The Design Of Time Daleay Measurement System Based On Self-synchronizing

With the unceasing development of science and technology, accurate localization of the aircraft drop-point has become more and more significant.Passive time delay localization technology has been widely used for its advantages like long range of operating distance,high accuracy of localization precision and strong anti-jamming ability.The overall performance of the localization system has been directly influenced by time delay measurement algorithm because the precision of time delay measurement which can be regard as an important part of the passive time delay localization system was affected by time delay measurement algorithm. To solve this problem,a time delay measurement system based on self-synchronizing has been proposed,which avoid to use high accuracy clock between base stations and the signal transmit channels are not needed to establish specialized.By analyzing the correlation time delay algorithm and LMS time delay algorithm,it can be seen that the correlation algorithm cannot get the time delay accurately under low noise condition,while LMS algorithm has a good result. Considering all these above,LMS time delay algorithm has been chose.In accordance with overall structure of the system, FPGA core-board and its peripheral circuit,serial port and other modular circuit has been designed after component selection of time delay measurement system in terms of hardware.Local pseudo code generator,LMS time delay measurement algorithm,the function of FIFO,serial port and other models has been designed using QuartusII in terms of software.Simulation is proceeded to verify the correctness of this design.