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.
1 Assignment
0 Petitions
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.
-
Citations
19 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A non-linear junction detector comprising:
-
a spread spectrum transmitter that produces and transmits a transmit signal; a receiver that receives harmonic frequencies of the transmit signal; a display that displays; a received signal strength received by said receiver at a second harmonic frequency of said transmit signal; and a received signal strength received by said receiver at a third harmonic frequency of said transmit signal; wherein said spread spectrum transmitter further produces an RF transmit signal that contains digitally modulated audio packets designed to operate with an RF wireless audio receiver. - View Dependent Claims (14, 15, 16, 17)
-
-
18. A non-linear junction detector comprising:
-
a spread spectrum transmitter that produces and transmits a spread spectrum transmit signal; a receiver that receives harmonic frequencies of the transmit signal; a touch screen display that displays; a received signal strength received by said receiver at a second harmonic frequency of said spread spectrum transmit signal; and a semiconductor received signal strength received by said receiver at a third harmonic frequency of said spread spectrum transmit signal.
-
-
19. A non-linear junction detector comprising:
-
a variable power spread spectrum transmitter that utilizes OFDM modulation to produce and transmit a 2.4 GHz transmit signal; a receiver that receives harmonic frequencies of the transmit signal; a touch screen display that displays; a received signal strength received by said receiver at a second harmonic frequency of said 2.4 GHz transmit signal; and a received signal strength received by said receiver at a third harmonic frequency of said 2.4 GHz transmit signal.
-
Specification