Recirculating cross-correlation detector
Abstract
A digital cross-correlation detector is provided in which two time-varying signals are correlated by repetitively comparing data samples stored in digital form to detect correlation between the two signals. The signals are sampled at a selected rate converted to digital form, and stored in separate locations in separate memories. When the memories are filled, the data samples from each memory are first fed word-by-word through a multiplier and summing circuit and each result is compared to the last in a peak memory circuit and if larger than the last is retained in the peak memory. Then the address line to leading signal memory is offset by one byte to affect one sample period delay of a known amount in that memory and the data in the two memories are then multiplied word-by-word once again and summed. If a new result is larger than a former sum, it is saved in the peak memory together with the time delay. The recirculating process continues with the address of the one memory being offset one additional byte each cycle until the address is shifted through the length of the memory. The correlation between the two signals is indicated by the peak signal storedmore »
- Inventors:
- Issue Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- OSTI Identifier:
- 5328397
- Application Number:
- ON: DE85017782
- Assignee:
- Dept. of Energy
- DOE Contract Number:
- AC05-84OR21400
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 47 OTHER INSTRUMENTATION; 42 ENGINEERING; FLOWMETERS; CORRELATIONS; SIGNALS; DIGITAL CIRCUITS; MEMORY DEVICES; ELECTRONIC CIRCUITS; MEASURING INSTRUMENTS; METERS; 440300* - Miscellaneous Instruments- (-1989); 420800 - Engineering- Electronic Circuits & Devices- (-1989)
Citation Formats
Andrews, Jr, W H, and Roberts, M J. Recirculating cross-correlation detector. United States: N. p., 1985.
Web.
Andrews, Jr, W H, & Roberts, M J. Recirculating cross-correlation detector. United States.
Andrews, Jr, W H, and Roberts, M J. Fri .
"Recirculating cross-correlation detector". United States.
@article{osti_5328397,
title = {Recirculating cross-correlation detector},
author = {Andrews, Jr, W H and Roberts, M J},
abstractNote = {A digital cross-correlation detector is provided in which two time-varying signals are correlated by repetitively comparing data samples stored in digital form to detect correlation between the two signals. The signals are sampled at a selected rate converted to digital form, and stored in separate locations in separate memories. When the memories are filled, the data samples from each memory are first fed word-by-word through a multiplier and summing circuit and each result is compared to the last in a peak memory circuit and if larger than the last is retained in the peak memory. Then the address line to leading signal memory is offset by one byte to affect one sample period delay of a known amount in that memory and the data in the two memories are then multiplied word-by-word once again and summed. If a new result is larger than a former sum, it is saved in the peak memory together with the time delay. The recirculating process continues with the address of the one memory being offset one additional byte each cycle until the address is shifted through the length of the memory. The correlation between the two signals is indicated by the peak signal stored in the peak memory together with the delay time at which the peak occurred. The circuit is faster and considerably less expensive than comparable accuracy correlation detectors.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 18 00:00:00 EST 1985},
month = {Fri Jan 18 00:00:00 EST 1985}
}