Hardware Design Of Mobile Ad Hoc Communica-Tion System And Research Of TDOA Algorithms

This paper addresses the demand of "keeping in touch with the outside world at anytime and anywhere".It makes use of self-organize-network technology,and designs to develop a mobile Ad hoc handheld terminal system with strong operating capacity and multiple user functions.The facilities of the entire system are simple and easy to carry.The utility of the terminals can be used in all kinds of the environments,not limited to location and free networking anywhere and anytime,and users can switch the software to adjust the system networking mode and its related parameters.The hardware device of the commu-nication system includes a handheld terminal body,a radio frequency antenna module,a headset microphone combo microphone and a head-mounted camera peripheral configu-ration equipment.The main work of the dissertation is as follows:(1)Grasp the use of scenarios and analyze system functional requirements combined with user habits to achieve the mobile Ad Hoc handheld terminal hardware design,in-cluding requirements analysis,selection of chip,design of functional module,drawing of component packaging circuit,overall layout design of the terminal and and system board work.Finally the system hardware terminal will be developed.(2)The in-depth research on high-precision wireless location algorithms based on TDOA(time difference of arrival)will be done,highlighting three kinds of TDOA posi-tioning algorithm-LS algorithm,Taylor series algorithm and Chan algorithm,and the chosen TDOA algorithm is chosen and is improve better with Kalman filtering for the non line of signt.On the basis of realizing the global satellite positioning function,the function system of positioning module of the handheld terminal is perfected,so that the nodes accessing to the same Ad Hoc network can locate each other with high precision.The positioning accuracy of the module strives to be strictly controlled below the order of meters.(3)Focus on TDMA network mode and optimize self-developed TDMA-based net-work self-organizing program through the use of 1PPS of satellite receiver module.