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Signal detection algorithms for interferometric sensors with harmonic phase modulation: miscalibration of modulation
Applied Optics
|September 6, 2018
Summary
This study introduces an analytical tool to calculate phase errors from modulation miscalibration. The developed equations accurately predict errors for amplitude and phase, verified by numeric modeling.
Area of Science:
- Physics
- Measurement Science
Background:
- Accurate phase error calculation is crucial for signal processing.
- Miscalibration of modulation parameters can introduce significant phase errors.
Purpose of the Study:
- To develop an analytical apparatus for calculating phase error due to modulation parameter miscalibration.
- To analyze miscalibration effects on amplitude and start phase in harmonic modulation.
- To compare conventional and advanced demodulation algorithms regarding phase error immunity.
Main Methods:
- Development of analytical equations for phase error calculation.
- Consideration of harmonic modulation with amplitude and start phase miscalibration.
- Evaluation of a 4-point least-squares algorithm and a 4+1 algorithm.
- Verification of analytical predictions using numeric modeling.
Main Results:
- The developed analytical apparatus accurately calculates phase error from miscalibrated modulation parameters.
- The 4+1 algorithm demonstrates high immunity to phase errors compared to the conventional 4-point algorithm.
- Numeric modeling validates the predictions of the analytical equations.
Conclusions:
- The analytical apparatus provides a reliable method for assessing phase error in modulated signals.
- The 4+1 algorithm offers improved performance in the presence of modulation parameter uncertainties.
- This work contributes to more robust signal demodulation techniques.
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