研究目的
Research on the realization of time reversal mirror (TRM) based on analog signal processing technology, specifically achieving time-reversed electromagnetic waves using Fourier transform theory and chirped dispersive delay lines.
研究成果
The proposed system successfully achieves time reversal of a 1 ns microwave signal using CDDLs based on Fourier transform theory. It offers higher stability and time-bandwidth products compared to conventional methods, making it suitable for applications requiring high precision and efficiency in time inversion systems. Future work should explore optimization and broader applications.
研究不足
The system relies on specific CDDL designs and may be affected by non-ideal linear modulation of sweep signals due to AWG sampling rate limitations. Further investigation is needed on the effects of dispersive delay lines and chirp shaping on reversed signals.
1：Experimental Design and Method Selection:
The experiment is designed to validate the theoretical proposal for time reversal using cascaded Fourier and inverse Fourier transforms via chirped dispersive delay lines (CDDLs). The method involves analog signal processing to avoid digital limitations.
2：Sample Selection and Data Sources:
A triangular wave signal with a time length of 1 ns is used as the input signal. Data is generated and processed using computer simulations and experimental setups.
3：List of Experimental Equipment and Materials:
Key equipment includes an arbitrary waveform generator (AWG7122B), two designed CDDLs with specific slopes, a LeCroy 830Zi-A Serial Data Analyzer (SDA), and a computer for signal generation and mixing.
4：Experimental Procedures and Operational Workflow:
Steps involve generating input signals, mixing with sweep signals, passing through CDDLs, and capturing outputs with the SDA. Digital mixing is performed in the computer, and signals are sent via the AWG.
5：Data Analysis Methods:
Output signals are compared with simulated results to verify time reversal. Analysis includes checking waveform inversion and system stability.
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