Automotive Radar Interference Test dedicated to ETSI TG SRR · 2018. 2. 13. · Automotive Radar Interference Test dedicated to ETSI TG SRR. Test setup with multiplier 2 Interference

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]