公开(公告)号：US4117482A

公开(公告)日：1978-09-26

申请号：US813481

申请日：1977-07-07

申请人： Joseph Jepsky ,  Irvin S. Englander ,  James E. Williams

发明人： Joseph Jepsky ,  Irvin S. Englander ,  James E. Williams

IPC分类号： G01S5/12 ,  G01S13/42 ,  G01S9/04

CPC分类号： G01S5/12 ,  G01S13/42

摘要： An electromagnetic energy pulse-echo system combined with a data processing unit and a memory storing the locations of a number of fixed echo reflectors relative to a waterway so that the pulse-echo system operating from a boat can register the echo reflectors and positions in the waterway can be calculated by the data processing unit.