ZHOU Hai-jun, HUANG Xiao-gang, ZHANG Wei-ping, et al. Digital amplitude demodulation for micro gyroscope with levitated rotor based on DSP[J]. 2007, (11): 36-38.
ZHOU Hai-jun, HUANG Xiao-gang, ZHANG Wei-ping, et al. Digital amplitude demodulation for micro gyroscope with levitated rotor based on DSP[J]. 2007, (11): 36-38. DOI: 10.13873/j.1000-97872007.11.007.
The angle variation signal for the micro gyroscope with levitated rotor
which is an amplitude modulated waveform
comprises carrier and angel variation signal.A digital modulation system is needed to demodulate the low-frequent signal in the modulated waveform using digital signal processor(DSP).A digital filter autocorrelation algorithm based on DSP
which can detect the output signal of the micro gyroscope with levitated rotor
is presented.It also shows how to achieve the algorithm.The demodulated signal is outputted by digital-to-analog converter and the asynchronous serial interface.The system is tested by a 20 kHz carrier sine wave modulated by low-frequent sine wave signal.The result shows that the system can response to low-frequent angle change of 25 Hz.So it can meet the demand of detecting the signal and the following control of the micro gyroscope with levitated rotor.
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references
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