Survivable ground base sensor

Claim 1

A survivable ground base sensor apparatus comprising in combination: a plurality of radiating elements encased in a first hardened enclosure means, each of said plurality of radiating elements cooperating to form a steerable subarray means, a predetermined number of said subarray means are arranged in a predetermined geometric configuration to form a phased-array radar system, each subarray means being spaced at least ten nautical miles from each other, said first hardened enclosure means being located above ground, and a plurality of electronics means each encased in a second hardened enclosure means, said plurality of second hardened enclosure means being located below ground, each of said plurality of electronic means operatively connected to its corresponding subarray means, each subarray means transmits a single pulse at a different frequency in time sequence that adds coherently to form a beam with a predetermined azimuth and range, the time of transmission is adjusted so that all of the n pulses arrive at a target in time coincidence, when a target is at this range and azimuth, n time coincident pulses are reflected back to each subarray means, each subarray means utilizing a receiver that contains n separate channels tuned to the n frequencies that are transmitted by each of said subarrays means, n is defined as a positive integer greater than one, each of said subarray means comprises a self-contained, small phased array radar means, said electronic means receiving other signal returns and performing non-coherently time-delay processing of all the target return signals to perform target detection.