A new model of free global positioning system using triple DME

This paper introduces a new scheme of global positioning system (GPS) without using of satellites or GPS- Free positioning. It is based on using triple distance measurement equipment (DME) which can be implemented with a map includes; determined longitude and latitude on the user`s receiver. First, advantages, previous studies and activities which are related to this subject is described as well as the DME properties are presented. Then, a practical model of triple DME and implementation of mathematical model on the map for finding the positions are discussed. Finally, the results of simulations are shown as well as the future of GPS- Free project and its prospective is stated.