Multitone harmonic radar and method of use
First Claim
1. A multitone nonlinear radar system comprising:
- a transmitter that transmits a signal comprising at least two predetermined frequency components of varying intensity and/or power;
a receiver operating to receive return signals comprising harmonics of at least two predetermined frequencies, combinations of the at least two predetermined frequency components, and combinations of the harmonics of the at least two predetermined frequency components that are within a predetermined frequency range that has been predetermined to enable detection and/or classification of an electronic device;
at least one antenna operating to transmit and receive electromagnetic radiation operatively connected to the transmitter and receiver;
the receiver comprising at least one high pass filter for attenuating linear reflections at the two predetermined frequencies, andan analyzer configured to detect how the harmonics change with varying transmitted power;
whereby electronic devices may be detected and identified based upon the rate of change of measured power or intensity of the return signal components and wherein amplitudes that are received at different transmit powers in effect provide a signature for the electronic device that enable classification as to the type of electronic device and whether or not the electronic device is designed to transmit and/or receive information.
1 Assignment
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Accused Products
Abstract
A multitone nonlinear radar system (and a method of operating such a system) comprising a transmitter that transmits a signal comprising at least two predetermined frequency components; a receiver operating to receive return signals comprising harmonics of at least two predetermined frequencies, combinations of the at least two predetermined frequency components, and combinations of the harmonics of the at least two predetermined frequency components that are within a predetermined selected frequency range that has been predetermined to enable detection and/or classification of an electronic device; at least one antenna operating to transmit and receive electromagnetic radiation operatively connected to the transmitter and receiver; the receiver comprising at least one high pass filter for attenuating linear reflections at the two predetermined frequencies, and an analyzer;
whereby electronic devices may be detected and identified by analyzing return signals within a predetermined frequency range.
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Citations
20 Claims
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1. A multitone nonlinear radar system comprising:
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a transmitter that transmits a signal comprising at least two predetermined frequency components of varying intensity and/or power; a receiver operating to receive return signals comprising harmonics of at least two predetermined frequencies, combinations of the at least two predetermined frequency components, and combinations of the harmonics of the at least two predetermined frequency components that are within a predetermined frequency range that has been predetermined to enable detection and/or classification of an electronic device; at least one antenna operating to transmit and receive electromagnetic radiation operatively connected to the transmitter and receiver; the receiver comprising at least one high pass filter for attenuating linear reflections at the two predetermined frequencies, and an analyzer configured to detect how the harmonics change with varying transmitted power; whereby electronic devices may be detected and identified based upon the rate of change of measured power or intensity of the return signal components and wherein amplitudes that are received at different transmit powers in effect provide a signature for the electronic device that enable classification as to the type of electronic device and whether or not the electronic device is designed to transmit and/or receive information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A multitone nonlinear radar system comprising:
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a transmitter that transmits a signal comprising at least two predetermined frequency components; a receiver operating to receive return signals comprising harmonics of at least two predetermined frequencies, combinations of the at least two predetermined frequency components, and combinations of the harmonics of the at least two predetermined frequency components that are within a predetermined frequency range that has been predetermined to enable detection and/or classification of an electronic device; at least one antenna operating to transmit and receive electromagnetic radiation operatively connected to the transmitter and receiver; the receiver comprising at least one high pass filter for attenuating linear reflections at the two predetermined frequencies and an analyzer configured to analyze the amplitudes of received signals such that by varying the amplitude of the at least two frequency components at a predetermined rate and detecting the rate of change in amplitude of the frequency components of the received signals a detected electronics device may be classified; and a variable amplifier configured to amplifying the signal to be transmitted operatively connected to the transmitter that varies the amplitude of the at least two frequency components; whereby by receiving combinations of the at least two predetermined frequency components, and combinations of the harmonics of the at least two predetermined frequency components within the predetermined frequency range, the detection of an electronic device may be determined. - View Dependent Claims (11)
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12. A multitone nonlinear radar system adapted to be used in conjunction with one of the operation of hospital medical equipment in order to avoid interference between unknown electronics devices and the medical equipment and the operation of a plane in order to avoid interference between the operation of detected electronics devices by the passengers and the operation of the plane'"'"'s electronic equipment, the system comprising:
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a transmitter that transmits a signal comprising at least two predetermined frequency components; a receiver operating to receive return signals comprising harmonics of at least two predetermined frequencies, combinations of the at least two predetermined frequency components, and combinations of the harmonics of the at least two predetermined frequency components that are within a predetermined frequency range that has been predetermined to enable detection and/or classification of an electronic device; at least one antenna operating to transmit and receive electromagnetic radiation operatively connected to the transmitter and receiver; the receiver comprising at least one high pass filter for attenuating linear reflections at the two predetermined frequencies, and an analyzer; whereby electronic devices may be detected and identified by analyzing return signals within a predetermined frequency range.
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13. A multitone nonlinear radar system comprising:
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a transmitter that transmits a signal comprising at least two predetermined frequency components; a variable signal generator and an amplifier operatively connected to the transmitter that vary the amplitude and power of the at least two predetermined frequency components, a receiver operating to receive return signals comprising harmonics of at least two predetermined frequencies, combinations of the at least two predetermined frequency components, and combinations of the harmonics of the at least two predetermined frequency components that are within a predetermined frequency range that has been predetermined to enable detection and/or classification of an electronic device; at least one antenna operating to transmit and receive electromagnetic radiation operatively connected to the transmitter and receiver; the receiver comprising at least one high pass filter for attenuating linear reflections at the two predetermined frequencies, and an analyzer; whereby electronic devices can be detected and based upon the combinations of the at least two predetermined frequency components, and combinations of the harmonics of the at least two predetermined frequency components, the analyzer analyses the amplitude and power of received signals, whereby by varying the power of the at least two frequency components and detecting the rate of change in amplitude of the frequency components of the return signals, a detected electronics device may be classified as a cellphone or radio. - View Dependent Claims (14)
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15. A multitone nonlinear radar system comprising:
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a transmitter that transmits a signal comprising at least two predetermined frequency components;
the transmitter comprising a waveform generator used as a source of the transmitted signal, a step generator which adjusts the transmit signal power in at least approximately one decibel increments, a low pass filter that attenuates system generated harmonics before amplification, and an amplifier for amplifying the signal to be transmitted;a receiver operating to receive return signals comprising harmonics of at least two predetermined frequencies, combinations of the at least two predetermined frequency components, and combinations of the harmonics of the at least two predetermined frequency components that are within a predetermined selected frequency range that has been predetermined to enable detection and/or classification of an electronic device; at least one antenna operating to transmit and receive electromagnetic radiation operatively connected to the transmitter and receiver; the receiver comprising at least one high pass filter for attenuating linear reflections at the two predetermined frequencies and an analyzer; whereby electronic devices may be detected and identified by analyzing return signals within a predetermined frequency range. - View Dependent Claims (16)
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17. A multitone nonlinear radar system comprising:
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a transmitter that transmits a signal comprising at least two predetermined frequency components; a receiver operating to receive return signals comprising harmonics of at least two predetermined frequencies, combinations of the at least two predetermined frequency components, and combinations of the harmonics of the at least two predetermined frequency components that are within a predetermined frequency range that has been predetermined to enable detection and/or classification of an electronic device; at least one antenna operating to transmit and receive electromagnetic radiation operatively connected to the transmitter and receiver; the receiver comprising at least one high pass filter for attenuating linear reflections at the two predetermined frequencies, the at least one high pass filter comprising an adjustable high pass filter;
the receiver further comprising an amplifier operatively connected to the at least one adjustable high pass filter for passage of the harmonics within the predetermined selected frequency range and a plurality of band pass filters operatively connected to the amplifier, each of the plurality of band pass filters being limited to reception of a selected harmonic or selected combination of the at least two frequency components or harmonics; andan analyzer; whereby electronic devices may be detected and identified by analyzing return signals within a predetermined frequency range. - View Dependent Claims (18)
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19. A multitone nonlinear radar system comprising:
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a transmitter that transmits a signal comprising at least two predetermined frequency components; a receiver operating to receive return signals comprising harmonics of at least two predetermined frequencies, combinations of the at least two predetermined frequency components, and combinations of the harmonics of the at least two predetermined frequency components that are within a predetermined frequency range that has been predetermined to enable detection and/or classification of an electronic device; at least one antenna operating to transmit and receive electromagnetic radiation operatively connected to the transmitter and receiver; the receiver comprising at least one high pass filter for attenuating linear reflections at the two predetermined frequencies, and an analyzer comprising an algorithm which looks for patterns in the information and makes a decision as to the target type based on the patterns, the patterns comprising the transmit signal frequencies, the power of the transmit signal, the differences between the transmitted signal and the received return signals, the rate of variation of the transmit signal power and the rate of variation of the received signal power relative to the rate of variation of the transmit signal; whereby electronic devices may be detected and identified by analyzing return signals within a predetermined frequency range.
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20. A method of detecting electronic devices comprising:
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providing a transmitter that transmits a signal comprising at least two predetermined frequency components; providing a receiver operating to receive return signals comprising harmonics of at least two predetermined frequencies, combinations of the at least two predetermined frequency components, and combinations of the harmonics of the at least two predetermined frequency components that are within a predetermined frequency range that has been predetermined to enable detection and/or classification of an electronic device; at least one antenna operating to transmit and receive electromagnetic radiation operatively connected to the transmitter and receiver; the receiver comprising at least one filter for attenuating linear reflections at the two predetermined frequencies, and an analyzer; whereby electronic devices may be detected and identified by analyzing return signals based upon the rate of change of measured power or intensity of the return signal components and wherein amplitudes that are received at different transmit powers in effect provide a signature for the electronic device that enable classification as to the type of electronic device and whether or not the electronic device is designed to transmit and/or receive information.
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Specification