SE868-V3 Product User Guide
1VV0301205 r4 – 2016-01-20
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved.
Page 18 of 76
Mod. 0805 2015-02 Rev.4
4.
Product Features
4.1.
Multi-Constellation Navigation
GPS and GLONASS constellations are enabled by default.
The user may enable or disable GPS, GLONASS, and/or BDS constellations via OSP
command MID 222,16. Use of GLONASS or BDS alone may not give optimum positioning
results depending on the region that the receiver is located in.
4.2.
QZSS support
The Japanese SBAS satellites are in a highly-inclined elliptical orbit which is geosynchronous
(not geostationary) and has analemma-like ground tracks. This orbit allows continuous
coverage over Japan using only three satellites. Their primary purpose is to provide
augmentation to the GPS system (which is not supported in the current FW version), but the
signals may also be used for ranging.
QZSS ranging is disabled by default, but can be enabled via OSP command MID 222,16.
4.3.
Satellite Based Augmentation System (SBAS)
The receiver is capable of using SBAS satellites both as a source of differential corrections and
satellite ranging measurements. These systems (WAAS, EGNOS, GAGAN and MSAS) use
geostationary satellites to transmit regional corrections via a GNSS-compatible signal.
4.3.1.
SBAS Corrections
The SBAS satellites transmit a set of differential corrections using a signal similar to that of the
GPS signals and in the same frequency band. The use of SBAS corrections can improve
positioning accuracy.
SBAS corrections are disabled by default but can be enabled via OSP MIDs 133, 138, and 170
commands. Thereafter, the receiver will demodulate and use corrections data from the SBAS
signal.
4.3.2.
SBAS Ranging
The use of SBAS satellites can augment the number of measurements available for the
navigation solution, thus improving availability and accuracy.
SBAS satellite ranging is disabled by default but can be enabled via a $PSRF103 NMEA
command or OSP Mode Control command (MID 136).
4.4.
Elevation Mask Angle
The default elevation mask angle is 5° which can be changed using OSP MID 139.