Coherence Measurement Device Using Time-Domain Autocorrelation
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Solution Overview
Problem
Existing methods for measuring signal coherence rely on frequency analysis and power spectral density calculations, which are not well-suited for digital signal processing techniques.
Innovation Solution
A device and method using a digitizer, transformer, squarers, adder, subtractor, standard-deviation function block, mean generator, multiplier, and divider to measure coherence without frequency analysis or power spectral density calculations, involving signal digitization, transformation, squaring, addition, subtraction, standard deviation determination, and coherence calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequency analysis and power spectral density calculations are used to measure coherence, then measurement precision is improved, but device complexity and computational requirements increase
Solution Approach 1:
The patent extracts the essential coherence measurement function from complex spectral analysis by using only autocorrelation calculations. This removes unnecessary frequency analysis components while retaining the core coherence measurement capability, thereby reducing computational complexity and device requirements.
Solution Approach 2:
Instead of following the traditional approach of transforming signals to frequency domain for coherence measurement, the patent inverts the approach by working directly in the time domain using autocorrelation. This inversion eliminates the need for Fourier transforms and spectral density calculations, simplifying the overall processing pipeline.
2Measurement precision
If traditional optical coherence measurement methods are used, then measurement accuracy is maintained, but adaptability to digital signal processing techniques is reduced
Solution Approach 1:
The patent replaces traditional optical coherence measurement mechanisms with digital signal processing operations. By substituting physical optical interference methods with computational autocorrelation-based coherence measurement, the system achieves full compatibility with digital signal processing while maintaining measurement accuracy.
Solution Approach 2:
The patent changes the fundamental parameters of coherence measurement from frequency-domain spectral densities to time-domain autocorrelation functions. This parameter transformation enables the measurement to be performed using standard digital signal processing techniques, greatly enhancing adaptability to digital systems.
Data Source
AI summary
A device for and method of determining a coherence measurement for a signal that includes a digitizer for digitizing the signal, a transformer connected to the digitizer, a first squarer connected to the transformer, a second squarer connected to the digitizer, an adder connected to the first squarer and the second squarer, a subtractor connected to the first squarer and the second squarer, a standard-deviation function block connected to the subtractor, a mean generator connected to the adder, a first multiplier connected to the standard-deviation function block, and a divider connected to the output of the mean generator and the first multiplier.