This book is a comprehensive and modern textbook for courses in radar systems and technology at the graduate student level; a professional training textbook for formal in-house courses for new hires; a reference for ongoing study following a radar short course; and a self-study and professional reference book. The book focuses on four key areas, including basic, radar signal phenomenology, descriptions of all major subsystems of modern radars, and signal and data processing basics. While several established books address introductory radar systems, this book differs from these in its breadth of coverage, its emphasis on current methods (without losing sight of bedrock principles), and its adoption of an appropriate level of quantitative rigor for the intended audience of students and new professional hires.