FIELD: transport engineering. SUBSTANCE: invention relates to means for preventing hi-jacking and thefts. Proposed system contains set of transponders and stationary part installed on vehicle to protected and including logic module, User warning unit, immobilizer relay member, transponder reader, individual service settings storage unit and settings state signal converter. Transponder reader contains master oscillator, modulating code oscillator, phase keyer, power amplifier, duplexer, transmit-receive antenna, high-frequency amplifier, two multipliers, narrow-band filter, low-frequency filter, storage unit and comparator unit. Acoustic surface wave transponder is built around multitapped delay lines being essentially piezocrystal with aluminum thin-walled piezocrystal transducer applied to its surface and set of reflectors, part of taps being played by acoustic surface waves interdigital transducers. Said piezoelectric transducer is connected to microstrip antenna made on surface of piezocrystal. EFFECT: improved reliability of protection. 5 dwg
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