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    • 4. 发明授权
    • Method of formation of channels for a sonar, in particular for a
towed-array sonar
    • 形成声纳通道的方法,特别是用于牵引阵列声纳
    • US5058081A
    • 1991-10-15
    • US582330
    • 1990-09-14
    • Christian GulliJean Le GallGeorges Grall
    • Christian GulliJean Le GallGeorges Grall
    • G01S7/534G01V1/22G10K11/34
    • G01V1/22G01S7/534G10K11/346
    • In a method of formation of channels for a sonar, after having sampled at a frequency T=1/4f.sub.0 (where f.sub.0 is the receiving center frequency of the sonar) the signals from the hydrophones of the sonar and having translated them to baseband, the signals thus translated are subsampled with a period T.sub.SE =kT (wherein k is an integer) substantially equal to 1.25 B, where B is the reception bandwidth of the sonar. A first set of signals is subsampled at identical times to form a frontal sector. Two further sets of signals are subsampled with delays between the signals from two adjacent hydrophones equal to T, which determines two side sectors adjacent to the frontal sector. The subsampled signals are then transmitted serially by the towing cable of the sonar device towed array and are processed in FFT circuits which allow to form in each sector a set of channels covering the sector. This allows to considerably reduce the data transmission rate between the towed portion of the sonar and the portion located in the towing ship.
    • 在形成用于声纳的声道的方法中,在以声纳的水听器的频率T = 1 / 4f0(其中f0是声纳的接收中心频率)的频率进行采样并将其转换为基带之后, 如此翻转的信号以基本上等于1.25B的周期TSE = kT(其中k是整数)进行子采样,其中B是声纳的接收带宽。 第一组信号在相同的时间被二次采样以形成正面扇区。 两个另外的信号组被二次采样,两个相邻水听器的信号之间的延迟等于T,其确定与前部扇区相邻的两个侧扇区。 子采样信号然后通过声纳设备牵引阵列的牵引电缆串行发送,并且在FFT电路中进行处理,其允许在每个扇区中形成覆盖扇区的一组信道。 这允许显着地减少曳引的拖曳部分与拖曳船之间的数据传输速率。