Wide band stepped frequency ground penetrating radar
First Claim
1. A method for determining the presence of an object, comprising:
- producing signal pulses of varying frequencies;
transmitting said signal pulses from a transmit antenna and receiving said signal pulses which are reflected from the object at a receive antenna; and
recombining each of said signal pulses as received at said receive antenna with itself as originally produced to produce a direct current voltage indicative of any phase difference between said signal pulses as received at said receive antenna and as originally produced.
5 Assignments
0 Petitions
Accused Products
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).
114 Citations
19 Claims
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1. A method for determining the presence of an object, comprising:
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producing signal pulses of varying frequencies; transmitting said signal pulses from a transmit antenna and receiving said signal pulses which are reflected from the object at a receive antenna; and recombining each of said signal pulses as received at said receive antenna with itself as originally produced to produce a direct current voltage indicative of any phase difference between said signal pulses as received at said receive antenna and as originally produced. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A stepped frequency radar system for detecting a target, comprising:
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a single frequency source for producing signals of variable frequency; a divider for dividing the signals; a transmitter for transmitting a first divided portion of the signals; a receiver for receiving the first divided portion of the signals as the first divided portion is reflected from the target; and a mixer for mixing the first divided portion of the signals with a second divided portion of the signals. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification