| 摘要 |
The invention relates to radio engineering and can be used at organization of identification of several objects simultaneously. A method for increase of range of coverage of the multiuser radio-frequency identification system is in reception of radio-frequency oscillations from reading device with passing first through controlled phase changer of through type. After that radio-frequency signal is amplified with performing its additional amplitude modulation with unique code sequence. Amplified and modulated radio-frequency signal is passed again through controlled phase changer of through type, to its control input low-frequency control signal is applied, with further emitting. Radio-frequency oscillations transformed by frequency and modulated by amplitude are repetitively received with mixing with initial radio-frequency oscillations, due to that at output of mixer one obtains simultaneously several signals from transponders. Those combinatory low-frequency differences of initial and transformed by frequency radio-frequency components are separated. Low frequency signals separated in each channel are equal to frequencies of shift induced with each of transponders, those are in zone of effect of the system of radio-frequency identification. Each of signals is de-modulated with obtaining at output several unique code sequences simultaneously, with that one performs identification of several objects simultaneously. Technical result of the invention is in increase of range of effect of the system of radio-frequency identification. |
