Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Reexamination Certificate
2011-04-19
2011-04-19
Tarcza, Thomas H (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
C342S463000, C342S451000, C342S387000
Reexamination Certificate
active
07928908
ABSTRACT:
In a multilateration system receivers are grouped into two groups. The first group is used to determine a position of a signal source, for example, an aircraft equipped with a SAR transponder. From the determined position, predicted time of arrival values are produced for the second group receivers. These are compared with the actual time of arrival values for the signals arriving at the second group receivers. A difference is determined and then the variation of that difference is determined as the aircraft travels in its track. The groupings are then varied and further variations determined. When the minimum variation is determined an alert is given that the second group has a receiver which is operating with a larger than desirable group time delay.
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Fisher James Joseph
Galloway Philip Edward Roy
Quilter Timothy John
Weedon Robert John
Crowell & Moring LLP
Galt Cassi
Roke Manor Research Limited
Tarcza Thomas H
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