Target detection by radar using linear frequency modulation

Abstract

Range Detection is the maximum distance across which a target can detect a target. Range Resolution is the ability of the Radar to distinguish between two closely spaced targets. Range Resolution can be enhanced by using short duration pulses. But using short duration pulses results in less Range Detection. To overcome these shortcomings pulse compression techniques are used. We use a Linear Frequency Modulated (LFM) Wave for pulse compression purposes as it gives a wide operating bandwidth. It involves two types of correlation processes: matched filter processing and stretch processing. Matched Filter is used for narrow-band and Stretch Processor is used for wide-band signals. In this thesis we have analyzed both these processes and the effects of Time- Bandwidth Product, change in Doppler Frequency and effect of different kinds of windows on the LFM wave. Also masking effect is observed on the echo of a distant target due to the echo of a nearby target. The various methods to remove the masking effect are inspected.