Research Projects

Hemispherical Resonating Gyro (HRG) is a class of Vibratory Gyroscopes with very high Q factor (? 5 million) and thus very low resonance bandwidth (? 1.5 milli-Hz). To operate this sensor at its resonance, high fidelity sinusoidal excitation is essential so that the frequency spectrum is comparable to the resonance bandwidth. Hence, a waveform synthesiser which can generate pure tone sinusoids with less than 1 milli-Hz frequency standard deviation is to be designed.For precise tracking of HRG resonant frequency during temperature variations, frequency resolution of the synthesiser must be much smaller than resonance bandwidth as well. The project envisages an FPGA which shall enable development of an ASIC based hardware which can synthesise spectrally pure sinusoids suitable for HRG WAT(Whole Angle Tracking) and can be easily interfaced with an external controller.