Contemporary positioning systems are expected to provide for precise and timely information about the parameters of motion of the vehicle, such as position, velocity, acceleration and attitude. In less demanding applications, a single navigational device may prove sufficient for this purpose. However, there exist numerous applications where a single device is not capable of fulfilling stringent requirements with respect to accuracy, reliability, continuity and integrity of positioning. In such cases, the optimal from a technical and economic point of view positioning system is composed of several navigational devices. Their data are jointly processed via a dedicated navigation filter.
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