18
4.2.4
GLONASS System Almanac Data (GLMLA)
GLONASS almanac sentences are not transmitted by default. Send the $PGRMO,GLMLA,1 sentence to the GPS
sensor to initiate GLONASS almanac transmission. Upon receipt, the GPS sensor will transmit available almanac
information using GLMLA sentences. During the transmission of almanac sentences, output of other NMEA 0183
sentences is temporarily suspended.
$GLMLA,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,<10>,<11>,<12>,<13>,<14>,<15>*hh<CR><LF>
<1>
Total number of MLA sentences to be transmitted by the GPS sensor during GLONASS
almanac download.
<2>
Number of current MLA sentence.
<3>
Satellite ID (slot) number, 01 to 32
<4>
Calendar day count within the four year period beginning with the previous leap year
<5>
SV health (bit 7) and carrier frequency number (5 LSB bits)
<6>
Eccentricity (15 LSB bits)
<7>
(Delta TnA) DOT, rate of change of draconitic circling time (7 LSB bits)
<8>
Omega, argument of perigee
<9>
Tau cA, system time scale correction (16 MSB)
<10>
Delta TnA, correction to the average value of draconitic circling time (24 bits)
<11>
Time of the ascension node, almanac reference time (21 bits)
<12>
Greenwich longitude of ascension node (21 bits)
<13>
Delta InA, correction of the average value of the inclination angle (20 bits)
<14>
Tau cA, system time scale correction (12 LSB)
<15>
Tau nA, course value of the time scale shift (10 bits)
4.2.5
Global Positioning System Fix Data (GGA)
$..GGA,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,M,<10>,M,<11>,<12>*hh<CR><LF>
<1>
UTC time of position fix, hhmmss or hhmmss.t format for GPS 19x HVS
<2>
Latitude, ddmm.mmmm format for GPS 19x HVS (leading zeros will be transmitted)
<3>
Latitude hemisphere, N or S
<4>
Longitude, dddmm.mmmm format for GPS 19x HVS (leading zeros will be transmitted)
<5>
Longitude hemisphere, E or W
<6>
GPS quality indication, 0 = fix not available, 1 = Non-differential GPS fix available, 2 =
Differential GPS (WAAS) fix available, 6 = Estimated
<7>
Number of satellites in use, 00 to 12 (leading zeros will be transmitted)
<8>
Horizontal dilution of precision, 0.5 to 99.9
<9>
Antenna height above/below mean sea level, -9999.9 to 99999.9 meters
<10>
Geoidal height, -999.9 to 9999.9 meters
<11>
Null (Differential GPS)
<12>
Null (Differential Reference Station ID)
4.2.6
GPS DOP and Active Satellites (GSA)
$..GSA,<1>,<2>,<3>,<3>,<3>,<3>,<3>,<3>,<3>,<3>,<3>,<3>,<3>,<3>,<4>,<5>,<6>*hh<CR><LF>
<1>
Mode, M = Manual, A = Automatic
<2>
Fix type, 1 = not available, 2 = 2D, 3 = 3D
<3>
PRN number, 01 to 32, of satellite used in solution, up to 12 transmitted (leading zeros will be
transmitted)
<4>
Position dilution of precision, 0.5 to 99.9
<5>
Horizontal dilution of precision, 0.5 to 99.9
<6>
Vertical dilution of precision, 0.5 to 99.9
