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Abstract
The development of an active sonar system requires knowledge of the properties of the waveforms transmitted by that system. The choice of waveform will determine the ability of the system to resolve targets in range and Doppler, and will also impact the detection capabilities of the system. Modulating the frequency or the amplitude of the transmitted waveform will result in an increased time-bandwidth product. Amplitude modulation, however, results in degradation of power efficiency, so it is more common to use frequency modulated signals. Active sonar performance also depends on reverberation rejection, and thus on pulse design.. This paper is based on matlab simulations, and primarily focuses on the effect of choice of modulating frequency of sinusoidal frequency modulated signals (SFM) on their performance in active sonar systems. The ability of SFM to reject reverberation and avoid mutual interference will also be discussed.
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Notes on contributors
C.K. Sunith
C.K. Sunith received his M Tech degree in Electronics from National Institute of Technology, Calicut. Presently he is working as Senior Lecturer in Department of Electronics and Communication Engineering, Model Engineering College, Thrikkakara, Kochi-21. He is an Associate Member of IETE, Associate Member of Institution of Engineers (India), and a Life Member of ISTE, SSI and Photonics Society of India. He has contributed several articles to regional IT Magazines and national magazines like Electronics For You, Science Reporter and Science India.