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Monitoring snow distribution area plays an important role in researching climate change and energy exchange process. Chinese small satellite constellation (abbreviated HJ constellation) is special for environment and disaster continuously monitoring or forecasting. By using HJ-1B CCD and infrared data or only using its infrared data, it can construct NDSI (Normalized Difference Snow Index) or MNDSI...
Liquid level control system which is made up of PLC as controller, frequency transformer as executable device is designed. Its PID control parameters are set on-line using the Relay feedback Auto-tuning algorithm and self-tuning function of Siemens S7-200 PLC. The MCGS monitoring software is used at control system operator station which can achieve the functions such as real-time data acquisition,...
Real-time video monitoring is necessary for remote control mining while real-time positioning of underground equipments is also necessary for unmanned mining. In this paper, a new pattern combining WLAN with ZigBee is proposed to solute the two problems above. In the pattern, RSSI(Received Signal Strength Indication) values of ZigBee anchor nodes are used to calculate the position and posture of underground...
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