The Redundant Micro Accelerometer Combination Design Based On ARM

Heading and attitude are the indispensable important parameters of the inertialnavigation system.With high complexity of modern spacecraft, especially manned bymillions of components of the spacecraft, carrier can get real-time heading and attitudeparameters, also asks that the inertial navigation system must have a small volume, lowcost, low power consumption, low noise, simple maintenance and high precision, goodstabillty, fast start, the ability to work full time,powerful real-time performance and highperformance work requirements such as high performance requirements, the traditionalinertial measurement unit, expensive because of the large volume, high reliability andlow error faults have been unable to meet the requirements of the above indicators.Combination based on MEMS(Micro-Electro-Mechanical System) inertialmeasurement technologyis developed in recent years,which is not dependent onexternal information nor the external radiation energy of autonomous new technology,good concealment, high data update rate, short time and high precision, good stability,smaller volume and the advantages of light weight, can fully make up for theinadequacy of the traditional Inertial Measurement technology.With the development of32-bit microprocessor technology and the realization of the industrialization ofminiature high performance of inertial sensor, which makes development that couldsatisfy the requirement of high performance micro data acquisition system into reality.Based on the combination used in spacecraft test system of miniaturization andintegration into the background, the design adopts the processor STM32F417ZG whichuses the kernel of ARM Cortex-M4as the main control unit, a wireless transmissionfunction, RS232interface, the CAN interface and RS422/RS485interface technologywith six dimensional measurement output combination of integrated microaccelerometer system.In the aspect of the system hardware design, the use of hardware resources, and theARM microprocessor of high operation speed, greatly improve the performance of thesystem.Data transmission interface, actual application is very widespread.Using digitaland analog acceleration sensor, the output acceleration data backup each other mutualverification (redundanct), guarantee the stability and practicability of the system.In terms of the system software design, write the system initialization program andthe application of data acquisition and transmission, using LabVIEW software to writethe PC receives the data graphical interface program.Application portability is strong, inthe process of practical application is very convenient, to work on other systems designprovides a reference basis, and will save you a lot of precious time overhead. In terms of acceleration sensor error compensation and calibration design, putsforward the simulation type gravity field rolling method for MEMS acceleration sensorcalibration scheme and scale transformation algorithm, and type MEMS accelerationsensor of various error sources of compensation scheme, accelerometer calibration andcompensation for late work provides a theoretical basis.