![]() The document contains the most up-to-date constellation specifications and descriptions of actual performance for missions on orbit. NASA engineers played a critical role in this milestone, providing technical expertise, encouraging international cooperation, and leading development of this edition of the publication. The new version does exactly that, outlining the specifications of the various GNSS with unprecedented detail. The ICG was founded in 2005 to facilitate compatibility, interoperability, and transparency between GNSS providers. This week, in a major step towards interoperability, the U.N.-sponsored International Committee on GNSS (ICG) published a new edition of their publication, The Interoperable Global Navigation Satellite Systems Space Service Volume. The absence of required documentation for high-altitude spacecraft has made it challenging for navigation engineers and project managers hoping to take advantage of multiple GNSS constellations, which can enhance navigation accuracy and signal availability. These Global Navigation Satellite Systems (GNSS) are each operated by different providers - the U.S., EU, Russia, China, Japan, and India - and have unique designs and characteristics. ![]() Many spacecraft near Earth rely on signals from navigation satellite constellations like GPS. ![]()
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