Communications: directive radio wave systems and devices (e.g. – Radar for meteorological use
Patent
1991-06-13
1994-05-10
Tubbesing, T. H.
Communications: directive radio wave systems and devices (e.g.,
Radar for meteorological use
G01S 1395
Patent
active
053111834
ABSTRACT:
The present invention is an airborne radar system which scans the flight path of an aircraft with two radar scans, an upper elevation pointing above local level and a lower elevation scan pointing below the glide slope. The radar returns from the upper elevation scan are used to detect the core of the microburst. The core and a model of the windshear which uses the core are used to select angles and range cell candidates, in a lower elevation scan, for hazard detection processing. The candidates in the lower scan, which is pointing at the ground, are used to create a hazard map tested against a predetermined hazard threshold. A threshold violation results in a pilot alert. The hazard map includes a vertical factor determined through model coefficients in the radial outflow as a function of altitude. The invention applies the model to determine the total hazard factor along the glideslope using the vertical hazard of the model and altitude scaling of the horizontal hazard from the lower bar elevation to the glideslope of the aircraft. The present invention also includes a radar scan with two pulse repetition frequencies which allows the elimination of non-correlated returns. The system also includes post detection integration with a sliding azimuth window to enhance the signal to noise ratio. The system also combines velocities within a single range gate to produce a velocity representing the windspeed at that range.
REFERENCES:
patent: Re33152 (1990-01-01), Atlas
patent: 3573824 (1971-04-01), Armstrong
patent: 4223309 (1980-09-01), Payne
patent: 4649388 (1987-03-01), Atlas
patent: 4712108 (1987-12-01), Schwab
patent: 4835536 (1989-05-01), Piesinger et al.
patent: 4965573 (1990-10-01), Gallagher
patent: 5077558 (1991-12-01), Kuntman
patent: 5130712 (1992-07-01), Rubin et al.
ARINC Characteristic 708-5 Airborne Weather Radar, Aeronautical Radio Inc., 2551 Riva Road, Annapolis, Md. 21401, Jan. 11, 1988.
AIAA-88-4657, Airborne Doppler Radar Detection of Low Altitude Windshear, E. M. Bracalente, C. L. Britt and W. R. Jones, NASA Langley Research Center, Hampton, Va., Sep. 1988.
ARP 4102/11, Airborne Windshear Systems, Rev 1, Draft 9, SAE Committee S-7, TEAS7-6, Project No. S7-84-8, May 11, 1988.
TSO-C117, Airborne Windshear Warning and Escape Guidance Systems for Transport Airplanes, Dept. of Transportation, Federal Aviation Administration, Aircraft Certification Service, Washington, D.C., Jul. 24, 1990.
RTCA (Radio Technical Commission for Aeronautics) Document No. DO-160B, Environmental Conditions and Test Procedures for Airborne Equipment, Aug. 1989.
RTCA Document No. DO-178A, Software Considerations in Airborne Systems and Equipment Certification, dated Mar. 1985.
Proctor, FH, "NASA Wind Shear Model--Summary of Model Analyses" Airborne Windshear Detection and Warning Systems, NASA CP-100006, 1988, pp. 29-66.
Advisory Circular (AC) 25-12, "Airworthiness Criteria for the Approval of Airborne Windshear Warning Systems in Transport Category Airplanes", Nov. 2, 1987.
Bowles, R. L. "Windshear Detection and Avoidance Airborne Systems Survey", Twenty-nineth IEEE Conference on Decision and Control, Honolulu, Hawaii, Dec. 5-7, 1990.
Lucchi, G. A. (RCA), "Commercial Airborne Weather Radar Technology", IEEE International Radar Conference, 1980, pp. 123-130.
Richard O. Duda, Peter E. Hart, Pattern Classification and Scene Analysis, Wiley Interscience, New York, 1974.
A. Papoulis, Probability, Random Variables and Stochastic Processes, McGraw-Hill, New York 1984.
Dan D. Vicroy, A Simple, Analytical, Axisymmetric Microburst Model for Downdraft Estimation. NASA Report TM 104053, Feb. 91.
Rosa Am Oseguera and Roland L. Bowles, A Simple, Analytic 3-Dimensional Downburst Model Based on Boundary Stagnation Flow, NASA TM-100632, Jul. 1988.
Fred H. Proctor, "Numerical Simulations on an Isolated Microburst. Part II: Sensitivity Experiments" J. Atmospheric Sciences, vol. 46, No. 14, 15 Jul. 1989, pp. 2143-2165.
Fred H. Proctor, "Numerical Simulations of an Isolated Microburst, Part I: Dynamics and Structure", J. Atmospheric Sciences, vol. 45, No. 21, Nov. 1988, pp. 3137-3160.
Terry Zweifel, "Temperature Lapse Rate as an Adjunct to Windsheer Detection", Airborne Wind Shear Detection and Warning Systems, Third Combined Manufacturer's and Technologist's Conference, Hampton, Va. Oct. 16-18, 1990, pp. 480-506.
Merrill I. Skolnik, Introduction to Radar Systems, Second Edition pp. 498-507.
Mathews Bruce D.
Mountcastle Paul D.
Patterson Walter W.
Sutcliff W. G.
Tubbesing T. H.
Westinghouse Electric Corp.
LandOfFree
Windshear radar system with upper and lower elevation radar scan does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Windshear radar system with upper and lower elevation radar scan, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Windshear radar system with upper and lower elevation radar scan will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2414964