Method of spectrum mapping and exploitation using distributed sensors

• US 8,755,469 B1
• Filed: 08/20/2012
• Issued: 06/17/2014
• Est. Priority Date: 04/15/2008
• Status: Expired due to Fees

• Current Assignee: US Department of The Army (Government of the United States of America)
• Original Assignee: United States Of America As Represented By The Secretary Of The Army (Government of the United States of America)
• Inventors: Su, Wei
• Primary Examiner(s): Ghulamali, Qutbuddin
• Application Number:
  US13/589,735
• Time in Patent Office: 666 Days
• Field of Search: 375/340, 375/342, 375/343, 375/262
• US Class Current: 375/340
• CPC Class Codes: H03D 2200/005 Analog to digital conversion
• CPC Class Codes: H03D 2200/006 Signal sampling
• CPC Class Codes: H04L 27/0006 Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio for spectrum sharing between different networks H04W16/14
• CPC Class Codes: H04L 27/0012 arrangements for identifying the type of modulation
• CPC Class Codes: H04L 27/2053 using more than one carrier, e.g. carriers with different phases
• CPC Class Codes: H04L 27/34 Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems

Abstract

A method for operating a distributed multi-sensor system for spectrum mapping and signal exploitation. The method includes selecting a plurality of distributed sensors including at least one or more clusters of distributed sensors, sending a request to the plurality of distributed sensors to collect signal snapshot copies, routing the signal snapshot copies or information from the plurality of distributed sensors as inputs to at least one fusion module, processing all inputs before sending any next request to the plurality of distributed sensors, optimizing the one or more clusters of distributed sensors, combining multiple distributed signal inputs in the at least one fusion module, and making a global decision. A system for spectrum mapping and signal exploitation and a storage medium encoded with machine-readable computer code for implementing the method are also disclosed.

Claims

1. A distributed multi-sensor system for spectrum mapping and signal exploitation, comprising:

a plurality of distributed sensors comprising a first set of sensors distributed in a first region and said first set of sensors configured to receive a plurality of non-cooperative non coherent and asynchronous signals, s(t), from an unknown transmission source of interest (SOI), each of said sensors of said first set having a sampling clock and a local memory, and providing a first set of receive signals, and said plurality of distributed sensors further comprising a second set of sensors including a cluster of sensors distributed in a second region and said second set of sensors configured to receive the plurality of non-cooperative non coherent and asynchronous signals, s(t), from the unknown transmission source (SOI), each of said cluster of sensors of said second set having a sampling clock and a local memory, and providing a plurality of received signals;

said plurality of distributed sensors being configured to collect timestamped data snapshots of the SOI;

a first fusion center disposed in said first region and being configured to receive timestamped signals from said first set of sensors;

a second fusion center disposed outside of said first region of distributed sensors and said second region of distributed sensors and being configured to receive timestamped signals from said second set of sensors and at least one of the received signals and information from said first fusion center;

said second fusion center further configured to process all signal inputs before sending any next request to said plurality of sensors and to optimize said plurality of sensors;

said second fusion center further configured to combine the distributed signal inputs from said plurality of sensors; and

said first fusion center, said second fusion center or a combination thereof further configured to make a global decision concerning said sensor signals.

2. The distributed multi-sensor system of claim 1 further comprising a signal exploitation unit (SEU) for spectrum mapping and exploitation and means for sending the global decision as output from second fusion module to said SEU.

3. The distributed multi-sensor system of claim 1 further comprising means disposed in said second fusion center for localizing said combined multiple distributed signal inputs before making a global decision.

4. The distributed multi-sensor system of claim 1 further comprising means disposed in said second fusion center for classifying said combined multiple distributed signal inputs before making a global decision.

5. The distributed multi-sensor system of claim 1 further comprising means disposed in said second fusion center for providing at least one of coarse channel analysis, coarse signal classification and coarse emitter localization before optimizing said plurality of distributed sensors.

6. The distributed multi-sensor system of claim 1 further comprising a data storage module coupled to said second fusion module for storing results obtained by said second fusion module.

7. The distributed multi-sensor system of claim 1 wherein said plurality of distributed sensors comprises at least one of thin sensors and thick sensors.

