Abstract:
RADAR, which is an abbreviation for Radio Detection And Ranging, is an
electromagnetic system for the detection and location of reflecting objects such as
aircraft, ships, spacecraft, vehicles, people and natural environment. Delectability of an
object or target depends on range resolution of reflected signal from the object or target.
The range resolution of Radar is defined as the minimum separation (in range) of two
targets or equal cross section that can be resolved as separate targets. It is determined by
the bandwidth of the reflected signal. As spectral bandwidth of a pulse is inversely
proportional to its width, the bandwidth of a short pulse is large. Range resolution for
given radar can be significantly improved by using very short pulses. As short pulses
decreases the average transmitted power, pulse compression allows us to achieve the
average transmitted power of a relatively long pulse, while obtaining the range
resolution corresponding to a short pulse.
Pulse compression technique is generally used in Radar system in order to improve the
target detection and range resolution. A Problem arises in pulse compression technique
because of masking of small targets by the range side lobes of large nearby targets.
Another problem is for multiple targets-main lobes of the compressed pulses overlap
each other.
This thesis has proposed a technique to suppress the side lobes and eradicate the
problem of overlapping by comparing different pulse compression techniques. In the
simulation, we compared the result of analog pulse compression output by applying
different weighting function. For multiple targets we compare the output of stretch
processor technique with Barker Codes of different lengths. It is revealed that Barker
Code of length thirteen (𝐵13) is better both for reduction of side lobes and detecting
multiple targets.
Description:
We are thankful to Almighty Allah for giving us the course and enthusiasm to complete
the thesis work. Our heartiest gratitude, profound indebtedness and deep respect go to
our supervisor Gp Capt Dr. Md Hossam-E-Haider, Senior Instructor, Department of
Electrical, Electronic and Communication Engineering (EECE), Military Institute of
Science and Technology (MIST), Dhaka, Bangladesh, for his constant supervision,
affectionate guidance and great encouragement and motivation. His keen interest on the
topic and valuable advices throughout the study was of great help in completing our
thesis work.
