ASTOS 8 . 1-MISSION PERFORMANCE ANALYSIS , SYSTEM CONCEPT ANALYSIS AND OTHER NEW FEATURES

This paper presents the main extensions of ASTOS incorporated into release 8.1. First it gives an overview on ASTOS and its workflow, then it presents the new capabilities. Four new major developments have been made for the release 8.1 of ASTOS focusing on new markets and increased usability:  An integrated set of mission performance analysis features that cover almost all aspects required to fill a mission analysis report according to DOPS-GS-RM1002-OPS-OSA.  Models and techniques for system concept analysis considering the power system, thermal control system as well as data management and communication systems  A built-in tool to import CAD models, to easily texturize them and to use them for the built-in animation tool  New wizards that ease the set-up of an ASTOS scenario and that help migrating a scenario from one to another application. The paper details on each of the above mentioned new functionalities, showing user input and results taken from typical example scenarios. 1. ASTOS OVERVIEW AND WORKFLOW With ASTOS it is possible to set up arbitrary space scenarios with multiple vehicles (also constellations), ground stations, areas of interest and points of interest. Each vehicle or station may consist of several elements like sensors, actuators (like thrusters, torquers or wheels), tanks, structural components, batteries, solar generators, radiators, etc. A set of customizable models with various complexity and realism is available for each of the abovementioned categories (model database). The same for environmental models like atmosphere, gravity field, magnetic field, hydrosphere, ephemerides and celestial body spin models. Ones configured, all these models can be reused throughout the scenario (template approach). Via a graphical “Vehicle Builder” a spacecraft or rocket can be built from the defined and configured elements, whereas the element’s aspects like positioning, their role or contribution in the power, thermal control or data management system or their graphical representation (e.g. for animations) can be configured. Via the dynamics configuration, initial states and the translational and rotational motion of each vehicle can be defined (e.g. equations of motion, attitude control laws; 3-dof or 6-dof propagation), whereas motion rules can be changed throughout the simulation time (multi-phase concept). Figure 1: ASTOS scenario overview The further work flow of ASTOS depends on the application: It might consist just of a simulation and results inspection (by means of the built-in plotting and animation tools or using one of the available export filters), but it can be more complex e.g. if the optimization or batch processing feature of ASTOS is used (see Figure 2). Figure 2: ASTOS workflow Several hundred output functions are provided already in a standard ASTOS simulation output file. However, further information can be exploited from the simulation result in post-processing step by means of a variety of available analyses. Such analyses are described below. 2. MISSION PERFORMANCE ANALYSIS The ASTOS software tries to cover all mission performance aspects that can be assessed by means of analysis software. With ASTOS 8.1 these mission performance aspects can be analyzed with ASTOS:  eclipses  fuel budget and operational life-time  end-of-life disposal  ground station coverage  electrical power budget  data management and storage  orbit evolution Since coverage analysis and orbit evolution are covered already by previous releases of ASTOS 8, they are not addressed by this paper. Electrical power budget as well as data management and storage are aspects that are explained in chapter 3. 2.1. Lifetime Prediction The lifetime prediction analysis of ASTOS calculates the fuel consumption due to various maneuvers:  insertion correction