Weather radar system and method using data from a lightning sensor

• US 7,868,811 B1
• Filed: 07/22/2008
• Issued: 01/11/2011
• Est. Priority Date: 03/07/2006
• Status: Active Grant

• Current Assignee: Rockwell Collins, Inc. (Raytheon Technologies Corporation d/b/a RTX)
• Original Assignee: Rockwell Collins, Inc. (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Woodell, Daniel L., Walling, Karen L., Kronfield, Kevin M.
• Primary Examiner(s): Gregory; Bernarr E
• Application Number:
  US12/177,767
• Time in Patent Office: 903 Days
• Field of Search: 342 26 R- 26 D, 342 52- 58, 342175-182, 342/198, 342/450, 342/451, 342/460, 342463-465, 342190-197, 702 1- 4, 324/72, 324/72.5, 731/701.6, 731/702.4
• US Class Current: 342/26.00B
• CPC Class Codes: G01S 13/86 Combinations of radar systems with non-radar systems, e.g. sonar, direction finder
• CPC Class Codes: G01S 13/953 mounted on aircraft
• CPC Class Codes: G01S 7/22 Producing cursor lines and indicia by electronic means
• CPC Class Codes: G01W 1/02 Instruments for indicating weather conditions by measuring two or more variables, e.g. humidity, pressure, temperature, cloud cover or wind speed G01W1/10 takes precedence
• CPC Class Codes: G01W 1/16 Measuring atmospheric potential differences, e.g. due to electrical charges in clouds measuring potentiels in general G01R
• CPC Class Codes: Y02A 90/10 Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation

Abstract

A weather radar system includes an input for receiving lightning detection data and processing electronics for determining a presence of a convective cell or associated hazard. The processing electronics receive weather radar data and the lightning detection data. The weather radar data is related to radar returns. The processing electronics provide temporal or spatial filtering of the lightning detection data to provide filtered data and determine a position of the convective cell or associated hazard in response to the weather radar data and the filtered data.

Claims

1. A weather radar system for an aircraft, comprising:

an input for receiving lightning detection data on the aircraft; and

processing electronics coupled to the input, receiving weather radar data, and receiving the lightning detection data via the input, the processing electronics providing temporal, spatial, or both temporal and spatial filtering of the lightning detection data to provide filtered data, the processing electronics using the filtered data to map a presence of lightning to a geographic area including an error factor, the processing electronics determining a position of a convective cell by correlating the weather radar data and the geographic area including the error factor.

2. The weather radar system of claim 1, wherein the processing electronics includes a system of rules to determine which of a plurality of weather events will be correlated with new lightning detection data received from the input.

3. The weather radar system of claim 1, wherein the processing electronics determines a direction to the convective cell based on the determined position of the convective cell.

4. The weather radar system of claim 1, wherein the processing electronics causes the weather radar system to analyze geographic regions in response to determining the position of the convective cell.

5. The weather radar system of claim 1, wherein the processing electronics causes the weather radar system for the aircraft to provide a weather radar beam to the position in response to the filtered data.

6. The weather radar system of claim 1, further comprising a display wherein a cell on the display is marked as hazardous based on the correlation of the weather radar data and the geographic area.

7. The weather radar system of claim 6, wherein the a shape of the convective cell is generated on the display based on the correlation of the weather radar data and the geographic area.

8. The weather radar system of claim 1, wherein the weather radar system performs queuing in response to detection of the convective cell.

9. The weather radar system of claim 8, wherein the processing electronics utilizes a reflectivity parameter and a spectral width parameter to determine weather events for correlation with the geographic area.

10. The weather radar system of claim 1, further comprising an aircraft lightning sensor coupled to the input.

11. The weather radar system of claim 1, wherein the processing electronics are configured to generate geo-referenced shape descriptors for different weather events based on the weather data, and wherein mapping a presence of lightning data to a geographic area including an error factor comprises generating a geo-referenced, line segment for a lightning event based on sensor position, sensor azimuth, and a possible range for the lightning event.

12. The weather radar system of claim 11, wherein correlating the weather radar data and the geographic area including the error factor comprises determining whether the geo-referenced line segment for the lightning event intersects a geo-referenced shape descriptor for a weather event.

13. The weather radar system of claim 1, wherein convective cells are correlated with lightning tracks to determine a bearing dependent azimuth bias.

14. A method of displaying an indication of a convective cell on an aircraft display in an avionics system, the method comprising:

receiving lightning sensor data from an aircraft lightning sensor;

filtering the lightning sensor data with spatial and temporal filters;

receiving radar returns from an aircraft weather radar system;

using the filtered data to map a presence of lightning to a geographic area including an error factor;

determining a position of the convective cell by correlating the weather radar data and the geographic area including the error factor; and

providing the indication of the convective cell on the aircraft display by correlating the radar returns and the filtered lightning data.

15. The method of claim 14, further comprising using a system of rules to determine which of a plurality of weather events will be correlated with new lightning detection data.

16. The method of claim 14, further comprising mapping the lightning sensor data after the filtering step to determine thunderstorm cores, wherein the thunderstorm cores are identified as areas having the largest number of flashes.

17. The method of claim 14, further comprising determining growing convective cell core locations by correlating new lightning data with the radar returns.

18. The method of claim 14, wherein the indication is a textual symbol or color on a weather radar display.

19. The method of claim 14, wherein the radar returns are at least one of multi-scan radar returns and volumetric scanning radar returns.

20. An apparatus for determining a presence of a hazard for an aircraft, the apparatus comprising:

means for determining a location of cells from weather radar returns;

means for determining a presence of lightning;

means for mapping the presence of lightning to a geographic area including an error factor;

means for determining a hazard location by correlating the geographic area of the lightning and the location of cells from the weather radar returns; and

means for displaying the hazard on a display in response to the hazard location in relation to an aircraft flight path.