Digital spread spectrum methods and apparatus for testing aircraft wiring
First Claim
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1. A method of determining impedance of a wire under test utilizing direct sequence spread spectrum (DSSS) techniques, said method comprising the steps of:
- (1) coupling the DSSS wire testing system to a connecting end of the wire under test;
(2) obtaining a pseudo-random noise (PN) code;
(3) multiplying a test signal by the PN code;
(4) transmitting the multiplied test signal from the DSSS wire testing system to the wire under test;
(5) receiving a reflected multiplied test signal from the wire under test; and
(6) determining a length of the wire under test from the reflected multiplied test signal.
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Abstract
A system and method that utilizes direct sequence spread spectrum signal (DSSS) encoding to enable testing of a live wire, wherein an original data signal is modified and then transmitted along the wire, and a reflected signal is collected and analyzed using correlation techniques to determine characteristics of the live wire, including the location of a fault.
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Citations
47 Claims
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1. A method of determining impedance of a wire under test utilizing direct sequence spread spectrum (DSSS) techniques, said method comprising the steps of:
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(1) coupling the DSSS wire testing system to a connecting end of the wire under test;
(2) obtaining a pseudo-random noise (PN) code;
(3) multiplying a test signal by the PN code;
(4) transmitting the multiplied test signal from the DSSS wire testing system to the wire under test;
(5) receiving a reflected multiplied test signal from the wire under test; and
(6) determining a length of the wire under test from the reflected multiplied test signal. - View Dependent Claims (2, 3)
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4. A method of using spread spectrum techniques for wire testing of a live wire, said method comprising the steps of:
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(1) generating a code;
(2) modifying a test signal using the code;
(3) transmitting the modified test signal on the live wire, wherein the modified test signal has a signal strength that is comparable to noise on the live wire;
(4) measuring a propagation delay of the modified test signal via the code; and
(5) determining impedance of the live wire. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method of using spread spectrum techniques for testing of a live wire, said method comprising the steps of:
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(1) spreading out a test signal for transmission on a live wire such that the spread test signal is comparable in strength to noise on the live wire;
(2) transmitting the spread test signal on the live wire;
(3) measuring a propagation delay of the spread test signal; and
(4) determining impedance of the live wire. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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Specification