Envisat

Envisat
abrev · Public domain · source
Name	Envisat
Mission type	Earth observation
Operator	European Space Agency

Envisat was a major European Space Agency Earth observation satellite, launched on March 1, 2002, from the Guiana Space Centre in French Guiana using an Ariane 5 rocket, and operated until its unexpected loss of contact on April 8, 2012. The satellite was designed to provide Earth observation data for a wide range of applications, including climate change research, oceanography, and land use management, in collaboration with organizations such as the National Oceanic and Atmospheric Administration and the United Nations Environment Programme. Envisat was the largest civilian Earth observation satellite ever launched, with a mass of over 8 tons and a payload of 10 instruments, including the Advanced Synthetic Aperture Radar and the Medium Resolution Imaging Spectrometer, developed in partnership with Thales Alenia Space and EADS Astrium. The satellite played a critical role in supporting the work of NASA, the National Snow and Ice Data Center, and the Intergovernmental Panel on Climate Change.

Introduction

Envisat was a key component of the European Space Agency's Earth Observation program, which aimed to provide a comprehensive understanding of the Earth's system and its response to climate change, in collaboration with the World Meteorological Organization and the International Council for Science. The satellite was designed to build on the success of earlier Earth observation missions, such as ERS-1 and ERS-2, and to provide a new generation of Earth observation data for a wide range of applications, including agriculture, forestry, and disaster management, with support from organizations such as the Food and Agriculture Organization and the United Nations Office for Disaster Risk Reduction. Envisat was also designed to support the work of the Group on Earth Observations and the Committee on Earth Observation Satellites, and to contribute to the development of the Global Earth Observation System of Systems. The satellite's data was used by researchers at institutions such as the University of Cambridge, the University of Oxford, and the Massachusetts Institute of Technology.

Spacecraft Design

The Envisat spacecraft was designed and built by EADS Astrium, with a launch mass of over 8 tons and a payload of 10 instruments, including the Radar Altimeter and the Scanning Imaging Absorption Spectrometer for Atmospheric Cartography, developed in partnership with Thales Alenia Space and the German Aerospace Center. The satellite was equipped with a solar array and a lithium-ion battery, and was designed to operate in a sun-synchronous orbit at an altitude of around 800 km, with support from the European Space Operations Centre and the Guiana Space Centre. The spacecraft was also equipped with a data transmission system capable of transmitting data to the European Space Agency's Earth Observation ground stations, including the Fucino Space Centre and the Vilspa station. The satellite's design was influenced by the work of NASA's Earth Observing System and the Canadian Space Agency's RADARSAT program.

Mission Objectives

The primary mission objectives of Envisat were to provide Earth observation data for a wide range of applications, including climate change research, oceanography, and land use management, in collaboration with organizations such as the Intergovernmental Oceanographic Commission and the Food and Agriculture Organization. The satellite was designed to provide a comprehensive understanding of the Earth's system and its response to climate change, and to support the development of climate models and prediction systems, with support from the World Climate Research Programme and the International Association of Meteorology and Atmospheric Sciences. Envisat was also designed to support the work of the United Nations Framework Convention on Climate Change and the Kyoto Protocol, and to contribute to the development of the Sustainable Development Goals. The satellite's data was used by researchers at institutions such as the University of California, Berkeley, the University of Chicago, and the Columbia University.

Launch and Operation

Envisat was launched on March 1, 2002, from the Guiana Space Centre in French Guiana using an Ariane 5 rocket, and operated until its unexpected loss of contact on April 8, 2012. The satellite was designed to operate in a sun-synchronous orbit at an altitude of around 800 km, with a repeat cycle of 35 days, and was controlled by the European Space Agency's Earth Observation ground stations, including the European Space Operations Centre and the Fucino Space Centre. During its operational lifetime, Envisat provided a vast amount of Earth observation data, which was used by researchers and scientists around the world, including those at NASA, the National Oceanic and Atmospheric Administration, and the University of Tokyo. The satellite's data was also used to support the work of the International Charter on Space and Major Disasters and the Sentinel Asia initiative.

Scientific Instruments

Envisat was equipped with a payload of 10 instruments, including the Advanced Synthetic Aperture Radar, the Medium Resolution Imaging Spectrometer, and the Radar Altimeter, developed in partnership with Thales Alenia Space, EADS Astrium, and the German Aerospace Center. The satellite's instruments were designed to provide a wide range of Earth observation data, including synthetic aperture radar images, multispectral and hyperspectral images, and altimetry data, which were used to support the work of researchers at institutions such as the University of Cambridge, the University of Oxford, and the Massachusetts Institute of Technology. The satellite's instruments were also designed to support the development of climate models and prediction systems, with support from the World Climate Research Programme and the International Association of Meteorology and Atmospheric Sciences.

Legacy and Impact

Envisat has had a significant impact on our understanding of the Earth's system and its response to climate change, and has provided a vast amount of Earth observation data for a wide range of applications, including agriculture, forestry, and disaster management, with support from organizations such as the Food and Agriculture Organization and the United Nations Office for Disaster Risk Reduction. The satellite's data has been used by researchers and scientists around the world, including those at NASA, the National Oceanic and Atmospheric Administration, and the University of Tokyo, and has contributed to the development of the Global Earth Observation System of Systems and the Sustainable Development Goals. Envisat's legacy continues to be felt, with its data and instruments continuing to support Earth observation research and applications, and its mission objectives and achievements serving as a model for future Earth observation missions, such as the Sentinel-1 and Sentinel-2 missions, developed by the European Space Agency and the European Commission. The satellite's impact has also been recognized by the International Astronautical Federation and the Committee on Space Research. Category:Earth observation satellites