Jason 3 satellite

Jason-3 is an oceanographic satellite scheduled to be launched aboard Falcon 9 vehicle from the Vandenberg Air Force Base in California, in August 2015. The satellite will monitor Earth’s global ocean, tracking sea-level rise, ocean heat content, as well as the sea-surface height.

The satellite is being developed by the National Oceanic and Atmospheric Administration (NOAA), Jet Propulsion Laboratory of Nasa, France’s Centre Nationale d’Etudes Spatiales (CNES) and the European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT).

The Jason-3 will be positioned at an altitude of 1,336km at 66° orbital position similar to that of Jason-2, which was launched in June 2008.

Jason-3 satellite design and development

Thales Alenia Space was awarded a contract to design and build the Jason-3 satellite in February 2010. The satellite was constructed and assembled at Thales Alenia Space’s facility located in Toulouse. It was shipped to California’s Vandenberg Air Force Base in June 2015, which is currently performing pre-launch operations.

The Jason-3 is designed to serve for three years based on Proteus bus built by CNES / TAS. The satellite will have a launch mass of 553kg including platform dry mass of 277kg, and payload mass of 255kg. It will include 550W of power and will maintain a pointing accuracy of 0.15°.

Jason-3 mission details

"The data obtained from Jason-3 will be used by forecasters to predict annihilating hurricanes and severe weather in advance."

Jason-3 is a part of the satellite series designed to conduct long-term satellite altimetry observations of sea surface across the globe. It will accurately measure the sea-level on Earth to analyse ocean circulation and climate change.

The data obtained from Jason-3 will be used by forecasters to predict annihilating hurricanes and severe weather in advance.

The satellite will be used for forecasting the intensity of hurricanes, surface wave forecasting for offshore operators, as well as predicting the tides and currents for commercial shipping and ship routing. It will also be used for coastal forecasting in response to oil spills and harmful algal blooms, coastal modelling for marine mammal and coral reef research, and El Niño and La Niña forecasting.

The data provided by the satellite will help the NOAA to accurately forecast the intensification of tropical cyclones.

Instruments onboard Jason-3

"The satellite is fitted with Poseidon-3B altimeter, a key instrument that can be used for spaceborne observation programme."

The satellite is fitted with Poseidon-3B altimeter, a key instrument that can be used for spaceborne observation programme. It can map the topography of the sea surface that can be used for computing ocean surface current velocity, as well as to measure ocean wave height and wind speed.

The onboard advanced microwave radiometer-2 (AMR-2) comprises two subsystems including electronics structure assembly (ESA) from JPL and reflector structure assembly (RSA) from ATK Space Systems. The instrument can be used to measure the altimeter signal path delay caused by troposphere water vapour.

The precise orbit determination system (DORIS) DGXX-S instrument supplied by CNES will maintain permanent track of the satellite’s exact attitude in orbit. It will employ a ground network of 60 orbitography beacons on the Earth, which will transmit signals at two frequencies to a receiver aboard the satellite.

The global positioning system payload (GPSP) supplied by NASA will use the global positioning system (GPS) to ascertain the spacecraft position by triangulation. The data obtained from the instrument will be integrated into orbit determination models to continuously track the satellite’s trajectory.

The laser retro-reflector array (LRA) instrument on the spacecraft will act as a target for satellite laser ranging (SLR) measurements performed by ground stations.

Launch vehicle details

The Jason-3 satellite will be launched aboard Falcon 9 v1.0 rocket from Complex 4 at Vandenberg Air Force Base, California. Space Exploration Technologies (SpaceX) was contracted to provide launch services for the Jason-3 satellite in July 2012.