发明名称 |
Method of locating a submarine cable and power feed circuit for this cable |
摘要 |
<p>A method of locating a submarine cable (6) includes the steps of transmitting a toning signal along the submarine cable (6), the toning signal being a superposition of a first signal waveform to be detected and at least a second signal waveform such that the second signal waveform interferes with the first signal waveform to limit the peak to peak amplitude of the toning signal for transmission. Preferably, the toning signal is a square wave. The method provides a way of offsetting the loss of transmission distance due to the use of state of the art optical repeaters (7). Pre-emphasis of high frequency harmonics in the toning signal enables a detectable toning signal to propagate still further. <IMAGE></p> |
申请公布号 |
EP0952464(A2) |
申请公布日期 |
1999.10.27 |
申请号 |
EP19990301844 |
申请日期 |
1999.03.11 |
申请人 |
ALCATEL |
发明人 |
LANCASTER, PHILIP CHARLES;WEBB, STEPHEN MICHAEL |
分类号 |
G01V3/06;G01M11/00;H01B7/32;H04B10/16;H04B10/17;(IPC1-7):G01V3/06 |
主分类号 |
G01V3/06 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|