US 11,750,275 B2
Geolocation of radio frequency devices using spaceborne phased arrays
Raymond J. Sedwick, University Park, MD (US); and Abel Avellan, Coral Gables, FL (US)
Assigned to AST & Science, LLC, Miami, FL (US)
Filed by AST & Science, LLC, Miami, FL (US)
Filed on Jan. 13, 2022, as Appl. No. 17/575,087.
Application 17/575,087 is a continuation of application No. 17/171,759, filed on Feb. 9, 2021, granted, now 11,239,904.
Claims priority of provisional application 62/975,027, filed on Feb. 11, 2020.
Prior Publication US 2022/0140890 A1, May 5, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 7/185 (2006.01); H04B 7/024 (2017.01); H04W 84/06 (2009.01)
CPC H04B 7/18513 (2013.01) [H04B 7/024 (2013.01); H04B 7/1855 (2013.01); H04W 84/06 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A satellite communication system comprising:
one or more low Earth orbit (LEO) satellites comprising: a phased antenna array configured to provide a plurality of beams and a field of view, the field of view having a plurality of cells and each of the plurality of beams is associated with one of the plurality of cells within the field of view; and
one or more delay compensators configured to perform delay compensation on signals relative to center or approximately center of each of the plurality of beams so as to obtain an approximately constant or fixed delay;
wherein each of the plurality of beams has one or more frequencies, and the phased antenna array is configured to receive a signal from a wireless device via one of the plurality of beams based on the one or more frequencies;
wherein the phased antenna array is configured to detect that the signal is within the field of view; and
wherein power of the signal is less than approximately 1 Watt and gain of the signal is less than approximately 0 dB.