从PURSUE传感器视频中恢复速度的限制
Limits on Kinematic Inference from the PURSUE Airborne Sensor Videos
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中文总结 AI 辅助
本文分析美国战争部PURSUE计划发布的112个UAP传感器视频，发现其因信息缺失无法将像素/帧速率转换为物理速度，仅部分片段能提供有限参考，无法明确区分UAP性质或异常速度。
中文摘要 AI 辅助
本文分析了美国战争部在PURSUE（美国不明异常现象遭遇总统解密与报告系统）计划下发布的112个传感器视频。屏幕显示内容的编辑限制了用于识别所报告不明异常现象（UAP）性质的可用信息。任何物体穿过部分或全部帧的速率可以像素/帧为单位测量；然而，将其转换为物理速度还需要：（1）到物体的距离，（2）观测飞行器的速度，（3）物体路径与观测者之间的方位角，以及（4）相机传感器的视场角。PURSUE数据集中没有任何传感器视频提供这一完整信息集。在一段片段（DOW-UAP-PR113）中，物体穿过可见的俯角标记，从而可以重建相机的视场。即使是这段片段也没有提供足够的信息来区分是近距离飞过传感器的鸟类，还是在1公里外以5马赫飞行的大型飞行器。第二段片段（DOW-UAP-PR149）包含一个已知尺寸的船只在帧中，可作为参考来计算物体相对速度的上限为0.4马赫。没有进一步的信息，目前形式的PURSUE传感器视频无法完全解决不明案例或明确指示异常速度。
英文摘要
This paper analyzes the 112 sensor videos released under the PURSUE (Presidential Unsealing and Reporting System for UAP Encounters) initiative. Redactions to on-screen displays limit information available for identifying the reported unidentified anomalous phenomena (UAP). Converting the rate at which any object transits across part or all of a frame from pixels per frame to a physical velocity requires (1) the range to the object, (2) the velocity of the observing aircraft, (3) the aspect angle between the object's path and observer, and (4) the field angle of the camera. No PURSUE video provides this set of information. In one clip (DOW-UAP-PR113), the object crosses depression-angle markings, which allows reconstruction of the camera's field of view. Even this clip does not provide sufficient information to distinguish between a bird flying at close range and a large craft traveling at Mach 5 a kilometer away. A second clip (DOW-UAP-PR149) includes a vessel of known size in the frame, which can be used as a reference to calculate an upper bound of Mach 0.4 on the object's relative velocity. Without further information, the PURSUE sensor videos in their present form cannot fully resolve unidentified cases or conclusively indicate anomalous velocities.
