The Design Of Timing Positioning Navigation System Based On Beidou

With the rapid development of social information technology,satellite navigation system has become one of the most cutting-edge and high-tech application development fields in the world.It has been widely used in military,civil and scientific research and other fields.Our country attaches great importance to the research and construction of satellite navigation.Since 2000,researchers began to gradually create our own global satellite navigation system-the Beidou satellite navigation system of China,which is independently developed,and we have carried out in-depth research on its satellite navigation technology.At present,Beidou Positioning System has been successfully applied in many fields,such as engineering surveying and mapping,transportation,public security and so on,which has created great value in terms of social security and economic benefits.At this stage,with the further development of Beidou satellite navigation technology,how to improve the timing and positioning accuracy of Beidou system has become a research hotspot.This paper designs a portable Beidou timing and positioning system with low power consumption,convenient operation and high precision.The main function of the system is to receive the information of Beidou module and sensor module,and process the measured the data through MCU.Finally,the timing positioning data information which is easy to read is displayed on the human-computer interface.On this basis of the system,combined with the characteristics of Beidou timing and positioning,particle swarm optimization is introduced into the system to optimize the data information collected by Beidou,so as to improve the timing and positioning measurement accuracy of the system.In the aspect of hardware design,it mainly consists of Beidou module,STM32 core board module,sensor module,power supply and display module.The system uses STM32F103 as the main control MCU,Beidou module adopts UM220-? N module to collect Beidou data information,and the sensor module adopts the built-in air pressure sensor and temperature sensor of iNEMOTM series inertial sensor to provide environment variable data for the system.MCU accesses the data of 1ps001d1 air pressure sensor through IC interface,so as to obtain the data of air pressure,temperature and compensation parameters measured by the sensor.The display module of the system is connected with the main control core by the way of SPI backplane routing,and the real-time display of the measurement data is realized by establishing the font library.In the aspect of software design,in order to improve the timing and positioning speed of Beidou signal receiver,BDS/GPS dual-mode timing and positioning signal tracking module is configured to analyze the received timing and positioning data and extract the required longitude and latitude information.After that,the satellite data is settled to get relatively accurate time and date data,so as to realize the time service function.Based on the negative correlation between atmospheric pressure and altitude,the system uses linear fitting method to convert atmospheric pressure data into physical altitude data.On the basis of two-dimensional positioning of longitude and latitude,the altitude data is added to realize three-dimensional positioning of Beidou system.Finally,the hardware and software system designed in this paper realizes the functions of Beidou timing and positioning information collection,processing,storage and display.At the same time,the particle swarm optimization algorithm is applied to the data processing part of the system to obtain more accurate timing and positioning information.Then,the simulation results are compared with the reference timing positioning information.The experimental results show that the PSO can correct the timing and positioning errors of the system,and the improved Beidou timing and positioning system is more accurate.