M-system HDMS, Руководство пользователя

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Aftermarket – HDMS FMCW RADAR
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Aggressor and the Victim, the
probability of interference on more
than one chirp is reduced.
dithering as well
(software control).
3
Direction
specific
predefined
frequency band
separation.
Use a separate RF bandwidth for
long range RADAR, and short-
range RADAR. Use a different RF
Bandwidth for front facing RADAR,
and another band for rear facing
RADAR.
Yes.
Debatable usefulness
Very simple to
implement and process.
4
Detect
interference
and repair Rx
results
The region of the ADC affected by
interference is deduced, and
‘repaired’. Detection is performed
using statistical information of the
ADC data. Repairing involves
–
interpolation (for short sections) or
‘signal healing’..
Yes. IWR1443 devices
provide side channel
information (called
chirp quality) to aid in
narrowing down the
region of interference.
Very Useful.
5
Dithering the
phase of each
chirp
Randomize the transmitted phase
of each chirp. Since the aggressor
would have no notion of this
randomized phase, the phase of
the interference event would be
randomized spreading the
interference across chirps
Yes.
Extremely Useful.
Especially in a
parallel interferer
scenario. The
reduction in the
interference level is a
function of the
number of chirps.
6
Digital Beam
Forming
Place a notch at the direction of
the interferer ‘adaptively’. This is
done by applying a notch filter to
the receiver array before
processing.
Yes.
May not work well if
there are only a
limited number of
receivers. Also, the
DoA of the aggressor
needs to be
estimated a priori.
7
Detect
interference
and change
timing of
transmit chirp
or frames
If an interferer is detected, avoid
it, either in frequency or in time.
Essentially
–
frequency/time
hopping.
Yes.
Possibly the most
useful technique.
Reasonably simple to
implement.
8
Specific
polarization of
the antennas
Use horizontal polarization for a
certain set of antennas, and
vertical polarization for another
Needs antenna
designers
Useful
–
but only
two different options
are available. Also,
increased complexity