Wireless Position Scheme based on ZigBee Network in the Freeway ETC System

Abstract

<p class="Abstract">Based on the review of the development situation of the ETC home and abroad and the ETC key technology, this paper put forward to apply ZigBee network in the freeway ETC system. CC2431 wireless location function is used in the high speed highway ETC system to realize data transmission between network centre node and terminal node safely, which records passing information of the vehicle terminal by the wireless data transmission between the coordinator and vehicle terminal. To improve the position accuracy, a weighted centroid position algorithm is introduced combination the RSSI with centroid position algorithm. The test results of the wireless communication between vehicle terminal and coordinator show that CC2431 wireless position system can realize vehicle omnibearing position and real time monitor in the super-speed highway.</p

Construction Site Environment Temperature Monitoring System Based on ZigBee and Virtual Instrument

“…The unique potentials of these technologies also provide large development space for the automatic monitoring on construction site. Barcode technology [4] can be used for asset management based on label reading recognition; RFID technology, based on electronic signal detection, can make up the contact limitation of barcode technology and can be used for personnel identification, authorized access and resources tracking for its small size and noncontact recognition [5][6][7]; GPS technology can be used for positioning of outdoor resources on construction site; Ultrasonic and infrared technologies can be used for indoor positioning and monitoring that GPS does not achieve, but they are also affected by line of sight limitation; Bluetooth [8], Wi-Fi [9], Ultra-Wideband [10,11] and ZigBee wireless network technologies [12][13][14] can be used for wireless transmission of information on construction site; video camera [15], laser scanning [16] and other monitoring technologies also can be used for automatic monitoring on construction site with their own characteristics.…”