Abstract :
Nowadays
speed governor is a common term of which almost everyone is familiar with.
Speed governor is just a device that alerts the driver and decrease the speed
of the vehicle when the vehicle speed exceeds the reference value entered in
the speed governor. This thought i.e. whether this speed governor which merely
controls the speed of a vehicle is worth in a fast moving society of ours ended
up in an alternative for speed governor that can take decisions according to
varying environmental and driver behavior.
Over view Active safety systems are gradually becoming practical with
advance in environment sensing and vehicle control technologies. On the other hand
analyses of driver mistakes make mistakes in the cognition of their external world
and judging the safe or not safe. A total 60% of all rear and almost 30% of
head-on collision could have been avoided if the driver reacted mere a half a
second early. So in this paper we are focusing on driver aids which combines
both environment senses and driver monitoring
system. The
development of driver supporting system that address the mistakes made by
drivers requires Environmental sensors, driver monitoring system and a brake
assist system to ordinate vehicle control.
Environmental Sensors
The
environmental sensor system consists of equipments that make the vehicle aware
of its surroundings. In general it consists of radars, infrared night vision
systems, high resolution digital video for medium
distance
observation, and ultra sonic systems for ultra short monitoring. In our system
we are using a radar system and a laser based tracking system as environmental
sensors
The Radar
It enables
the vehicle to acquire data using radar technology. The most common frequency
used is at the range of 77 GHz. Even though high resolution radars are
preferred since it enables better tracking of both stationary and moving
objects. These radars can acquire data like the distance of the object from our
vehicle and the relative speed of the object being
tracked.
The common
technology now in use is the radar using frequency of 77 GHz. But it is not
much efficient when tracking the stationary object. So it is preferred to use a
high frequency radar system which can be effectively used to track both the moving and
stationary objects.
The Laser
Scanner
Even though
the radar system is highly effective for vehicle tracking, it fails when
pedestrian safety is concerned. For pedestrian tracking we use a laser based
scanner which uses a laser beam and its reflections to calculate the size, speed,
direction of motion and the position of the object. it can also detect the
traffic sign boards and the reflection posts.
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