Communications: directive radio wave systems and devices (e.g. – Radar for meteorological use
Patent
1988-12-05
1990-01-23
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Radar for meteorological use
G01S 1395
Patent
active
RE0331520
ABSTRACT:
The detection and warning of microbursts, low level wind shear, and other weather disturbances, which are hazardous to aircraft operations and to the public at large, are accomplished with either an airport surveillance radar (ASR) or a multi-beam Doppler radar. ASR Doppler systems normally operate to receive one of two relatively large vertical fan beams having different elevation angles but which overlap one another so that they have equal gains at an elevation angle, called the null, at a relatively low angle, for example 5.degree.. Below this null, the low beam antenna gain exceeds that of the high beam, and conversely above it. Accordingly, by subtracting the high beam Doppler spectrum from that on the low beam, a Difference Doppler Spectrum (DDS) is produced which is positive below the null and negative above. The velocity bounds of the positive portion of the DDS provide the wind speed components at the null and at heights near the surface. These wind speed components are then utilized to measure and map radial and horizontal shear, the boundaries of the disturbance and other signatures such as vertical shear and turbulence and the rate of change of all the parameters, thereby permitting the detection of the location and track of the disturbance. A multi-beam Doppler radar can be utilized to perform similar functions of measuring the mean Doppler velocity, Doppler spectral breadth, and reflectivity simultaneously at all elevations. Both systems provide effective enhancements in signal to clutter ratio through pattern recognition and motion detection.
REFERENCES:
patent: 3340528 (1967-09-01), Atlas
patent: 3341844 (1967-09-01), Sweeney
patent: 3491358 (1970-01-01), Hicks
patent: 3573824 (1971-04-01), Armstrong et al.
patent: 3646555 (1972-02-01), Atlas
patent: 3715748 (1973-02-01), Hicks
patent: 3735333 (1973-05-01), Balser et al.
patent: 4015257 (1977-03-01), Felter
patent: 4223309 (1980-09-01), Payne
patent: 4389648 (1983-06-01), Lumscombe et al.
patent: 4404561 (1983-09-01), Mulder et al.
T. T. Fujita, "Analysis of Storm-Cell Hazards to Aviation as Related to Terminal Doppler Radar Siting and Update Rate", Dept. of Geophysical Sciences, University of Chicago, SMRP Research Paper 204, 1983.
W. David Zittel, "An Aviation Composite Hazards Product" Second International Conference on the Aviation Weather System, Jun. 19-21, 1985.
J. W. Wilson et al., "Microburst Wind Structure and Evaluation of Doppler Radar for Airport Wind Shear Detection", Journal of Climate and Applied Meteorology, 1984, vol. 23, pp. 898-995.
John W. Taylor, "Design of a New Airport Surveillance Radar (ASR-9)", Proceedings of the IEEE, Feb. 1985, vol. 73, pp. 284-289.
Committee Report on "Low Altitude Wind Shear and its Hazard to Aviation" Nat. Academy Press, Wash. D.C., 1983.
Barron Jr. Gilberto
Tarcza Thomas H.
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