Scalable space frequency adaptive processing (SFAP)
Embodiments of the inventive concepts disclosed herein are directed to systems and methods for signal processing. An antenna array can receive signal information. A signal processing device can perform a time-domain-to-transform-domain transform with N transform domain bins, on the signal information. The signal processing device can determine N covariance matrices each corresponding to a respective one of the N transform domain bins. The signal processing device can group covariance matrices from the N covariance matrices into groups of M covariance matrices. Each group can correspond to a respective group of M adjacent bins from the N bins. The signal processing device can produce a combined spatial covariance matrix for each group of M covariance matrices, by performing a weighted combination of covariance matrices within the respective group of M covariance matrices. The signal processing device can calculate spatial weights from each of the spatial covariance matrices, for anti-jamming processing.
1. A system for signal processing, comprising:
an antenna array configured to receive signal information; and
a signal processing device comprising one or more processors, the signal processing device configured to:
perform a time domain to transform domain transform (TTT) with N transform domain bins, on the signal information;
determine N covariance matrices each corresponding to a respective one of the N transform domain bins;
group covariance matrices from the N covariance matrices into groups of M covariance matrices, each group corresponding to a respective group of M adjacent transform domain bins from the N transform domain bins;
produce a combined spatial covariance matrix for each group of M covariance matrices, by performing a weighted combination of covariance matrices within the respective group of M covariance matrices; and
calculate spatial weights from each of the spatial covariance matrices, for anti-jamming or interference mitigation processing to control the antenna array.
2. The system of claim 1 , wherein the antenna array is configured to receive the signal information in a radio frequency (RF) signal, the system further comprising:
an analog to digital converter (ADC) configured to convert an analog signal from RF circuitry coupled to the antenna array, into a digital signal, wherein the signal processing device is configured to perform the TTT on the digital signal.
3. The system of claim 1 , wherein the antenna array is configured to receive the signal information in a global navigation satellite system (GNSS) signal.
4. The system of claim 1 , wherein the signal processing device is configured to control the antenna array using a first value for M at a first time instance, and a second value for M at a second time instance.
5. The system of claim 1 , wherein the signal processing device is configured to set or receive a value for M in response to a level of interference detected in signals received via the antenna array.
6. The system of claim 1 , wherein the signal processing device is configured to perform an inverse TTT (ITTT) with N bins.
7. The system of claim 1 , wherein antenna elements of the antenna array are steered or controlled according to the calculated spatial weights.
8. The system of claim 1 , further comprising an excision component configured to filter a result of the anti-jamming or interference mitigation processing, at a resolution matched to the N bins.
9. A method for interference mitigation, comprising:
receiving signal information via an antenna array;
performing, by a signal processor, a time domain to transform domain transform (TTT) with N transform domain bins, on the signal information;
determining, by the signal processor, N covariance matrices each corresponding to a respective one of the N transform domain bins;
grouping covariance matrices from the N covariance matrices into groups of M covariance matrices, each group corresponding to a respective group of M adjacent transform domain bins from the N transform domain bins;
producing, by the signal processor, a combined spatial covariance matrix for each group of M covariance matrices, by performing a weighted combination of covariance matrices within the respective group of M covariance matrices; and
calculating, by the signal processor, spatial weights from each of the spatial covariance matrices, for anti-jamming or interference mitigation processing, to control the antenna array.
10. The method of claim 9 , comprising:
receiving, by the antenna array, the signal information in a radio frequency (RF) signal;
converting, by an analog to digital converter (ADC), an analog signal from RF circuitry coupled to the antenna array, into a digital signal; and
performing, by the signal processor, the TTT on the digital signal.
11. The method of claim 9 , comprising receiving, by the antenna array, the signal information in a global navigation satellite system (GNSS) signal.
12. The method of claim 9 , comprising controlling, by the signal processor, the antenna array using a first value for M at a first time instance, and a second value for M at a second time instance.
13. The method of claim 9 , comprising setting a value for M in response to a level of interference detected in signals received via the antenna array.
14. The method of claim 9 , comprising performing, by the signal processor, an inverse TTT (ITTT) with N bins.
15. The method of claim 9 , comprising steering antenna elements of the antenna array according to the calculated spatial weights.
16. The method of claim 9 , comprising filtering, by an excision component, a result of the anti-jamming or interference mitigation processing, at a resolution matched to the N bins.
17. A global navigation satellite system (GNSS) device, comprising:
an antenna array configured to receive GNSS signal information; and
a signal processing device comprising one or more processors, the signal processing device configured to:
perform a fast Fourier transform (FFT) with N frequency bins, on the GNSS signal information;
determine N covariance matrices each corresponding to a respective one of the N frequency bins;
group covariance matrices from the N covariance matrices into groups of M covariance matrices, each group corresponding to a respective group of M adjacent frequency bins from the N frequency bins;
produce a combined spatial covariance matrix for each group of M covariance matrices, by performing a weighted combination of covariance matrices within the respective group of M covariance matrices; and
calculate spatial weights from each of the spatial covariance matrices, for anti-jamming or interference mitigation processing to control the antenna array.
18. The GNSS device of claim 17 , wherein the signal processing device is configured to control the antenna array using a first value for M at a first time instance, and a second value for M at a second time instance.
19. The GNSS device of claim 17 , wherein the signal processing device is configured to set or receive a value for M in response to a level of interference detected in signals received via the antenna array.
20. The GNSS device of claim 17 , wherein the signal processing device is configured to perform an inverse FFT (IFFT) with N bins.