Multiple frequency through-the-wall motion detection and...

Details Multiple frequency through-the-wall motion detection and... Multiple frequency through-the-wall motion detection and...

2004-11-02

2008-12-02

Pihulic, Dan (Department: 3662)

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

Transmission through media other than air or free space

C342S192000, C342S127000, C342S129000, C342S028000

Reexamination Certificate

active

07460052

ABSTRACT:
A multi-tone CW radar (14) is used to project signals from an antenna (22) and to receive returns with the same antenna. The phase differences between the outgoing signals and the returns are analyzed to determine the existence of motion and the range to a moving object (10). A model is made which has range as its major parameter. A waveform associated with the phase difference between outgoing signals and returns for one of the tones is compared to templates produced by the model to determine which has a range that most closely matches. By varying the range parameters, when a match is detected the range to the object can be obtained even if its motion is pseudorandom. If the range is measured with multiple units it is possible to measure the location of the object. This can be done assuming a grid and algorithmically combining the ranges from the units.

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