Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Reexamination Certificate
2005-05-10
2005-05-10
Tarcza, Thomas H. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
C342S463000, C342S387000
Reexamination Certificate
active
06891500
ABSTRACT:
The time difference of arrival for a signal received at two or more receiving sites as transmitted from a wireless communications device, is determined by a frequency domain technique. The constituent frequencies of the signals received at the two or more receiving sites are determined, including the phase, or a value representative of the phase, of each frequency component. The phase values for the same frequency are subtracted to yield a phase difference values as a function of frequency. The slope of the function represents the time difference of arrival for the wireless communications device signal as received at the two receiving sites. To determine the mobile location based on the determined time difference of arrival values, a seed or initial location is first assumed for the wireless communications device and the distance difference of arrival (the time difference of arrival multiplied by the speed of light) is calculated. The calculated time difference of arrival is then used to adjust the distance difference of arrival by continuously iterating the position of the wireless communications device until the calculated distance of arrival and the calculated time difference of arrival (as multiplied by the speed of light) are within a predetermined margin.
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Hall Christopher J.
Ray Jimmy C.
Turner Clay S.
Beusse Brownlee Wolter Mora & Maire P.A.
DeAngelis Jr. John L.
Mull F H
Tarcza Thomas H.
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