Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1983-02-10
1985-11-05
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 5CD, 343 5VQ, 367 88, G01S 1390
Patent
active
045517240
ABSTRACT:
By using two SAR antennas spaced a known distance, B, and oriented at substantially the same look angle to illuminate the same target area, pixel data from the two antennas may be compared in phase to determine a difference .DELTA..phi. from which a slant angle .theta. is determined for each pixel point from an equation .DELTA..phi.=(2.pi.B/.lambda.)sin(.theta.-.alpha.), where .lambda. is the radar wavelength and .alpha. is the roll angle of the aircraft. The height, h, of each pixel point from the aircraft is determined from the equation h=R cos .theta., and from the known altitude, a, of the aircraft above sea level, the altitude (elevation), a', of each point is determined from the difference a-h. This elevation data may be displayed with the SAR image by, for example, quantizing the elevation at increments of 100 feet starting at sea level, and color coding pixels of the same quantized elevation. The distance, d, of each pixel from the ground track of the aircraft used for the display may be determined more accurately from the equation d=R sin .theta..
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"Two Frequency Radar Interferometry Applied to the Measurement of Ocean Wave Height," IEEE Transactons on Antennas and Propagation, vol. AP-21, No. 5, Sep. 1973, pp. 649-656.
Caro Edward R.
Goldstein Richard M.
Wu Chialin
Jones Thomas H.
Kaiser K. R.
Manning John R.
McCaul Paul F.
The United States of America as represented by the Administrator
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