Electromagnetic field detection systems and methods
First Claim
1. An apparatus configured to detect electromagnetic pulse (EMP) and intentional electromagnetic interference (IEMI) events, the apparatus comprising:
- a shielded loop magnetic antenna configured to receive signals representing at least a portion of a far field magnetic field generated from an electromagnetic pulse (EMP) or intentional electromagnetic interference (IEMI) event, the EMP or IEMI event having an electric field amplitude between 10 volts/meter and 100,000 volts/meter and a frequency of between 1 MHz to 10 GHz; and
a circuit electrically connected to the shielded loop magnetic antenna, the circuit including;
an equalizer connected to the shielded loop magnetic antenna via a direct current isolation circuit, the equalizer outputting signals having amplitudes independent of frequencies of detected signals, the equalizer compensating for a varying frequency response of the antenna;
a logarithmic amplifier electrically connected to the equalizer and configured to generate a range of signals based on signals received at the antenna;
a peak detector receiving signals from the logarithmic amplifier and configured to capture a peak value of the signals; and
wherein the peak detector determines a peak value of an electrical field of the EMP or IEMI event based on the captured signals.
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Accused Products
Abstract
A method and apparatus configured to detect electromagnetic field events are disclosed. One apparatus includes an antenna and a circuit electrically connected to the antenna. The circuit includes electronics communicatively connected to the antenna via a direct current isolation circuit and an equalizer compensating for the differentiating frequency response of the antenna. The circuit also includes a logarithmic amplifier electrically connected to the equalizer and configured to generate a range of signals based on signals received at the antenna. The circuit further includes a peak detector receiving signals from the equalizer and configured to capture a peak value of the signals. The electromagnetic field event is detected at least in part based on the peak signal value.
77 Citations
18 Claims
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1. An apparatus configured to detect electromagnetic pulse (EMP) and intentional electromagnetic interference (IEMI) events, the apparatus comprising:
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a shielded loop magnetic antenna configured to receive signals representing at least a portion of a far field magnetic field generated from an electromagnetic pulse (EMP) or intentional electromagnetic interference (IEMI) event, the EMP or IEMI event having an electric field amplitude between 10 volts/meter and 100,000 volts/meter and a frequency of between 1 MHz to 10 GHz; and a circuit electrically connected to the shielded loop magnetic antenna, the circuit including; an equalizer connected to the shielded loop magnetic antenna via a direct current isolation circuit, the equalizer outputting signals having amplitudes independent of frequencies of detected signals, the equalizer compensating for a varying frequency response of the antenna; a logarithmic amplifier electrically connected to the equalizer and configured to generate a range of signals based on signals received at the antenna; a peak detector receiving signals from the logarithmic amplifier and configured to capture a peak value of the signals; and
wherein the peak detector determines a peak value of an electrical field of the EMP or IEMI event based on the captured signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of detecting high field electromagnetic pulse (EMP) and intentional electromagnetic interference (IEMI) events, the method comprising:
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monitoring a magnetic field of an electromagnetic wave using a shielded loop magnetic antenna configured to receive signals representing at least a portion of a far field magnetic field of the electromagnetic wave, the electromagnetic wave having an electric field amplitude between 10 volts/meter and 100,000 volts/meter and a frequency of between 1 MHz to 10 GHz; capturing a peak signal value of an analog signal representing a magnitude of the magnetic field at a peak detector that is connected to the shielded loop magnetic antenna; and determining the existence of a high field electromagnetic pulse (EMP) or intentional electromagnetic interference (IEMI) event based at least in part upon the captured peak signal value, wherein determining the existence of the high field EMP or IEMI event includes determining an electrical field based on the magnetic field. - View Dependent Claims (12, 13, 14, 15)
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16. An apparatus configured to detect high field electromagnetic pulse (EMP) and intentional electromagnetic interference (IEMI) events, the apparatus comprising:
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a first shielded loop magnetic antenna; a second shielded loop magnetic antenna oriented in a direction normal to the first shielded loop magnetic antenna; a third shielded loop magnetic antenna oriented in a direction normal to the first and second shielded loop magnetic antennas; wherein each of the first, second, and third shielded loop magnetic antennas are configured to receive signals representing at least a portion of a far field magnetic field of an electromagnetic wave, the electromagnetic wave having an electric field amplitude between 10 volts/meter and 100,000 volts/meter and a frequency of between 1 MHz to 10 GHz; a first circuit electrically connected to the first shielded loop magnetic antenna, the first circuit configured to detect a first peak value of signals received at the first shielded loop magnetic antenna; a second circuit electrically connected to the second shielded loop magnetic antenna, the second circuit configured to detect a second peak value of signals received at the second shielded loop magnetic antenna; a third circuit electrically connected to the third shielded loop magnetic antenna, the third circuit configured to detect a third peak value of signals received at the third shielded loop magnetic antenna; and a processor configured to detect an electromagnetic pulse (EMP) or intentional electromagnetic interference (IEMI) event based on the peak value detected at least in part based on the first peak value, the second peak value, and the third peak value. - View Dependent Claims (17, 18)
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Specification