8. The distributed multi-sensor system of claim 1 wherein said fusion centers provide at least one of hard and soft decisions.

9. The distributed multi-sensor system of claim 1 further comprising a data storage module coupled to said SEU for storing information from said SEU.

10. The distributed multi-sensor system of claim 1 further comprising a data storage module coupled to said distributed sensors for storing information from said distributed sensors.

11. A system, comprising:

a first fusion center configured to receive a first signal set from a first set of sensors that represent a signal set, process the first signal set before sending a next request to the first set of sensors and combine individual signals from the first signal set to form a first combined signal; and

a second fusion center configured to receive a second signal set from a second set of sensors that represent the signal set, process the second signal set before sending a next request to the second set of sensors and combine individual signals from the second signal set to form a second combined signal,

wherein the first combined signal is combined with the second combined signal to produce an ultimate combined signal,

wherein the ultimate combined signal is used to produce a global decision,

wherein the first signal set is produced from the first set of sensors distributed in a first region,

wherein the first signal set is timestamped when received by the first fusion center,

wherein the first signal set is timestamped in accordance with a sampling clock of the first set of sensors,

wherein the first signal set is, when received by the first fusion center, multiple non-cooperative, non-coherent and asynchronous signals from an unknown transmission source of interest,

wherein the second signal set is produced from a second set of sensors distributed in a second region,

wherein the second signal set is timestamped when received by the second fusion center,

where the second signal set is timestamped in accordance with a sampling clock of the second set of sensors, and

wherein the second signal set is, when received by the second fusion center, multiple non-cooperative, non-coherent and asynchronous signals from the unknown transmission source of interest.

12. The system of claim 11, wherein:

the first fusion center is disposed in a first region,

the second fusion center is disposed outside the first region, and

the second fusion center is disposed outside the second region.

13. The system of claim 11, wherein the global decision is enacted.

14. The system of claim 11, wherein:

the first fusion center submits an initial request to the first set of sensors for the first signal set,

the first signal set is sent from the first set of sensors in response to the initial request to the first set of sensors,

the initial request to the first set of sensors is sent before the next request to the first set of sensors,

the second fusion center submits an initial request to the second set of sensors for the second signal set,

the second signal set is sent from the second set of sensors in response to the initial request to the second set of sensors,

the initial request to the second set of sensors is sent before the next request to the second set of sensors.

15. The system of claim 11, wherein the ultimate combined signal is classified prior to production of the global decision.

16. The system of claim 11, wherein:

the global decision is sent to a signal exploitation unit,

the signal exploitation unit spectrum maps the global decision, and

the signal exploitation unit exploits the global decision.

17. A non-transitory computer-readable medium configured to store computer-executable instructions that when executed by a processor cause the processor to perform a method, the method comprising:

receiving a first signal set, from a first set of sensors distributed in a first region, that represent a signal of interest, wherein the first signal set at reception includes timestamp information produced in accordance with a sampling clock of the first set of sensors;

processing the first signal set, wherein the first signal set is produced from the first set of sensors distributed in a first region;

combining individual signals from the first signal set to form a first combined signal, wherein the individual signals from the first signal set are non-cooperative, non-coherent and asynchronous signals from an unknown transmission source of interest;

sending a next request to the first set of sensors for a first subsequent signal set after processing the first signal set;

receiving a second signal set from a second set of sensors that represent the signal of interest, wherein the second signal set at reception includes timestamp information produced in accordance with a sampling clock of the second set of sensors;

processing the second signal set, wherein the second signal set is produced from the second set of sensors distributed in a second region;

combining individual signals from the second signal set to form a second combined signal, wherein the individual signals from the second signal set are non-cooperative, non-coherent and asynchronous signals from the unknown transmission source of interest;

sending a next request to the first set of sensors for a second subsequent signal set after processing the second signal set;

combining the first combined signal with the second combined signal to produce a total signal; and

making a global decision based, at least in part, on content of the total signal.

18. The non-transitory computer-readable medium of claim 17, the method comprising facilitating implementation of the global decision.

19. The non-transitory computer-readable medium of claim 17 being disposed in a fusion center.

20. The non-transitory computer-readable medium of claim 17, wherein a classification of the global signal is determined and where the classification is used in making the global decision.