Study of SMS query algorithm of GSM in farmland microclimate collection system
Yang Duan-li · Hebei Nongye Daxue xuebao · 2008
In the study of farmland microclimate collection system,the wireless transmission function has been build based on Global System for Mobile communication(GSM) model controlled by AT89C52,and the users can query the Microclimate information anytime by using the short message function of mobile telephone.The algorithms and program developed deal with the circumstance of no message,message being read,new message,multi-users query,and simultaneous two-user query.The papaer,then,proposes the dynamic code scheme to increase the acuity of identification of users' legality.