Research Of Attitude Calculation Method For Simulation And Experiment Based On Geomagnetism Detection

With the change of the war situation in the new century, in order to adapt thecomplex changeable battlefield environment, the effective damage of the target isachieved. And the projectile’s flight attitude angle of the attainment is one of the criticaltechniques, nevertheless, because of the projectile’s high rotating speed the currentrotation speed measurement equipment to the required measurement requirements isunreached. Therefore, the projectile’s attitude angle measurement system based on themagneto resistive sensor is modeled and experimented in this paper.The formation mechanism, the common geomagnetic field description, and thecalculated model of the geomagnetic field were appreciated profoundly. Combined withthe data gained from geomagnetic software, the feasibility of the geomagnetic fieldapplication in projectile’s attitude angle system is analyzed, and the principle of themagnetic sensor is introduced and their advantages and shortages are analyzed.On the basis of the inertial navigation system, the coordinate model and coordinatetransformation are introduced. The geomagnetic detection technology and its relatedtheory are researched. An attitude angle measurement navigation system based onmagnetic sensor and a magnetic sensor calibration method are proposed. Three methodsfor calculating projectile rolling angle are put forward, including the straight linemethod, rotation method and the check function value method. Taking the example as acertain type of projectile, according to the6degrees of freedom trajectory equation, theprojectile motion trajectory mathematical model is established. By the comparedexperiments in the digital simulation based on the magnetic sensor attitude algorithmsystem and the inertial navigation system, the results utilized the system algorithm ofthe magnetic sensor precision which is higher than that of the inertial navigation systemshows that the errors to the attitude algorithm is no more than10deg. An FPGA-basednavigation system is built. The system contains the magnetic sensor, the gyroscope, theaccelerometer, the thermometer and GPS. The inertial navigation system is designed for the semi-physical experimental testing. The results from the experiment shows that themagnetic sensor based on attitude solution for system design is feasible and effective.