Study of the GNSS Jamming in Real Environment
Abstract
GNSS systems are susceptible to radio interference
despite then operating in a spread spectrum. The commerce
jammers power up to 2 watts that can block the receiver function
at a distance of up to 15 kilometers in free space.
Two original methods for GNSS receiver testing were developed.
The first method is based on the usage of a GNSS simulator
for generation of the satellite signals and a vector signal RF
generator for generating different types of interference signals.
The second software radio method is based on a software GNSS
simulator and a signal processing in Matlab. The receivers were
tested for narrowband CW interference, FM modulated signal
and chirp jamming signals, and scenarios. The signal to noise
ratio usually drops down to 27 dBc-Hz while the jamming to
signal ratio is different for different types of interference. The
chirp signal is very effective.
The jammer signal is well propagated in free space while in
the real mobile urban and suburban environment it is usually
strongly attenuated.
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