Title: Microwave module of roadside unit in electronic non-parking charging short-range communication system
Application Number: 200520045421 Application Date: 2005.09.29
Publication Number: 000000000 Publication Date:
Approval Pub. Date: 2006.10.25 Granted Pub. Date: 2006.10.25
International Classifi-cation: G07B15/00
Applicant(s) Name: No.50 Inst, China Electronic Tech Co Address:
Inventor(s) Name: Ma Yunlei
Attorney & Agent: zuo yibeng
Abstract:
    The utility model discloses a microwave module of roadside unit (RSU) used in the short-range communication system (DSRC) of the electronic non-parking charging system (ETC). It contains a local oscillation unit that generates local oscillation signal with PLL mode and transmits the same local oscillation signal through two channels to a sending unit and a receiving unit; a sending unit that uses the local oscillation signal to ASK modulate the sent data, to amplify the ASK modulating signal and to send them out; and a receiving unit that can receive the microwave signal from the DSRC communication frequency and make down-conversion of the received microwave signal with the local oscillation signal to obtain I channel data-signal and Q channel data-signal. The microwave module of roadside unit in electronic non-parking charging short-range communication system of the utility model uses zero intermediate frequency receiver scheme to eliminate the same frequency interference from the sending unit to the receiving unit, so the number of the local oscillation source is decreased, and the complexity and the cost of the module are also decreased.
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