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The Interoperable Global Navigation Satellite Systems Space Service Volume

image of The Interoperable Global Navigation Satellite Systems Space Service Volume

The availability and performance of global navigation satellite systems (GNSS) signals at high altitude is documented as the GNSS Space Service Volume (SSV). While different definitions of the SSV exist and may continue to exist for the different service providers, within the context of this booklet it is defined as the region of space between 3,000 km and 36,000 km above the Earth’s surface, which is the geostationary altitude. For space users located at low altitudes (below 3,000 km), the GNSS signal reception is similar to that for terrestrial users and can be conservatively derived from the results presented for the lower SSV in this booklet.

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Acknowledgements

This booklet was published by the United Nations Office for Outer Space Affairs in its capacity as executive secretariat of ICG and its Providers’ Forum. Sincere thanks to all who have helped, and who recognize the in-space advantages of the SSV specification and provide leadership in developing an SSV specification for the GNSS constellations.

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