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Copyright of Computer Measurement & Control is the property of Magazine Agency of Computer Measurement & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Control Theory & Applications / Kongzhi Lilun Yu Yinyong is the property of Editorial Department of Control Theory & Applications and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Test & Measurement Technology is the property of Publishing Center of North University of China and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Piezoelectrics & Acoustooptics is the property of Piezoelectric & Acoustooptic and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Test & Measurement Technology is the property of Publishing Center of North University of China and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Inertial guidance system plays a very important role in guided artillery. Micro electro mechanical system (MEMS) gyroscope, as the core component of inertial guidance system, has high resistance to overload and restricts the application of inertial guidance system in high overload environment directly. First of all, the high overload environment in the gun chamber is modeled and quantified, and the mechanism of high overload failure of the MEMS gyro structure is summarized. Secondly, based on the previous public research results from different institutes at home and abroad, the anti-high overload MEMS gyroscopes with different monitoring methods, different structural forms, different structural materials and different working principles are introduced from the perspective of anti-overload characteristics of MEMS gyroscopes impact resistance. Finally, the related reports and papers are summarized, and it is pointed out that the anti-high overload MEMS gyroscope should be designed from the aspects of drive-detection mode, reasonable structure of energy-absorbing and energy-dissipating structure, working principle, new structural material and multi-level system buffer methods to improve the anti-high overload ablility.

Copyright of Journal of South China Agricultural University is the property of Gai Kan Bian Wei Hui and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Piezoelectrics & Acoustooptics is the property of Piezoelectric & Acoustooptic and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Multi-MEMS monitoring system is a new technology for safety monitoring of high-panel rockfill dams. In actual monitoring, due to the temperature difference between the inside and outside of theoperational pipeline, the MEMS gyroscope will drift and affect the measurement accuracy. In order to suppress the influence of temperature drift on the output of gyroscope, the temperature drift law of MEMS gyroscope was summarized by the experiment of indoor temperature characteristics. On the basis of this, a least squares polynomial compensation model based on regression theory and first-order Markov chain compensation were established. The model was compensated by two methods. The results show that both methods can effectively reduce the yoke zero-bias stability and the Markov chain model has higher compensation accuracy which can better reflect the deflection of the panel and the deformation of the rockfill settlement. It also can provide a reliable basis for safety assessment of dam operations. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Test & Measurement Technology is the property of Publishing Center of North University of China and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Chongqing University of Posts & Telecommunications (Natural Science Edition) is the property of Chongqing University of Posts & Telecommunications and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Hebei University of Science & Technology is the property of Hebei University of Science & Technology, Journal of Hebei University of Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Piezoelectrics & Acoustooptics is the property of Piezoelectric & Acoustooptic and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Piezoelectrics & Acoustooptics is the property of Piezoelectric & Acoustooptic and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Piezoelectrics & Acoustooptics is the property of Piezoelectric & Acoustooptic and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Piezoelectrics & Acoustooptics is the property of Piezoelectric & Acoustooptic and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Signal Processing is the property of Journal of Signal Processing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Chongqing University of Posts & Telecommunications (Natural Science Edition) is the property of Chongqing University of Posts & Telecommunications and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Piezoelectrics & Acoustooptics is the property of Piezoelectric & Acoustooptic and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In precision agricultural equipment automation testing process, sensors on agricultural vehicles for collecting information need to keep the relative position with the ground from impact of narrow, uneven and complicated conditions. In the requirements of obtaining accurate attitude and position about the sensors relative to the ground level and to alleviate this problem, a two-axis attitude control system based on MEMS sensors was proposed. Firstly, the operational principle and control methods were analyzed. The Euler angles coordinate transformation method was introduced which is used to describe objects position accurately in inertial space. Secondly, the hardware and software of the attitude control system were designed. The system hardware includes power supply, accelerometer and gyroscope sensors, stepping motor drive, LCD and serial communication. The control system had two axis of rotation called pitch axis and roll axis, which was driven by stepping motor in each axis. And the system was controlled by microcontroller to drive two stepping motors to keep the relative level with the ground. What is more, the accelerometer is used to measure the acceleration of gravity in the condition of static, and the gyroscope is used to measure the angular velocity, so that the attitude control system used these two MEMS sensors to estimate the platform angle. The data of the gyroscope and accelerometer are real-time sampling to gain and analyze the current attitude angle. Therefore, multi-sensor information fusion algorithm and attitude estimation model were established. The complementary filter with two kinds of sensors was used to estimate the angle which had a time constant to define where the boundary between believing in the gyroscope and believing in the accelerometer is. Specifically, for the time periods shorter than time constant, the gyroscope integration takes precedence and the noisy accelerations are filtered out. And for the time periods longer than time constant, the accelerometer average is given more weighting than the gyroscope. Thus the control system chose the appropriate parameters to estimate the accurate angle which meet the requirement of system maximum control error. Finally, The PM signal was output by microcontroller driving to the stepping motor. Then PM signal was sent to stepping motor actuator to make the stepping motor turn a step angle. Additionally, the PD controller was used in the system in order to achieve rapid control in order that the two-axis direction was driven by stepping motors which made a quickly response to eliminate the horizontal deviation and kept the relative position with the ground. Two absolute encoders are also fixed on each axis. They were used to keep the system automatically reset to the initial position when the system started to work. The test results show that the system runs stably and the method of estimating angle is suitable for low and middle speed changing conditions. Single axis attitude control accuracy is less than 0.5 ° in the condition of flat slope of the road and is less than 3.0° running in the bumpy field road. The stabilized platform system meets the demands of the attitude automatically adjust to the constant orientation in the information collection process and attitude estimation process. [ABSTRACT FROM AUTHOR]

