Method and system for generating weather and ground reflectivity information
Active Publication Date: 2012-10-04
HONEYWELL INT INC
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Benefits of technology
[0007]Distribution of ground surface normalized radar cross section (NRCS) is estimated in a manner similar to weather reflectivity estimation. For the ground, the buffer represents the NRCS distribution in two dimensions to describe the ground surface, rather than the three dimensions to describe three-dimensional weather. Because one of the applications of an airborne radar is to provide a radar ground imp, the present invention provides a ground rap as an inherent part of the processing.
[0008]As will be readily appreciated from the foregoing summary, the invention provides more accurate information for storage in a three-dimensional buffer by using the radar signal power measurements to separately estimate the weather reflectivity distribution and the ground NRCS distribution. The process is performed by iteratively updating estimates of the distributions by using the difference between radar measurements and expected measurement values generated by a model of the measurement process acting on previously stored estimates of the distributions of weather reflectivity and ground NRCS.
Problems solved by technology
A problem with earlier attempts is that ground clutter contamination of the desired weather signal occurs.
As for any estimation process, the separate estimation of weather and ground reflectivity is not perfect.
Method used
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[0012]The present invention is a system, method, and computer program product for storing three-dimensional radar return data. FIG. 1 illustrates an example system 30 formed in accordance with the present invention. The system 30 includes a weather radar system 40, a processor 42, memory 43, a display device 44, an inertial navigation system (INS) 46, and a user interface 48 coupled to the processor 42. The display processor 42 is electrically coupled to the radar system 40, the display device 44, the INS 46, and the memory 43. An example radar system 40 includes a radar controller 50, a transmitter 52, a receiver 54, and an antenna 56. The radar controller 50 controls the transmitter 52 and the receiver 54 for performing the sending and receiving of signals through the antenna 56 based on aircraft data (i.e., position, heading, roll, yaw, pitch, etc.) received from the INS 46, or other aircraft systems.
[0013]The radar system 40 receives signals that arise from the scattering of tra...
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A method, system, and computer program product for storing weather radar return data into a three-dimensional buffer. The system located on an aircraft includes a radar system that transmits a radar signal and generates a radar measurement as a result of radar return of the transmitted radar signal. A three-dimensional buffer includes a plurality of storage locations. A processor generates or updates a reflectivity value in storage locations in the three-dimensional buffer based on the generated radar measurement, a previously stored reflectivity value for the storage location, and uncertainty parameters. The uncertainty parameters of normalized radar cross section for ground elements are initialized based on a type of ground associated with each of the elements. The uncertainty parameters for weather reflectivity are initialized based on a priori information. The generated reflectivity values are stored in the three-dimensional buffer according to the storage locations.
Description
BACKGROUND OF THE INVENTION[0001]Attempts have been made to take radar signals received from the aircraft radar system, convert it to a reflectivity value, and store it in a location in a three-dimensional (3-D) weather buffer relative to the range associated with the radar signal. The 3-D weather buffer is an array of computer memory that includes data that describes a distribution of a weather reflectivity within a three-dimensional space. In other attempts, radar return signal power is converted to reflectivity based on certain assumptions, and used to populate elements of a 3D weather buffer.[0002]A problem with earlier attempts is that ground clutter contamination of the desired weather signal occurs. Previous attempts to prevent ground clutter contamination have used calculations of antenna beam proximity to the assumed location of the ground, and assumptions of the ground signal scattering properties to determine the degree of signal contamination, and then to suppress the si...
Claims
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Login to View More IPC IPC(8): G01S13/95
CPCG01S13/953G01S7/414Y02A90/10
Inventor CHRISTIANSON, PAUL
Owner HONEYWELL INT INC