【摘要】 进行了浅海声信道中低频脉冲压缩和信道匹配的理论和实验研究。实验中通过脉冲压缩,实现了超过110 km的高信噪比信号接收,信噪比时间增益与理论分析结果一致;信道实测时间相关半径超过了500 s;信道匹配处理提高了实验脉冲信号检测信噪比(信道匹配增益),基本消除了多途对脉冲信号检测信噪比的影响,且信道匹配增益可以进行理论预报。实验表明,脉冲压缩可有效增加浅海低频声脉冲的传输距离,信道匹配可用于消除多途对脉冲信号检测信噪比的影响。更多还原

【Abstract】 Theoretical and experimental research of low frequency pulse compression and channel match in shallow water sound channel were carried out based on 2000-Winter Yellow sea experiment. Using pulse compression method, signals with high signal to noise ratio (SNR) were received over range of 110 kilometers in the experiment. The SNR gain in the process is consistent with the theoretical prediction. The experimental measurement indicated that the channel is highly coherent over a time of 500 s. Channel match method was used to compensate the degradation of pulse compression SNR caused by the multipath propagation. And the SNR gain in the channel match process can be theoretically predicted. Experimental results show that low frequency pulse compression and channel match method can be used in shallow water sound channel to improve the SNR.更多还原