NavCom Sapphire Rev.J - Manual (Page 320)

Sapphire Technical Reference Manual Rev. J
320
2.68 NMEAMLA (ASCII)
SF-3050 Sapphire SF-3040
Supported Output Rate: OFF ONCE OnChange OnTime
ONCE = output immediately once
OnChange = when GLONASS almanac is received
OnTime = minimum interval of 60 seconds
This output stream reports orbital data (almanac) for the specified GLONASS satellite and is in
compliance with NMEA-0183 Standards, version 3.0.

This message can now be scheduled ONTIME with a minimum interval of 60 seconds.
When scheduled OnTime, the whole set of NMEAMLA messages, which consists of
multiple messages each containing the almanac for one satellite, will be output at specified
intervals. Within the set, each almanac message will be output at one second at a time.
The output for this message is described in Table 155.
Table 155: MLA Message Output Format
Output
Format
$GLMLA,T.T,S.S,sID,N.N,CH,EEEE,Tn,pppp,tMSB,dtnaco,tascmd,llllll,iaiaia,tLS,
tss*hh
Field# Field Name Description
F1 total Total number of sentences (24)
F2 Sentence Sentence number (01 to 24)
F3 SID Satellite ID (slot) number (01 to 24)
F4 Na Calendar day count within the four-year period beginning with the previous leap
year
F5 CH Cn(a) and Hn(a), generalized health of the satellite (0x80) and carrier frequency
number (0x7F)
F6 eccentricity Eccentricity (S32)
F7 Tn DOT, rate of change of the draconitic circling time (S32)
F8 perigee Argument of perigee (S32)
F9 tMSB 16 MSB of system time scale correction (U16)
F10 dtnaco Correction to the average value of the draconitic circling time (S32)
F11 tascmd Time of the ascension node, almanac reference time (S32)
F12 Long_asc Greenwich longitude of the ascension node (S32)
F13 Corr_incl Correction to the average value of the inclination angle (S32)
F14 tLSB 12 LSB of system time scale correction (U16)
F15 tss Course value of the time scale shift (S32)
F16 *CRC Checksum
Example:
$GLMLA,T.T,S.S,sID,N.N,CH,EEEE,Tn,pppp,tMSB,dtnaco,tascmd,llllll,iaiaia,tLS,tss*hh