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.



Simulated performance of interoperable space service volume

The Working Group B of the International Committee on GNSS (ICG WG-B), has simulated the GNSS single- and multiple-constellation performance expectations in the SSV, based on the individual constellation signal characteristics documented in chapter 4. As outlined in chapter 3, navigation performance in the SSV is primarily characterized by three properties: user range error (URE), received signal power, and signal availability. The focus of these simulations is on signal availability, which serves as a proxy for navigation capability.


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