Patent
Miniature radio-acoustic sounding system for low altitude wind and precipitation measurements
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TLDR
In this article, a radio-acoustic sounding system for providing wind measurements at altitudes of 100 meters or less is presented, where the frequency of the audio pulse is selected to have a wavelength that is one-half the wavelength of the electromagnetic energy transmitted by the antenna or antennas.Abstract:
The present invention is directed to a radio-acoustic sounding system for providing wind measurements at altitudes of 100 meters or less. Wind measurements are obtained by transmitting a pulse of audio frequency energy through one or more volumes corresponding to the coverage area of one or more radio frequency transceivers. The frequency of the audio pulse is selected to have a wavelength that is one-half the wavelength of the electromagnetic energy transmitted by the antenna or antennas. By monitoring a return radio frequency signal at selected times following the transmission of the audio pulse, wind data is obtained at selected altitudes. Wind speed and direction can be obtained by observing the Doppler frequency shift of return radio frequency signals, or by observing the amplitude of the return radio frequency signals. In accordance with an embodiment of the present invention, precipitation measurements may be made by transmitting a radio frequency signal at the same radio frequency as is used in connection with wind measurements, and observing return radio frequency signals.read more
Citations
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References
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Book
Remote Sensing of the Lower Atmosphere: An Introduction
TL;DR: In this article, the authors provide a basic understanding of the important reactions between electromagnetic radiation and matter, and use examples drawn from remote sensing to illustrate these interactions as they occur in the Earth's atmosphere.
Patent
System for measuring height distributions of atmospheric temperature, wind direction and wind speed
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Atmospheric remote sensing instrument system
TL;DR: In this article, a system of atmospheric remote sensing instruments that utilize a common phased-array acoustic antenna so as to take temperature and wind measurements over a wide range of altitudes is described.
Patent
Pulse coherent transponder with precision frequency offset
Russell R. Yost,Eric J. Carlson +1 more
TL;DR: In this paper, a radar reply transponder for use with existing radar tracking systems is proposed, where a reply pulse is generated and trasmitted in response to an associated interrogation pulse.
PatentDOI
Radio acoustic sounding system for remotely determining atmospheric temperature profiles
Keith R. Peterman,Don T. Batson +1 more
TL;DR: In this paper, a radio acoustic sounding system for detecting temperature profiles in the atmosphere, including an acoustic transmitting antenna for transmitting an acoustic signal, a receiving antenna for receiving a reflection of the RF signal from the acoustic signal; a RF subsystem including a RF sweep generator for producing a frequency modulated, continuous wave (FM-CW) RF signal, and a homodyne receiver for receiving the reflected RF signal and for producing an output audio signal in response thereto, was presented.