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US3700876A
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Reduced time delay auto-correlation signal processor
Assignee: United States Department of the Navy
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Filing: 1970-12-09
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Granted: 1972-10-24
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Expires: 1990-12-09
Abstract
Abstract A signal processor utilizing the auto-correlation technique for detecting a signal in the presence of noise. The device reduces both the required time delay and integrating time in conventional auto-correlation processes by the use of a (N) by (M) matrix analog correlator. The device accepts noise and signal which are assumed to be statistically independent and by linearly multiplying both (N) reiterated times and filtering out the d.c. or base band products from each multiplication, forms the final function for correlation. This process of linear multiplication is repeated over (M) parallel paths. The (N) reiterated linear multiplications reduce the required time delay to a small fraction. The (M) parallel paths reduce the required integrating time also to a very small fraction.
Inventors
- 👤 Lawrence S Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:19
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/19; G06G7/1928
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
113 words
An autocorrelation signal processor comprising: means for receiving a signal containing information and noise and for producing an electrical output signal representative of the received signal; a random noise generator having its output connected to said electrical output signal, said electrical signal and said random noise together comprising the signal to be processed; means for multiplying the signal to be processed by itself N successive time along M parallel paths, where N is an integer equal to or greater than 1 and M is an integer greater than 1; means for filtering individually each product of a multiplication; and means for autocorrelating said signal to be processed after the N multiplications and filterings.
Claim 2
Dependent Claim
113 words
An autocorrelation signal processor comprising: means for receiving a signal containing information and noise and for producing an electrical output signal representative of the received signal; a random noise generator having its output connected to said electrical output signal, said electrical signal and said random noise together comprising the signal to be processed; means for multiplying the signal to be processed by itself N successive time along M parallel paths, where N is an integer equal to or greater than 1 and M is an integer greater than 1; means for filtering individually each product of a multiplication; and means for autocorrelating said signal to be processed after the N multiplications and filterings.
Claim 3
Dependent Claim
15 words
A device as recited in claim 1 in which the receiving means comprises a transducer.
Claim 4
Dependent Claim
15 words
A device as recited in claim 1 in which the receiving means comprises an antenna.
Claim 5
Dependent Claim
16 words
A device as recited in claim 1 in which the filtering means comprises N high-pass filters.
Claim 6
Dependent Claim
88 words
A device as recited in claim 1 wherein the autocorrelating means comprises: a. M means for delaying said signal to be processed after N multiplications and filterings: b. M means for multiplying said signal to be processed after N multiplications and filterings by said delayed signal; c. M means for integrating the products of said M multiplications; wherein one of each said means recited in (a), (b) and (c) is connected in each of the M parallel paths; and, means for summing the outputs of the integrating means,
Claim 7
Dependent Claim
64 words
A device as defined in claim 5 in which the time delay associated with each of the M parallel paths is distinct from the time delays associated with the remaining M-1 parallel paths and in which the time period for integration associated with each of the M parallel paths is distinct from the time periods for integration associated with the remaining M-1 parallel paths.
Claim 8
Independent Claim
101 words
A device for reducing the time Period for integration in an autocorrelation processor comprising: means for receiving a signal to be processed; M parallel paths, where M is an integer greater than 1, each path being connected to the receiving means so that the signal to be processed is applied simultaneously to each path; wherein each of the M parallel paths includes: means for delaying said signal to be processed; means for multiplying said signal to be processed by the delayed signal; and, means for integrating the product of the multiplication; and, means for summing the outputs of the integrating means.
Claim 9
Independent Claim
101 words
A device for reducing the time Period for integration in an autocorrelation processor comprising: means for receiving a signal to be processed; M parallel paths, where M is an integer greater than 1, each path being connected to the receiving means so that the signal to be processed is applied simultaneously to each path; wherein each of the M parallel paths includes: means for delaying said signal to be processed; means for multiplying said signal to be processed by the delayed signal; and, means for integrating the product of the multiplication; and, means for summing the outputs of the integrating means.
Claim 10
Independent Claim
84 words
A device for increasing the signal-to-noise ratio of a received signal thereby reducing the delay time inherent in the auto-correlation process comprising: means for receiving the received signal; a random noise generator connected to the receiving means, the received signal and the random noise comprising the signal to be processed; means for multiplying the signal to be processed by itself N successive times, where N is an integer equal to or greater than 1; and, means for filtering individually each product of a multiplication.
Claim 11
Independent Claim
84 words
A device for increasing the signal-to-noise ratio of a received signal thereby reducing the delay time inherent in the auto-correlation process comprising: means for receiving the received signal; a random noise generator connected to the receiving means, the received signal and the random noise comprising the signal to be processed; means for multiplying the signal to be processed by itself N successive times, where N is an integer equal to or greater than 1; and, means for filtering individually each product of a multiplication.
Claim 12
Dependent Claim
47 words
The device as recited in claim 8 wherein: the received signal has a determinable bandwidth; the random noise has a determinable bandwidth; and, the bandwidth of the random noise occupies a frequency spectrum which is lower than and adjacent to the frequency spectrum of the signal bandwidth.
Claim 13
Dependent Claim
15 words
The device as recited in claim 9 wherein the filtering means comprise high pass filters.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |