Resources Contact Us Home
High precision surveillance system by means of multilateration of secondary surveillance radar (SSR) signals

Image Number 4 for United States Patent #7570194.

A system able to locate and identify aircraft and vehicles based on the reception and processing, with novel means and methods, of signals emitted by the transponder of the secondary surveillance radar, shortly SSR. The system has a number of fixed stations distributed in the area of interest, e.g. in the airport area; any signal (the well known SSR reply/squitter) transmitted by the on-board transponder is received by four or more stations and the measurement of three or more differences of times of arrival (TOA) permits the reconstruction of the position of the transponder in spite of the fact that the transmission time is unknown. Suitable algorithms based on optimal estimation enhance both the accuracy of TOA measurements and the accuracy of the reconstructed position. The effects of possible overlapping of signal in time are avoided or mitigated by multiple source separation techniques based on least squares algebraic processing.

  Recently Added Patents
Segmentation of a product markup image based on color and color differences
Maize hybrid X08B748
Combination therapy to enhance NK cell mediated cytotoxicity
Automated pizza preparation and vending system
Method of operating an electromechanical converter, a controller and a computer program product
Door-activated entry light fixture
Monitoring system
  Randomly Featured Patents
Adjustable side bearing for a railcar
Shoe lacing
Method and apparatus for repairing embedded memory in an integrated circuit
Measurement device of photographic density of film
Overhead bookholder
Nucleic acid encoding mammalian Ubr1
Thread-cutting chuck for CNC machine technology of rigid tapping
Organosilicon compounds
Cargo tie down device
Siren and light-bar control box