Doppler distrometer for the measurement of hydrometer size distr

Details Doppler distrometer for the measurement of hydrometer size distr Doppler distrometer for the measurement of hydrometer size distr

1983-10-28

1987-04-21

Tarcza, Thomas H.

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

Radar for meteorological use

342115, G01S 1395

Patent

active

046600388

ABSTRACT:
An apparatus and method are disclosed which employ the Doppler principle to measure the terminal velocity and, hence, the size distribution of hydrometeors such as raindrops and hailstones. The apparatus of the present invention employs a ground-based, upwardly directed, low power, 10.525 GHz homodyne continuous wave radar module to transmit microwave signals to falling hydrometeors within the size range of 0.5 mm through 4.0 cm, to record the frequency distribution and power spectrum of the reflected signals, and to process these data with "terminal velocity"-to-"hydrometeor diameter" calibration data to generate information on the hydrometeor size distribution in the precipitation under observation. The disclosed method permits a user of the apparatus to select the Doppler velocity threshold above which data are recorded for processing with a Fast Fourier Transform technique to determine hydrometer velocity values.

REFERENCES:
patent: 2897442 (1959-07-01), Wright et al.
patent: 3400394 (1968-09-01), Murchison et al.
patent: 3543269 (1970-11-01), Dudley
patent: 3852743 (1974-12-01), Gupta
patent: 4014019 (1977-03-01), Fetter
patent: 4084148 (1978-04-01), Koshikawa
patent: 4527159 (1985-07-01), Bergman
"Realtime Display System for HF Doppler Observation," by M. Tsutsui et al; Report on Ionosphere and Space Research in Japan, (vol. 30, Nos. 3-4; 12/76; pp. 89-94).
A. Hamid and S. Stuchly, "Monitoring the Velocity of Particulates Using Doppler Radar" (Journal of Microwave Power); p. 165; Jul. 1975.
M. I. Skolnik, "Police Radars", Radar Handbook, pp. 16-21; McGraw-Hill, N.Y., 1970.

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