Dynamic Spectrum Allocation in Cognitive Radar: A Brief Overview

The use of mobile phones and wireless devices will face spectrum scarcity issues in near future, because of the explosive growth of wireless applications. Spectrum congestion and interference during communication are the upcoming challenges in cognitive radar, so the researchers are trying to put their enormous efforts towards mitigating the spectrum scarcity issues. According to the literature review, cognitive radar is a recently developed, reliable technology that utilizes the under-utilized spectrum using dynamic spectrum allocation techniques. Some concise reviews have been done for spectrum allocation and spectral existence between radar and cognitive radio using different machine-learning approaches, such as deep learning, and evolutionary computing. The contribution of this investigation is represented in tabular form for easy understanding of the research direction. Future research scopes, challenges, and hardware design for cognitive radar using dynamic spectrum access techniques are also provided in this study. This paper also has discussed various applications of cognitive radar, such as guiding military weapons in missile systems, controlling air traffic in poor weather conditions, remote sensing, and guiding space vehicles for a safe landing.