Survivable ground base sensor

DETAILED DESCRIPTION The present invention utilizes a hardened radar system wherein the transmitter unit has subarray of elements built into a concrete pyramid.
Each subarray transmits a pulse in time sequence that adds coherently in the direction of radiation.
The radar system which operates in the microwave frequency range, utilizes a large number of subarrays that are positioned a large distance apart, typically one to ten miles.
The array is steerable and may be in the form of either a linear array or a circular array.
If one of the antenna arrays is destroyed by a nuclear explosion, the other arrays are able to continue operating since all subarrays of the entire radar system are built into hardened concrete pyramids or steel, semi-hardened, shelters.
These and other advantages, objects and features of the invention will become more apparent after considering the following description taken in conjunction with the illustrative embodiment in the accompanying drawings.