| 摘要 |
Apparatus for use with a position-finding system that operates according to the reflected beam principle. This position-finding system, e.g., a radar system, has a revolving beam-receiving antenna as well as a cathode-ray display tube with a deflection system arranged to rotate in synchronism with the antenna. The apparatus according to the present invention is intended to provide a display of one or more radially extending traces on the screen of the cathode-ray tube at selectable angular positions thereof to provide reference bearing information to the operator of the system. The apparatus includes a memory device, connected to rotate in synchronism with the antenna, for storing signals at preselected angular positions on its surface. The apparatus further includes means to write signals into or erase signals from the memory device and means to repeatedly read out these signals from the memory device during each revolution thereof to display a bearing trace on the cathode-ray tube screen in response to each signal when read.
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