 7 0.08 Speed over ground, knots
Field 8 158.14 Course made good, degrees True
Field 9 200508 Date of fix (ddmmyy)
Field 10 empty field Magnetic variation
Field 11 empty field Direction of magnetic variation