Blind source separation of signals having low signal-to-noise ratio
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H03K-009/00
H04B-001/00
H04B-001/16
G06T-007/00
출원번호
US-0271512
(2016-09-21)
등록번호
US-9991908
(2018-06-05)
발명자
/ 주소
Ray, Gary A.
출원인 / 주소
The Boeing Company
대리인 / 주소
Ostrager Chong Flaherty & Broitman P.C.
인용정보
피인용 횟수 :
0인용 특허 :
6
초록▼
A blind source separation (BSS) system comprises means for gathering wideband signal power spectral information without using special Fourier transform hardware/software systems and without using extremely large signal memories. The method involves taking the combined energy output of a large set of
A blind source separation (BSS) system comprises means for gathering wideband signal power spectral information without using special Fourier transform hardware/software systems and without using extremely large signal memories. The method involves taking the combined energy output of a large set of BSS filters that are operating under a blind source separation algorithm that looks for signals of interest, along with instantaneous filter characteristics such as center frequency, bandwidth and spectral response, and records a weighted spread energy into a frequency- and time-based histogram. This information can then be used to compare against the BSS signal output and signal energy which does not correspond to existing signal output is added to additional BSS signal output. This system can operate in real time, but uses long-term averaging to enhance signal detection.
대표청구항▼
1. A method for performing blind source separation of signals, comprising: separating signals as a function of frequency using at least some of a plurality of filters;generating information vectors comprising respective data sets of parameter values of all separated signals regardless of their energ
1. A method for performing blind source separation of signals, comprising: separating signals as a function of frequency using at least some of a plurality of filters;generating information vectors comprising respective data sets of parameter values of all separated signals regardless of their energy, wherein each data set of parameter values making up an information vector comprises time of arrival, frequency and energy;adding the data sets of parameter values of the information vectors to a two-dimensional stochastic histogram with frequency along one axis and a consecutive stochastic diffogram along the other axis;identifying data sets of parameter values stored in the two-dimensional stochastic histogram corresponding to separated signals having energy less than a detection threshold; andtuning an unused one of the plurality of filters to pass signals having a frequency characteristic of separated signals having energy less than the detection threshold. 2. The method as recited in claim 1, further comprising: generating pulse descriptor words comprising respective data sets of parameter values of separated signals having energy greater than the detection threshold, wherein each data set of parameter values making up a pulse descriptor word comprises amplitude, time of arrival and frequency; andsubtracting from the two-dimensional stochastic histogram those data sets of parameter values which are equivalent to the data sets of parameter values of the pulse descriptor words. 3. The method as recited in claim 2, further comprising generating pulse descriptor words comprising respective data sets of parameter values of signals passed through the tuned filter of the plurality of filters. 4. The method as recited in claim 3, further comprising identifying a source of the signals passed through the tuned filter based on pulse descriptor words comprising the respective data sets of parameter values of the signals passed through the tuned filter. 5. The method as recited in claim 2, wherein the identifying step comprises finding events in the two-dimensional stochastic histogram. 6. The method as recited in claim 5, wherein the event finding uses a mean above mean technique. 7. The method as recited in claim 5, wherein the event finding comprises tracking barcodes that cover sparse regions of interest. 8. The method as recited in claim 1, wherein the two-dimensional stochastic histogram is a data array comprising a respective set of frequency bins for each frequency of a plurality of frequencies, the frequency bins in each set of frequency bins containing energy information for signals having respective times of arrival to form a respective consecutive stochastic diffogram. 9. The method as recited in claim 8, wherein each frequency bin has a respective priority value, the method further comprising: for each set of frequency bins, summing the priority values from each unoccupied frequency bin in that set of frequency bins; andtuning an unused one of the plurality of filters to pass signals having a frequency equal to the frequency of the set of frequency bins having a sum of priority values which is a maximum. 