Systems, methods, and devices for electronic spectrum management
Methods for tracking a signal origin by a spectrum analysis and management device are disclosed. Signal characteristics of other known emitters are used for obtaining a position of an emitter of a signal of interest. In one embodiment, frequency difference of arrival technique is implemented. In another embodiment, time difference of arrival technique is implemented.
1. A spectrum analysis and management device, comprising:
a radio frequency (RF) receiver;
a location receiver;
a memory; and
a processor coupled to the RF receiver, the location receiver, and the memory;
wherein the spectrum analysis and management device is operable to determine a Time Difference of Arrival or a Frequency Difference of Arrival for a signal of interest;
wherein the spectrum analysis and management device is operable to identify a location from which the signal of interest is transmitted;
wherein the spectrum analysis and management device is operable to determine whether at least four known emitters are present at the location;
wherein the spectrum analysis and management device is operable to obtain a cross ambiguity function for the signal of interest;
wherein the spectrum analysis and management device is operable to determine the cross ambiguity function does not converge to a solution;
wherein the spectrum analysis and management device is operable to determine a time shift of the signal of interest;
wherein the spectrum analysis and management device is operable to aggregate time shift data; and
wherein the spectrum analysis and management device is operable to resolve a position of an emitter from which the signal of interest is emitted.
2. The spectrum analysis and management device of claim 1 , wherein the location is identified based on coordinates provided from a Global Positioning System (GPS) receiver.
3. The spectrum analysis and management device of claim 1 , wherein the spectrum analysis and management device is operable to determine that the at least four known emitters are present at the location by comparing coordinates of the location to location data stored in a database.
4. The spectrum analysis and management device of claim 1 , further comprising a viewing device, wherein the viewing device is operable to display the position of the emitter.
5. The spectrum analysis and management device of claim 1 , wherein the at least four known emitters are present, wherein the spectrum analysis and management device is operable to collect and measure a Received Signal Strength (RSS) of the at least four known emitters and the signal of interest, and wherein the spectrum analysis and management device is operable to measure a frequency shift using the RSS.
6. The spectrum analysis and management device of claim 5 , wherein the RSS of the at least four known emitters and the signal of interest are collected and measured by using frequency, bandwidth, power, and distance values of the at least four known emitters and their respective signals and the signal of interest.
7. The spectrum analysis and management device of claim 1 , wherein less than four known emitters are present, wherein the spectrum analysis and management device is operable to measure an angle of arrival for the signal of interest and the less than four known emitters, and wherein the spectrum analysis and management device is operable to measure a frequency shift using the angle of arrival.
8. The spectrum analysis and management device of claim 7 , wherein the spectrum analysis and management device is operable to determine that at least two known emitters have their signal characteristics available when either the emitter of the signal of interest or the spectrum analysis and management device is moving.
9. The spectrum analysis and management device of claim 1 , wherein the spectrum analysis and management device is operable to filter the time shift data to reduce interference.
10. The spectrum analysis and management device of claim 1 , wherein the spectrum analysis and management device is operable to store the location from which the signal of interest is transmitted, a time of transmission at the location, and a duration of transmission at the location in a database.
11. A spectrum analysis and management device, comprising:
a radio frequency (RF) receiver;
a location receiver;
a memory; and
a processor coupled to the RF receiver, the location receiver, and the memory;
wherein the spectrum analysis and management device is operable to determine a Time Difference of Arrival or a Frequency Difference of Arrival for a signal of interest;
wherein the spectrum analysis and management device is operable to identify a location from which the signal of interest is transmitted;
wherein the spectrum analysis and management device is operable to determine whether at least four known emitters are present at the location;
wherein the spectrum analysis and management device is operable to obtain a cross ambiguity function for the signal of interest;
wherein the spectrum analysis and management device is operable to determine that the cross ambiguity function converges to a solution;
wherein the spectrum analysis and management device is operable to aggregate frequency shift data;
wherein the spectrum analysis and management device is operable to apply one or more filters to the aggregated frequency shift data; and
wherein the spectrum analysis and management device is operable to resolve a position of an emitter from which the signal of interest is emitted.
12. The spectrum analysis and management device of claim 11 , wherein the one or more filters includes a Kalman filter.
13. The spectrum analysis and management device of claim 11 , wherein the spectrum analysis and management device is operable to determine that the at least four known emitters are present at the location by comparing coordinates of the location to location data stored in a database.
14. The spectrum analysis and management device of claim 11 , wherein the at least four known emitters are present, wherein the spectrum analysis and management device is operable to collect and measure a Received Signal Strength (RSS) of the at least four known emitters and the signal of interest, and wherein the spectrum analysis and management device is operable to measure a frequency shift using the RSS.
15. The spectrum analysis and management device of claim 14 , wherein the RSS of the at least four known emitters and the signal of interest are collected and measured by using frequency, bandwidth, power, and distance values of the at least four known emitters and their respective signals and the signal of interest.
16. The spectrum analysis and management device of claim 11 , wherein less than four known emitters are present, wherein the spectrum analysis and management device is operable to measure an angle of arrival for the signal of interest and the less than four known emitters, and wherein the spectrum analysis and management device is operable to measure a frequency shift using the angle of arrival.
17. The spectrum analysis and management device of claim 11 , wherein the spectrum analysis and management device is operable to apply equations and additional filters to the aggregated frequency shift data.
18. The spectrum analysis and management device of claim 17 , wherein the additional filters include non-line-of-sight filters or the equations are at least one of the following types: weighted least squares equations and maximum likelihood equations.
19. The spectrum analysis and management device of claim 11 , wherein the spectrum analysis and management device is operable to store the location from which the signal of interest is transmitted, a time of transmission at the location, and a duration of transmission at the location in a database.
20. A spectrum analysis and management device, comprising:
a radio frequency (RF) receiver;
a Global Positioning System (GPS) receiver;
a memory;
a viewing device; and
a processor coupled to the RF receiver, the GPS receiver, the memory, and the viewing device;
wherein the spectrum analysis and management device is operable to determine a Time Difference of Arrival or a Frequency Difference of Arrival for a signal of interest;
wherein the spectrum analysis and management device is operable to identify a location from which the signal of interest is transmitted based on coordinates provided from the GPS receiver;
wherein the spectrum analysis and management device is operable to obtain a cross ambiguity function for the signal of interest;
wherein the spectrum analysis and management device is operable to determine that the cross ambiguity function converges to a solution;
wherein the spectrum analysis and management device is operable to aggregate frequency shift data;
wherein the spectrum analysis and management device is operable to apply one or more filters to the aggregated frequency shift data;
wherein the spectrum analysis and management device is operable to resolve a position of an emitter from which the signal of interest is emitted; and
wherein the viewing device is operable to display the position of the emitter.