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HDMS IP6K9K RADAR
5. Appendix
Interference Mitigation For AWR1443 RADAR Device
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References : swra662_Interference Mitigation For AWRIWR Devices
http://www.ti.com/lit/an/swra662/swra662.pdf
1
Types of Interference in FMCW RADAR
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Crossing Interference
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Parallel Interference
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Between Crossing and Parallel Interference
2
Interference Avoidance
NO
Technique
CFAR –based
1
mitigation
Dithering in
2
time domain.
Direction
specific
3
predefined
frequency band
separation.
Detect
interference
4
and repair Rx
results
Method
Increase the CFAR thresholds
accounting for the interference.
This decreases the detection
sensitivity but avoids spurious
sidelobes.
Dithering the idle time (time
between chirps) or the interframe
time (time between frames). Since
this dither is different for the
Aggressor and the Victim, the
probability of interference on more
than one chirp is reduced.
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.
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'..
Implementable in
TI device.
Yes. The detection
threshold is user
programmable.
Yes. A near infinite
variation is possible on
the 'idle time'. Frames
can be generated with
dithering as well
(software control).
Yes.
Yes. IWR1443 devices
provide side channel
information (called
chirp quality) to aid in
narrowing down the
region of interference.
Usefulness and
simplicity
Debatable usefulness.
Very simple to
implement.
Very Useful. specially in
a parallel interferer
scenario. Simple to
implement
Debatable usefulness
Very simple to
implement and process.
Very Useful.
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