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发表于 2013-7-14 00:24:42
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ABSTRACT
Digital beamforming is an effective way to improve
gain in the direction of a transmitting GNSS satellite, and
to null in the direction of undesired signals such as
interference and multipath. However, the utilisation of
multiple antennas makes the architecture and signal
processing of GNSS receivers significantly different from
single-antenna receivers. This paper describes a method
of simplifying the architecture of multi-antenna GNSS
receivers. The authors propose an alternative
beamforming architecture utilising the maximum Signal
to Interference plus Noise Ratio (SINR) criterion. This
architecture can make the beamforming processing subsystem
a standalone module instead of being integrated
within the tracking loop. A multi-antenna GNSS receiver
was developed based on the Kai Borre single-antenna
GNSS software receiver. Simulation results demonstrate
that this architecture is effective in improving the Carrierto-
Noise power density ratio (C/No) of the received signal,
as well as in reducing the receiver tracking error. |
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