Microwave sensing
with an
One-Chip-Radar
Hans Brouwer
2 april 2015
SENSE OF CONTACT
Microwave sensing
MICROWAVE SENSORS offer many possibilities:
- Distance (cm and sub mm accuracy)
- Changes in dielectrical constant
- Speed (Doppler)
- Speed and distance combined (FMCW)
- Angle of Arrival
- Vibrations, change in distance.
- Combinations (object at a distance and movement of that object)
- With 60 GHz (λ=0,5 cm) and 7 GHz bandwidth resolution cm’s
- Fast as the speed of light.
- In harsh enviroments.
- With radar we illuminate the object (as opposed to cameras).
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Example Application Areas
-
Trucks safety
Presence sensing ultrasound replacement
Presence sensing PIR replacement
Presence sensing doors
PDC
Gesture sensing
Industrial levelgauging
Other applications such as speed enforcement, traffic sensing, height
measuring for UAV (drones, (toy and professional) helicopters), overthe-ground speed, .
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Antenna on-silicon: RIC60A
7x7x1.2 mm
0.5 mm pitch
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Module-example (RIC60B)
customer defined radiation pattern
Fan-shaped beam: 70° x 11°
Module size: 32 x 38 mm
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Doppler radar
Fixed
frequency
oscillator
Δf 
2  vobject
c
f RF
amplifier
amplifier
fTX
fRX
Using fRF = 60 GHz, v=10-100 km/hr=2.8-28
m/s
 Δf = 1-11 kHz. OMNIRADAR confidential information
vobject
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frequency
FMCW radar
fswp
f1
t
TX
RX
Tchirp
time
• Triangular frequency modulation
Δ f = fswp* Δt/Tchirp
(many other patterns possible).
• Measures both distance d=(Δf1+Δf2)*Tch/fswp and
speed v=(Δf1-Δf2)*c/(2*fRF).
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Object measurements
Front-side and
back-side of the
bottle are clearly
visible:
resolution = 5 cm.
radar
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Proximity measurement
object
radar
Comparing radar and
laser measurements,
accuracy < 5mm !
(without
super-resolution
techniques)
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Angle-of-arrival
object 2
location of radar
object 1
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OM-DEVKIT60A
 Interface board with USB for dataexchange and power.
 Sensor board with RIC60A, including VCO
characteristics.
 USB cable.
 GUI/Software for programming the RIC60
(SPI).
 Sample code (Matlab) for Doppler- and
FMCW radar.
•
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2,6 M EURO closing on July 2nd 2014
Hans Brouwer
Paul van Zeijl
Henrie van Beusekom
18 Design: Visual Friday
© Omniradar 2013