Simulation Study on Pulse Compression by Bi-phase Coded Excitation with Carrier Modulation
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摘要: 本文为将编码技术引入地震探测中,在分析编码激励基本原理的基础上,开展了编码激励的数值模拟研究,掌握编码激励的规律和特点。通过激励编码信号的调制发射,对接收信号进行脉冲压缩的仿真研究。其次通过单位码元载有1至5个载频周期个数的13位Barker码调制信号激励换能器(通过发射载有1至5个载频周期的13位Barker码调制信号来激励换能器),对接收信号进行脉冲压缩仿真研究和频谱分析,分析了换能器性能对编码激励信号及其脉冲压缩结果的影响。Abstract: In order to introduce the digital encoded technology to the seismic detection,the author studied coded excitation digital simulation and grasped the rules and characters of coded excitation,which is based on the basic coded excitation principle.By modulation launching of coded excitation signal,the author also did simulation research on pulse compression of received signal.Furthermore,the author processed pulse compression with 13 bit signal excitation transducer with one to five units code element(by launching of 13 bit signal excitation transducer with one to five units code element).The author did the power spectrum analyses and analyzed the influence on different excitation signal and its pulse compression result by transducer.
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Keywords:
- seismic detection /
- carrier modulation /
- Barker codes /
- pulse compression
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