System and method of radar detection of non-linear interfaces
First Claim
1. A system for detecting and characterizing man-made objects that possess nonlinear junctions in which incident signals are transmitted into free space, and upon contact with said man-made objects that possess nonlinear junctions, said man-made objects that possess nonlinear junctions will reflect new signals that can be received and characterized, said system comprising:
- a first signal generator that generates a first incident signal, f1;
a second signal generator that generates a second incident signal, f2, wherein said first incident signal, f1, has a high frequency and said second incident signal, f2, has a low frequency;
transmit circuitry that transmits said first signal, f1, and said second signal, f2;
receive circuitry that is tuned to receive signals that are exact harmonic multiples of said incident signals, f1 and f2, and is also tuned to receive inter-modulation products that are reflected from said man-made objects that possess nonlinear junctions as a result of said man-made objects being illuminated by said incident signals f1 and f2;
an antenna assembly coupled with said transmit and receive circuitry and including a high frequency directional array antenna that assists in the transmission of said first incident signal, f1, and a low frequency omni-directional array antenna that assists in the transmission of said second incident signal, f2, wherein said antenna assembly also assists in the reception of reflected signals from said man-made objects that possess nonlinear junctions;
a signal processor that processes said received reflected signals from said man-made objects that possess nonlinear junctions such that the man-made objects can be characterized according to their composition;
a master clock that synchronizes said first signal generator, said second signal generator, said receive circuitry, said transmit circuitry, and said signal processor; and
a data bus that couples said master clock, said first signal generator, said second signal generator, said receive circuitry, said transmit circuitry, and said signal processor together.
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Abstract
A harmonic radar nonlinear junction detector system for detecting concealed weapons, electronics, and other man-made objects utilizing state-of-the art wireless technology, circuit fabrication, signal synthesis, and computer processing techniques to detect and characterize man-made objects possessing nonlinear junctions. The system transmits a pair of low power waveforms and a receiver within the system is coherently tuned to harmonics of the transmitted frequencies of the waveforms to detect man-made metal objects and electronics that contain non-linear junctions. The receiver is also capable of receiving inter-modulation products reflected from the man-made objects that are a result of using two incident signals. The system uses two signal sources generating user-definable waveforms of variable frequencies in order to provide enhanced discrimination and target identification abilities via the processing of returned inter-modulation products.
94 Citations
14 Claims
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1. A system for detecting and characterizing man-made objects that possess nonlinear junctions in which incident signals are transmitted into free space, and upon contact with said man-made objects that possess nonlinear junctions, said man-made objects that possess nonlinear junctions will reflect new signals that can be received and characterized, said system comprising:
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a first signal generator that generates a first incident signal, f1;
a second signal generator that generates a second incident signal, f2, wherein said first incident signal, f1, has a high frequency and said second incident signal, f2, has a low frequency;
transmit circuitry that transmits said first signal, f1, and said second signal, f2;
receive circuitry that is tuned to receive signals that are exact harmonic multiples of said incident signals, f1 and f2, and is also tuned to receive inter-modulation products that are reflected from said man-made objects that possess nonlinear junctions as a result of said man-made objects being illuminated by said incident signals f1 and f2;
an antenna assembly coupled with said transmit and receive circuitry and including a high frequency directional array antenna that assists in the transmission of said first incident signal, f1, and a low frequency omni-directional array antenna that assists in the transmission of said second incident signal, f2, wherein said antenna assembly also assists in the reception of reflected signals from said man-made objects that possess nonlinear junctions;
a signal processor that processes said received reflected signals from said man-made objects that possess nonlinear junctions such that the man-made objects can be characterized according to their composition;
a master clock that synchronizes said first signal generator, said second signal generator, said receive circuitry, said transmit circuitry, and said signal processor; and
a data bus that couples said master clock, said first signal generator, said second signal generator, said receive circuitry, said transmit circuitry, and said signal processor together. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification