{"id":9608,"date":"2026-03-31T15:47:53","date_gmt":"2026-03-31T07:47:53","guid":{"rendered":"https:\/\/ascendas-asia.com\/?page_id=9608"},"modified":"2026-03-31T16:33:28","modified_gmt":"2026-03-31T08:33:28","slug":"tessella-designs-attitude-and-orbit-control-algorithms-for-solar-orbiter-spacecraft-using-model-based-design","status":"publish","type":"page","link":"https:\/\/ascendas-asia.com\/th\/customer-stories\/tessella-designs-attitude-and-orbit-control-algorithms-for-solar-orbiter-spacecraft-using-model-based-design\/","title":{"rendered":"Tessella Designs Attitude and Orbit Control Algorithms for Solar Orbiter Spacecraft Using Model-Based Design"},"content":{"rendered":"<h2 style=\"font-weight: bold; line-height: 1.25; text-align: center;\"><span style=\"font-family: Arial, Helvetica, sans-serif;\">Tessella Designs Attitude and Orbit Control Algorithms for Solar Orbiter Spacecraft Using Model-Based Design<\/span><\/h2>\n<div data-hs-responsive-table=\"true\" style=\"overflow-x: auto; max-width: 100%; width: 99%; margin-left: auto; margin-right: auto; text-align: left; line-height: 1.25;\">\n<table style=\"width: 100%; border-collapse: collapse; table-layout: fixed; border: 0px hidden #99acc2; height: 3329.12px;\">\n<tbody>\n<tr style=\"height: 990.211px;\">\n<td style=\"width: 31.5096%; padding-top: 4px; padding-right: 4px; padding-bottom: 4px; text-align: justify; vertical-align: top; height: 990.211px; border-style: hidden;\">\n<p style=\"text-align: left;\"><span style=\"font-family: Arial, Helvetica, sans-serif;\">&nbsp;\u201cWe saw the benefits of Model-Based Design on several previous projects. On this project, MATLAB and Simulink enabled us to create a detailed specification that minimized deviation between the prototype algorithms we developed, tuned, and tested in Simulink and the final software implementation.\u201d&nbsp; &#8211; <cite>Andrew Pollard, Tessella<\/cite>&nbsp;<\/span><span style=\"font-family: Arial, Helvetica, sans-serif;\"><!--StartFragment--><\/span><\/p>\n<h3 style=\"font-weight: bold;\"><span style=\"font-family: Arial, Helvetica, sans-serif;\">Challenge<\/span><\/h3>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\">Design algorithms for the attitude and orbit control subsystem for the Solar Orbiter spacecraft capable of maintaining pointing stability to within a few tenths of an arcsecond<\/span><span style=\"font-family: Arial, Helvetica, sans-serif;\"><!--StartFragment--><\/span><\/p>\n<h3 style=\"font-weight: bold;\"><span style=\"font-family: Arial, Helvetica, sans-serif;\">Solution<\/span><\/h3>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\">Use Model-Based Design with MATLAB and Simulink to model spacecraft sensors, actuators, and control algorithms; run simulations to optimize and tune the algorithms; and guide the creation of a detailed software specification<!--StartFragment--><\/span><\/p>\n<h3 style=\"font-weight: bold;\"><span style=\"font-family: Arial, Helvetica, sans-serif;\">Result<\/span>&nbsp;<\/h3>\n<p><!--StartFragment--><\/p>\n<ul>\n<li style=\"text-align: left;\">\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\">ECSS compliance demonstrated<!--EndFragment-->&nbsp;<\/span><\/p>\n<\/li>\n<li style=\"text-align: left;\">\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\"><\/span><span style=\"font-family: Arial, Helvetica, sans-serif;\">Complex analysis completed on schedule<\/span><\/p>\n<\/li>\n<li style=\"text-align: left;\">\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\">Models reused on follow-on projects, cutting design effort by up to 80%<\/span><\/p>\n<\/li>\n<\/ul>\n<\/td>\n<td style=\"width: 5.37968%; padding: 4px; text-align: justify; vertical-align: top; height: 990.211px; border-style: hidden;\">&nbsp;<\/td>\n<td style=\"padding: 4px; vertical-align: top; height: 990.211px; border-style: hidden; width: 63.0077%;\" colspan=\"3\">\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\"><img decoding=\"async\" src=\"https:\/\/6377406.fs1.hubspotusercontent-na2.net\/hubfs\/6377406\/solar%20orbiter.jpg\" width=\"600\" height=\"338\" loading=\"lazy\" alt=\"solar orbiter\" style=\"height: auto; max-width: 100%; width: 600px; margin-left: auto; margin-right: auto; display: block;\"><\/span><\/p>\n<p>&nbsp;<\/p>\n<p style=\"font-size: 18px; font-weight: bold; text-align: justify;\"><span style=\"font-family: Arial, Helvetica, sans-serif;\">ZF Friedrichshafen AG creates products The Solar Orbiter mission of the European Space Agency\u2019s Cosmic Vision program is set to answer fundamental questions about the workings of the solar system and the origins of the universe. The Solar Orbiter spacecraft will carry 10 scientific instruments for close-up observation of solar features as well as instruments to perform in-situ measurements. It will travel to within 43 million km of the Sun\u2014closer than Mercury\u2014where it will experience 13 times the intensity of terrestrial sunlight and temperatures of up to 520\u00b0C.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: Arial, Helvetica, sans-serif;\">The attitude and orbit control subsystem (AOCS) will be responsible for keeping the spacecraft and its solar shield oriented toward the sun and for maintaining a precise attitude to maximize the accuracy of the instruments. Under the leadership of the overall mission prime contractor, Airbus Defence &amp; Space, the AOCS is being delivered by a team of Airbus in the U.K., Terma in Denmark, and Tessella in the U.K. and The Netherlands. Airbus is the AOCS prime contractor and AOCS responsible, and Terma is responsible for implementation of the on-board flight software. Tessella is covering the design, preliminary tuning, simulation, and performance assessment for the AOCS algorithms for all the spacecraft modes of operation.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: Arial, Helvetica, sans-serif;\">In support of this work, engineers at Tessella used Model-Based Design with MATLAB<sup>\u00ae<\/sup> and Simulink<sup>\u00ae<\/sup> to develop the AOCS algorithms and create a comprehensive specification for Terma\u2019s AOCS software that met European Cooperation for Space Standardization (ECSS) standards.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"font-family: Arial, Helvetica, sans-serif;\">\u201cThe models we created in Simulink served as a complete prototype of the AOCS software, the spacecraft, and its environment,\u201d says Andrew Pollard, mathematical modeler and algorithm developer at Tessella. \u201cWe used the models extensively to tune algorithms and get an early indication of their performance. Simulations gave us a high degree of confidence in the algorithms, which we then used to create a software specification that was much more detailed than a traditional specification for this type of system.\u201d<\/span><\/p>\n<\/td>\n<\/tr>\n<tr style=\"height: 2338.91px;\">\n<td style=\"padding-top: 4px; padding-right: 4px; padding-bottom: 4px; text-align: justify; vertical-align: top; border-style: hidden; width: 99.8969%; height: 2338.91px;\" colspan=\"5\">\n<h2 style=\"font-weight: bold;\"><span style=\"font-family: Arial, Helvetica, sans-serif;\">Challenge<\/span><\/h2>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\">The AOCS must continuously adjust the Solar Orbiter spacecraft\u2019s attitude so that the solar shield provides maximum protection as the spacecraft passes close to the sun. For safety reasons, the AOCS cannot allow the spacecraft to depoint more than 6.5 degrees from the Sun at any time, even after a failure. During scientific observations, pointing stability must be within a few tenths of an arcsecond.<\/span><\/p>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\">In addition to meeting these requirements, the AOCS had to account for disturbance torques from solar radiation pressure, gravity gradient, and aerodynamic forces.<\/span><\/p>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\">The spacecraft\u2019s physical structure compounded the AOCS design challenge. The solar shield contributed to an unusual mass distribution that made stability a challenge. In addition, multiple flexible appendages\u2014including solar arrays\u2014made the entire structure susceptible to resonance.<\/span><\/p>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\">Tessella engineers would need to design control and estimation algorithms that accounted for all these factors while meeting the performance requirements and ECSS-stated common values for stability margins, as well as accommodating changes to hardware specifications and requirements<\/span><\/p>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\">&nbsp;<!--StartFragment--><\/span><\/p>\n<h2 style=\"font-weight: bold;\"><span style=\"font-family: Arial, Helvetica, sans-serif;\">Solution<\/span><\/h2>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\">Tessella engineers used Model-Based Design to design, model, simulate, and perform preliminary tuning of the algorithms, and prove their suitability for formal coding and verification.<\/span><\/p>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\">Working in Simulink, the team modeled the spacecraft\u2019s actuation systems, including its four reaction wheels and chemical propulsion thrusters. To provide fine-grained control of the thrusters, the team developed and modeled an actuator commanding algorithm using pulse-width modulation.<\/span><\/p>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\">The engineers used Optimization Toolbox\u2122 to optimize this thruster commanding algorithm and minimize propellant consumption while operating within the physical constraints of the thrusters.<\/span><\/p>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\">They modeled the spacecraft dynamics and its approximately 40 flexible modes as a mass-spring-damper system. Using Control System Toolbox\u2122, they created a state-space model that enabled them to quickly determine the frequency response of the system and avoid resonances.<\/span><\/p>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\">The engineers used Signal Processing Toolbox\u2122 to analyze the frequency spectrum of the spacecraft rates. They used the analysis results to avoid frequencies that could excite resonant modes and to design low-pass filters that limited the energy fed into these frequencies.<\/span><\/p>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\">The spacecraft sensors, including the sun sensor, star tracker, and gyroscopes, were modeled in Simulink. The team designed and modeled estimators that calculate the spacecraft\u2019s attitude and angular rates based on the noisy data obtained from these sensors.<\/span><\/p>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\">Continuing to work in Simulink, the team designed and modeled the main AOCS control algorithms. These algorithms generate demands for spacecraft accelerations based on input received from the estimators and the spacecraft\u2019s guidance system while accounting for solar radiation pressure and other disturbances.<\/span><\/p>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\">Using Simulink Check\u2122 and Simulink Coverage\u2122, the team checked compliance with modeling standards and measured model coverage.<\/span><\/p>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\">The engineers used a continuous integration server to automate an extensive suite of unit tests, long-duration simulations, and parameter-sweep analyses in Simulink and MATLAB.<\/span><\/p>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\">Results from the simulations and analyses were used to automatically update data tables and figures in Microsoft<sup>\u00ae<\/sup> Word<sup>\u00ae<\/sup> documents that served as the formal AOCS software specification.<\/span><\/p>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\">The implementation of the AOCS flight software is currently undergoing testing, and is on track to meet the Solar Orbiter mission\u2019s target launch date.<\/span><\/p>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\">&nbsp;<!--StartFragment--><\/span><\/p>\n<h2 style=\"font-weight: bold;\"><span style=\"font-family: Arial, Helvetica, sans-serif;\">Result<\/span><\/h2>\n<ul>\n<li>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\"><strong>ECSS compliance demonstrated. <\/strong>\u201cMathWorks tools helped us greatly in demonstrating compliance with the stability margin requirements of ECSS standards, including ECSS-E-60A,&#8221; says Pollard. \u201cI don\u2019t know of any other platform that offers the features we needed.\u201d<\/span><\/p>\n<\/li>\n<li>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\"><\/span><span style=\"font-family: Arial, Helvetica, sans-serif;\"><strong>Complex analysis completed on schedule.<\/strong> \u201cThe level of analysis required on the AOCS project and the number of challenges that we had to address were much higher than on any previous mission we worked on,\u201d Pollard says. \u201cMATLAB and Simulink were key to enabling us to complete it all on a compressed time scale.\u201d<\/span><\/p>\n<\/li>\n<li>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\"><strong>Models reused on follow-on projects, cutting design effort by up to 80%.<\/strong> \u201cWe are reusing parts of the Simulink model we developed for the Solar Orbiter mission on a project to model complex spacecraft dynamics around small solar system bodies for a UK Space Agency study, again working in collaboration with Airbus,\u201d says Pollard. \u201cWithout model reuse, the project would have taken at least five times more effort, and we probably would not have been able to perform the work within the constraints of the project.&#8221;<\/span><\/p>\n<\/li>\n<\/ul>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\">&gt;&gt; <a href=\"https:\/\/www.capgemini.com\/us-en\/\" rel=\"noopener\" target=\"_blank\">Learn more about Tessella<\/a>&nbsp;<\/span><!--EndFragment-->&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h3 style=\"font-weight: bold;\"><span style=\"font-family: Arial, Helvetica, sans-serif;\">Products Used<\/span><\/h3>\n<ul>\n<li>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\"><a href=\"https:\/\/www.mathworks.com\/products\/control.html\">Control System Toolbox<\/a><\/span><\/p>\n<\/li>\n<li>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\"><a href=\"https:\/\/www.mathworks.com\/products\/optimization.html\">Optimization Toolbox<\/a><\/span><\/p>\n<\/li>\n<li>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\"><a href=\"https:\/\/www.mathworks.com\/products\/requirements-toolbox.html\">Requirements Toolbox<\/a><\/span><\/p>\n<\/li>\n<li>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\"><a href=\"https:\/\/www.mathworks.com\/products\/signal.html\">Signal Processing Toolbox<\/a><\/span><\/p>\n<\/li>\n<li>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\"><a href=\"https:\/\/www.mathworks.com\/products\/simulink-check.html\">Simulink Check<\/a><\/span><\/p>\n<\/li>\n<li>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\"><a href=\"https:\/\/www.mathworks.com\/products\/simulink-coverage.html\">Simulink Coverage<\/a><\/span><\/p>\n<\/li>\n<\/ul>\n<p><!--EndFragment-->&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-family: Arial, Helvetica, sans-serif;\"><span style=\"text-align: center;\"><a class=\"maxbutton-1 maxbutton maxbutton-get-quote\" target=\"_blank\" rel=\"noopener\" href=\"https:\/\/ascendas-asia.com\/th\/contact-us\/\"><span class='mb-text'>Get Quote<\/span><\/a>&nbsp; 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On this project, MATLAB and Simulink enabled us to create a detailed specification that minimized deviation between the prototype algorithms we developed, tuned, and tested in Simulink and the final [&hellip;]<\/p>","protected":false},"author":4,"featured_media":0,"parent":3677,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"content-type":"","footnotes":"","_links_to":"","_links_to_target":""},"class_list":["post-9608","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.1 (Yoast SEO v27.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Tessella Designs Attitude and Orbit Control Algorithms for Solar Orbiter Spacecraft Using Model-Based Design - TechSource Systems &amp; Ascendas Systems Group<\/title>\n<meta name=\"description\" content=\"Tessella, working for mission and AOCS prime contractor Airbus, designed, modeled, simulated, and tuned the attitude and orbit control subsystem algorithms for the ESA\u2019s Solar Orbiter mission.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ascendas-asia.com\/th\/customer-stories\/tessella-designs-attitude-and-orbit-control-algorithms-for-solar-orbiter-spacecraft-using-model-based-design\/\" \/>\n<meta property=\"og:locale\" content=\"th_TH\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tessella Designs Attitude and Orbit Control Algorithms for Solar Orbiter Spacecraft Using Model-Based Design\" \/>\n<meta property=\"og:description\" content=\"Tessella, working for mission and AOCS prime contractor Airbus, designed, modeled, simulated, and tuned the attitude and orbit control subsystem algorithms for the ESA\u2019s Solar Orbiter mission.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/ascendas-asia.com\/th\/customer-stories\/tessella-designs-attitude-and-orbit-control-algorithms-for-solar-orbiter-spacecraft-using-model-based-design\/\" \/>\n<meta property=\"og:site_name\" content=\"TechSource Systems &amp; Ascendas Systems Group\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/techsourcesystems\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-31T08:33:28+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/6377406.fs1.hubspotusercontent-na2.net\/hubfs\/6377406\/solar%20orbiter.jpg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"6 \u0e19\u0e32\u0e17\u0e35\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/ascendas-asia.com\\\/customer-stories\\\/tessella-designs-attitude-and-orbit-control-algorithms-for-solar-orbiter-spacecraft-using-model-based-design\\\/\",\"url\":\"https:\\\/\\\/ascendas-asia.com\\\/customer-stories\\\/tessella-designs-attitude-and-orbit-control-algorithms-for-solar-orbiter-spacecraft-using-model-based-design\\\/\",\"name\":\"Tessella Designs Attitude and Orbit Control Algorithms for Solar Orbiter Spacecraft Using Model-Based Design - 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