Title: FM/CW surveillance radar system with range gating

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Abstract: A single FM/CW radar antenna and accompanying electronics are positioned within a space that is to be guarded. A moving object within the space under surveillance produces a doppler frequency shift in the echo return signal which return signal is, in turn, analyzed for signal content. Through FM and range gating the return signal analysis is selectively adjustable for moving target size and range such that moving targets of below minimum size and/or beyond maximum range are not detected as hostile objects while moving targets of or above minimum size and/or at or within maximum range are detected as hostile objects. Range gating is selectively adjustable to produce an alarm signal by selected size hostile objects within a predetermined range of detection, e.g., of 300 feet, such as a man crawling through the radar beam at a range of 300 feet within an enclosed fenced-in area while not producing an alarm signal by relatively large non-hostile objects without the range of detection, such as a large truck moving through the radar beam at a range of 330 feet outside the enclosing fence or by relatively small non-hostile objects within the range of detection, such as a guard dog moving through the radar beam at a range of 270 feet inside the enclosing fence.


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