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首页> 美国政府科技报告 >Shuttle Derived Atmospheric Density Model. Part 2. STS Atmospheric Implications for AOTV (Aeroassist Orbital Transfer Vehicle) Trajectory Analysis, a Proposed Gram Perturbation Density Model.
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Shuttle Derived Atmospheric Density Model. Part 2. STS Atmospheric Implications for AOTV (Aeroassist Orbital Transfer Vehicle) Trajectory Analysis, a Proposed Gram Perturbation Density Model.

机译：航天飞机导出的大气密度模型。第2部分。对aOTV（气动辅助轨道转移飞行器）轨迹分析的sTs大气影响，提出的Gram扰动密度模型。

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A perturbation model to the Marshall Space Flight Center (MSFC) Global Reference Atmosphere Model (GRAM) was developed for use in the Aeroassist Orbital Transfer Vehicle (AOTV) trajectory and analysis. The model reflects NASA Space Shuttle experience over the first twelve entry flights. The GRAM was selected over the Air Force 1978 Reference Model because of its more general formulation and wider use throughout NASA. The add-on model, a simple scaling with altitude to reflect density structure encountered by the Shuttle Orbiter was selected principally to simplify implementation. Perturbations, by season, can be utilized to minimize the number of required simulations, however, exact Shuttle flight history can be exercised using the same model if desired. Such a perturbation model, though not meteorologically motivated, enables inclusion of High Resolution Accelerometer Package (HiRAP) results in the thermosphere. Provision is made to incorporate differing perturbations during the AOTV entry and exit phases of the aero-asist maneuver to account for trajectory displacement (geographic) along the ground track.

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