US3774019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Correlation system with recirculating reference signal for increasing total correlation delay
Assignee: Unisys Corp
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Filing: 1971-09-20
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Granted: 1973-11-20
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Expires: 1991-09-20
Abstract
Abstract A correlation system includes a delay line correlator comprising two tapped delay lines where an input signal and a reference signal are applied to the lines, respectively, such that the signals scan past each other at a relative velocity with respect to each other for obtaining the correlation function therebetween. Means are included in the system for repetitively inserting the reference signal into the correlator for increasing the total correlation delay time thereof.
Inventors
- 👤 C Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:39
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/19; G06G7/195
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
141 words
A correlator system for correlating a finite duration input signal with a corresponding finite duration reference signal, said input signal having an arbitrary arrival time in a predetermined time interval and a small duration compared to said time interval, comprising correlator means having a correlation delay time substantially less than said predetermined time interval and responsive to said signals for propagating both said signals through said correlator means in opposite directions with respect to each other for scanning said signals past each other at a relative velocity with respect to each other to obtain the correlation function therebetween, and means for repetitively inserting said finite duration reference signal into said correlator means for increasing the total correlation delay time of said correlator means to provide a correlation peak with respect to said input signal in accordance with said arbitrary arrival time.
Claim 2
Dependent Claim
141 words
A correlator system for correlating a finite duration input signal with a corresponding finite duration reference signal, said input signal having an arbitrary arrival time in a predetermined time interval and a small duration compared to said time interval, comprising correlator means having a correlation delay time substantially less than said predetermined time interval and responsive to said signals for propagating both said signals through said correlator means in opposite directions with respect to each other for scanning said signals past each other at a relative velocity with respect to each other to obtain the correlation function therebetween, and means for repetitively inserting said finite duration reference signal into said correlator means for increasing the total correlation delay time of said correlator means to provide a correlation peak with respect to said input signal in accordance with said arbitrary arrival time.
Claim 3
Dependent Claim
32 words
The system of claim 1 in which said correlator means includes first and second delay line means for effectively propagating both said input signal and said reference signal, respectively, past each other.
Claim 4
Dependent Claim
36 words
The system of claim 2 in which said means for repetitively inserting includes means for inserting said reference signal into said correlator means at intervals related to twice the delay time of said delay line means.
Claim 5
Dependent Claim
15 words
The system of claim 1 in which said correlator means comprises a microwave acoustic correlator.
Claim 6
Dependent Claim
22 words
The system of claim 1 further including means for time inverting one of said signals prior to application to said correlator means.
Claim 7
Dependent Claim
193 words
A correlator system for use in a target ranging system having a predetermined range time interval and including a signal source for providing a first finite duration signal of small duration compared to said time interval and means for time inverting said first signal to providing a second finite duration signal, said target ranging system transmitting one of said first and second signals and receiving return signals thereof reflected from said targets at arbitrary arrival times in said time interval, said correlator system comprising correlator means having a correlation delay time substantially less than said predetermined time interval and responsive to said return signals and to the other of said first and second signals for propagating both said signals through said correlator means in opposite directions with respect to each other for scanning said signals past each other at a relative velocity with respect to each other to obtain the correlation function therebetween, and means for repetitively inserting said other signal into said correlator means for increasing the total correlation delay time of said correlator means to provide correlation peaks with respect to said return signals in accordance with said arbitrary arrivel times.
Claim 8
Dependent Claim
193 words
A correlator system for use in a target ranging system having a predetermined range time interval and including a signal source for providing a first finite duration signal of small duration compared to said time interval and means for time inverting said first signal to providing a second finite duration signal, said target ranging system transmitting one of said first and second signals and receiving return signals thereof reflected from said targets at arbitrary arrival times in said time interval, said correlator system comprising correlator means having a correlation delay time substantially less than said predetermined time interval and responsive to said return signals and to the other of said first and second signals for propagating both said signals through said correlator means in opposite directions with respect to each other for scanning said signals past each other at a relative velocity with respect to each other to obtain the correlation function therebetween, and means for repetitively inserting said other signal into said correlator means for increasing the total correlation delay time of said correlator means to provide correlation peaks with respect to said return signals in accordance with said arbitrary arrivel times.
Claim 9
Dependent Claim
33 words
The correlator system of claim 6 in which said correlator means includes first and second delay line means for effectively propagating both said return signal and said other signal, respectively, past each other.
Claim 10
Dependent Claim
37 words
The correlator system of claim 7 in which said means for repetitively inserting includes means for inserting said other signal into said correlator means at intervals related to twice the delay time of said delay line means.
Claim 11
Dependent Claim
16 words
The correlator system of claim 6 in which said correlator means comprises a microwave acoustic correlator.
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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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |