ESA\u2019s HydroGNSS Project Manager, Jean-Pascal Lejault, emphasized the team\u2019s dedication in making this mission a reality: \u201cReaching this milestone is a tremendous achievement, and I am incredibly proud of the entire team behind HydroGNSS. Developing ESA\u2019s first Scout mission within such a tight timeframe and budget has required exceptional dedication and ingenuity. My special thanks go to our prime contractor Surrey Satellite Technology Ltd in the UK and the ESA project team\u2014their commitment and creativity have made HydroGNSS possible.\u201d<\/p>\n
The HydroGNSS mission marks a key step in ESA\u2019s Earth observation program, delivering timely scientific results while keeping costs low. The satellites are designed to move 180 degrees apart in orbit to maximize their coverage, providing a global view of key climate variables. HydroGNSS is part of the FutureEO program, which focuses on agile, cost-effective Earth monitoring solutions.<\/p>\n
What is GNSS Reflectometry? How HydroGNSS Scouts the Water Cycle<\/p>\n
The core technology behind HydroGNSS lies in Global Navigation Satellite System (GNSS) reflectometry, an innovative technique that leverages the signals from satellites like GPS and Galileo. These navigation satellites transmit L-band microwave signals, which change when they bounce off the Earth\u2019s surface. By comparing the reflected signals with direct ones, HydroGNSS can extract valuable geophysical data about our planet\u2019s water cycle.<\/p>\n
This method is particularly useful for monitoring soil moisture, freeze-thaw states, and inundation, as well as for gauging the above-ground biomass of forests. These four key variables are crucial for understanding Earth\u2019s hydrological processes and have significant implications for agriculture, climate change, and flood management. The data collected will help scientists gain a clearer picture of the global water cycle, improving flood prediction models and enhancing agricultural planning.<\/p>\n
![\"Image\"](\"https:\/\/www.newsbeep.com\/au\/wp-content\/uploads\/2025\/11\/image-20.png.webp.webp\")
HydroGNSS\u00a0provides measurements of key hydrological climate variables, including soil moisture, freeze\u2013thaw state over permafrost, inundation and wetlands, and above-ground biomass, using a technique called Global Navigation Satellite System (GNSS) reflectometry. In doing so it complements missions such as ESA\u2019s SMOS and Biomass, Copernicus Sentinel-1 and NASA\u2019s SMAP. The satellite measures the signal reflected off the land, ice and ocean from existing GNSS missions such as Galileo and GPS. Credit: ESA\/ATG medialab<\/p>\n
ESA\u2019s First Scout Mission: A New Era in Small Satellite Science<\/p>\n
HydroGNSS is not only a breakthrough mission in terms of technology but also in the way it was conceived. As ESA\u2019s first Scout mission, it embodies the principles of the \u201cNew Space\u201d movement, which focuses on rapid, cost-effective development. With a mission budget capped at \u20ac35 million and a development cycle of just three years, HydroGNSS exemplifies ESA\u2019s push for agility in space science.<\/p>\n
The Scout program is designed to deliver high-impact scientific missions within tight timeframes and budgets. HydroGNSS, for instance, is set to launch just three years after the project\u2019s inception\u2014a remarkable feat in the world of space missions. As part of ESA\u2019s Earth Observation program, the Scout missions serve as a complement to larger, more complex Earth Explorer missions. Through such innovative and quick-turnaround projects, ESA is reshaping the landscape of Earth observation.<\/p>\n","protected":false},"excerpt":{"rendered":"ESA\u2019s HydroGNSS Scout satellites are set for launch, marking a major milestone in the European Space Agency\u2019s efforts…\n","protected":false},"author":2,"featured_media":271052,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[64,63,128,285],"class_list":{"0":"post-271051","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-space","8":"tag-au","9":"tag-australia","10":"tag-science","11":"tag-space"},"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/posts\/271051","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/comments?post=271051"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/posts\/271051\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/media\/271052"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/media?parent=271051"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/categories?post=271051"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/tags?post=271051"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}