| 摘要 |
PURPOSE: A wireless modem for providing a USN(Ubiquitous Sensor Network) based real-time monitoring system is provided to improve data transmission speed and a transmission and reception distance by utilizing strengths and weaknesses in each frequency bands. CONSTITUTION: A USN based wireless modem of a TFB(Triple Frequency Band) is mounted in an integrated gateway(200). A frequency band of the wireless modem belongs to RF(Radio Frequency) zigbee 2.4GHz, 10mW, RF 424MHz, or WCDMA(Wide Code Division Multiple Access) 2.1GHz. A communication distance is 1.5Km in the RF 424MHz. The wireless modem communicates between the two walls. The wireless modem is minimized to a single board with a low voltage. [Reference numerals] (100,J1,J2,J3,K1,K2,K4,K5) Water quality sensor; (200,K3) Gateway; (A1) Emergency site dispatch; (A2,E2) SMS of a member in charge; (BB) Alarm, SMS service, and emergency dispatch if collected data exceeds a limit; (CC,FF) SMS collected data transmission; (DD) Real-time water quality monitor; (E1) Resident; (GG) Obstacle occurrence; (HH,II) Water quality data transmission through COMA; (J4) Wireless network: RF ZigBee 2,4GHz; (J5) Output: 10mW; (J6) Multicarrier: forming 200 Node; (L1) Water quality data transmission flow; (L2) SMS service flow; (L3) Flow if water quality data obstacle occurs
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