| 摘要 |
FIELD: transport; devices to prevent unauthorized use or stealing of cars. SUBSTANCE: antitheft device has the following elements mounted on car: storage battery 1, ignition switch 3, two-position switch 3, inductance coil 4 with magnetic core, primary winding 5 of ignition coil, transmitter 6 and antenna 7. At check station the following elements are installed: receiving antennas 8,9.1-9. n; search unit 10; first local oscillator 11; reference voltage generator 12; pulse generator 13; electronic switch 14; first and second mixers 15 and 16, respectively; first and second first intermediate frequency amplifiers 17 and 18, respectively; frequency doubler 19; first and second spectrum width meters 20 and 21, respectively; comparison unit 22; threshold unit 23; first delay line 24; first switch 25; first autocorrelator 26; second delay line 27; first phase detector 28; first recorder unit 29; second switch 30; frequency meter 31; second recorder unit 32; second local oscillator 33, third mixer 34; second intermediate frequency amplifier 35; multiplier 36; narrow band filter 37; second autocorrelator 38; third delay line 39; second and third phase detectors 40 and 41, respectively, and third recorder unit 41. EFFECT: enlarged operating capabilities owing to transmission of alarm information radio to check station where bearing and certificate data of car are determined; increased secrecy. |
