Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1976-11-24
1978-07-18
Wilbur, Maynard R.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 5CM, 343 5W, 324 77K, G01S 902, G01S 960
Patent
active
041018915
ABSTRACT:
Apparatus for obtaining significant height information of ocean waves, or peaks of rough terrain utilizing means for compressing the radar signal over different widths of the available chirp or Doppler bandwidths, and means for cross-correlating one of these images with each of the others, where the center frequencies of the images have a spacing .DELTA.f.sub.rO. Upon plotting a fixed (e.g., zero) component of the cross-correlation values R.sup.E (.DELTA.f.sub.rO) as the spacing is increased over some empirically determined range, such as 0 to 1 MHz, the system is calibrated. Thereafter to measure height with the system, a spacing value is selected and a cross-correlation value is determined between two intensity images at a selected frequency spacing, such as 0.1 MHz. The measured height is the slope of the cross-correlation value determined to the spacing value used. Both electronic and optical radar signal data compressors and cross-correlations are disclosed for implementation of the system.
REFERENCES:
patent: 3560973 (1971-02-01), Kazel
patent: 3612658 (1971-10-01), Slaymaker
IEEE Transactions on Antennas and Prop., vol. AP-21, No. 5, Sep. 1973, D. E. Weissman, "Two Frequency Radar Interferometry Applied to ...Ocean Wave Height".
Conference Proceedings-3rd National Convention on Military Electronics, Jun. 1959, Cutrona et al., "Data Processing by Optical Techniques".
Proceedings of the IEEE, vol. 54, No. 8, Aug. 1968, L. J. Cutrona et al., "On the Application of Coherent Optical Processing Techniques to Synthetic-Aperture Radar".
Fletcher James C. Administrator of the National Aeronautics and Space
Jain Atul
Goodwin Lawrence
Manning John R.
McCaul Paul F.
Mott Monte F.
Wilbur Maynard R.
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