Wide band stepped frequency ground penetrating radar

Details Wide band stepped frequency ground penetrating radar Wide band stepped frequency ground penetrating radar

1994-04-28

1996-03-12

Sotomayor, John B.

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

Transmission through media other than air or free space

342129, 342194, G01S 1324, G01S 1304

Patent

active

054990297

ABSTRACT:
A wide band ground penetrating radar system (10) embodying a method wherein a series of radio frequency signals (60) is produced by a single radio frequency source (16) and provided to a transmit antenna (26) for transmission to a target (54) and reflection therefrom to a receive antenna (28). A phase modulator (18) modulates those portion of the radio frequency signals (62) to be transmitted and the reflected modulated signal (62) is combined in a mixer (34) with the original radio frequency signal (60) to produce a resultant signal (53) which is demodulated to produce a series of direct current voltage signals (66) the envelope of which forms a cosine wave shaped plot (68) which is processed by a Fast Fourier Transform unit 44 into frequency domain data (70) wherein the position of a preponderant frequency is indicative of distance to the target (54) and magnitude is indicative of the signature of the target (54).

REFERENCES:
patent: 4896116 (1990-01-01), Nagashima et al.
patent: 5325095 (1994-06-01), Vadnais et al.
patent: 5345240 (1994-09-01), Frazier

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