Priot, Benoit and De Boer, Jean-Rémi and Guidoux, Rémi and Calmettes, Vincent Performance assessment of integrated MEMS/GNSS systems. (2008) In: Conférence Européenne de la Navigation (ENC-GNSS), 23-25 April 2008, Toulouse, France .
(Document in English)
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Vehicle navigation systems often include an Inertial Measurement Unit (IMU) to bridge GNSS satellites outages (signal blockage, jamming) or to mitigate GNSS signal degradation (jamming, multipath). In the past, this added information provided by Inertial Navigation Systems (INS) has been integrated with Global Positioning Systems to provide high accurate, but high cost navigation systems. Recently, a new generation of inertial sensors called Micro-Electro-Mechanical Systems (MEMS) has become available at relatively low cost and allows to use integrated INS/GPS systems in a lot of new applications, as land vehicle applications. Performance of these systems is largely dependent upon the inertial sensors quality. Inertial sensors errors have a bias instability which affects the accuracy of the navigation system. As a “rule of thumb”, an inertial navigation system equipped with gyroscopes whose bias instability is 1°/hour leads to a position error of 60 nautical miles over 1 hour.
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