| 摘要 |
A search and locate system includes a search station having an active, low light level electro-optic unit. A search beacon of nonvisible laser radiation is transmitted from the search station. A person to be located has a locator unit including a corner-cube retro-reflector which reflects a portion of the radiation of the search beacon back to the search station where it is detected by the low light level receiving apparatus. The locator unit also includes a photo-detector and indicator which provides a signal when the locator unit is positioned within the radiation from the search beacon. This enables the person utilizing the locator unit to sustain the reflection back to the search station, thus enhancing the likelihood of detection. The locator unit further includes a low power modulation system whereby the person can transmit a message to the search station via the reflected beam. Means are additionally provided for coding the radiation from the search beacon and for detecting a predetermined code at the locator unit. This enables the person using the locator unit to reflectively respond only to a search beacon transmitting radiation with the correct code.
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