Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1989-07-18
1990-07-17
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342107, 342109, G01S 502, G01S 352
Patent
active
049424041
ABSTRACT:
A passive doppler differential ranging method for use with respect to an aircraft radar for determining the range, R, of a threat passively, includes the steps of mounting a first receiving antenna and a second receiving antenna on an aircraft and positioning the first and second antennas a known distance, d, apart from each other, and determining the azimuth angle .alpha. of the threat with respect to the aircraft at a first time t.sub.o. A first differential doppler phase shift, .DELTA..phi., between the first and second antennas of a received signal transmitted by the threat at time t.sub.o is then determined. The velocity of the aircraft is measured, and a second differential phase shift, .DELTA..phi..sub.1, between the first and second antennas of a received signal transmitted by the threat at time t.sub.1 is then determined. The differential differential doppler phase shift, .DELTA..DELTA..phi., is determined by subtracting the first differential doppler phase shift from the second differential doppler phase shift, and the range, R, of the threat at time t.sub.1 is then determined. The passive doppler differential ranging system includes two antennas and preferably includes an interferometer which is used to determine the differential doppler phase shift at time t.sub.o.
REFERENCES:
patent: 4158202 (1979-06-01), Hubka et al.
Range-Doppler Imaging with Motion Through Resolution Cells, IEEE Transactions on Aero-Space and Electronic Systems, vol. AES 5, No. 1, Jan. 1969.
F-16 Pulse Doppler Radar (AN/APG66) Performance, IEEE Transactions on Aero-Space and Electronic Systems, vol. AES-19, No. 1, Jan. 1983.
Ail Systems, Inc.
Blum Theodore M.
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