Table 13.
Comparison of some typical kinds of micromachined gyroscopes.
Categories |
Performance (at Present) |
Characteristics (in Theory) |
Application |
---|---|---|---|
MVG | Better level, bias drift has reached sub-degree per hour | Ease to control, high stability, have suspending springs and proof masses, poor robustness, mode mismatched, usually vacuum packaged | Mature at present, the most widely used in the micromachined gyroscope market |
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PVG | Lowest | Good robustness, wide measuring range and higher resistance to shock and shake, can work in atmospheric environment, poor stability, hard in signal extraction | Less used at present |
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SAW gyroscope | Lower | Good robustness, very wide measuring range, low power consumption, low sensitivity, compatible with standard IC process, complex measurement circuit | Less used at present, but have good application prospect because of low power consumption and wireless circuitry |
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BAW gyroscope | Good level, bias drift can reach tens of degree per hour | High resonant frequency and Q-factor, very low noise floor, low cost, sustaining electronics noise and high bandwidth requirement due to the high frequency | Less used at present, but have good application prospect |
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MESG | Middle level, bias drift can reach dozens of degree per hour | Long life without mechanical friction, insensitive to fabrication tolerances, mode coupling, high cost, complex circuitry | Have some application at present, and will have best application prospect |
| |||
MSG | Low | Simple structure, no energy input and simple control circuit, very little mechanical friction, insensitive to fabrication tolerances, can work at atmosphere, mode coupling, poor stability | Technology is still not mature enough, less used at present |
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MFOG | Several degree per hour | High precision, long life and robustness, wide dynamic range, strict light source and signal process, high cost | Technology is still not mature enough, have improvement space |
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MAG | Still developed | Potential high sensitivity, ultra-small volume, ultra-low power consumption, hard detection, high requirement for measurement instrument | Technology is still not mature enough, have improvement space |
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MFG | Low | Long life, good robustness, ultra-low cost, low precision | Have improvement space in low precision fields |