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Collection Contents
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The Interoperable Global Navigation Satellite Systems Space Service Volume - Second Edition
Global navigation satellite systems (GNSS), which were originally designed to provide positioning, velocity, and timing services for terrestrial users, are now increasingly utilized for autonomous navigation in space as well. Historically, most space users have been located at low altitudes, where GNSS signal reception is similar to that on the ground. More recently, however, users are relying on these signals at high altitudes, near to or above the GNSS constellations themselves. The availability and performance of 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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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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International Space Law
United Nations Instruments
The International Space Law: United Nations Instruments as it represents the most comprehensive and up-to-date volume of instruments that have been developed, promoted and strengthened under the auspices of the United Nations. These instruments constitute the principal body of international space law and will continue to provide, further into the twenty-first century, an effective framework for the expanding and increasingly complex tasks aimed at the exploration and use of outer space for peaceful purposes. May they continue to support humankind’s space activities throughout the years to come.
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International Committee on Global Navigation Satellite Systems (ICG)
The Way Forward - 10 Years of Achievement 2005-2015
The tenth anniversary of the International Committee on Global Navigation Satellite Systems (ICG) brings with it the opportunity to recognize and acknowledge the vital role that satellite technology has played as an innovative tool for sustainable development. The United Nations Office for Outer Space Affairs, as the Executive Secretariat of the ICG, has worked with Member States to enhance the compatibility and interoperability of global navigation satellite systems (GNSS) constellations so that satellite technologies remain equally accessible for all. The ICG demonstrates tangible international cooperation where leading global satellite operators have coordinated their GNSS services to provide global coverage in satellite-based positioning, navigation, and timing, for the benefit of all. As a platform for open discussions and information exchange under the umbrella of the United Nations, the ICG promotes the use of GNSS technology for the management and protection of the environment, disaster risk reduction, agriculture and food security, emergency response, improving the efficiency in surveying and mapping, and to enhance the safety and effectiveness of transportation by land, sea and air.
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