Vector Tracking with a Multi Antenna GNSS Receiver
2012
In digital beamforming receivers the tracking of satellite
signals which have a similar direction of arrival like the
interference source often lose lock. A very difficult and
time consuming reacquisition is the consequence. Especially
in scenarios with moving receivers or RFI sources,
gradually all satellites might get lost due to the change of
the directions of arrival between the satellite signals and
the RFI source. In single antenna receivers a very similar
effect can be observed in urban canyons. According to the
movement of the receiver different parts in the receiver’s
skyplot are obstructed due to buildings or other obstacles.
Vector tracking is a well-known technique to improve the
GNSS availability in such scenarios. This paper describes
an approach to integrate a vector delay and frequency
locked loop (VDFLL) in a digital beamforming receiver.
The proposed architecture consists of a pre-correlation
prewhitening module and a VDFLL with an integrated
post-correlation eigenbeamformer. The architecture of
this approach will be described in detail and the potential
capabilities will be shown by the results of a measurement
campaign with a personal privacy device jammer.
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