Connect with us

(10 December 2020 – ESA) Launched less than three weeks ago, the Copernicus Sentinel-6 Michael Freilich satellite has not only returned its first data, but results also show that it is functioning far better than expected.

Thanks to its new, sophisticated, altimetry technology, Sentinel-6 is poised to deliver exceptionally precise data on sea-level height to monitor the worrying trend of sea-level rise.

Sentinel-6 Michael Freilich was lofted into orbit on 21 November from California. After it had sent back its first signal showing that it was alive and well in space, ESA’s Operations Centre in Germany took care of the satellite’s first few days in orbit before handing it over to Eumetsat for commissioning, and eventual routine operations and distribution of data.

The satellite carries Europe’s latest radar altimetry technology to extend the long-term record of sea-surface height measurements that began in the early 1990s.

On 30 November, flight operators switched on Sentinel-6’s Poseidon-4 altimeter instrument, which was developed by ESA. Analysing its initial data, specialists were astonished by the quality. These first data were presented today, by way of three main images, at the European Space Week.

First sea-level height results from Copernicus Sentinel-6 (contains modified Copernicus Sentinel data (2020), processed by Eumetsat)

The first image shows some preliminary results of sea-surface height. The data are overlaid on a map showing similar products from all of the Copernicus altimetry missions: Jason-3, Sentinel-3A and Sentinel-3B. The background image is a map of sea-level anomalies from satellite altimeter data provided by the Copernicus Marine Environment Monitoring Service for 4 December 2020. The Sentinel-6 data products were generated on 5 December.

The image below shows a comparison between data processed on board the satellite and downlinked (blue line), compared to full raw data processed on the ground (red line). By removing the trailing edge of the data before being transmitted to Earth, the data rate is reduced by 50%. High fidelity low-noise data are thanks to Sentinel-6’s Poseidon-4 digital instrument architecture, which is a first.

sea 2

Copernicus Sentinel-6 first waveform results (contains modified Copernicus Sentinel data (2020), processed by ESA/isardSAT)

ESA’s mission scientist for Copernicus Sentinel-6, Craig Donlon, explained, “We can already see that the satellite is delivering incredible data, thanks to the digital architecture of Posiedon-4 and the inclusion of simultaneous high-resolution synthetic aperture radar processing and conventional low-resolution mode into altimetry for the first time. This gives us the opportunity to make measurements with much finer synthetic aperture radar techniques that can be compared to Jason-3 to understand the improvement of the climate record.”

“Importantly, we can also see that there is very little noise in the data, so we have extremely clean data to work with.”

Director of ESA’s Earth Observation Programmes, Josef Aschbacher, said, “We are delighted with these first results and proud to see our ESA-developed radar altimeter is working so well. Nevertheless, Copernicus Sentinel-6 is a mission that has been built in cooperation with the European Commission, Eumetsat, NASA, NOAA and CNES – with all parties playing essential roles that make this mission the success we are seeing today.”

Another surprising result suggests that the satellites position in space can be better understood than previously thought. A radar altimeter derives the height of the satellite above Earth by measuring how long a transmitted radar pulse takes to reflect from Earth’s surface. Sentinel-6 therefore carries a package of positioning instruments, including a system that can make use of both GPS and Galileo signals. Remarkably, the addition of Galileo measurements brings an improvement in orbit determination quality – which adds to the overall performance of the mission.

More about Copernicus Sentinel-6

Rising seas are at the top of the list of major concerns linked to climate change. Monitoring sea-surface height is critical to understanding the changes taking place so that decision-makers have the evidence to implement appropriate policies to help curb climate change and so that authorities can take action to protect vulnerable communities.

The first sea-surface height ‘reference’ measurements were supplied by the French–US Topex-Poseidon satellite, which was followed by three successive Jason missions. They show that since 1993 the global sea level has risen, on average, by just over 3 mm every year. Even more worryingly, over the last few years the global ocean has risen, on average, by 4.8 mm a year.

While the Copernicus Sentinel-6’s role is to continue this legacy of critical measurements, the satellite carries new digital altimeter technology with dedicated onboard processing that will return even more precise measurements of the height of the sea surface.

Sentinel-6 brings, for the first time, synthetic aperture radar into the altimetry reference mission time series. To ensure that the multi-satellite data time series remains stable, Sentinel-6 delivers simultaneous conventional low-resolution mode measurements, that are similar to measurements from Jason-3, as well as the improved performance of the synthetic aperture radar processing that yields high-resolution along-track measurements. A 12-month tandem flight, where Sentinel-6 flies just 30 seconds behind Jason-3, will be used to compare measurements from the two independent satellites in order to extend the sea-level climate record with confidence.

Source link

0

Space

Exolaunch delivers 30 small satellites into orbit on SpaceX’s first dedicated Rideshare launch

Exolaunch delivers 30 small satellites into orbit on SpaceXs first

(24 January 2021 – Exolaunch) Exolaunch has announced a successful launch of 30 commercial, space agency, and university satellites for its customers from Europe and the U.S. on the first dedicated rideshare mission of SpaceX’s SmallSat Rideshare Program.

The mission, named “Zeitgeist,” lifted off on January 24 at 15:00 UTC on Falcon 9 “Transporter-1,” completing one of the largest and most diverse rideshare missions for Exolaunch.

Falcon 9 liftoff (courtesy: Exolaunch)

Zeitgeist kicked-off the first of several rideshares Exolaunch will manifest on Falcon 9 as part of a multi-launch agreement with SpaceX. On this mission, Exolaunch provided deployment, mission management and integration services to the German Aerospace Center (DLR), Dresden Technical University, ICEYE, NanoAvionics and other commercial companies for IoT, Earth observation and scientific applications.

“This Zeitgeist mission set a new standard for rideshare launches and not only was a successful demonstration of Exolaunch’s capabilities, but also paved the way for smallsat developers from around the world to participate in SpaceX’s SmallSat Rideshare Program,” said Jeanne Medvedeva, Vice President of Launch Services at Exolaunch. “We are proud to be working with so many of the world’s leading satellite and technology companies to advance the NewSpace industry, and we are already looking ahead to additional Falcon 9 launches later this year.”

Zeitgeist was Exolaunch’s 12th rideshare mission. As with previous launches, Exolaunch utilized its proprietary flight-proven separation systems – CarboNIX, the next generation shock-free separation system for microsatellites, upgraded modifications of EXOpod cubesat deployers, as well as its EXObox sequencers to flawlessly deploy its customers’ satellites into the target orbit. With this launch, Exolaunch has flown 140 smallsats on multiple launch vehicles.

Exolaunch’s manifest on the Transporter-1 mission includes the following satellites:

  • Charlie nanosatellite built by NanoAvionics for Aurora Insight: The first of two nanosatellites, built and integrated by NanoAvionics for US radio frequency spectrum and wireless data provider Aurora Insight.
  • CubeLCT nanosatellite from the German Aerospace Center (DLR): The CubeLCT is developed by DLR Institute of Communications and Navigation in close cooperation with its commercialization partner Tesat-Spacecom (TESAT) in Backnang. The satellite has been developed and integrated by the Danish company GomSpace. The development of the CubeLCT serves the demand for increasing bandwidth, resulting in new sensor capabilities on small satellites.
  • SOMP-IIb (Student’s Oxygen Measurement Project) nanosatellite from Dresden Technical University: Part of a student small satellite project of the Dresden Technical University, the goal is to measure atomic oxygen of the upper atmosphere, test flexible solar cells and more.
  • 3 x ICEYE satellites: Three more satellites of the commercial constellation of radar imaging satellites built and operated by ICEYE.
  • 24 satellites from unnamed commercial customers.
  • Exolaunch continues to make space more accessible through regular and cost-efficient rideshare missions for small satellites. In addition to successful satellite deployments from SpaceX’s Falcon 9, Exolaunch’s flight heritage includes Arianespace’s Soyuz-ST, RocketLab’s Electron, Roscosmos’ Soyuz-2 and a scheduled mission with ISRO’s PSLV later this year.

