The state-of-the-art of radar detection and radar design is reviewed with emphasis on the total environment, including the unwanted reflections from the sea, land areas, precipitation, and chaff, as well as thermal noise and jamming. Topics discussed include radar range performance computations, statistical relationships for various detection processes, radar targets, and signal processing concepts and waveform design. The discussion also covers moving target indicators, environmental limitations of CW radars, phase-coding techniques, hybrid processors, meteorological radars, and system performance analysis.