10. A system for processing received signals, comprising: a plurality of blind source separation channels, each blind source separation module comprising a respective filter and a respective blind source separation channel state machine associated with the respective filter; anda blind source separation control module communicatively coupled to the blind source separation channel state machines of the plurality of blind source separation channels,wherein at least some of the plurality of blind source separation channels are configured to separate signals as a function of frequency and the blind source separation channel state machines are configured to generate information vectors comprising respective data sets of parameter values of all separated signals regardless of their energy, wherein each data set of parameter values making up an information vector comprises time of arrival, frequency and energy, andwherein the blind source separation control module is configured to add the data sets of parameter values of the information vectors to a two-dimensional stochastic histogram with frequency along one axis and a consecutive stochastic diffogram along the other axis, identify data sets of parameter values stored in the two-dimensional stochastic histogram corresponding to separated signals having energy less than a detection threshold, and tune an unused one of the plurality of filters to pass signals having a frequency characteristic of separated signals having energy less than the detection threshold. 11. The system as recited in claim 10, further comprising a pulse descriptor word generation module communicatively coupled to the plurality of blind source separation channels, wherein: the pulse descriptor word generation module is configured to generate pulse descriptor words comprising respective data sets of parameter values of separated signals having energy greater than the detection threshold, wherein each data set of parameter values making up a pulse descriptor word comprises amplitude, time of arrival and frequency; andthe blind source separation control module is further configured to subtract from the two-dimensional stochastic histogram those data sets of parameter values which are equivalent to the data sets of parameter values of the pulse descriptor words. 12. The system as recited in claim 11, wherein the pulse descriptor word generation module is further configured to generate pulse descriptor words comprising respective data sets of parameter values of signals passed through the tuned filter of the plurality of filters. 13. The system as recited in claim 12, further comprising a processor communicatively coupled to the pulse descriptor word generation module and configured to identify a source of the signals passed through the tuned filter based on pulse descriptor words comprising the respective data sets of parameter values of the signals passed through the tuned filter. 14. The system as recited in claim 11, wherein the identifying operation performed by the blind source separation control module comprises finding events in the two-dimensional stochastic histogram. 15. The system as recited in claim 14, wherein the event finding uses a mean above mean technique. 16. The system as recited in claim 14, wherein the event finding comprises tracking barcodes that cover sparse regions of interest. 17. The system as recited in claim 10, wherein the two-dimensional stochastic histogram is a data array comprising a respective set of frequency bins for each frequency of a plurality of frequencies, the frequency bins in each set of frequency bins containing energy information for signals having respective times of arrival to form a respective consecutive stochastic diffogram. 18. The system as recited in claim 17, wherein each frequency bin has a respective priority value, the blind source separation control module being further configured to: for each set of frequency bins, sum the priority values from each unoccupied frequency bin in that set of frequency bins; andtune an unused one of the plurality of filters to pass signals having a frequency equal to the frequency of the set of frequency bins having a sum of priority values which is a maximum. 19. A method for performing blind source separation of signals, comprising: separating signals as a function of frequency using at least some of a plurality of filters;generating a first multiplicity of data sets of parameter values of all separated signals, wherein each data set of parameter values of the first multiplicity comprises time of arrival, frequency and energy;adding the first multiplicity of data sets of parameter values of the information vectors to a two-dimensional stochastic histogram with frequency along one axis and a consecutive stochastic diffogram along the other axis;generating a second multiplicity of data sets of parameter values of all separated signals having energy greater than a detection threshold, wherein each data set of parameter values of the second multiplicity comprises time of arrival, frequency and energy;subtracting from the two-dimensional stochastic histogram those data sets of parameter values of the first multiplicity which are equivalent to the data sets of parameter values of the second multiplicity;identifying data sets of parameter values stored in the two-dimensional stochastic histogram corresponding to separated signals having energy less than the detection threshold; andtuning an unused one of the plurality of filters to pass signals having a frequency characteristic of separated signals having energy less than the detection threshold. 20. The method as recited in claim 19, wherein the data sets of parameter values of the second multiplicity are pulse descriptor words.
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이 특허에 인용된 특허 (6)
Tindall, Jeffrey A., Digitally tuned digital radio frequency memory.
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