The Design Of Base Station In Long-baseline Positioning System

As the typical representative of underwater shooting range equipment,long-baseline positioning system plays essential part in trials of underwater weapons and the building up of national defense.Long-baseline positioning system mainly consists of shipborne base station subsystem,shipborne HCI subsystem,buoy array subsystem and wireless radio network subsystem,etc.Up to now,long-baseline positioning systems have been upgraded for many times,which are widely applied to defense programs.As an essential part of long-baseline positioning system,shipborne base station subsystem realizes lots of important functions.After summarizing and analyzing the development of base stations in long-baseline positioning systems,this paper designs and implements a new base station which is innovative,practical and suitable for almost all kinds of long-baseline positioning systems.The long-baseline positioning system uses the buoys equipped with GPS to make an underwater positioning framework.Different systems solve the targets' positions by different measurements.It is demanded that the measured data of each buoy be transmitted to the master computer for integrating and computing.The wireless radio communication makes it realizable that the shipborne base station do the remote control to the buoys,the buoy data be transmitted back,and the large-scale acoustic orientation be achieved.At the same time,the shipborne base station also needs to provide the coordinates of communication-ship to achieve self-positioning.Combined with GPS information,the base station need to output synchronization cycle seconds pulse in synchronization mode.Under certain circumstances,base station need to decrypt encrypted data,etc.The main work of this paper is the design and implementation of hardware and software of long-baseline buoy positioning system base station platform.Mainly include:1?Select Zynq as the core of the MicroZed development board,using FPGA to achieve synchronous output and data decryption,using ARM to achieve the transplantation of Linux system and application function.2?Design location module to acquire GPS information,debug related interfaces,and realize self-positioning and synchronization of the system.3?Select radio station and other hardware modules,design the interface board,complete the corresponding design,realize the corresponding function.After the completion of work above,ultimately the complete equipment is formed.The new equipment has advantages like portable,easier operation,higher precision and larger range,which is applied to multiple sets of long-baseline positioning system.After many lake and sea test certificates,it fully meets the requirements of the index,and also provides a reference for the overall improvement of the long-baseline positioning system.