This is a standard reference for FAA and military air traffic control engineers and maintenance technicians focused on ground-based radar systems. With the evolution and increasing sophistication of modern radar systems, now more than ever a single-source reference is needed that contains simply understandable information on MTI, MTD, and air traffic control radar beacon systems. There is a downside to the drive away from knowledge-based problem solving -- massive increases in costs and waste inherent in the idea of lowest replaceable units. Fewer technicians are expected to manage more systems while knowing less about their equipment. This unique training and reference text will not only provide answers for day-to-day tasks, it will also help allay cost increases and waste.