Angular Rate Extraction Algorithm Research Based On No Drive Triaxial MEMS Gyroscope Used For Rotating Missile

In the process of reform of conventional munitions guidance, the traditional rategyroscope could not undertake normal work in high speed and high overload environment.According to high speed rotating of smart ammunition, utilizing a kind of MEMS gyrotrapped down on projectile can acquit themselves of triaxial angular rate measurement.As the output signal of the three-axis MEMS gyro combined of roll velocity, pitch andyaw angular rate. It is very vital for how to extract triaxial angular rate information from theoutput signal accurately. Based on this problem, firstly, three-axis angular rate decodingscheme is proposed in this paper according to the mathematical model of the gyro outputsignal and the signal characteristics. Then discussing the two key technologies which isfrequency and phase discrimination.This article focuses on the technology of the signal frequency demodulation. Thecalculating accuracy of the yaw angular rate and pitch rate are based on extraction accuracy oftime-frequency information and comparing the extraction methods of time-frequencyinformation based on time domain and frequency domain. The conclusion is that the rotatingspeed measurement based on least square methods is most suitable, then researching itsperformance. The most suitable afterwards time-frequency information extraction method issliding window based method for CZT. It was discussed how the length of sliding windowand SNR factors affect the calculating accuracy of the algorithm; In addition, this paperstudies the technique of phase and obtain the relevant law as the most suitable phaseextraction algorithm.Finally, the semi-physical simulation experiments based on three-dimensional turntable is designed and respectively verifying the algorithm successfully when yaw and roll angularrate, pitch and roll angular rate and triaxial angular rate are input. Then the calculatedthree-axis angular rate and the theoretical angular rate are compared while the correctness ofthe triaxial angular rate calculating solution and the practicability of frequency and phasedetecting method are verified.