Spread spectrum non-linear junction detector
First Claim
1. A non-linear junction detector comprising:
- a transmitter that produces and transmits a digitally modulated spread spectrum transmit signal;
a receiver that receives a second harmonic response and a third harmonic response at harmonic frequencies of the digitally modulated spread spectrum transmit signal;
a display that displays;
a second harmonic signal strength received by said receiver at a second harmonic frequency of said digitally modulated spread spectrum transmit signal; and
a third harmonic signal strength received by said receiver at a third harmonic frequency of said digitally modulated spread spectrum transmit signal;
a receiver chain that correlates the digitally modulated spread spectrum transmit signal with the received second and third harmonic responses to produce a correlated response; and
an algorithm that compares the correlated response to a received signal strength.
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Accused Products
Abstract
A digital spread spectrum non-linear junction detector (NLJD) utilizes the 2.4 GHz transmission band to increase sensitivity to detect smaller electronics. The receiver chain of the NLJD pre-distorts the transmission signal and correlates the result with the response signal to differentiate between target responses and ambient interference signals. A touch screen display displays a signal strength received by the NLJDs receiver at a second harmonic frequency of the 2.4 GHz transmit signal and a signal strength received by the receiver at a third harmonic frequency of the transmit signal. A frequency swept response received by the receiver in response to the transmitted 2.4 GHz transmit signal is graphically displayed on the touch screen. The use of the 2.4 GHz band, touch screen, correlation based target differentiation and frequency swept response display improve the sensitivity and usability of the NLJD and increase the likelihood of it successfully performing its tasks.
10 Citations
12 Claims
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1. A non-linear junction detector comprising:
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a transmitter that produces and transmits a digitally modulated spread spectrum transmit signal; a receiver that receives a second harmonic response and a third harmonic response at harmonic frequencies of the digitally modulated spread spectrum transmit signal; a display that displays; a second harmonic signal strength received by said receiver at a second harmonic frequency of said digitally modulated spread spectrum transmit signal; and a third harmonic signal strength received by said receiver at a third harmonic frequency of said digitally modulated spread spectrum transmit signal; a receiver chain that correlates the digitally modulated spread spectrum transmit signal with the received second and third harmonic responses to produce a correlated response; and an algorithm that compares the correlated response to a received signal strength. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification