METHOD OF INSPECTION OF TRANSPORT FREIGHT Russian patent published in 2006 - IPC G08G1/123 G07C5/08 G08B25/10 

FIELD: transportation vehicle control and inspection.

SUBSTANCE: two-way radio communication is established between transportation vehicle (TV) and information-analytical center (IAC). To establish the communication, high frequency oscillation at carrier ω_s is formed at TV. The oscillation is phase-manipulated correspondingly to modulation code M₁(t) which has information on code of TV and its current coordinates, unauthorized access to container and container code. Phase-manipulated complex signal after being formed is subject to frequency conversion by using first heterodyne frequency wh₁. Voltage of first intermediate frequency w_int1 is selected which equals to sum of frequencies w_int1=w_c+w_h1=w₁. The voltage is subject to frequency amplification and it is irradiated into air. Signal is received at IAC and power-amplified. Then it is subject to power amplification by using first heterodyne frequency w_int1 and voltage of second intermediate frequency w_int2 which is equal to frequency difference w_int2=w_int1-w_h1. Selected voltage is multiplied by voltage of second heterodyne and complex signal with phase manipulation is selected at frequency w_h1 and is subject to synchronous detection by using voltage of first heterodyne as reference voltage. After it low frequency voltage is selected which is proportional to modulating code M₁(t). In case TV deviates from its route, high frequency voltage is formed at IAC at frequency of w_c and it is subject to phase manipulation corresponding to modulating code M₂(t) which contains info on signal. Phase manipulated complex signal is frequency conversed by using second heterodyne frequency w_int2, voltage of intermediate frequency w_int2 is selected which equals to w_int2=w_h2-w₂. Then signal is power amplified and sent to air. Selected voltage is multiplied by voltage of first heterodyne, complex signal with phase modulation is selected at frequency w_h2 of second heterodyne and the signal is subject to sync detection by using voltage of second heterodyne as reference voltage. After that low frequency voltage is selected being proportional to modulating code m₂(t). Frequencies w_h1 and w_h2 of heterodynes are put apart for value of second intermediate frequency w_h2-w_h1=w_int2. Complex signals with phase manipulation at TV are irradiated at frequency of w₁ and received at frequency w₂. At IAC the signal is irradiated at frequency w₂ and received at frequency w₁.

EFFECT: improved reliability of protection of freight from driving away and burglary.

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