US4933916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase measurements using pseudo-random code
Assignee: Canadian Patents and Development Ltd
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Filing: 1985-11-01
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Granted: 1990-06-12
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Expires: 2005-11-01
Abstract
Abstract Signal phase delay may be accurately measured by transmitting a pseudo-random noise coded reference signal, deriving in-phase and quadrature components of the received coded signal and then separately decoding the in-phase and quadrature components. This technique effectively compresses the transmitted signal pulse to a very narrow width (thereby simplifying discrimination of separate pulses with similar arrival times) while magnifying the pulse amplitude (thereby enhancing the signal to noise ratio).
Inventors
- 👤 George A. May
- 👤 David M. Farmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:30
CPC Classifications
G; G01; G01S; G01S11/00; G01S11/02; G01S11/14
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
146 words
Apparatus for measuring signal phase delay, said apparatus comprising: (a) pseudo-random noise code modulator means for pseudo-random noise code modulating a reference signal; (b) transmitter means for transmitting said coded signal; (c) receiver means for receiving said transmitted signal; (d) first signal multiplier means for multiplying said received signal with said reference signal to produce a first vector component of said received signal; (e) second signal multiplier means for multiplying said received signal with a 90° phase shifted replica of said reference signal to produce a second vector component of said received signal; (f) first filter means for removing high frequency signal components of said first vector component; (g) second filter means for removing high frequency signal components of said second vector component; (h) first signal decoder means for decoding said first vector component; and, (i) second signal decoder means for decoding said second vector component.
Claim 2
Dependent Claim
146 words
Apparatus for measuring signal phase delay, said apparatus comprising: (a) pseudo-random noise code modulator means for pseudo-random noise code modulating a reference signal; (b) transmitter means for transmitting said coded signal; (c) receiver means for receiving said transmitted signal; (d) first signal multiplier means for multiplying said received signal with said reference signal to produce a first vector component of said received signal; (e) second signal multiplier means for multiplying said received signal with a 90° phase shifted replica of said reference signal to produce a second vector component of said received signal; (f) first filter means for removing high frequency signal components of said first vector component; (g) second filter means for removing high frequency signal components of said second vector component; (h) first signal decoder means for decoding said first vector component; and, (i) second signal decoder means for decoding said second vector component.
Claim 3
Dependent Claim
14 words
Apparatus as defined in claim 1, wherein said transmitted signal is an electromagnetic signal.
Claim 4
Dependent Claim
14 words
Apparatus as defined in claim 1, wherein said transmitted signal is an acoustic signal.
Claim 5
Dependent Claim
13 words
Apparatus aas defined in claim 3, wherein said transmitted signal is transmitted underwater.
Claim 6
Dependent Claim
18 words
Apparatus as defined in claim 1 wherein said transmitted signal has a frequency greater than about 10 kHz.
Claim 7
Dependent Claim
18 words
Apparatus as defined in claim 3, wherein said transmitted signal has a frequency greater than about 10 kHz.
Claim 8
Dependent Claim
18 words
Apparatus as defined in claim 4, wherein said transmitted signal has a frequency greater than about 10 kHz.
Claim 9
Independent Claim
55 words
A method of measuring signal phase delay, comprising: (a) pseudo-random noise code modulating a reference signal; (b) transmitting said coded signal; (c) receiving said transmitted signal; (d) multiplying said received signal with said reference signal to derive in-phase and quadrature components of said received signal; and subsequently, (e) separately decoding said in-phase and quadrature components.
Claim 10
Independent Claim
55 words
A method of measuring signal phase delay, comprising: (a) pseudo-random noise code modulating a reference signal; (b) transmitting said coded signal; (c) receiving said transmitted signal; (d) multiplying said received signal with said reference signal to derive in-phase and quadrature components of said received signal; and subsequently, (e) separately decoding said in-phase and quadrature components.
References Cited (Backward Citations)
US4208734A
Cited
US4203164A
Cited
US3430149A
Cited
US4090145A
Cited
US3761829A
Cited
US3868686A
Cited
US3970946A
Cited
US4297700A
Cited
US3940731A
Cited
US4032763A
Cited
US4024540A
Cited
US4307616A
Cited
US4521779A
Cited
US4357610A
Cited
US4359735A
Cited
US4445118A
Cited
US4575861A
Cited
US4754465A
Cited
US4646096A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |