Manufacturer |
| ||
---|---|---|---|
Operator | European Space Agency | ||
Applications | Land and sea monitoring, natural disasters mapping, sea ice observations, ships detection | ||
Specifications | |||
Spacecraft type | Satellite | ||
Constellation | Active: 1 | ||
Launch mass | 2,300 kg (5,100 lb) | ||
Dry mass | 2,170 kg (4,780 lb) | ||
Dimensions | 3.9 m × 2.6 m × 2.5 m (13 ft × 8.5 ft × 8.2 ft) | ||
Power | 5.9 kilowatts (5,900 W) [2] | ||
Batteries | 324 Ah | ||
Design life | 7 years | ||
Production | |||
Status | Active | ||
On order | 4 | ||
Built | 4 | ||
Launched | 2 | ||
Operational | 1 | ||
Retired | 1 | ||
Maiden launch | Sentinel-1A (3 April 2014) [3] | ||
Last launch | Sentinel-1B (25 April 2016) | ||
Related spacecraft | |||
Subsatellite of | Copernicus Programme | ||
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Sentinel-1 is the first of the Copernicus Programme satellite constellation conducted by the European Space Agency. [4] This mission was originally composed of a constellation of two satellites, Sentinel-1A and Sentinel-1B, which shared the same orbital plane. Two more satellites, Sentinel-1C and Sentinel-1D are in development. Sentinel-1B has been retired, leaving Sentinel-1A the only satellite of the constellation. The Sentinel-1 satellites carry a C-band synthetic-aperture radar instrument which provides a collection of data in all-weather, day or night. This instrument has a spatial resolution of down to 5 m and a swath of up to 410 km. [5] The satellite orbits a Sun-synchronous, near-polar (98.18° inclination) orbit. The orbit has a 12-day repeat cycle and completes 175 orbits per cycle.
The first satellite, Sentinel-1A, launched on 3 April 2014, and Sentinel-1B was launched on 25 April 2016. Both satellites lifted off from the Guiana Space Centre in Kourou, French Guiana, and each on a Soyuz rocket. [6] Sentinel-1C and 1D are in development. [7] An equipment failure on Sentinel-1B in December 2021 accelerated work on Sentinel-1C, [8] originally planned to launch in December 2023. [9]
There are a wide range of applications for the data collected via the Sentinel-1 mission. A few of these uses include sea and land monitoring, emergency response due to environmental disasters, and economic applications. A major goal of the mission was to provide C-Band SAR data. [10] Recently, Sentinel-1 has worked in conjunction with SMAP to help achieve a more accurate measure of soil moisture estimates. [11] Observations from both instruments show to be complementary of each other as they combine data of soil moisture contents.
The ESA and European Commission's policies makes Sentinel-1's data easily accessible. Various users can acquire the data and use it for public, scientific, or commercial purposes for free.
Sentinel-1 spacecraft are designed to carry the following instruments: [12]
Specifications of the Sentinel-1 satellites: [13]
Sentinel-1 has four operational modes: [13] [14] [15]
Sentinel-1 has four types of data products: [14]
All data levels are publicly available for free online within 24 hours of observation. [16]
Sentinel-1 will provide continuity of data from the ERS and Envisat missions, with further enhancements in terms of revisit, coverage, timeliness and reliability of service.
A summary of the main applications of Sentinel-1 include: [17]
The prime contractor of the mission is Thales Alenia Space Italy, with whole system integration and also with production of platform Spacecraft Management Unit (SMU) and payload Data Storage and Handling Assembly (DSHA). Sentinel-1A was constructed in Rome, Italy. Other technologies such as the T/R modules, the C-band synthetic-aperture radar antenna, the advanced data management and transmission subsystems, and the on-board computer, were developed in L'Aquila and Milan. [20] The C-SAR instrument is the responsibility of Astrium Gmbh.
The ground segment prime contractor is Astrium with subcontractors Telespazio, WERUM, Advanced Computer Systems and Aresys. Final test verification of the satellite was completed at Thales Alenia Space's clean rooms in Rome and Cannes. [20]
Examples of images produced from Sentinel-1 data.
Envisat is a large Earth-observing satellite which has been inactive since 2012. It is still in orbit and considered space debris. Operated by the European Space Agency (ESA), it was the world's largest civilian Earth observation satellite.
European Remote Sensing satellite (ERS) was the European Space Agency's first Earth-observing satellite programme using a polar orbit. It consisted of 2 satellites, ERS-1 and ERS-2.
RADARSAT-2 is a Canadian Space Agency (CSA) Earth observation satellite. It launched on 14 December 2007 aboard a Starsem Soyuz-FG rocket from Baikonur Cosmodrome, Kazakhstan. The spacecraft is owned by MDA
Space-based radar or spaceborne radar is a radar operating in outer space; orbiting radar is a radar in orbit and Earth orbiting radar is a radar in geocentric orbit. A number of Earth-observing satellites, such as RADARSAT, have employed synthetic aperture radar (SAR) to obtain terrain and land-cover information about the Earth.
