FPGA-based DAS signal adaptive demodulation method and system

By implementing an adaptive demodulation method on the FPGA platform, the amplitude energy and variance characteristics of the DAS signal are monitored in real time, and an adaptive gain factor is generated for compensation and iterative demodulation. This solves the problem of unstable demodulation capability of the DAS system in complex environments and improves the reliability and demodulation accuracy of the system.

CN122120092APending Publication Date: 2026-05-29BEIJING ZHONGTUO XINYUAN TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING ZHONGTUO XINYUAN TECH CO LTD
Filing Date
2026-02-06
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

The signal-to-noise ratio of existing DAS systems is affected in complex environments, leading to unstable demodulation capabilities and impacting system reliability.

Method used

An adaptive demodulation method is implemented on the FPGA platform. By monitoring the instantaneous amplitude energy and variance characteristic value of the DAS signal in real time, a gain factor is dynamically generated for adaptive gain compensation and iterative demodulation. The lookup table is then used for self-calibration in conjunction with the modulus deviation feedback.

Benefits of technology

This improves the demodulation robustness and reliability of the DAS system under low signal-to-noise ratio conditions, and enhances the system's robustness and demodulation accuracy in complex environments.

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Abstract

A kind of DAS signal adaptive demodulation method and system based on FPGA, wherein, the method comprises: obtaining the in-phase component signal and quadrature component signal of DAS signal;When the address of write pointer occurs incremental change, the historical in-phase component signal and historical quadrature component signal in the preset history sampling window are read;The instantaneous amplitude energy of each time stamp is calculated, and the instantaneous amplitude energy sequence is obtained;The amplitude energy mean and variance eigenvalue of DAS signal are calculated;Adaptive gain factor is generated;The in-phase component signal and quadrature component signal are compensated and iteratively demodulated by adaptive gain, and the phase output value and demodulation module length value are obtained;The module length deviation amount of demodulation module length value and preset standard module length is calculated, and when the cumulative value is greater than preset locking threshold, the correction coefficient is calculated according to the current amplitude energy mean and module length deviation amount;The storage value of index address is updated based on correction coefficient.The application can improve the reliability of DAS system.
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