The article analyses the seawater transport model of the modulated-pulse LIDAR signal, and the frequency characteristic of the seawater backscattering signal and target reflectingsignal are studied.
文章分析了调制脉冲激光雷达探测信号水下传输模型，研究了海水后向散射信号以及目标反射信号的频域特性。
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The method of the two-channel optical fiber reflecting for particle velocity measurement was adopted to get the time sequence signal of moving particle velocity in the fluidized bed.
The signal of instant vibration testing for soil compactness is analyzed both in time domain and frequency domain. Some feature parameters reflecting the characteristics of the signal are extracted.