US 11,855,751 B2
Forward and reverse calibration for ground-based beamforming
Soheil Sayegh, Gaithersburg, MD (US)
Assigned to Viasat, Inc., Carlsbad, CA (US)
Filed by Viasat, Inc., Carlsbad, CA (US)
Filed on Aug. 18, 2022, as Appl. No. 17/890,400.
Application 13/710,063 is a division of application No. 12/596,609, granted, now 8,331,329, issued on Dec. 11, 2012, previously published as PCT/US2007/080720, filed on Oct. 8, 2007.
Application 17/890,400 is a continuation of application No. 17/117,679, filed on Dec. 10, 2020, granted, now 11,456,802.
Application 17/117,679 is a continuation of application No. 16/677,443, filed on Nov. 7, 2019, granted, now 10,892,820, issued on Jan. 12, 2021.
Application 16/677,443 is a continuation of application No. 15/704,873, filed on Sep. 14, 2017, granted, now 10,516,475, issued on Dec. 24, 2019.
Application 15/704,873 is a continuation of application No. 14/682,938, filed on Apr. 9, 2015, granted, now 9,768,859, issued on Sep. 19, 2017.
Application 14/682,938 is a continuation of application No. 13/710,063, filed on Dec. 10, 2012, granted, now 9,025,591, issued on May 5, 2015.
Claims priority of provisional application 60/828,539, filed on Oct. 6, 2006.
Prior Publication US 2022/0407591 A1, Dec. 22, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 7/204 (2006.01); H04B 7/185 (2006.01); H04L 5/00 (2006.01); H04W 88/16 (2009.01)
CPC H04B 7/2041 (2013.01) [H04B 7/18513 (2013.01); H04L 5/0007 (2013.01); H04L 5/0048 (2013.01); H04W 88/16 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for ground-based calibration of a satellite forward link, the method comprising:
transmitting a pseudo-noise (PN) code from a gateway to a satellite;
receiving the PN code from the gateway at the satellite;
transmitting the PN code from the satellite through a plurality of feeds to at least one calibration earth station, wherein the PN code is transmitted through each feed consecutively one after another;
receiving the PN code at the at least one calibration earth station; and
determining either or both of a phase shift or an amplitude shift of the PN code.