New channel access protocol for a wide area DGPS deformation monitoring network

A new kind of one-point-to-multipoint random access channel protocol called the acknowledgement-type random access and code division multiple access channel protocol (ACK-ALOHA-CDMA) is presented. It is particularly applicable to the data transmission of differential Global Positioning System (DGPS) deformation or disaster monitoring networks with a large number of monitoring stations distributed over a wide area. The characteristics of the channel are analysed in detail and computer simulation results are given. Several mathematical functions and conclusions useful for both system design and performance evaluation are obtained