Research On The Technology Of Micro PNT Information Processing Unit

Positioning,Navigation and Timing(PNT)technology provides the most basic information of location and time in society.At present,it is widely used in uav,internet of things,autopilot,wireless communication and other fields.With the rapid development and progress of science and technology,positioning navigation and timing information plays an increasingly important role in society.PNT technology plays an important role in national security and military applications,and is a dual-use technology related to national strategy.The traditional Global Navigation Satellite System(Global Navigation Satellite System,GNSS)cannot provide stable Navigation services under some special physical environments and is prone to interference and occlusion.The inertial navigation system itself also has the problem of error accumulation.The PNT service provided by both of them has its inherent defects.In order to enhance PNT service performance,the micro-inertial measurement unit and the high-precision clock are the core devices of the research based on the information processing unit and the satellite navigation system is the auxiliary device to carry out the research on PNT technology.Micro Inertial Measurement Unit(Miniature Inertial Measurement Unit,MIMU)and Atomic Clock Chip(Chip Scale Atomic Clock,CSAC)technology prompted the research of positioning,navigation and timing microsystem(Micro PNT system)to make effective achievements.Based on the PNT technology background,this paper studies the information processing unit of Micro-PNT system,including the main contents:(1)Introduction to the principle of Micro PNT system components.The principle of satellite navigation system,inertial navigation system and chip atomic clock are described.(2)Hardware design of Micro PNT system information processing unit.The hardware design of the information processing unit in the microsystem is mainly completed,including the schematic diagram and PCB design,as well as the analysis of the communication interface between modules and the selection of core chips.(3)Information processing unit software driver design.This paper mainly analyzes the design of DSP driven software and peripheral interface circuit CAN bus communication driver.(4)Research on deep integrated navigation technology of information processing unit.Based on the structure of deep integrated navigation system,error models of GNSS and inertial navigation system are analyzed,and state equations and measurement equations of the system are established.The effects of inertial assisted receiver acquisition and repositioning technology and chip atomic clock on receiver positioning accuracy are studied.(5)Functional testing and experimental verification analysis.Field tests were carried out on the whole microsystem to verify and analyze the performance and accuracy of the designed Micro PNT system information processing unit.