Communications: directive radio wave systems and devices (e.g. – Radar for meteorological use
Reexamination Certificate
2001-03-29
2002-09-10
Tarcza, Thomas H. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Radar for meteorological use
C342S189000, C342S195000, C367S100000
Reexamination Certificate
active
06448923
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a method for estimation of Doppler spectrum, its moments, and polarimetric variables on pulsed weather radars which uses over sampled echo components taken at a rate several times larger than the reciprocal of transmitted pulse length.
Methods that are used to estimate values derived from using remote sensing systems are known. For example, in one such earlier system a radar uses an electronic receiver to receive and convert direction signals derived from an antenna to develop output signals in a predetermined manner. In another earlier invention, a method of resolving range ambiguities and separating overlaid signals in a Doppler radar system is disclosed.
Another prior art method is used to increase the accuracy of ranging measurements between data link systems.
A method for determining Doppler shifts and reflectivity data in sodars uses a high powered sodar pulse consisting of a string of concatenated wavelets, is disclosed in another invention. The reflected portion of the transmission is amplified and digitized as a string of samples of time which correspond to the range from the transmitter.
Still another invention discloses a method for reducing false target echo indications in a pulse Doppler radar having at least two different pulse repetition frequencies during the period in which the main beam of the radar illuminates a target.
DESCRIPTION OF THE PRIOR ART
Methods used to estimate values derived by remote sensing systems are known and disclosed in the prior art. For example, U.S. Pat. No. 3,940,767 to DeLano et al. discloses a radar system that uses an electronic receiver to receive and convert direction signals derived from an antenna to develop output signals in a predetermined manner.
U.S. Pat. No. 6,081,221 to Zrnic et al. discloses a method of resolving range ambiguities and separating overlaid signals in a Doppler radar system.
U.S. Pat. No. 6,087,973 to Rowe et al. discloses a method used to increase the accuracy of ranging measurements between data link systems.
U.S. Pat. No. 6,097,669 to Jordan et al. discloses a method to determine Doppler shifts and reflectivity data from sodars. It uses a high powered sodar pulse consisting of a string of concatenated wavelets. The reflected portion of the transmission is amplified and digitized as a string of samples of time which correspond to the range from the transmitter.
U.S. Pat. No. 6,111,537 to Andersson discloses a method for reducing false target echo indications in a pulse Doppler radar having at least two different pulse repetition frequencies during the period in which the main beam of the radar illuminates a target.
In the present invention a method for estimation of Doppler spectrum, its moments, and polarimetric variables on pulsed weather radars which uses over sampled echo components taken at a rate several times larger than the reciprocal of transmitted pulsed length is disclosed, all as will be detailed in the specification that follows hereafter.
SUMMARY OF THE INVENTION
This invention relates to a method for estimation of Doppler spectrum, its moments, and polarimetric variables on pulsed weather radars which uses over sampled echo components taken at a rate several times larger than the reciprocal of transmitted pulse length.
It is the primary object of the present invention to provide for an improved method for estimating Doppler spectrum, its moments, and polarimetric variables.
Another object is to provide for such a method which operates on over sampled echo components taken at a rate several times larger than the reciprocal of the transmitted pulse length.
These and other objects and advantages of the present invention will become apparent to readers from a consideration of the ensuing description and the accompanying drawings.
REFERENCES:
patent: 3940767 (1976-02-01), DeLano et al.
patent: 5394155 (1995-02-01), Rubin et al.
patent: 5442359 (1995-08-01), Rubin
patent: 5744710 (1998-04-01), Abatzoglou et al.
patent: 6081221 (2000-06-01), Zrnic et al.
patent: 6087973 (2000-07-01), Rowe et al.
patent: 6097669 (2000-08-01), Jordan et al.
patent: 6111537 (2000-08-01), Andersson
patent: 6307500 (2001-10-01), Cornman et al.
“The Relation Between Range Sampling Rate, System Bandwidth, and Variance Reduction in Spectral Averaging for Meteorological Radar,”Urkowitz, H.; Katz, S.L. Geoscience and Remote Sensing, IEEE Transactions on, vol.: 34 Issue: 3, May 1996. pp.:612.
Torres Sebastian
Zrnic Dusan S.
Andrea Brian
Tarcza Thomas H.
Zack Thomas
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