Seres Reference Manual
35
The estimated positioning precision is accessible through the use of NMEA
0183 command responses as described in Chapter 6. Although this
feature is intended for advanced users, it will provide the real-time
estimates of precision. As the receiver is not able to determine accuracy
with respect to a known location in real time (this is traditionally
performed in post-mission analyses), the precision numbers are relative in
nature.
Satellite acquisition quality is described as a signal to noise ratio (SNR). A
higher SNR is indicative of better quality signal reception. SNR information
is provided by the Seres through the use of NMEA 0183 data messages
available via its dual serial ports.
SNR values for the receiver should be over 35 for best tracking
performance. Foliage or partial signal blockages above the antenna can
reduce the reception quality, and hence SNR.
3.2
SBAS Operation
The following sections describe the general operation and performance
monitoring of the SBAS demodulator within the Seres smart antenna.
3.2.1
Automatic Tracking
The SBAS demodulator featured within the Seres will automatically scan
and track the SBAS satellite signals. This automatic tracking allows you to
focus on other aspects of receiver operation without the need to tune the
receiver.
The SBAS demodulator features two-channel tracking that provides an
enhanced ability to maintain acquisition on a SBAS satellite in regions where
more than one satellite is in view. This redundant tracking approach will
result in more consistent acquisition of a signal when in an area where
signal blockage of either satellite is possible.
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