Radar Pulse Compression Using Frequency Modulated Signal

Abstract

Range resolution for given radar can be improved by using very short pulses. But utilizing short pulses decreases the average transmitted power. To solve these problems pulse compression technique is used. It consists of two types of correlation process: matched filtering and stretch processing. Generally, we use matched filtering for narrowband signal and stretch processing for wideband signals. LFM signal is used in both the process as its bandwidth is independent of its pulse width. In this thesis we have analyzed two pulse compression technique and effect of time bandwidth product, Doppler shift on LFM signal passed through different windows. In radar masking effect is observed due to hiding of the far target’s weak echo by near target’s strong echo. Its removal is done by subtracting a replica of nearby target echo from the received signal. Matched filtering and stretch processing methods are used for this purpose.