Radio acoustic sounding system for remotely determining atmosphe

Details Radio acoustic sounding system for remotely determining atmosphe Radio acoustic sounding system for remotely determining atmosphe

1991-02-06

1992-06-16

Barron, Jr., Gilberto

Communications: directive radio wave systems and devices (e.g.,

Radar for meteorological use

342 52, 342196, G01S 1395, G01S 7295

Patent

active

051228050

ABSTRACT:
A radio acoustic sounding system for detecting temperature profiles in the atmosphere, includes an acoustic transmitting antenna for transmitting an acoustic signal; a RF transmitting antenna for transmitting a RF signal used to detect the transmitted 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, a homodyne receiver for receiving the reflected RF signal and for producing an output audio signal in response thereto, and a distribution unit for supplying the FM-CW RF signal from the RF sweep generator to the RF transmitting antenna for transmission thereby, and to the homodyne receiver as a local oscillation signal so that the received reflected RF signal is phase coherent with the transmitted FM-CW RF signal; a programmable filter for filtering out undesirable frequency components of the output audio signal from the homodyne receiver; an analog-to-digital converter for digitally converting said deliberately aliasing the filtered output audio signal under a controlled set of radar and digital sampling parameters; a central processing unit for determining the temperature profile of the atmosphere in response to the filtered and aliased output RF signal; an array processor for spectrally analyzing the digitized signal from the analog-to-digital converter via a Fourier transform so that the central processing unit can analyze the signal; and an acoustic sweep generator for supplying a FM-CW acoustic signal to the acoustic transmitting antenna, in response to the central processing unit.

REFERENCES:
patent: 3975734 (1976-08-01), Payne
patent: 4268828 (1981-05-01), Cribbs et al.
patent: 4370652 (1983-01-01), Lucchi
patent: 4481517 (1984-11-01), Brown
"Temperature and Wind Profiles from Radar Wind Profilers Equipped with Acoustic Sources", G. Peters, Meterol. Rasch., vol. 42, pp. 152-154, Jun. 1990.
"Ratio Acoustic Sounding of the Atmosphere Using an FM-CW Radar", G. Peters, et al., RADIO SCI., vol. 23, No. 4, 1988, pp. 640-646.
"A Combined RAS-/Radar-System", G. Peters et al., pp. 247 and 248 (date and publication unknown).

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