CONCEPTS FOR ERROR MODELING OF MINIATURE ACCELEROMETERS USED IN INERTIAL NAVIGATION SYSTEMS
Journal Title: ANALELE UNIVERSITATII DIN CRAIOVA - Seria Inginerie electrica - Year 2010, Vol 34, Issue 34
Abstract
The paper is a study of the error models for the acceleration sensors used in the strap-down inertial navigation systems. Two categories of errors models, presented in the literature, are described: IEEE standardized models, and un-standardized derived models. Generally the models contains the scale factor error, the asymmetric scale factor error, the nonlinear scale factor error, the misalignment errors, the nonorthogonality errors, noise and all the static errors terms. Also, a simplified model considering the parameters from the real sensors data sheets is analytically established and software implemented using Matlab/Simulink software. The model can be successfully used in the numerical simulation of any strap-down inertial navigation system, to create similar conditions with the real ones from the point of view of the distortions that affects the useful acceleration signal, when passing through any accelerometric detection device desired to be implemented in the sensing block of the navigator. Another advantage of this software implemented model is the possibility to have in the disturbed acceleration signal, used in numerical simulation, each type of the sensor’s errors taken independently or any combination between these errors; the model allows the selection of any sensor’s errors or combination between them to be superposed on the acceleration applied along of the accelerometer sensitivity axis.
Authors and Affiliations
Teodor Lucian GRIGORIE, Mihai LUNGU, Ioana Raluca EDU, Radu OBREJA
Keywords
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