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Table 3-3 SXBlue II-B GPS Performance – SNR Reading
3.4.2 Activating an OmniSTAR VBS Service (SXBlue II-L GPS)
The SXBlue II-L GPS is capable of receiving a differential correction signal from the OmniSTAR
networks. This is a paid subscription with OmniSTAR and not offered by Geneq inc.
OmniSTAR offers various differential correction services: VBS, XP and HP. The SXBlue II-L
GPS is a single frequency receiver and only uses the VBS service for submeter operations. To
activate the service OmniStar Customer Service should be contacted
http://www.omnistar.com/services.html
The model: SXBlue II-L GPS from Geneq inc.
•
The Serial Number. This number consists of the last 6 digits of the serial number written
•
on the side of the receiver, for example: 0812L001-810133. These last 6 digits are the
internal GPS engine serial number. Alternatively, the engine serial number can be
retrieved with the $JI command:
$>JI,810133,1,3,09031998,01/06/1998,12/31/2018,3.5,31
Instructions on how to complete the initial subscription process will also be given by OmniSTAR
customer service.
3.4.3 RTCM Input Correction in the SBAS Application
The SXBlue II GPS Serial port can be used to accommodate externally supplied corrections
input according to the RTCM SC-104 protocol.
To use the Serial port of the SXBlue II GPS for correction input you must set the SXBlue II GPS
to operate in other differential mode using the following command while connected to the Serial
port:
Although the following RTCM SC-104 message types don't all contain differential data, the
SXBlue II GPS is compatible with them.
• Type 1
• Type 2
• Type 3
SXBlue II GPS Series Technical Reference Manual
SNR
Reception Quality
> 25
Excellent
20 to 25
Very Good
15 to 20
Good
10 to 15
Stable
7 to 10
Intermittent
< 7
No Lock
and the following information given:
$JDIFF,THIS<CR><LF>
Data Throughput
100%
100%
Good (up to 100%)
Moderate to Good
Low
No data throughput
50
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