A New Solution for Acceleration Measurement in Vibra-tion Conditions

This paper introduces a solution for exploiting merits of the Micro Electro Mechanical Sys-tem (MEMS) accelerometers in practical applications as much as possible. This solution con-sists of two divisions. The first division is a solid carrier with five planes on each of which, a 3-channel MEMS accelerometer is installed. The second division of the proposed solution is a novel but simple-structured software designed for achieving two crucial targets: removing spikes and noises from the output of the accelerometers without having any a priori infor-mation about the desired frequency bands. The second mission of the processing software is to participate all accelerometers according to their measurement quality for determining the solid case accelerations. The criterion for ranking the channels of the accelerometers is based on their correlation index with the most informative channels among all operating accelerom-eters. By some simulation studies, the accuracy of the proposed solution for correct identifi-cation of spikes is about 99.99%. Also, by randomly adding the random-walks noise and spikes to the channels of the embedded accelerometers and by altering the amount of input noise, the relative error of the rigid body acceleration is given according to input acceleration quality. By implementing the proposed noise and spike reduction algorithm given the quality value about 0.90, the relative navigation error-rate is enhanced from 0.75 sec-1 to 0.1 sec-1 for linear positions and 1 sec-1 to 0.12 sec-1 for angular attitudes. Also the full-scale error-rates associated with the aforementioned relative-error rates are 0.28 sec-1, 0.02 sec-1, 0.2 sec-1, 0.01 sec-1, respectively

Keywords:

Gyro-Free Navigation System , Spike , Navigation Error-Rate , MEMS Accel-erometer , Signal Quality , Weighted Least-Squares