Car Networking/micro Inertial Integrated Navigation Satellite Positioning System Research

Vehicle networking as an important application direction of the Internet of Things(IOT), it is the product of socio-economic and industrialization process development, butalso an important symbol of the car into the era of intelligent. In some automobileindustry developed countries, for instance Europe and the United States and Japan, etc.Vehicle networking technology has developed rapidly in recent years, the demand forVehicle networking technology of domestic is also growing strongly. At first, the vehiclenetworking just in order to solve the serious urban traffic problems brought by theincreasing vehicle, but with the development of the vehicle networking technology, it hasbeen used in anti-theft alarm, energy conservation, medical assistance and vehiclescheduling, etc. Vehicle Navigation System is the core and fundamental of the entirevehicle network system, with the increase of this technology application in each aspect,its original GPS navigation system highlights the various deficiencies. For example itcould not provide vehicle attitude information, in the city buildings and tunnelenvironment easily lost star unable to locate and susceptible to interference, etc. Indesperate need of an upgrade product appear to make up for the market blank andinsufficiency.Aiming at the insufficient of existing Vehicle networking GPS navigation system,research the development trend of existing navigation field, the author presents a set ofsmall chips satellite/micro inertial integrated navigation positioning system based onMEMS inertial device. First, through in-depth research of the existing Vehiclenetworking GPS satellite positioning system theory, analysis Vehicle GPS navigation andpositioning system faults and error sources. Then detailed derivation the strapdowninertial navigation system mathematical model and error model, and discussed thecharacteristics of MEMS gyroscope zero offset by the influence of the temperature andputs forward a kind of large temperature difference application environment ofcompensation model. Then discusses the advantages and disadvantages of loosecombination, tight combination and super tight combination model for GPS and SINSsystem, established state equation and measurement equation of GPS/INS navigationsystem based on loose combination mode integrated, In view of the problem of vehiclerunning characteristic and MEMS gyro error larger, introduced the body constraintfactors and increase magnetic observation quantity. re-established the filtering equation, through the simulation software proves the validity of this method. Finally in the theoryguidance through the ingenious structure design and high integration circuit design,achieved a subminiature low power consumption of GPS/SINS integrated navigationsystem based on theARM embedded system as hardware platform.This scheme combined with GPS and strapdown inertial navigation systemadvantages. It has the following features: ultra-small (50cm3), low power consumption(0.5W), ease of installation, attitude information of the vehicle can be displayed in realtime, in order to ensure the normal operation of the vehicle; solved the problem that ashort period of time lost Stars can’t locate in urban high-rise buildings, tunnels, and otherplaces, can realize to monitor the vehicle anywhere in the world; improved positioningaccuracy, enhanced anti-interference ability and reduced the single GPS systemmisleading rate, reduced the operating costs and saved a lot of energy and time. Finally,through the coupe experiment, verify the viability and stability of the system.