Source Localization with MIMO Systems
2017
Sources localization is used in radar, sonar, and
telecommunication. Radar has numerous civilian and
military applications. Radar system has gone through
many developments over the last few decades and
reached the latest version known as MIMO radar. A
MIMO radar is composed of multiple transmitting and
receiving antennas like a conventional phased array
radar. However, its transmitting antennas transmit linearly
independent signals so that they can be easily
identified by the matched filters bank at its receiving
end. The matched filtered signals are then processed
to extract the ranges, DOAs, DODs, velocities, etc. of
the targets. A bistatic MIMO radar system provides
high resolution, spatial diversity, parameter identifiability,
etc. which inspired us to use it in this work. There
are many existing methods to deal with the far field region
of MIMO radar system. However, little work can
be found on the near field region of a bistatic MIMO
radar which motivated the work in this thesis. Near
field targets localization is also important because of
many indoor applications. Most of the existing near
field sources localization techniques use Fresnel approximation
in which the real spherical wavefront is assumed
quadric unlike planar in far field situation. In
this work we have proposed a novel near field targets
localization method using Fresnel approximation. The
Fresnel approximation leads to a biased estimation of
the location parameters because the true wavefront is
spherical. Consequently, we have proposed two correction
methods to reduce the effects of Fresnel approximation
and other two methods which directly use
the exact signal model based on spherical wavefront.
Keywords:
- Correction
- Source
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