Is currently doing a smart yard project, is probably the warehouse management system, we are precise positioning GPS navigation and radio frequency card, the idea of our project is a shelf to put a radio frequency card, car with a reader, assuming that we need to take the goods are in no. 1, 3, 5, shelves, the process is, we need to find in their own system specified in the first 1,3,5 shelves, then remote set 1,3,5 shelves need to respond to the reader, after the car began to search based on navigation shelves, after 1,3,5 shelves reader will have a response. The principle is the information above, the current problems of two questions: (1), to do the first time, we should choose what kind of radio frequency card (2) is how to use the radio frequency card, because the rf card reader connected with our system (because decide which shelves were induced, the demand is determined by the system, so the reader will related to our system), the reader so a physical device to relevant to our system, do not know how to deal with the correlation between the two, so want to ask have done projects in the people give a little advice and inspiration, thank you