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• 15 United States
• 10 France
• 8 Japan
• 7 China
• 5 Korea
• 2 Other

Patent Owner(s)

Patent Owner	Address
MATRA MARCONI SPACE UK LIMITED	THE GROVE WARREN LANE STANMORE MIDDLESEX HA7 4LY

International Classification(s)

• H04B:TRANSMISSION

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Shawyer, Roger J	Hants, GB2	1	42
# of filed Patents : 1 Total Citations : 42

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Patent Citation Ranking

• 42 Citation Count
• H04B Class

• 88.78 % this patent is cited more than
• 29 Age

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Maintenance Fees

Fee	Large entity fee	small entity fee	micro entity fee	due date

Fee	Large entity fee	small entity fee	micro entity fee
Surcharge after expiration - Late payment is unavoidable	$700.00	$350.00	$175.00
Surcharge after expiration - Late payment is unintentional	$1,640.00	$820.00	$410.00

Full Text

US Patent No: 5543801

Digitally controlled beam former for a spacecraft

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Abstract

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A digitally controlled beam former for a spacecraft which includes means for periodically calibrating the feed paths of the spacecraft's antenna array by measuring the apparent movement of the center of a reference signal and a nominal signal and utilising the measured data to compensate for at least the phase drift in the antenna feed paths. The measured data may also be used to compensate for amplitude and phase drift in the antenna feed paths.

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Description

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