Patent ID: 8538607
Filing Date: 2013-09-17
Classification: G01C,G05D

Abstract:
1. An attitude heading reference device for an aircraft, the device comprising: at least one interface for receiving heading information from one or more inertial reference units (IRUs); at least one set of gyroscopes and accelerometers; a memory device for storing data representing heading information received via the at least one interface; a heading calculator coupled to the at least one interface, the at least one set of gyroscopes and accelerometers, and the memory device, the heading calculator generating a heading output signal based on heading information from the one or more IRUs when reliable heading information is received over the at least one interface, the heading calculator generating the heading output signal based on data from the memory device regarding previously reliable heading information and an output of the at least one set of gyroscopes and accelerometers when reliable heading information is not received over the at least one interface; a voter module for generating a slaving signal from the heading information received over the at least one interface, the heading calculator coupled to the voter module; and wherein when reliable heading information is received over the at least one interface, the heading calculator generates the heading output signal using the slaving signal.