浅海随机时变声信道的时间平稳性

On the Time Stationariness to a Random Time-Variant Acoustic Channel in Shallow Sea

用统计方法的非参数法—输次检验。检验信号通过随机时变声信道的时间平稳性问题。对多次海上实验样本进行检验,结果表明:随机时变声信道的响应在海况1～3级、距离600～1 000 m,其平稳时间大于 2 min。

The time stationariness of a random time-variant acoustic channel in shallow sea is investigated by means of the runs-test method, a nonparametric statistical one. The independence of interval samples, the stationariness of sample mean value and correlation function are tested respectively through five acoustic signal transmission experiments at Xiamen Port. It is showed that the time scaIe of stationariness fof the channel reponce is more than 2 minutes while with the range about 600- 1 000 metres at sea state level about 1-3