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Scheda Articolo Re-Entry Trajectory Optimization for Mission Analysis

 

 

Re-Entry Trajectory Optimization for Mission Analysis<img alt="" src="http://webtest.cira.it/PublishingImages/paper%20GNC-2.jpg" style="BORDER:0px solid;" />https://www.cira.it/en/space/sistemi-di-bordo-per-le-piattaforme-spaziali/gnc2-guida-navigazione-e-controllo/re-entry-trajectory-optimization-for-mission-analysis/Re-Entry Trajectory Optimization for Mission AnalysisRe-Entry Trajectory Optimization for Mission Analysis<p><span style="line-height:107%;font-family:"calibri",sans-serif;font-size:11pt;"><span lang="EN-US"><font color="#000000">In the present work we describe a methodology for the optimization of the re-entry trajectory during the mission analysis phase. The methodology is based on sequential optimization of the AoA and bank angle profile. Specifically, the AoA profile is first optimized to produce a re-entry corridor large enough to ensure the ability to react to off-nominal entry conditions while guaranteeing a downrange capability sufficient to reach the terminal conditions at Terminal Area Energy Management (TAEM) interface. Downrange capability is determined as the difference between the downrange obtained with a minimum value of the bank angle and the downrange obtained with a maximum value of the bank angle. Using the optimized AoA profile, a reference trajectory is then computed inside the obtained re-entry corridor via bank angle profile optimization. This optimization is carried out with the goal of minimizing the distance of the final trajectory point from TAEM interface while ensuring that all mission constraints are satisfied. The advantage of this sequential optimization is to allow designers to plan the reference or nominal AoA profile and explore the capabilities of the vehicle in terms of entry corridor and mission downrange flexibility. The methodology described in this Note is applied to a case study concerning the re-entry mission of the FTB3 vehicle, a winged flying test bed designed by Italian Aerospace Research Center (CIRA) for in-flight validation of enabling technologies for atmospheric re-entry. The results indicate that re-entry corridor optimization allows taking advantage of corridor capabilities thus improving mission flexibility.</font></span></span></p>

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