Use of spectral methods in strapdown ISS data processing
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Characteristic frequencies and frequency bands are identified in the output of the inertial sensor block in a Ring Laser Gyro Strapdown Survey System by using Fast Fourier Transformation and are related to physical causes such as vehicle motion, environmental noise and sensor errors. A significant disturbance in the gyro and accelerometer outputs caused by the dither mechanism of the laser gyro is discussed. A frequency filtering approache to decrease the disturbing frequencies are studied. The effect of the filtering on the system performance is presented for field test results.
KeywordsFast Fourier Transformation Amplitude Spectrum Inertial Sensor Vehicle Motion Inverse Fast Fourier Transformation
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