In order to improve the precision of the MEMS gyroscope, The static error of the MEMS gyroscope is analyzed and the output model and calibration principle of the MEMS gyroscope is established, and then a novel precision calibration algorithm of the weighted recursive least square (RLS) method is proposed. The novel precision calibration algorithm can achieve the high precision calibration of the MEMS gyroscope. Furthermore, an effective adaptive filter processing method is provided for the low precision MEMS Gyroscope. The analysis for a large number of the experiment data shows that the performance of the MEMS gyroscope is obviously improved after its error is compensated by the proposed calibration algorithm. [ABSTRACT FROM AUTHOR]

To eliminate the common mode input in the the micromachined gyroscopes, a novel architecture of the micromachined gyroscope is proposed in this paper. The structure of the MEMS is designed to be symmetrical, and two degree of freedom (DOF) oscillators are utilized in both drive-mode and sense-mode. Driving force actuates two driving masses to move with anti-phase in drive mode. The novel architecture consists of identical left and right tines, which provides immunity to common mode input of environmental variations. To avoid the coupling between drive-mode and sense-mode, the drive-mode suspensions are introduced in sense-mode. The gyroscope is designed to be double-decoupled structure. Compared to the drive-mode of the proposed gyroscope, the gain of frequency response is increased by about 30 dB in the sense-mode. The bandwidth of drive-mode and sense-mode are 250 Hz and 310 Hz respectively. The gyroscope can provide stable gain and phase in the operational frequency region, and provide immunity to common mode input of environmental variations. [ABSTRACT FROM AUTHOR]

A balanced vibration of driving module excited by electrostatic driving signal is the working base for MEMS gyroscope. In order to analyze the linearity of the vibration system, a method based on computer vision is applied to detect the vibration process, which works with the help of high-speed vidicon to acquire the video images of vibration displacement of gyroscope driving module, under the AM (amplitude modulation) driving voltage signal with inherent frequency. By means of image processing, target identifying and motion parameter extracting from the video images, the vibration of the gyroscope with time variation could be obtained. Finally, linearity of the vibration system could be analyzed by focusing on the displacement of vibration responding to the amplitude of driving voltage signal. [ABSTRACT FROM AUTHOR]