cars. But now, thanks to technology evolution and re-
duced costs, they are ;nding their way into mid-range
and economy vehicles. Consumer demand for ADAS is
high, and governments worldwide are considering ben-
with automatic emergency braking (AEB) systems.
lions of cars on the road today are already out;tted with
radar sensors, as the cost has dropped over the years.
Automotive radar is a key sensor of advanced driver
assistance systems (ADAS). Other sensors include light
detection and ranging (LiDAR), ultrasonic sensors and
camera vision systems. Compared to radar, a LiDAR today offers higher resolution and can build a 3D image
of the target. However, it is very expensive and offers
limited use in bad weather and at night, plus it covers
a shorter range. Figure 7 shows a typical ADAS system
consisting of various types of sensors.
The rapid evolution of ADAS is paving the path to
fully autonomous vehicles. At one time, ADAS systems,
or parts thereof, were the domain of high-end luxury
Fig. 6 Timeline of automotive radar history.
First blind-spot detection
(BSD) radar at 16 GHz
presented at Bendix Labs
in South;eld, Mich.
Radar-based 24 GHz collision
warning system reduces
accidents by 21% for
harmonized use of
79 GHz band for
Field trials of 60 GHz
systems on Jo-Shin-Etsu
Highway in Japan
National Highway Traf;c Safety
Administration announces that all
automakers will supply
collision avoidance by 2022
First road testing vehicles
using 35 GHz radar for
automatic cruise control
System uses 77 GHz band
PLUS uses 24 GHz radar for
short range, 77 GHz
band for long range
Delphi ships 1 millionth 77 GHz
electronically scanning radar
Fig. 7 Advanced Driver Assistance System sensors.
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