This paper mainly studies how to accurately fit the air dynamics parameter by the ballistic data of projectiles' free flight.

论文主要研究从弹丸自由飞行数据中如何准确地拟合空气动力系数。

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Without ballistic plates, the KDH plate carrier weighs 6.47 pounds, according to PEO Soldier data.

根据PEO士兵的数据，KDH的防弹携行装具除了弹道板重约6.47磅。

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As a primary problem of Ballistic target tracking which is a key technology in radar data processing, tracking initialization plays a very important role.

弹道目标的跟踪是雷达数据处理的一项关键技术，航迹起始作为目标跟踪的首要问题，重要性是不言而喻的。

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America has long been urging its Gulf allies to take seriously the threat of Iranian and Iraqi ballistic missiles, and has now offered to share data from its early-warning detection satellites.

ECONOMIST: The Gulf