Patent ID: 8330662

Claim:
An antenna array, comprising: a first array of radiator elements; an excitation source connected to at least a first set of the first array radiator elements; a receiver connected to at least a second set of the first array radiator elements; a second array of radiator elements spaced from the first array of radiator elements, the second array comprising a variable phase shifter connected to each of said radiator elements and a switch arranged to connect the phase shifter to either a reflective termination or a load device, so that in a first mode, the phase shifter is connected to the reflective termination and in a second mode the phase shifter is connected to the load device; an array controller configured in a measurement mode to set the phase shifters to the first mode, control the excitation source to radiate energy from said at least a first set of the first array radiator elements so that some of the radiated energy is reflected from said second array of radiator elements back to at least said second set of first array radiator elements, and to process signals from said receiver as a result of said excitation to measure bistatic ranges R ijk through a signal path from a first array radiator “i,” to second array radiator “j,” and to first array radiator “k”.