Evaluating a system in flight poses challenges that are not found in a laboratory environment. This paper discusses some of the issues involved in conducting an in-flight test to evaluate tracker accuracy, such as head movement, synchronization of time, changing coordinate systems, and interpolating data. The paper describes six types of accuracy: laboratory static, laboratory dynamic, installed static, installed dynamic, operational static, and operational dynamic. In general, as the realism of the accuracy increases, the difficulty in setting up a test to find the accuracy also increases. The authors present one possible method of finding installed static (ground testing) and operational static (flight testing) accuracies in a helmet- mounted tracker used in jet fighter aircraft. The calculations are straight forward, but data issues that cause measurement error, such as vibration and synchronization of time, must be dealt with. The paper's technical approach outlines one possible solution for dealing with in-flight challenges.


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