Highly-energetic targets such as rocket plumes and detonation fireballs are difficult to locate and track effectively with active sensors that rely on reflection, but traditional passive sensors cannot determine range. Development of a passive ranging sensor will enable accurate target location and tracking while simultaneously improving covertness. Recent work is presented on development of a passive sensor to estimate range using spectroscopic measurements of atmospheric absorption. In particular, advantages of measuring absorption on the O2(b-X) transition near 762nm are discussed. Theoretical predictions are compared with experimental results to verify model performance at short ranges (up to 200m). Range accuracy better than 1% has been demonstrated using a Fourier transform spectrometer at short range. Extension of the theory to long range (in excess of 100km) is also discussed.

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The esports market has been growing exponentially has been growing exponentially with much interest from industry and academia. Perhaps because of this growth, there is a lack of agreement on what esports actually encompasses. We conducted a systematic review of 461 peer reviewed, full papers that provide a definition of esports. Findings highlighted the growth of the esports field across different domains, and increasing global interest in esports, but a lack of consensus regarding definition of the term. Through thematic analysis we identified nine dimensions across esports definitions. We critically assess these dimensions in terms of their representativeness and utility in describing the multifaceted nature of esports. Our work may help create a shared understanding of what esports is- and is not-capturing a diversity of experiences within organized competitive gaming and supporting continued research growth in this increasingly important domain.

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