{"id":16518,"date":"2026-04-16T09:59:07","date_gmt":"2026-04-16T07:59:07","guid":{"rendered":"https:\/\/commercialisation.esa.int\/?p=16518"},"modified":"2026-04-16T10:01:36","modified_gmt":"2026-04-16T08:01:36","slug":"improving-optical-satellite-downlinks-through-intelligent-sky-monitoring","status":"publish","type":"post","link":"https:\/\/commercialisation.esa.int\/?p=16518","title":{"rendered":"Improving Optical Satellite Downlinks Through Intelligent Sky Monitoring"},"content":{"rendered":"<h3>ScaleUp, within ESA\u2019s ACCESS programme, strengthens Europe\u2019s space ecosystem by helping companies bring innovative solutions to market<\/h3>\n<p>Within ScaleUp, the <strong>ESA Technology Brokers<\/strong> promote and support the adoption of a technology into a different market application from which it was originally developed. Successful technology transfers will eventually result in commercial agreements between the technology providers and the product developers. The approach is technology and sector agnostic and covers space to non-space (spin-out) non-space to space (spin-in), and space to space (spin-along).<\/p>\n<p><strong>VISTA<\/strong> is an example of <strong>how ESA Technology Brokers support the transfer of cutting\u2011edge technology into operational space applications<\/strong>.<\/p>\n<p>As satellites orbit Earth, they are generating high volumes of data. High-resolution imaging, environmental monitoring and scientific missions are pushing onboard storage systems and downlink capacity. The challenge is no longer just collecting data: it is getting that data back to Earth <strong>quickly<\/strong> and <strong>reliably<\/strong>.<\/p>\n<p>Free-space optical communication (FSOC), often referred to as laser communication, offers a powerful solution. By transmitting data via laser beams instead of radio waves, satellites can achieve higher data rates. However, optical links demand a perfectly clear line of sight. Even thin or short-lived cloud cover can interrupt transmission and cause failed downlink attempts.<\/p>\n<p>Unlike radio-frequency systems, optical ground stations cannot \u201csee through\u201d clouds. And while weather forecasts provide general guidance, they are not designed for minute-by-minute operational decisions. As optical networks expand, operators need far more precise information: Will the sky be clear when the satellite passes overhead and, if not, when will it be?<\/p>\n<p>This is where <strong>Visual Imaging for Satellite Transmission Assistance (VISTA)<\/strong>, a project developed by <strong>Austrian Wematics<\/strong> with the technical and financial support from the Austrian ESA Technology Broker, steps in.<\/p>\n<h2>From Solar Forecasting to Space Communications<\/h2>\n<p>VISTA builds on atmospheric monitoring technology originally developed for solar-energy nowcasting. In solar power generation, predicting short-term cloud movement is essential for stabilising electricity grids. The same principle can be transferred to optical satellite links.<\/p>\n<p>The system uses dual-modality all-sky imaging units combining visible and thermal infrared sensing. Together, they monitor the full sky hemisphere continuously, during both day and night. By analysing cloud structures and their movement, machine-learning algorithms generate short-term forecasts tailored to optical communication operations.<\/p>\n<p>Instead of general weather information, VISTA produces operationally relevant outputs: the probability of cloud obstruction along a satellite\u2019s path, expected clear transmission windows, and machine-readable forecasts that can feed directly into automated scheduling systems to optimise station selection and pass planning.<\/p>\n<p>In short, it transforms atmospheric observation into actionable decision support.<\/p>\n<p><a href=\"https:\/\/commercialisation.esa.int\/wp-content\/uploads\/2026\/04\/VISTA-Picture1-e1776325307421.png\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-16519 aligncenter\" src=\"https:\/\/commercialisation.esa.int\/wp-content\/uploads\/2026\/04\/VISTA-Picture1-e1776325307421.png\" alt=\"\" width=\"1000\" height=\"349\" \/><\/a><\/p>\n<p style=\"text-align: center;\"><span style=\"font-size: 10pt;\"><em>DualCamera VIS+TIR<\/em><\/span><\/p>\n<h2>Testing Under Real Operational Conditions<\/h2>\n<p>To validate the concept, multiple dual-camera systems were deployed across European test locations. A key installation took place at the <strong>Laser Ground Station Trauen (LaBoT)<\/strong> operated by the <strong>German Aerospace Centre (DLR)<\/strong>.<\/p>\n<p>LaBoT is an automated optical ground station designed for real-world laser communication experiments. Located at the DLR site in Trauen, it forms part of the <strong>Responsive Space Cluster Competence Centre (RSC\u00b3)<\/strong>, which focuses on resilient and rapidly deployable space infrastructures.<\/p>\n<p>Operating in this environment allowed the Wematics team to align measurements with genuine FSOC scenarios. Continuous observation campaigns generated dedicated datasets reflecting the specific atmospheric conditions relevant to optical links. A forecasting pipeline capable of producing nowcasts with approximately 15-minute lead times was implemented and made accessible via an API, enabling integration into ground-station workflows.<\/p>\n<p><a href=\"https:\/\/commercialisation.esa.int\/wp-content\/uploads\/2026\/04\/VISTA-Picture2-e1776325433431.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-16521 aligncenter\" src=\"https:\/\/commercialisation.esa.int\/wp-content\/uploads\/2026\/04\/VISTA-Picture2-e1776325433431.jpg\" alt=\"\" width=\"1060\" height=\"580\" \/><\/a><\/p>\n<p style=\"text-align: center;\"><span style=\"font-size: 10pt;\"><em>Frame Prediction and CFLOS Evaluation<\/em><\/span><\/p>\n<h2>Predicting the Sky Before the Satellite Arrives<\/h2>\n<p>The results demonstrate that<strong> localised sky monitoring combined with short-term nowcasting can significantly improve situational awareness for optical communications<\/strong>.<\/p>\n<p>VISTA predicts cloud motion and overlays satellite trajectory projections within all-sky imagery to evaluate whether a clear field of line of sight (CFLOS), cloud-free visibility along the link path, will exist during the pass. This enables operators to anticipate interruptions before transmission begins.<\/p>\n<p>The project achieved continuous monitoring of FSOC-relevant atmospheric conditions, reliable detection and tracking of cloud formations, and short-horizon forecasting suitable for operational scheduling. Testing within an optical ground-station environment confirmed that satellite path projection in all-sky imagery is robust. The primary technical challenge remains minute-scale forecasting of rapidly evolving cloud structures with sufficient confidence for operations; an area of ongoing refinement.<\/p>\n<h2>A Step Towards Cloud-Aware Infrastructure<\/h2>\n<p>VISTA introduces the concept of cloud-aware optical ground stations. By forecasting link availability in advance, operators can reduce failed transmission attempts and optimise downlink scheduling. The result is more efficient use of optical infrastructure and faster data offloading from low-Earth-orbit satellites.<\/p>\n<p>As data volumes continue to grow, intelligent ground-segment solutions become just as important as advances in space hardware. VISTA demonstrates how technology transfer, in this case from renewable-energy forecasting to space communications, can unlock new operational capabilities.<\/p>\n<h2>Looking Ahead<\/h2>\n<p>Future development will focus on expanding datasets across seasons and climate zones, refining probabilistic forecasting models, and deepening integration with automated satellite scheduling systems.<\/p>\n<p>\u201cESA\u2019s technology transfer enables Austrian companies to bring their innovations into the space domain and create real industrial impact. VISTA demonstrates how this approach strengthens Europe\u2019s position in advanced space communication systems.\u201d says <strong>Susanne Katzler-Fuchs<\/strong>, <strong>ESA Technology Transfer Broker Austria<\/strong>.<\/p>\n<p>&#8220;VISTA was an exciting opportunity for Wematics to explore the use of LWIR sky cameras for continuous day-and-night cloud monitoring in optical satellite communications. We are grateful to have been part of the project and look forward to further contributing to hyperlocal sky observation in support of the future European optical ground-station network.&#8221; States <strong>Paul Matteschk<\/strong> from <strong>Wematics<\/strong>.<\/p>\n<p>As optical communication networks scale up, reliable prediction of atmospheric conditions will become a cornerstone of resilient space infrastructure. By bringing intelligence to the ground segment, VISTA helps ensure that when satellites are ready to transmit, ground stations have the best possible estimate of link readiness.<\/p>\n<p>The Austrian ESA Technology Broker is funded by the <strong>Austrian Research Promotion Agency<\/strong> as part of ScaleUp within the ACCESS Programme.<\/p>\n<a href=\"https:\/\/commercialisation.esa.int\/technology-broker\/\" target=\"_blank\" class=\"btn btn btn-outline-secondary ms-0\">Read more on ESA Technology Brokers<\/a>\n","protected":false},"excerpt":{"rendered":"<p>ScaleUp, within ESA\u2019s ACCESS programme, strengthens Europe\u2019s space ecosystem by helping companies bring innovative solutions to market Within ScaleUp, the ESA Technology Brokers promote and support the adoption of a [&hellip;]<\/p>\n","protected":false},"author":23,"featured_media":16519,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[250],"tags":[430,814,882,485,778,255],"directorate":[431],"sts-api_categories":[],"esa-fields":[],"class_list":["post-16518","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-stories","tag-access","tag-esa-technology-broker","tag-free-space-optical-communication","tag-ground-segment","tag-optical-communication","tag-scaleup","directorate-commercialisation-competitiveness-support"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - 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