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Oceanographic and meteorological data
| Details |
Inventors: Anderson, Stuart J.;
Assignee: The Commonwealth of Australia, c/o The Secretary, Department of Defence (Canberra, AU)
Primary Examiner: Pihulic; Daniel T.
Assistant Examiner:
Attorney, Agent or Firm: Cushman Darby & Cushman
A method of obtaining oceanographic and meteorological data from high frequency radar spectral information including the steps of transmitting a plurality of signals to a remote geographic location, recording signals backscattered from the said location, generating a family of Doppler clutter spectra from the recorded backscattered signal and analyzing the Doppler clutter spectra in terms of a model or models to generate oceanographic and meteorological data estimates. The Doppler spectra are categorized according to Suitability for Deatiled Analysis (SDA). The SDA takes account of the clutter-to-noise ratio in the spectrum, the amplitudes of the Bragg-lines, multimode propagation, spectral broadening and other spectral parameters. Spectra with a low SDA are inappropriate for extracting directional wave spectrum estimates of reasonable accuracy but are useful for obtaining wind direction estimates. Spectra with a high SDA are capable of being inverted to provide good quality estimates of the extended directional wave spectrum. |
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DETAILED DESCRIPTION It is an objective of this invention to provide a scheme for the automatic extraction of oceanographic and meteorological information from HF radio waves scattered from the sea surface.
There is a growing demand for high quality oceanographic information by a host of agencies, whose interests range from theoretical studies of the transport of energy and momentum across the air-sea interface to the needs of engineers designing offshore structures.
Some of these users require near real-time information and forecasts, as for ship routing, tropical cyclone tracking, and scheduling of off-loading activities at oil drilling platforms.
There is also a continuing need for synoptic monitoring of sea conditions to provide calibration information for the radar itself.
These tasks have the common need to look in a particular place at a particular time, though to be consistent with the resolution of the radar and wave development times, a time margin of two or three hours usually suffices to maintain a globally consistent `real-time` picture.
At the other extreme, there is keen interest in the accumulation of regional wave climatologies and measurements of large scale events such as the summer monsoon, which may contribute to global environmental research.
In this case, the decision of where and when to gather data is relatively unconstrained and the radar can await the occurrence of good propagation conditions to a given area before estimating the wave field parameters there.
A further objective of this invention is to estimate S(k) from the measured Doppler spectrum of the scattered radio waves.
The extraction of this information is often frustrated by various types of signal corruption which occur during propagation through the ionosphere.
In particular, directional wave spectra can be determined only when signal degradation is not significant.
It is another objective of this invention to provide a new inversion technique for the estimation of the two-dimensional directional wave spectrum which combines computational efficiency with the generality of a non-parametric approach
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Cell Phones 
