| 摘要 |
A ramark (radar marker) beacon for aiding navigation on a radar screen has been improved by synchronizing a ramark beacon code with a radar pulse. A beacon code having long dots and short dots stops on a radar screen so that the code may be identified by a radar operator. The present ramark beacon has a code pulse generator for amplitude-modulating a transmitter of a beacon, and said code pulse generator is initialized by each received radar pulse, so that a code pulse is synchronized with a radar pulse. The code pulse generated by said code pulse generator has the same period as the period of the received radar pulse.
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