Beat-product radio imaging method (RIM)

Details Beat-product radio imaging method (RIM) Beat-product radio imaging method (RIM)

2010-06-15

2011-11-22

Sotomayor, John (Department: 3662)

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

Transmission through media other than air or free space

C342S021000, C342S179000, C342S180000

Reexamination Certificate

active

08063814

ABSTRACT:
A beat-product radio imaging method (RIM) system uses a matched continuous wave (CW) transmitter and receiver to electronically image material in between. Signal attenuation measurements are taken from a number of different transmitter and receiver perspectives around the material. The transmitter and receiver each have a crystal oscillator rated at 10-ppm or better frequency uncertainty. The receiver's crystal oscillator is used as a local oscillator to beat down the transmitter's carrier frequency to baseband. The frequency error between the local oscillator and the transmitter carrier frequencies produces a beat product of less than one Hertz in frequency and its magnitude is inversely proportional to the path attenuation between the transmitter and receiver. An extremely low-pass filter is used to remove everything above one Hertz in the detector. The receiver sensitivity is therefore extraordinarily high.

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patent: 2010/0292568 (2010-11-01), Droitcour et al.

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