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本文通过建立声相关计程仪（Ａｃｏｕｓｔｉｃ Ｃｏｒｒｅｌａｔｉｏｎ Ｌｏｇ）的海底混响回波模型，将脉冲信号 调制在伪随机序列中作为发射信号，对在低航速下的声相关测速性能进行了计算机仿真研究．仿真 结果表明：在低航速下，伪随机序列能使脉冲信号的测速性能得到明显的改善；调相伪随机序列在航 速检测的正确率和精度上优于调幅伪随机序列；调幅伪随机序列在抗噪声上有其独特的效果．
In this paper, we establish a seabed reverberation echo model of Acoustic Correlation Log, and modulate the impulsive signal into a pseudo-random sequence as a transmit signal to simulate the sound-related velocimetry at low speed. The simulation results show that the pseudo-random sequence can significantly improve the speed performance of pulsed signals at low speed and the pseudo-random sequence with phase modulation is superior to the amplitude modulation pseudo-random sequence in accuracy and accuracy of speed detection. Anti-noise has its unique effect.