Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1977-08-08
1979-10-23
Wilbur, Maynard R.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 9R, 73189, 343 77, G01S 944
Patent
active
041722558
ABSTRACT:
A system for radar remote sensing of near surface ocean currents in coastal regions. The system employs a pair of low power, transportable high frequency radar units to scatter signals from the shore off to the ocean waves. Underlying surface currents impart a slight change in velocity to the ocean waves which is detected by the radar units. Each radar unit can determine the angular direction of arrival of the radar echo signals by comparing the phase of the signals received at three short antennas on the shore. Signals scattered from the same point on the ocean by each of the two geographically separated radar units are used to construct a complete current vector for that point. The radar pair takes simultaneous measurements over an ocean area with a predetermined grid pattern. Vectors are constructed for each square section of the grid, and a map of the near surface current field is output in real-time by an on-site minicomputer.
REFERENCES:
patent: 3889533 (1975-06-01), Balser
patent: 3949605 (1976-04-01), Stallworth et al.
patent: 4053886 (1977-10-01), Wright et al.
"HF Radio Measurements of Surface Currents", by Stewart and Joy, Deep-Sea Research, 1974, vol. 21, pp. 1039-1049, Great Britain.
Barrick et al., "Sea Backscatter at HF . . .", Proceedings of the IEEE, vol. 62, No. 6, Jun. 1974, pp. 673-680.
Barrick Donald E.
Evans Michael W.
Gardiner Donald A.
Goodwin Lawrence
Sadowsky Gersten
The United States of America as represented by the Secretary of
Wilbur Maynard R.
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