Communications: directive radio wave systems and devices (e.g. – With particular circuit – With recording
Patent
1991-09-19
1992-12-08
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
With recording
342 25, G01S 1390
Patent
active
051701715
ABSTRACT:
Synthetic aperture radar data is used in conjunction with altimeter data to produce a terrain map corrected for platform roll angle. The technique uses two synthetic radar antennas and a ranging altimeter placed on an aircraft. The aircraft is moved in a set of substantially parallel flight paths where each flight is directly over the strip of terrain viewed by the synthetic aperture radar of an adjacent flight. During each flight the at least one antenna repeatedly transmits radar signals whose return echoes are received by both the first and second antennas. Conventional synthetic aperture radar processing yields a terrain map uncorrected for roll angle. The uncorrected terrain map data from one flight are compared with the altimeter data taken during an adjacent flight. This permits the altimeter data to be used to determine the roll angle when the corresponding synthetic radar data was taken. This roll angle measure is then used to correct the height and ground range of nearby points in the uncorrected terrain map. The result is a terrain map corrected for roll angle in a manner more accurate than can be obtained by direct measurement of the roll angle.
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Environmental research Institute of Michigan
Sotomayor John B.
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