The Key Technology Research Of The Differential Pressure Altimetry In TC-OFDM Navigation And Positioning Sysytem

In recent year,as a major national strategic emerging industry,location based services(LBS)have been widely used and been affecting people's daily lives.With the speeding up of urbanization and further improvement of people's living standard,the demand of location service grows rapidly when dealing with indoor navigation,asset management,security monitoring,security dispatching,emergency rescue,and many other aspects.However,at present the mainstream positioning navigation system only provides users with accurate longitude and latitude information,and vertical positioning information can't been taken advantage of because of the poor precision.This topic focuses on the differential pressure altimetry.This technology can provide accurate vertical height information for indoor and outdoor location service.This topic will provide important theoretical basis and technical support for the evolution of traditional 2D location service for the high precision of 3D indoor and outdoor location service.Baesd on the theory of differential pressure altimetry,an system is designed,which is meter-level high precision measurement system,and fristly used in TC-OFDM navigation and positioning system.The specific research contents and results are as follows:(1)This topic focuses on the theory of the differential pressure altimetry,and do the performance test for the theory.With the introduction of the current mainstream high measurement technology,we know the existing high measurement technology can't been used in indoor and outdoor high-precision 3D location service because of technical bottleneck such as low measurement accuracy,high cost or large volume,etc.The paper uses the theory of differential pressure altimetry to break through the bottleneck,and provides related performance verification.(2)Based on the differential pressure altimetry,designing the differential pressure altimetry subsystem in TC-OFDM navigation and positioning system.The differential pressure altimetry subsystem consists of two entities which is navigation message generator and terminal pressure measurement function module.And the related core network protocol and wireless transmission network protocol are formulated.(3)In view of the poor measurement environment,calibration model is established to improve the differential pressure altimetry subsystem robustness.In this poor measurement environment such as the windy weather in outdoor,fire scene in indoor,the differential pressure altimetry will have a poor precision.Based on morphology,a variety of pressure change characteristics and aerodynamics of typical bad environment,setting up correction model with scene intelligent identification fuction and high calibration function to improve the measurement accuracy in those environment.