US 9,810,760 B1
Computing angle of arrival of radio signals
John J. Borchardt, Albuquerque, NM (US); and David K. Steele, Albuquerque, NM (US)
Assigned to National Technology & Engineering Solutions of Sandia, LLC, Albuquerque, NM (US)
Filed by National Technology & Engineering Solutions of Sandia, LLC, Albuquerque, NM (US)
Filed on Nov. 25, 2014, as Appl. No. 14/552,707.
Int. Cl. G01S 5/04 (2006.01); G01S 3/14 (2006.01)
CPC G01S 3/14 (2013.01) 20 Claims
OG exemplary drawing
 
1. A system that facilitates computing an angle of arrival of a radio signal emitted from a transmitter, the system comprising:
a cylindrical sheath that is fitted around an exterior surface of a cylindrical obstacle, the sheath having an interior surface and an exterior surface;
a plurality of antennas positioned on the exterior surface of the cylindrical sheath;
a plurality of receivers respectively coupled to the plurality of antennas, the plurality of receivers configured to output respective measurements pertaining to the radio signal; and
a processing circuit that is in communication with each receiver in the plurality of receivers, the processing circuit configured to compute the angle of arrival of the radio signal based upon:
a model that models the plurality of antennas as infinite-length magnetic line sources and models the cylindrical sheath as an infinite length conductive cylinder; and
the measurements pertaining to the radio signal respectively output by the plurality of receivers.