Coherent Receiver Phase Difference and Delay Detection
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Solution Overview
Problem
Coherent receivers face challenges in accurately detecting phase differences and time delays due to non-orthogonal hybrid phase angles and unequal signal path lengths, which affect signal processing accuracy.
Innovation Solution
A method and apparatus that acquire and process signals from coherent receivers using frequency shifts to calculate phase differences and delays through cross-correlation and autocorrelation operations, eliminating the need for additional compensation units and simplifying detection steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional compensation units are added to correct phase difference and delay, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The coherent receiver uses its own output signals to detect and compensate for phase difference and delay. The I-channel and Q-channel signals are processed through cross-correlation and autocorrelation operations to obtain phase difference and delay information, which is then used to generate compensation signals. This self-service approach eliminates the need for external compensation units while maintaining measurement precision.
Solution Approach 2:
The system implements feedback by using the detected phase difference and delay information to generate compensation signals that are fed back into the signal processing path. The compensation signals are combined with the original signals to correct the phase and delay errors, creating a closed-loop system that improves measurement precision without adding external compensation hardware.
2Measurement precision
If complex signal processing is performed to detect phase difference and delay, then measurement precision is improved, but processing time increases
Solution Approach 1:
The system performs preliminary signal processing by pre-computing the cross-correlation and autocorrelation functions for the I-channel and Q-channel signals. These pre-computed correlation functions are then used to quickly determine phase difference and delay without requiring complex real-time processing, thereby reducing processing time while maintaining measurement precision.
Solution Approach 2:
The patent replaces complex mechanical signal processing with mathematical correlation operations. Instead of using physical compensation circuits that would require complex adjustments and measurements, the system uses cross-correlation and autocorrelation mathematical operations to extract phase and delay information, significantly reducing processing time while improving measurement precision.
Data Source
AI summary
The embodiments of the present disclosure disclose a method and apparatus for detecting a phase difference and delay of a coherent receiver as well as a storage medium. The method comprises: acquiring a first set of signals and a second set of signals output by the coherent receiver; processing the first set of signals to obtain a first phase difference corresponding to the first set of signals; processing the second set of signals to obtain a second phase difference corresponding to the second set of signals; obtaining a phase difference and delay of the coherent receiver based on the first phase difference and the second phase difference. By using the above methods, the phase difference and delay detection accuracy of coherent receivers can be improved.