| 重力卫星微加速度计位移检测电路噪声分析 |
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| 引用本文： | 廖成旺,李树德.重力卫星微加速度计位移检测电路噪声分析[J].大地测量与地球动力学,2005,25(2):82-87. |
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| 作者姓名： | 廖成旺 李树德 |
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| 作者单位： | 中国地震局地震研究所,武汉,430071;地壳运动与地球观测实验室,武汉,430071;中国地震局地震研究所,武汉,430071;地壳运动与地球观测实验室,武汉,430071 |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 摘 要： | 对重力卫星微加速度计位移检测电路的输入输出关系进行了详尽的推导，对各种噪声进行了分析，并选取一组典型参数计算了具体数值。发现在所有位移噪声中，电阻的热噪声处于主导地位，而运算放大器的电压和电流噪声可以忽略。电阻的热噪声包含桥路电阻的热噪声和反馈电阻的热噪声。反馈电阻的热噪声可以通过减小反馈电容而减小．桥路电阻的热噪声则与反馈电容无关。位移检测电路的设计所能达到的最好水平是使其噪声处于桥路电阻的热噪声的水平。而桥路电阻的热噪声与探头结构参数、激励电压、温度和差动变压器品质因数等有关。
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| 关 键 词： | 重力卫星 加速度计 位移检测电路 噪声 分析 |
| 文章编号： | 1671-5942(2005)02-0082-06 |
| 修稿时间： | 2005年3月10日 |
ANALYSIS OF NOISE OF DISPLACEMENT DETECTING CIRCUIT OF ACCELEROMETER FOR GRAVITY SATELLITE |
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| Liao Chengwang,Li Shude.ANALYSIS OF NOISE OF DISPLACEMENT DETECTING CIRCUIT OF ACCELEROMETER FOR GRAVITY SATELLITE[J].Journal of Geodesy and Geodynamics,2005,25(2):82-87. |
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| Authors: | Liao Chengwang Li Shude |
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| Abstract: | Various type of noises of displacement detecting circuit of accelerometer for gravity satellite are analyzed and computed through deriving the relationship between input and output. It is found that the thermal noise of resistance is dominant while the contribution of operational amplifier is negligible. The thermal noise of resistance includes two parts: bridge resistance and feedback resistance. The latter can be lowered by decreasing feedback capacitance while the former is independent on feedback capacitance. The best noise level which we can acquire in the design of displacement detecting circuit is making it be the on thermal noise level of bridge resistance.However, the thermal noise of bridge resistance depend on parameters of sensor unit, exciting voltage, temperature and quality factor of differential transformer. |
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| Keywords: | gravity satellite accelerometer displacement detecting circuit noise analysis |
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