Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Reexamination Certificate
2007-07-03
2007-07-03
Phan, Dao (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
C342S372000
Reexamination Certificate
active
11256076
ABSTRACT:
Calculating the phase shifts assigned to the elements of a phased array antenna such that the resulting beam is shaped to serve a desired area of operation (AOO) has historically been computationally burdensome and often required expert intervention. To maximize computational speed, synthesis of shaped phased-array antenna beams is performed by linearizing the antenna pattern equation and then iteratively performing a mini-norm solution at each step until a solution is reached. In particular, this approach is performed in such a manner that eliminates the need for a pre-computed target and is also performed such that at each iteration the change in an element's phase is adapted to remain within a threshold range. As a result, phased array beam patterns may be synthesized and applied to phased-array antennas so as to allow real time tracking of AOOs on the Earth from Low and Medium Earth Orbit satellites.
REFERENCES:
patent: 6343307 (2002-01-01), Mendlovic et al.
patent: 6522897 (2003-02-01), Martek et al.
patent: 2005/0232057 (2005-10-01), Hansen et al.
Lockheed Martin Corporation
McDermott Will & Emery LLP
Phan Dao
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