History of Monopulse Radar in the US

The history of development of monopulse radar in the US is reviewed herein. Significant techniques that permitted monopulse tracking radars to achieve accurate tracking with high efficiency are discussed, including sum-and-difference antenna feed networks, multi-horn and multi-mode feeds, precision mechanical pedestals, and space-fed arrays. The discussion concentrates on surface-based radars, but many of the techniques apply to airborne radars and missile seekers developed during the same periods.