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首页> 外文期刊>Journal of Spacecraft and Rockets >Mars Phoenix Entry, Descent, and Landing Trajectory and Atmosphere Reconstruction
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Mars Phoenix Entry, Descent, and Landing Trajectory and Atmosphere Reconstruction

机译：火星凤凰号的进入，下降，着陆轨迹和大气重建

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摘要

The details of the trajectory and atmospheric reconstruction for the Mars Phoenix entry, descent, and landing are presented. The trajectory reconstruction used a six-degree-of-freedom process that included integrating the 200 Hz onboard inertial measurement unit incremental velocity change △ V data and incremental angle change △ θ data, the derivatives from the △ V and the. △ θ data, smoothing, and correcting the inertial measurement unit accelerations for physical location on the Lander. Lander orientation angles (angle of attack and sideslip) during descent were reconstructed independently of the aerodynamics and atmosphere models. Before parachute deployment, the angle of attack and sideslip were found to be small (less than 3 deg) leading up to about 5 deg at parachute deploy, where the deployment altitude was determined to be approximately 13 km at a Mach number of about 1.7 and a dynamic pressure of 489 N/m~2. In a separate process, the atmosphere structure (i.e., density, pressure, and temperature) encountered for altitudes up to 80 km was determined. The atmosphere structure determination process involved a detailed aerodynamics model of the Lander and the parachute, as well as accounting for configuration changes during descent Comparisons made with the preflight atmosphere model used in the mission design show good agreement with the three reconstructed atmosphere structure parameters.
机译：给出了火星凤凰号进入，下降和着陆的轨迹和大气重建的详细信息。轨迹重建使用六自由度过程，该过程包括整合200 Hz车载惯性测量单元的增量速度变化△V数据和增量角度变化△θ数据，以及来自△V和的导数。 △θ数据，平滑和校正惯性测量单元在Lander上物理位置的加速度。下降过程中的着陆器定向角（迎角和侧滑角）独立于空气动力学和大气模型进行了重建。在降落伞部署前，发现其迎角和侧滑较小（小于3度），导致在降落伞部署时上升至约5度，在此情况下，马赫数约为1.7时，部署高度约为13公里。动压为489 N / m〜2。在一个单独的过程中，确定了海拔高达80 km时遇到的大气结构（即密度，压力和温度）。大气结构确定过程涉及到Lander和降落伞的详细空气动力学模型，以及下降过程中的构型变化。任务设计中使用的飞行前大气模型进行的比较表明，这与三个重建的大气结构参数具有很好的一致性。

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