RoyalTek Onyx RFG-2000, Руководство пользователя, Страница: 22 / 27

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and SNR value. The information for four satellites maximum per one message,
additional messages up to maximum of eight sent as needed. The satellites
are in PRN number order.
Before a position fix is acquired the information contains only the SNR (signal
to noise ratio) value. After a fix is acquired, also the elevation and azimuth
angles are added. Note that there can be also “theoretical” satellites in the
GSV message. These are satellites of which the angles (elevation, azimuth)
are known but for some reason, e.g. due to an obstruction, have not been
found by Onyx. The SNR value for these satellites is set to zero.
Please notice that as all the satellites that in the view are reported, the
amount of satellites may occasionally be more than the number of receiver
tracking channels, 12.
$GPGSV,n,m,ss,xx,ee,aaa,cn,…………. ,xx,ee,aaa,cn*hh<CR><LF>
Example:
$GPGSV 4,1,14,03,66,207,50,08,09,322,44,11,01,266,42,14,00,155,00*79
$GPGSV,4,2,14,15,41,088,48,17,21,083,44,18,57,087,51,21,57,173,50*78
$GPGSV,4,3,14,22,05,203,00,23,52,074,49,26,17,028,44,27,00,300,00*79
$GPGSV,4,4,14,28,32,243,00,31,48,286,00*70
Name Example Units Description
Message ID $GPGSV
GSV protocol header
Number of Messages 4
n
Total number of messages, 1 to 9
Messages Number 1
m
Message number, 1 to 9
Satellites in View 14
ss
Total number of satellites in view
Satellite ID 03
xx
Satellite ID (PRN) number
Elevation 66 degrees
ee
Satellite elevation, degrees 90 max
Azimuth 207 degrees
aaa
Satellite azimuth, degrees True, 000 to
359
SNR (C/No) 50 dBHz
cn
SNR ( C/No) 00-99 dB-Hz. zero when
not tracking
…. … …
….
Checksum *79
*hh