Study On Rolling Angle Measurement Of Flight Body Based On Geomagnetic Field

In order to improve the attacking precision of flight body such as guided projectile andcontrol the moving trajectory, the primary problem is to measure the rolling angle of it in realtime. It is contacted with anti-interference ability and stability of the operation. Geomagneticfield owns the advantage of wide coverage, high reliability and excellent stability. Meanwhile,GMR sensor owns the feature of high sensitivity, small volume, low power and anti-adverseenvironment. It is useful in measuring the low-intensity magnetic field. So rolling anglemeasurement scheme based on geomagnetic field is proposed.First, the rolling angle measurement model is established on the basis of analyzing thegeomagnetic environment and the real-time decoding algorithm is derived. The application ofgeomagnetic map and accelerometer in free parameter is studied. The hardware measurementsystem based on the STM32F107is designed in view of the measurement requirement of rollingangle. It contains the signal conditioning circuit and signal processing circuit. The overloadsource in system is analyzed to enhance the Shock-resistibility.Then, the system performance is launched. The least-square method is used to modify thesensor parameters. A moving average filtering of extremum value algorithm is put forward todecrease the magnetic interference occasionally and the effectiveness is verified.Finally, the rolling angle has a actual measurement. The test result proves that the algorithmis corrected outside the blinding area. The system can satisfy the measurement indication.