FIELD: safety.
SUBSTANCE: invention relates to equipment for preventing unauthorised access to vehicles and can be used in motor transport to prevent theft or break-in. System for protection from extension of signal of standard key includes interaction of standard key and a protected object - vehicle. Standard key has a receiver for receiving a low-frequency (LF) authorisation request signal from a transmitting module of automobile part of comfortable access system, and also has a transmitter for response transmission of a high-frequency (HF) signal with authorisation data to receiving module of automobile part of comfortable access system. Protection system additionally comprises a broadband high-frequency receiver which does not interact with standard key, a decision device, input of which is connected to output of high-frequency broadband receiver, and a transmitter of interference signal, input of which is connected to output of decision device.
EFFECT: reliable protection against signal extension of standard key.
1 cl, 1 dwg
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