REMOTE DETECTION OF ELECTRONIC DEVICES
First Claim
Patent Images
1. An apparatus for remotely locating solid-state electronics, comprising in combination:
- an RF generator for generating a chosen frequency RF signal;
a signal splitter for dividing the RF signal into a transmitted portion and a reference portion;
a modulator for encoding a chosen code onto the transmitted portion of the RF signal;
a controller for generating the chosen code, and for directing the code to said modulator;
a power amplifier for amplifying the encoded RF signal;
an antenna for transmitting the amplified, encoded RF signal;
an antenna for receiving a similarly encoded second harmonic frequency of the encoded RF signal;
a demodulator for receiving the second harmonic frequency and the chosen code delayed by a selected time interval from said controller, and for removing the modulation from the second harmonic frequency;
a frequency doubler for doubling the frequency of the reference portion of the RF signal;
a mixer for comparing the doubled frequency of the reference portion of the RF signal with the demodulated second harmonic frequency, and for generating a DC signal if the doubled frequency of the reference portion of the RF signal is correlated with the demodulated second harmonic frequency; and
a computer for receiving the DC signal, for directing said controller and for calculating distance between located solid-state electronics and said transmitting antenna.
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Abstract
An apparatus and method for detecting solid-state electronic devices are described. Non-linear junction detection techniques are combined with spread-spectrum encoding and cross correlation to increase the range and sensitivity of the non-linear junction detection and to permit the determination of the distances of the detected electronics. Nonlinear elements are detected by transmitting a signal at a chosen frequency and detecting higher harmonic signals that are returned from responding devices.
12 Citations
30 Claims
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1. An apparatus for remotely locating solid-state electronics, comprising in combination:
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an RF generator for generating a chosen frequency RF signal; a signal splitter for dividing the RF signal into a transmitted portion and a reference portion; a modulator for encoding a chosen code onto the transmitted portion of the RF signal; a controller for generating the chosen code, and for directing the code to said modulator; a power amplifier for amplifying the encoded RF signal; an antenna for transmitting the amplified, encoded RF signal; an antenna for receiving a similarly encoded second harmonic frequency of the encoded RF signal; a demodulator for receiving the second harmonic frequency and the chosen code delayed by a selected time interval from said controller, and for removing the modulation from the second harmonic frequency; a frequency doubler for doubling the frequency of the reference portion of the RF signal; a mixer for comparing the doubled frequency of the reference portion of the RF signal with the demodulated second harmonic frequency, and for generating a DC signal if the doubled frequency of the reference portion of the RF signal is correlated with the demodulated second harmonic frequency; and a computer for receiving the DC signal, for directing said controller and for calculating distance between located solid-state electronics and said transmitting antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for remotely locating solid-state electronics, comprising the steps of:
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generating a chosen frequency RF signal; dividing the RF signal into a transmitted portion and a reference portion; encoding a chosen code onto the transmitted portion of the RF signal; amplifying the encoded RF signal; transmitting the amplified, encoded RF signal; receiving a similarly encoded second harmonic frequency of the encoded RF signal; removing the encoding from the second harmonic frequency; doubling the frequency of the reference portion of the RF signal; comparing the doubled frequency of the reference portion of the RF signal with the second harmonic frequency for which the encoding has been removed; generating a DC signal if the doubled frequency of the reference portion of the RF signal is correlated with the second harmonic frequency for which the encoding has been removed; and calculating a distance between located solid-state electronics and the location of said step of transmitting the amplified, encoded RF signal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification