FIELD: physics, navigation.
SUBSTANCE: invention relates to avionics and devices for signalling proximity with the ground or high obstacles. The technical result is achieved due to that the obstacle sensor comprises a radio transmitter with a directional antenna which periodically emits radiation pulses based on a command from a multivibrator, a radio receiver, an electronic switch controlled by a timing relay, a second timing relay, an amplifier, a light and/or audio indicator; the sensor may include two or more such independent sensors; antenna sectors of which partially overlap in space; the sensor may include a multi-position "running lights" type circuit which cyclically connects the directional antenna to the corresponding LED.
EFFECT: reducing the dimensions of the antenna by selecting a high operating frequency and reducing transmitter power and receiver sensitivity.
7 cl, 5 dwg
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