PGC Demodulator Phase Sensitivity Calibration
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Solution Overview
Problem
Current methods for measuring phase sensitivity of phase generated carrier (PGC) demodulators are indirect, complex, and prone to calculation errors, requiring extensive equipment and multiple measurand measurements.
Innovation Solution
An automatic phase sensitivity calibration method is introduced, involving the addition of a calibration signal with a known phase through a phase modulator, demodulation using the PGC algorithm, and obtaining the demodulated output value corresponding to a unit phase to calculate phase sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the indirect Bessel function ratio method is used to measure phase sensitivity, then the measurement can be performed, but the method is complicated, requires extensive equipment, and is susceptible to large calculation errors
Solution Approach 1:
The patent extracts only the necessary functional components for phase sensitivity measurement, removing unnecessary equipment and complex processing steps. The simplified system uses basic signal generation and detection capabilities already present in PGC demodulators, eliminating the need for extensive external measurement equipment while maintaining measurement accuracy through direct calibration signals
Solution Approach 2:
The PGC demodulator performs self-calibration by generating internal calibration signals and processing them through its own demodulation algorithm. This self-service approach eliminates the need for external measurement equipment and complex indirect measurement methods, allowing the system to determine its own phase sensitivity through automated internal testing
2Measurement precision
If the indirect Bessel function ratio method is used, then phase sensitivity can be characterized, but the process requires measuring many measurands and involves complex calculations
Solution Approach 1:
The patent applies preliminary action by pre-calculating the expected demodulated output for a known unit phase input. This allows the system to directly compare theoretical expectations with actual measurements, eliminating the need for complex iterative calculations and multiple measurand measurements required by indirect methods
Solution Approach 2:
The patent replaces complex mechanical measurement procedures with electronic signal processing. Instead of physically measuring multiple different measurands through complex apparatus, the system uses electronic calibration signals and digital signal processing to directly determine phase sensitivity, significantly reducing measurement time and complexity
3Measurement precision
If additional calibration equipment and methods are added to measure phase sensitivity, then measurement capability is improved, but the system complexity and cost increase
Solution Approach 1:
The patent makes the PGC demodulator multi-functional by enabling it to perform both its primary demodulation function and self-calibration function using the same hardware components. The existing signal generation and processing capabilities are utilized for dual purposes, eliminating the need for separate dedicated calibration equipment and simplifying system implementation
Solution Approach 2:
The system performs self-calibration using its own internal resources, generating calibration signals and processing them through its existing demodulation pathway. This self-service capability eliminates the need for external calibration equipment, reducing both system complexity and manufacturing costs while maintaining measurement accuracy
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method allows for quick and convenient calibration of phase sensitivity with lower costs and no additional noise, maintaining the integrity of the demodulation process, and is universally applicable to various PGC solutions.
Implementation Method 1
adding an additional calibration signal with a phase of known magnitude through a phase modulator
Data Source
AI summary
The present disclosure provides a phase sensitivity calibration method based on a phase generated carrier (PGC) technology, which is characterized in that in the operation process of a PGC algorithm, an additional calibration signal with a phase of known magnitude is applied through a phase modulator. This signal is demodulated through an arctangent algorithm or a differential cross multiplication algorithm, and a demodulated output value corresponding to a unit phase in the algorithm is obtained. The phase of known magnitude can be obtained by converting a carrier modulation depth parameter according to a certain ratio.