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Automated method to remove false echoes due to solar interference
| Details |
Inventors: Honey, Steven John; Lang, Dennis Andrew;
Assignee: WSI Corporation (Billerica, MA)
Primary Examiner: Gregory; Bernarr E.
Assistant Examiner:
Attorney, Agent or Firm: Woodcock Washburn LLP
Systems and methods for automated detection and removal of solar interference in real time from NEXRAD or other similar radar products. The radar site latitude and longitude and scan elevation time are extracted from the radar data and a position of the Sun is determined for the extracted latitude and longitude and scan time. A radial that has been contaminated with solar interference is determined and the solar interference is removed from that radial; The removal process does not impact the timeliness of critical products, and conservatively removes solar interference. In addition inaccuracies with NEXRAD clock time synchronization are accounted for to ensure accurate results. |
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DETAILED DESCRIPTION The present invention is directed to systems and methods for automated detection and removal of Death Rays due to solar interference.
In accordance with the present invention, the removal process is applied in real time to NEXRAD BREF1 products or other similar radar products.
The removal process does not impact the timeliness of critical products, and conservatively removes solar interference.
In other words, the process may leave in some false echoes rather than to remove real echoes.
Still further, the present invention overcomes problems with inaccuracies with NEXRAD clock time synchronization.
In accordance with an aspect of the present invention, there is provided a method of removing solar interference from radar data.
The method includes extracting a site latitude, a site longitude and scan elevation time from the radar data; determining the position of the Sun for the extracted latitude and longitude and scan time; determining a radial that has been contaminated with solar interference; and removing the solar interference.
In accordance with a feature of the invention, the removal process is only performed if the Sun's position is within a threshold elevation angle of an elevation scan angle.
The threshold elevation angle may be between 0.
5 and 1.
3 degrees.
In accordance with another feature, the method accounts for inaccuracies in a clock at a radar site from which the radar data was received.
This may include identifying the radial closest to a Sun azimuth and its neighbors and sorting a predetermined number of radials closest to the Sun position based on a number of non-zero echoes in each radial.
In accordance with yet another feature, determining a radial contaminated with solar interference may include determining if the number of non-zero echoes in a highest priority radial exceeds a second predetermined threshold; determining if a difference of the number of non-zero echoes between the highest and lowest radial exceed a percentage threshold; and determining if a three highest priority radials are azimuthally consecutive, and if so, returning a middle radial, otherwise returning a radial with the highest number of non-zero echoes
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