About Exolaunch

Exolaunch provides rideshare launch and deployment services for NewSpace companies. Its flight heritage includes the successful deployment of 140 small satellites into orbit through its global network of launch vehicle providers. Exolaunch enables the visions of New Space leaders, the world’s most innovative startups, research institutions, government organizations, and space agencies. The company also manufactures flight-proven separation systems to deliver the best-in-class integration services and deployment for small satellites.

Source link

0
Continue Reading

Space

Northrop Grumman completes validation test of new rocket motor for United Launch Alliance

Northrop Grumman completes validation test of new rocket motor for

(21 January 2021 – Northrop Grumman) Northrop Grumman conducted a validation ground test of an extended length 63-inch-diameter Graphite Epoxy Motor (GEM 63XL) today in Promontory.

This variation of the company’s GEM 63 strap-on booster was developed in partnership with United Launch Alliance (ULA) to provide additional lift capability to the Vulcan Centaur rocket.

Northrop Grumman conducted a validation test of its GEM 63XL rocket motor on Jan. 21 at its Promontory, Utah, facility. The GEM 63XL will support the United Launch Alliance’s Vulcan Centaur launch vehicle. (courtesy: Northrop Grumman)

“This new motor optimizes our best-in-class technologies and leverages flight-proven solid rocket propulsion designs to provide our customers with the most reliable product,” said Charlie Precourt, vice president, propulsion systems, Northrop Grumman. “Evolving the original GEM 63 design utilizes our decades of GEM strap-on booster expertise while enhancing capabilities for heavy-lift missions.”

During today’s static test, the motor fired for approximately 90 seconds, producing nearly 449,000 pounds of thrust to validate the performance capability of the motor design. Additionally, this firing verified the motor’s internal insulation, propellant grain, ballistics and nozzle in a hot-conditioned environment.

Northrop Grumman has supplied rocket propulsion to ULA and its heritage companies for a variety of launch vehicles since 1964. The GEM family of strap-on motors was developed starting in the early 1980s with the GEM 40 to support the Delta II launch vehicle. The company then followed with the GEM 46 for the Delta II Heavy, and the GEM 60, which flew 86 motors over 26 Delta IV launches before retiring in 2019. The first GEM 63 motors supported ULA’s Atlas V rocket in November 2020.

Northrop Grumman solves the toughest problems in space, aeronautics, defense and cyberspace to meet the ever evolving needs of our customers worldwide. Our 90,000 employees define possible every day using science, technology and engineering to create and deliver advanced systems, products and services.

Source link

0
Continue Reading

Space

SSC and Airbus Defence and Space Netherlands to collaborate in optical communication

SSC and Airbus Defence and Space Netherlands to collaborate in

(21 January 2021 – SSC) SSC and Airbus Defence and Space Netherlands (Airbus DS NL) have signed an MOU for collaborative activities regarding ground equipment for space-to-ground optical communication.

The agreement will accelerate the development of commercially viable optical ground stations that will be offered by Airbus DS NL and used by SSC in delivering ground network services.

One of the collaborative activities in developing this capability includes optical communication tests against the CubeLCT optical terminal on the Photo Images Cross Laser (PIXL-1) Mission, organised in close co-operation with project partner TESAT. PIXL-1 will be launched the 22nd of January.

“Airbus Netherlands will be an important partner as SSC continues to add optical communication solutions to our global network of ground stations. Their modern infrastructure and industry-leading knowledge will be a vital contribution to our service offering”, says Stefan Gardefjord, CEO at SSC.

Optical communication between ground stations and satellites in orbit enables broadband connectivity via space, providing a secure and efficient solution for the fast-growing worldwide demand for data.

“Optical communication will be a game changer in this era in which we increasingly share data. We have a strong desire to work with Swedish Space Corporation to further build up our capabilities for optical ground stations, as they have been at the forefront of ground stations services for decades”, says Maarten Schippers, CEO at Airbus Defence and Space Netherlands.

Source link

0
Continue Reading

Trending