Wideband digital spectrometer
First Claim
1. A spectrometer, comprising:
- an input port, configured to receive a wideband radio frequency signal having a first signal component of a first amplitude and a second signal component having a second amplitude, said second signal communicating information;
a wideband signal digitizer, having a maximum dynamic range less than a ratio of the amplitude of the first signal component and a minimum amplitude of an information-bearing component of the second signal component required for extraction of information therefrom;
an estimator configured to estimate a characteristic of the first signal component; and
a filter, responsive to the estimated characteristic, configured to alter the ratio of the first signal component and the information-bearing component, without introducing substantial nonlinear distortion, to a ratio within the maximum dynamic range.
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Accused Products
Abstract
A method for reducing interference, comprising receiving a wideband signal, having at least one large amplitude component; adaptively modifying the wideband signal with respect to at least one high intensity component without substantial introduction of non-linear distortion, while reducing a residual dynamic range thereof; digitizing the modified wideband signal to capture information describing at least the high intensity signal at a sampling rate sufficient to extract modulated information present within the wideband signal at an upper limit of the band. The system analyzes a spectral characteristic of the wideband signal; and extracts adaptation parameters for the adaptive filtering. The system therefore provides both large net dynamic range and wideband operation. Preferably, the digitizer and filter, and part of the spectral characteristic analyzer is implemented in using superconducting circuit technology, with, for example low temperature superconducting digital signal processing components, and high temperature superconducting analog filtering components.
37 Citations
28 Claims
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1. A spectrometer, comprising:
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an input port, configured to receive a wideband radio frequency signal having a first signal component of a first amplitude and a second signal component having a second amplitude, said second signal communicating information; a wideband signal digitizer, having a maximum dynamic range less than a ratio of the amplitude of the first signal component and a minimum amplitude of an information-bearing component of the second signal component required for extraction of information therefrom; an estimator configured to estimate a characteristic of the first signal component; and a filter, responsive to the estimated characteristic, configured to alter the ratio of the first signal component and the information-bearing component, without introducing substantial nonlinear distortion, to a ratio within the maximum dynamic range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for reducing interference in a saturable circuit, comprising:
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receiving a wideband electromagnetic radiation signal, having at least one large amplitude component; adaptively filtering the at least one large amplitude component to reduce a dynamic range of a wideband residual of the wideband electromagnetic radiation signal; digitizing the wideband residual at a sample rate of at least 500 megasamples per second, at a sampling rate in excess of twice a frequency of the at least one large amplitude component; analyzing a spectral characteristic of the digitized residual; and extracting adaptation parameters from the digitized residual for said adaptively filtering, wherein said analyzing comprises digitally computing a correlation, and wherein said analyzing comprises computing a signal transform in dependence on the correlation. - View Dependent Claims (12, 13, 14)
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15. A method for receiving at least one signal of interest, comprising:
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receiving a transmitted wideband electromagnetic radiation signal, having at least one signal component above 500 MHz; adaptively filtering the wideband electromagnetic radiation signal; quantizing an amplitude of the filtered wideband electromagnetic radiation signal, at a quantization rate of at least 1 GHz; extracting adaptation parameters from the quantized amplitudes for said adaptively filtering; and multiplying, at an effective throughput of at least the quantization rate, a time series representing the quantized amplitude, to extract information from the wideband electromagnetic radiation signal. - View Dependent Claims (16, 17)
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18. A receiver adapted to receive at least one signal of interest, comprising:
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an input configured to receive a transmitted wideband electromagnetic radiation signal, having at least one signal component above 500 MHz; an adaptive filter, configured to receive said signal and to produce therefrom a filtered wideband electromagnetic radiation signal; a quantizer, configured to quantize an amplitude of the filtered wideband electromagnetic radiation signal, at a quantization rate of at least 1 GHz; a processor configured to produce adaptation parameters based on the quantized amplitudes, said adaptation parameters being provided to said adaptive filter for control of a filtering thereby; and a multiplier, configured to multiply, at an effective throughput of at least the quantization rate, a time series representing the quantized amplitude, to extract information from the wideband electromagnetic radiation signal. - View Dependent Claims (19, 20, 21, 22)
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23. A radio receiver, comprising:
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an array of inputs configured to receive components of a wideband radio frequency signal having a first signal component of a first amplitude and a second signal component having a second amplitude, said second signal communicating information; a controllable linear processing matrix, configured to receive the array of inputs and to combine the at least two representations derived from the array of inputs to alter a ratio of the first signal component to the second signal component; and a processor, configured to receive at least one signal component derived from the array of inputs, to digitize the signal component above a Nyquist rate thereof, substantially without frequency translation thereof, and to control the controllable linear processing matrix in dependence thereon. - View Dependent Claims (24, 25, 26, 27, 28)
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Specification