Real-time RF/IF signature trigger
An RF/IF signature trigger for acquiring received RF signal data is generated by correlating the received RF signal data in the form of a time domain RF/IF signal, a detected RF/IF signal and/or a frequency domain RF/IF signal with a reference signal defined by a signal signature record representing desired/undesired RF/IF signal patterns, detected RF pulse shapes, special RF markers used specifically for triggering signal acquisitions, particular signal patterns of interest and the like. The resulting correlation factor continuously calculated in real time is compared with a variable correlation threshold such that when the correlation factor reaches the variable correlation threshold, either positive or negative, the RF/IF signature trigger is generated to acquire the received RF signal data for analysis.
1. An apparatus for generating an RF/IF signature trigger comprising:
means for correlating received RF/IF signal data with reference signal data defined by a signal signature record to produce continuously a correlation factor in real time; and
means for comparing the correlation factor with a variable correlation threshold to generate the RF/IF signature trigger when the correlation factor reaches the variable correlation threshold.
2. The apparatus as recited in claim 1 wherein the correlating means includes means for performing detection of the received RF/IF signal data to produce detected RF data for correlation with the reference signal data.
3. The apparatus as recited in claim 1 further comprising means for converting the received RF/IF signal data to frequency domain data for correlation with the reference signal data in the correlating means.
4. The apparatus as recited in claim 1 wherein the signal signature record comprises data selected from the group consisting of data derived from a captured signal-of-interest, data derived mathematically and data derived by using a signal processing tool.
5. The apparatus as recited in claim 1 further comprising means for storing the correlation factor over a period of time to provide a history for use in analyzing signal behavior over long time durations.
6. The apparatus as recited in claim 1 wherein the received RF/IF signal data comprises data selected from the group consisting of time domain RF/IF signal data, detected RF/IF signal data and frequency domain RF/IF signal data.
7. The apparatus as recited in claim 6 wherein the correlating means includes means for combining one or more of the time domain RF/IF signal data, detected RF/IF signal data and frequency domain RF/IF signal data as the received RF/IF signal data for correlation with the reference signal.
8. The apparatus as recited in claim 1 wherein the signal signature record comprises data selected from the group consisting of desired/undesired RF/IF signal patterns, detected RF pulse shapes, special RF markers used specifically for triggering signal acquisitions, particular signal patterns of interest and the like.
9. A method of generating an RF/IF signature trigger comprising the steps of:
correlating received RF/IF signal data with reference signal data defined by a signal signature record to produce continuously a correlation factor in real time; and
comparing the correlation factor with a variable correlation threshold to generate the RF/IF signature trigger when the correlation factor reaches the variable correlation threshold.
10. The method as recited in claim 9 wherein the correlating step includes the step of performing detection of the received signal data to produce detected RF data for correlation with the reference signal data.
11. The method as recited in claim 9 further comprising the step of converting the received RF/IF signal data to frequency domain data for correlation with the reference signal data in the correlating step.
12. The method as recited in claim 9 wherein the signal signature record comprises data selected from the group consisting of data derived from a captured signal-of-interest, data derived mathematically and data derived by using a signal processing tool.
13. The method as recited in claim 9 further comprising the step of storing the correlation factor over a period of time to provide a history for use in analyzing signal behavior over long time durations.
14. The method as recited in claim 9 wherein the received RF/IF signal data comprises data selected from the group consisting of time domain RF/IF signal data, detected RF/IF signal data and frequency domain RF/IF signal data.
15. The method as recited in claim 14 wherein the correlating step includes the step of combining one or more of the time domain RF/IF signal data, detected RF/IF signal data and frequency domain RF/IF signal data as the received RF/IF signal data for correlation with the reference signal.
16. The method as recited in claim 9 wherein the signal signature record comprises data selected from the group consisting of desired/undesired RF/IF signal patterns, detected RF pulse shapes, special RF markers used specifically for triggering signal acquisitions, particular signal patterns of interest and the like.
17. An apparatus for generating an RF/IF signature trigger comprising:
a correlator for correlating received RF/IF signal data with reference signal data defined by a signal signature record to produce continuously a correlation factor in real time; and
a comparator for comparing the correlation factor with a variable correlation threshold to generate the RF/IF signature trigger when the correlation factor reaches the variable correlation threshold.
18. The apparatus as recited in claim 17 wherein the correlator comprises a detector for performing detection of the received RF/IF signal data to produce detected RF data for correlation with the reference signal data.
19. The apparatus as recited in claim 17 further comprising a discrete Fourier transform for converting the received RF/IF signal data to frequency domain data for correlation with the reference signal data.
20. The apparatus as recited in claim 17 wherein the signal signature record comprises data selected from the group consisting of data derived from a captured signal-of-interest, data derived mathematically and data derived by using a signal processing tool.
21. The apparatus as recited in claim 17 further comprising a history memory for storing the correlation factor over a period of time to provide a history for use in analyzing signal behavior over long time durations.
22. The apparatus as recited in claim 17 wherein the received RF/IF signal data comprises data selected from the group consisting of time domain RF/IF signal data, detected RF/IF signal data and frequency domain RF/IF signal data.
23. The apparatus as recited in claim 22 wherein the correlator combines one or more of the time domain RF/IF signal data, detected RF/IF signal data and frequency domain RF/IF signal data as the received RF/IF signal data for correlation with the reference signal.
24. The apparatus as recited in claim 17 wherein the signal signature record comprises data selected from the group consisting of desired/undesired RF/IF signal patterns, detected RF pulse shapes, special RF markers used specifically for triggering signal acquisitions, particular signal patterns of interest and the like.