Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1985-11-20
1988-05-24
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
342159, 342424, 455 62, G01S 302
Patent
active
047469242
ABSTRACT:
The positions of a non-cooperative emitter (illuminator) and reflector (target) relative to a receiver of electromagnetic energy, which neither directly nor indirectly controls the illuminator, is determined utilizing emissions received directly from the illuminator as well as reflected emissions from the target. A range R.sub.I between the receiver and the non-cooperative illuminator is determined by measuring the time difference between receiving the reflected signals at a pair of interferometer antennas located at the wing tips of a receiver aircraft. Calculation of the location of the target is accomplished by utilizing range R.sub.I, as well as a time differential .DELTA.t between the receipt of the reflected signals at the interferometer antennas and the receipt of a corresponding direct signals at a radar antenna located at the aircraft. In the event there is clutter in the reflected signal which hinders the determination of the time differential .DELTA.t, clutter processing is performed utilizing the direct signals as a coherent reference and by cross-correlating the direct and reflected signals. The determination of the bearing of the target and the illuminator relative to the receiver is accomplished by an amplitude comparison of the signals received at multiple ports of a multiple beamed phased array radar antenna. The bearing information together with the range and time differential is processed to provide the necessary commands for generating a visual display of the positions of target and illuminator relative to the receiver.
REFERENCES:
patent: 3140443 (1964-07-01), Wimberly
patent: 3475685 (1969-10-01), Covill
patent: 3812493 (1974-05-01), Afendykiw et al.
patent: 4549311 (1985-10-01), McLaughlin
Blum Theodore M.
Cain David
The Boeing Company
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