Continuous wave doppler system with suppression of ground clutte

Details Continuous wave doppler system with suppression of ground clutte Continuous wave doppler system with suppression of ground clutte

1998-09-08

2000-10-24

Gregory, Bernarr E.

Communications: directive radio wave systems and devices (e.g.,

Clutter elimination

342104, 342118, 342189, 342195, 342196, 342378, G01S 1300, G01S 7493, G01S 7536

Patent

active

061374393

ABSTRACT:
In a continuous wave Doppler system in which a fixed transmitter transmits a continuous wave signal to be reflected by moving targets and by fixed structure, an aircraft receives the reflective signals at two spaced apart antennas. The signals reflected from moving targets are distinguished from ground clutter reflected from fixed structure by the phase difference between the Doppler signals receive by the two antennas. The signals reflected from moving targets are distinguished from the ground clutter in response to the phase difference between the Doppler signals received by the two antennas being not equal to a phase difference value determined to be the phase difference for clutter signals. The phase difference value for clutter signals is determined from a function expressing the phase difference value as a linear variation with the Doppler frequency of the signals.

REFERENCES:
patent: 3594794 (1971-07-01), Halpern
patent: 3706989 (1972-12-01), Taylor, Jr.
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patent: 4048637 (1977-09-01), Jacomini
patent: 4121209 (1978-10-01), ap Rhys
patent: 4746924 (1988-05-01), Lightfoot
patent: 4876547 (1989-10-01), Franco
patent: 5418534 (1995-05-01), Schmitt
patent: 5485157 (1996-01-01), Long

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