A Design And Research Of Attitude Test System And Magnetometer Used For Rocket Projectile

Precision-guided conventional ammunition is one of the hot researches in military-guided navigation area both in domestic and overseas now. The rocket projectile whichachieves the advantages such as low cost, long range and good mobility plays an importantrole in the conventional ammunitions. So countries over world are committed to precision-guided rocket research. For precision guidance, it is essential to achieve the high precisionattitude parameters of the rocket projectile.In order the requirements, development and characteristics of the magnetic sensormissile attitude measurement technology are deeply studied in this article. A high precisionmagnetic sensors is designed which can be used to measure the other two rockets attitudeangles by the method of magneto resistive sensors measurement of the earth’s magnetic fieldsignal in the condition of one attitude angle is known.The magnetometer hardware and software are design in this paper and a prototype isdeveloped. In the hardware design, for magnetic sensor is easily affected by the temperaturechange, low output voltage, the constant current source circuit, amplifying circuit and low-pass filter circuit, A/D conversion circuit and reset circuit are designed. In order to avoid thesensor output to be influenced by the interference of ferromagnetic materials, according to thegiven projectile installation space from our cooperation unit, magnetometer aluminummechanical shell is designed. With a magnetic field generator for magnetometer calibration,the magnetometer static characteristics meet the requirements of design.The whole system in simulation experiment is carried out on the three-axis turntable: projectile only with roll motion. The system’s precision and sensitivity are analyzed accordingto the calculation of the movement patterns. At last the quadrature error appeared in theprocess, the interference of magnetic field environment uncertainty of error and externaldisturbance are analyzed and corresponding error compensation method is put forward.Geomagnetic field signal is measured by this design with magnetic resistance sensor,then the data of attitude algorithm are calculated to realize the measurement of missile attitudeangle, and is not limited by range with the advantages of high overload resistance strength,small volume, low power consumption and error does not accumulate over time.