The paper is concerned with methods of improving the accuracy, continuity and integrity of airborne navigation systems. The core concept considered is integration, or combination, of navigation sensor data. The principles of integrated navigation and optimal estimation theory are discussed. The complexity of navigation system requirements is described, and a comprehensive system design approach is presented. The paper concludes by looking at specific issues which arise in testing integrated navigation systems. The paper is biased towards military vehicle navigation. However the potential for application in commercial vehicles is evident. (17 pages)


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