automotive radar interference test dedicated to etsi tg srr · 2018. 2. 13. · automotive radar...
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Dr. Steffen Heuel
Technology Manager
Test & Measurement Division
Rohde & Schwarz
Automotive Radar Interference Test
dedicated to ETSI TG SRR
Test setup with multiplier
2
Interference
SignalVector Signal Generator
Radar Echo Generator
TX/RX/Cntrl Signals
SMZ Multiplier
ATS-1000 QuickStep
Control and data collection
Radar data output
Positioner Control
RUT
Test Setup with upconverter
3
Interference
Signal
Vector Signal Generator
Radar Echo Generator
TX/RX/Cntrl Signals
ATS-1000 QuickStep
Control and data collection
Radar data output
RUT
Positioner Control
Interference Signal
Setup
R&S®ATS1000
Shielded Chamber
R&S®SMW200A Vector Signal Generator
R&S®AREG
Automotive Radar Echo Generator
Control, data collection
Radarsensor
4
Signal Generation Possibilities: Multiplication
5
RF: 12.6 - 13.5GHz Radar
sensor
RF: 76 … 81 GHz
+
Vector Signal
Generator
2 GHz BW
Frequency
multiplier
Commercial off the shelf
FM / PM signals possible
Bandwidth scales
Arbitrary signals impossible
Signal Generation Possibilities: Mixing
6
Generate
interference
signal,
or the entire RF
environment
in software
Replay the signal
with a vector
signal generator
Upconvert to
E-band
Test your
radar sensor
IF: 10 … 15 GHz
LO: 11 GHzRadar
sensor
RF: 76 … 81 GHz
+
E-Band
Upconverter
Vector Signal
Generator
2 GHz BW
Waveform design
ı Using Pulse Sequencer software to define
arbitrary signals, e.g.
CW
FMCW
FSK
MFSK
CS
OFDM
PN
Coded signals
Noise
….
7
Test automation
ı Each signal is load into the signal
generator and replayed
ı Different power levels of interference
ı Raw data collection of the radar
sensor
8
Data processing
ı The raw data is processed with and without interference cancellation methods
ı Comparison of the detected targets SNR
without interference there is a certain SNR present
In different interference scenarios the SNR changes (usually it gets lower)
Using mitigation algorithms the interference can be healed and the SNR increases again
9
Range [m]
0 20 40 60 80 100 120 140 160 180 200
Leve
l[dB
V]
-140
-130
-120
-110
-100
-90
-80
-70Comparison of Interferences
FMCW random
FMCW Triggered
No Interference
Measurement Results
FMCW with slightly different slope
but within the RX bandwidth
worst case, but the probabiltiy of
interference is low (today)
CW Interference
Interfence is strong, but could
probably be detected easily.
OFDM Interference
strong noise like interference,
probably hard to detect
Measurements done with
an E-band upconverter
Range [m]
0 20 40 60 80 100 120 140 160 180 200
Leve
l[dB
V]
-140
-130
-120
-110
-100
-90
-80
-70Comparison of Interferences
CW-mid
CW-left
FMCW random
FMCW Triggered
No Interference
Range [m]
0 20 40 60 80 100 120 140 160 180 200
Leve
l[dB
V]
-140
-130
-120
-110
-100
-90
-80
-70Comparison of Interferences
CW-mid
CW-left
FMCW random
FMCW Triggered
No Interference
OFDM
10
Appendix
11
Interference: Radar echo’s and time aligned chirps
12
Received Echo from target transmit
Interference
target
Range [m] / Freq bin
Amplitude
Interference = ghost targett [ms]
f(t) [Hz]
f(t) [Hz]
t [ms]
IF-side
RF-side
fb
fb
SNR
Interference: Other RF signals within the bandwidth
13
Received Echo from target transmit
Amplitude
t [ms]
RF-side
CW Interference
noise level risef(t) [Hz]
t [ms]
IF-side
fbRange [m] / Freq bin
fb
target
SNR
f(t) [Hz]
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