Radio ranging using sequential time-difference-of-arrival...

Details Radio ranging using sequential time-difference-of-arrival... Radio ranging using sequential time-difference-of-arrival...

2008-07-22

2008-07-22

Phan, Dao L (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Beacon or receiver

C342S442000

Reexamination Certificate

active

11520418

ABSTRACT:
A method determines a position of a target object. A window function is applied repeatedly to a first signal and a second signal of a pair of radio signals received at a pair of passive sensors from a target object while time shifting the window function during a correlation interval to produce a first windowed signal and a second windowed signal for each application. The first windowed signals are cross-correlating with the second windowed signals to determine a peak for each cross-correlation. The peaks are compared sequentially in time with a predetermined threshold to detect a first pulse in the first signal and a first pulse in the second signal. A delay between the first pulses indicative of a position of the target object.

REFERENCES:
patent: 5659520 (1997-08-01), Watson et al.
patent: 2006/0062333 (2006-03-01), Yan
patent: 2007/0153873 (2007-07-01), Fullerton

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