Earth-penetrating radar with inherent near-field rejection

Details Earth-penetrating radar with inherent near-field rejection Earth-penetrating radar with inherent near-field rejection

2006-06-29

2009-06-16

Tarcza, Thomas H (Department: 3662)

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

Transmission through media other than air or free space

C342S179000, C342S129000, C342S159000

Reexamination Certificate

active

07548181

ABSTRACT:
A ground-penetrating radar comprises a transmitter for launching pairs of widely separated and coherent continuous waves. Each pair is separated by a different amount, such as 10 MHz, 20 MHz, and 30 MHz. These are equivalent to modulation that have a phase range that starts at 0-degrees at the transmitter antenna which is near the ground surface. Deep reflectors at 90-degrees and 270-degrees will be illuminated with modulation signal peaks. Quadrature detection, mixing, and down-conversion result in 0-degree and 180-degree reflections effectively dropping out in demodulation.

REFERENCES:
patent: 6664914 (2003-12-01), Longstaff et al.
patent: 6765527 (2004-07-01), Jablonski et al.
patent: 7307575 (2007-12-01), Zemany
patent: 7313199 (2007-12-01), Gupta et al.
patent: 2007/0013578 (2007-01-01), Iritani et al.
Remote Sensing by Radar Jakob J. van Zyl, Yunjin Kim Wiley Encylopedia of Electrical and Electronics Engineering Published online: Dec. 27, 1999.

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