DESIGN AND FPGA IMPLEMENTATION OF NONLINEARITY COMPENSATION OF CAPACITIVE PICK-OFF MEMS ACCELEROMETER FOR SATELLITE LAUNCH VEHICLES

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International Journal on Smart Sensing and Intelligent Systems

Professor Subhas Chandra Mukhopadhyay

Exeley Inc. (New York)

Subject: Computational Science & Engineering, Engineering, Electrical & Electronic

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eISSN: 1178-5608

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VOLUME 2 , ISSUE 2 (June 2009) > List of articles

DESIGN AND FPGA IMPLEMENTATION OF NONLINEARITY COMPENSATION OF CAPACITIVE PICK-OFF MEMS ACCELEROMETER FOR SATELLITE LAUNCH VEHICLES

Thampi Paul * / S.Vijin Jenius * / M. Sasi Kumar

Keywords : Accelerometer, Linearity, FPGA, error compensation

Citation Information : International Journal on Smart Sensing and Intelligent Systems. Volume 2, Issue 2, Pages 213-228, DOI: https://doi.org/10.21307/ijssis-2017-347

License : (CC BY-NC-ND 4.0)

Published Online: 02-November-2017

ARTICLE

ABSTRACT

This paper presents the algorithm on the compensator design for eliminating the nonlinearity in the capacitive pick-off MEMS open-loop accelerometer and its implementation in the FPGA. A simple and elegant method is presented for the purpose. In the sensor model of compensator, upto 3rd order terms are taken. The first step approximation is derived using linear model. This approximation is improved over iterations to reduce the non-linearity. With this method, the inertial navigational grade performance is achieved. The algorithm is coded in VHDL, simulated, synthesized and implemented in the FPGA and tested. Test results matches closely with that of simulations. The VHDL design can be easily targeted into an ASIC to realize an integrated smart sensor.

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REFERENCES

[1] Thampi Paul etl “Design and optimization of bulk micromachined accelerometer for space applications” in International Journal on Smart Sensing and Intelligent Systems,
2008, pp 1019-1030.
[2] Elwenspoek, “Mechanical Microsensors,” Springer, New York, 2002
[3] Gad-El-Hak & Mohamed, “MEMS Hand Book,”CRC Press, Boca raton, 2002.
[4] Thampi Paul P, Vijin Jenius S and Sasikumar M, “Characterization and Nonlinearity compensation of Capacitive sensing MEMS accelerometer for launch vehcle applications,” in Proceedings of the National Society for Insturmentation of ISOI (NSI-30), 2005, pp. 417-421.
[5] Hsu & Tai-Ran, “MEMS and Microsystems-Design and Manufacture,” Tata McGraw-Hill, New Delhi, 2002
[6] Fraden, “Hand Book of Modern Sensors-Physics, Design and Application,” Springer, New York, 2004
[7] J. BHASKER, “ A VHDL PRIMER”, Pearson Education, 3rd e.d., pp. 316-318, New Delhi, 2003

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