JRC DGPS224, User Manual, Page: 14 / 20

DGPS224(JLR-4341)
14/20
(6)GSV (GPS Satellites in View)
Version 2.1, 2.3, IEC only
$GPGSV, x,x,xx,xx,xx,xxx,xx,xx,xx,xxx,xx,xx,xx,xxx,xx,xx,xx,xxx,xx*hh<CR><LF>
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
1 : Total number of GSV messages (1 - 3) (Version 2.1)
2 : GSV message number (1 - 3) (Version 2.1)
1 : Total number of GSV messages (1 - 4) (Version 2.3, IEC)
2 : GSV message number (1 - 4) (Version 2.3, IEC)
3 : Satellites in view
4 : 1st satellite PRN number (01 - 32) (2 digit fixed length)
SBAS satellites 120 to 138 are represented by 33 to 51. (Version 2.3, IEC)
33 to 64 are reserved for SBAS satellite use. (Version 2.3, IEC)
5 : 1st satellite elevation angle (00 - 32) (2 digit fixed length)
6 : 1st satellite bearing angle (00 - 90 deg) (3 digit fixed length)
7 : 1st satellite SNR signal strength C/No (00 - 99dB) (2 digit fixed length)
8 – 11 : 2nd satellite information (same as 4 - 7)
12 – 15 : 3rd satellite information (same as 4 - 7)
16 – 19 : 4th satellite information (same as 4 - 7)
Null fields are not required for unused sets when less than four sets are transmitted. (IEC)
20 :
Checksum
Note. Each GSV sentence includes 4 satellites, so the number of GSV sentences varies based on
the number of satellites detected.
If bit rate is set to 4800bps, Maximum GSV message numbers are three (Max 12 satellites).
Therefore, if satellites in view are 12 GPS satellites and 1 SBAS satellite (total 13 satellites),
the GSV sentence is output only 11 GPS satellites and 1 SBAS satellite (total 12 satellites).
(7)DTM (Datum Reference)
Version 2.1, 2.3, IEC only
$GPDTM,ccc,,x.x,a,x.x,a,ux.x,ccc*hh<CR><LF>
1 2 3 4 5 6 7 8
1 : Datum symbol
W84 - WGS84
W72 - WGS72
IHO - datum code (Version 2.1: JRC proprietary value)
IHO - datum code (Version 2.3, IEC: IHO datum code)
(Please refer to "Tables 1 and 2" for datum code)
999 - user defined number
2, 3 : Latitude deviation (min), N / S Note 1)
4, 5 : Longitude deviation (min), E / W Note 1)
6 : Elevation deviation (m), u: sign (+,-) Note 1)
The sign is omitted if value is positive. (IEC)
7
: Reference datum Null or W84 (Version 2.1,JLR-4340)
Reference datum Null or W84 (Version 2.3, IEC)
8 : Checksum
Note 1) Deviation length is not fixed
(8)ZDA (Date and Time)
$GPZDA, hhmmss.ss,xx,xx,xxxx,,*hh<CR><LF>
1 2 3 4 5
1
: UTC time (hours, minutes, seconds, 1/100 sec is fixed at 00)
2 : UTC day (01 - 31)
3 : UTC month (01 - 12)
4 : UTC year
5 : Checksum