| 摘要 |
PURPOSE:To make it possible to detect and active target with high accuracy by enlarging the detectable range of the active target, by detecting that the target is present on a curve having two stations as focal points. CONSTITUTION:By the radio wave emitting time from a radar main station 1 and the receiving time of the radio wave reflected from a target 2, it is detected that the target is present on an oval curve having stations 1, 1a as focal points. Therefore, the detectable range of the active target of the main station 1 can be enlarged by together using the passive receiving station 1a and, when one or two of an auxiliary receiving station is used in the receiving station 1a corresponding to the presence and absence of arrival direction detecting function, target detection can be performed with high accuracy. Furthermore, the detection of an underwater target can be similarily performed by using a sonic wave. |
