Mars Phoenix EDL Trajectory and Atmosphere Reconstruction Using NewSTEP

Karlgaard, Christopher D ; Tynis, Jake A

关键词: ATMOSPHERIC DENSITY;    ATMOSPHERIC ENTRY;    DEAD RECKONING;    ENTRY, DESCENT AND LANDING;    HYPERSONIC VEHICLES;    KALMAN FILTERS;    ORBIT DETERMINATION;    RADIO ALTIMETERS;    STATISTICAL ANALYSIS;    REENTRY TRAJECTORIES;    INERTIAL PLATFORMS;   

RP-ID  :  NASA/TM–2019–220282,L-21028,NF1676L-33202

学科分类：天文学(综合)

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

This document describes the trajectory and atmosphere reconstruction of the Mars Phoenix Entry, Descent, and Landing using the New Statistical Trajectory Estimation Program. The approach utilizes a Kalman filter to blend inertial measurement unit data with initial conditions and radar altimetry to obtain the inertial trajectory of the entry vehicle. The nominal aerodynamic database is then used in combination with the sensed accelerations to obtain estimates of the atmosphere-relative state. The reconstructed atmosphere pro le is then blended with pre-flight models to construct an estimate of the as-flown atmosphere.