Boots – shoes – and leggings
Patent
1980-10-09
1983-02-01
Gruber, Felix D.
Boots, shoes, and leggings
250203R, 343 5CM, 343100CL, 364861, G01S 1390, G06G 766
Patent
active
043719465
ABSTRACT:
A method and apparatus for correcting doppler shifts in synthetic aperture radar data. More particularly, in an optical correlator (10) for synthetic aperture radar data having a means for directing a laser beam (22) at a signal film (12) having radar return pulse intensity information recorded thereon, a resultant laser beam (32) then passing through a range telescope (34), an azimuth telescope (38), and a Fourier transform filter (36) located between the range and azimuth telescopes, thereby forming an image for recordation on an image film (40), a compensation means for doppler shift in the radar return pulse intensity information includes a beam splitter (46) for reflecting the modulated laser beam, after having passed through the Fourier transform filter (36), to a detection screen (48) having two photodiodes (66 and 68) mounted thereon. The photodiodes are positioned on each side of the Gaussian distribution of the Fourier transform spectrum reflected by the beam splitter (46). Doppler shifts in the synthetic aperture radar data are detected by a shifting of the Gaussian distribution curve in one direction or the other, thus resulting in unequal light level intensities at the two photodetectors (66 and 68). Control electronics (52) are disclosed for processing this unequal light level intensity and controlling appropriate optical elements in the optical correlator in order to compensate for the doppler shift. Control is effected until the light level intensities at the two photodetectors are again equal.
REFERENCES:
patent: 3435232 (1969-03-01), Sorensen
patent: 3470377 (1969-09-01), Le Febre et al.
patent: 3560973 (1971-02-01), Kazel
patent: 3715599 (1973-02-01), Marcy
patent: 3905031 (1975-09-01), McCord
patent: 3950747 (1976-04-01), Waddoups
patent: 4054878 (1977-10-01), Diehl
patent: 4099249 (1978-07-01), Casasent
patent: 4129775 (1978-12-01), O'Meara
patent: 4156875 (1979-05-01), Keane et al.
Bicknell Thomas J.
Constantinides Nicholas J.
Gruber Felix D.
Manning John
McCaul Paul
Mott Monte
The United States of America as represented by the Administrator
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