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一个为海洋地层探测而设计的互补码信号发生和处理系统已经研制成功。其实施方案是:声源交替地发射一对互补码信号中的两个互补部份,接收机相应地进行回波信号的实时相关处理,然后再在时间上一一对应地把相继两次的相关处理输出实时相加,就得到无旁瓣的终端输出在地层探测图上显示。波浪起伏会对回波到达时间和信号码元间隔进行调制,由此产生的“去互补”和“去相关”效应会降低互补码信号处理的性能。本文着重研究了这个问题,并通过计算机模拟预测了在实际的海洋地层探测中应用互补码脉冲压缩技术的有效性。
A complementary code signal generation and processing system designed for the exploration of the ocean floor has been developed. The implementation is such that the sound source alternately emits two complementary parts of a pair of complementary code signals, and the receiver performs real-time correlation processing of the echo signals accordingly, and then sequentially corrects the signals one after another in time The output of the correlation processing is added in real time, and the output of the terminal without side lobe is displayed on the formation exploration map. Wave fluctuations modulate the echo arrival time and signal symbol spacing, resulting in “de-complementary” and “decorrelation” effects that degrade the performance of the complementary code signal processing. This paper focuses on this issue and predicts the effectiveness of using complementary code pulse compression techniques in actual oceanographic exploration by computer simulations.