Japanese Earth Resources Satellite 1 (JERS-1) was a satellite launched in 1992 by the National Space Development Agency of Japan. It carried three instruments:
Seasat was the first Earth-orbiting satellite designed for remote sensing of the Earth's oceans and had on board one of the first spaceborne synthetic-aperture radar (SAR). The mission was designed to demonstrate the feasibility of global satellite monitoring of oceanographic phenomena and to help determine the requirements for an operational ocean remote sensing satellite system. Specific objectives were to collect data on sea-surface winds, sea-surface temperatures, wave heights, internal waves, atmospheric water, sea ice features and ocean topography. Seasat was managed by NASA's Jet Propulsion Laboratory and was launched on 27 June 1978 into a nearly circular 800 km (500 mi) orbit with an inclination of 108°. Seasat operated until 10 October 1978 (UTC), when a massive short circuit in the Agena-D bus electrical system ended the mission.
SAR-Lupe is Germany's first reconnaissance satellite system and is used for military purposes. SAR is an abbreviation for synthetic-aperture radar, and "Lupe" is German for magnifying glass. The SAR-Lupe program consists of five identical (770 kg) satellites, developed by the German aeronautics company OHB-System, which are controlled by a ground station responsible for controlling the system and analysing the retrieved data. A large data archive of images will be kept in a former Cold War bunker belonging to the Kommando Strategische Aufklärung of the Bundeswehr. The total price of the satellites was over 250 million Euro.
Copernicus is the Earth observation component of the European Union Space Programme, managed by the European Commission and implemented in partnership with the EU Member States, the European Space Agency (ESA), the European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT), the European Centre for Medium-Range Weather Forecasts (ECMWF), the Joint Research Centre (JRC), the European Environment Agency (EEA), the European Maritime Safety Agency (EMSA), Frontex, SatCen and Mercator Océan.
Thales Alenia Space is a joint venture between the French technology corporation Thales Group (67%) and Italian defense conglomerate Leonardo (33%). The company is headquartered in Cannes, France.
COSMO-SkyMed is an Earth-observation satellite space-based radar system funded by the Italian Ministry of Research and Ministry of Defence and conducted by the Italian Space Agency (ASI), intended for both military and civilian use. The prime contractor for the spacecraft was Thales Alenia Space. COSMO SkyMed is a constellation of four dual use Intelligence, surveillance, target acquisition, and reconnaissance (ISR) Earth observation satellites with a synthetic-aperture radar (SAR) as main payload, the result of the intuition of Giorgio Perrotta in the early nineties. The synthetic-aperture radar was developed starting in the late nineties with the SAR 2000 program funded by ASI.
SAOCOM is an Earth observation satellite constellation of Argentina's space agency CONAE. Two satellites are already orbiting the Earth in a Sun-synchronous orbit. The second one was launched on 30 August 2020.
Sentinel-2 is an Earth observation mission from the Copernicus Programme that systematically acquires optical imagery at high spatial resolution over land and coastal waters. The mission is currently a constellation with two satellites, Sentinel-2A and Sentinel-2B; a third satellite, Sentinel-2C, is currently undergoing testing in preparation for launch in 2024.
Sentinel-3 is an Earth observation heavy satellite series developed by the European Space Agency as part of the Copernicus Programme. It currently consists of 2 satellites: Sentinel-3A and Sentinel-3B. After initial commissioning, each satellite was handed over to EUMETSAT for the routine operations phase of the mission. Two recurrent satellites— Sentinel-3C and Sentinel-3D— will follow in approximately 2024 and 2028 respectively to ensure continuity of the Sentinel-3 mission.
The Earth and Mission Science Division is a group of European Space Agency (ESA) staff mission scientists, contractors, research fellows, young graduates, trainees, and administrative staff working within the Science, Applications and Climate Department of the Directorate of Earth Observation Programmes. The Division is located at ESA's European Space Research and Technology Centre in Noordwijk, South Holland, The Netherlands.
CryoSat-2 is a European Space Agency (ESA) Earth Explorer Mission that launched on April 8, 2010. CryoSat-2 is dedicated to measuring polar sea ice thickness and monitoring changes in ice sheets. Its primary objective is to measure the thinning of Arctic sea ice, but has applications to other regions and scientific purposes, such as Antarctica and oceanography.
Sentinel-1A is a European radar imaging satellite launched in 2014. It is the first Sentinel-1 satellite launched as part of the European Union's Copernicus programme. The satellite carries a C-band Synthetic Aperture Radar which will provide images in all light and weather conditions. It analyzes many phenomena occurring on Earth, from detecting and tracking oil spills and mapping sea ice to monitoring movement in land surfaces and mapping changes in the way land is used.
Sentinel-1B is a European radar imaging satellite launched on 25 April 2016. It is the second of two original satellites in the Sentinel-1 constellation, part of the European Union's Copernicus programme on Earth observation. The satellite carries a C-SAR sensor, capable of providing high-resolution imagery regardless of weather conditions.
Sentinel-4 is a European Earth observation mission developed to support the European Union Copernicus Programme for monitoring the Earth. It focuses on monitoring of trace gas concentrations and aerosols in the atmosphere to support operational services covering air-quality near-real time applications, air-quality protocol monitoring and climate protocol monitoring. The specific objective of Sentinel-4 is to support this with a high revisit time over Europe.
Biomass is an Earth observing satellite planned for launch by the European Space Agency (ESA) in 2024 on a Vega launch vehicle.
The Sentinel-6 Michael Freilich (S6MF) is a radar altimeter satellite developed in partnership between several European and American organizations. It is part of the Jason satellite series and is named after Michael Freilich. S6MF includes synthetic-aperture radar altimetry techniques to improve ocean topography measurements, in addition to rivers and lakes. The spacecraft entered service in mid 2021 and is expected to operate for 5.5 years.