Navigation Links
ESA satellites flying in formation
Date:12/3/2008

eers had to overcome many challenges in order to put Envisat and ERS-2 into a tandem flight configuration. For instance, in 2001 ERS-2 lost the ability to be manoeuvred in the usual way by onboard gyroscopes, navigational tools that allow mission controllers to maintain the correct position of satellites.

The operational lifetime of satellite missions is normally determined by the functioning of onboard gyroscopes. Without them, the ESA team had to work out a way of positioning the spacecraft by operating onboard sensors in a new way.

Part of their creative solution involved using a device called the Digital Earth Sensor (DES), which is designed to provide the horizon line to allow basic checks on the spacecraft's position, and analysing Doppler frequency shifts in the signals of ERS-2's radar instruments.

ERS-2, launched in 1995, and Envisat, launched in 2002, have exceeded the time they were intended to stay in orbit. Since they remain operational and continue to provide quality data about our planet, engineers are trying to use as little fuel as possible so as not to shorten their lifetimes.

"The strategy is to align the tandem start date with an Envisat manoeuvre. Therefore, there is no need to spend extra hydrazine for Envisat. For ERS, the manoeuvre to place it in tandem position is such that the satellite drifts back to its nominal orbit without additional manoeuvre after the tandem campaign," ESA Mission Planner Manager Sergio Vazzana said.


'/>"/>

Contact: Mariangela D'Acunto
mariangela.dacunto@esa.int
39-069-418-0856
European Space Agency
Source:Eurekalert

Page: 1 2

Related biology news :

1. ESA satellites focusing on the Arctic
2. Value of satellites recognized for conserving wetlands
3. Satellites helping aid workers in Honduras
4. Digital cameras, remote satellites measure crop water demand
5. Satellites illuminate pollutions influence on clouds
6. Satellites take sustainability to new heights
7. ASU researchers use NASA satellites to improve pollution modeling
8. Satellites help ensure efficient use of pesticides
9. UNCCD recognizes importance of satellites for combating desertification
10. Satellites witness lowest Arctic ice coverage in history
11. Researchers uncover worlds oldest fossil impression of a flying insect
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/19/2015)... DUBLIN , Feb .19, 2015 Research ... announced the addition of the "Military Electro-Optical ... by Sensor Technology, by Platform - Forecast to ... The military electro-optical/infrared systems market is expected ... a CAGR of 7.71%. This report ...
(Date:2/13/2015)... TAIPEI , Feb. 13, 2015 ... service company that aims to transform cancer genomic ... announced that the company has raised US$ 8 million ... Based in Taipei, Taiwan ... tests, ACTDrug™, ACTOnco™. With the aim to implement ...
(Date:2/12/2015)... -- NXT-ID, Inc. (NASDAQ: NXTD and ... focused on the growing mobile commerce market, announced today ... DISTRIBUTED METHOD AND SYSTEM TO IMPROVE COLLABORATIVE SERVICES ... NXT-ID,s position in the emerging "Internet of Things" by ... multiple devices to collaborate with one another to improve ...
Breaking Biology News(10 mins):Military Electro-Optical / Infrared Systems (Image Intensification, Laser, Infrared) Market - Forecast to 2020: Featuring Profiles of the Market Leaders on this $16 Billion market 2Military Electro-Optical / Infrared Systems (Image Intensification, Laser, Infrared) Market - Forecast to 2020: Featuring Profiles of the Market Leaders on this $16 Billion market 3ACT Genomics Raises $8 Million in its First Private Funding Round 2NXT-ID Patents Collaborative Services to Enable the "Internet of Things" 2NXT-ID Patents Collaborative Services to Enable the "Internet of Things" 3
... foxes, a bubbling vat of chemical reactants, and complex ... similar systems: Many scenarios can play out depending on ... can,t be precisely predicted chemicals combining, genes triggering ... eaten. Predicting possible outcomes from a set of ...
... School of Basic Medical Sciences, Beijing University of ... inhibit advanced glycation end product formation, reduce their ... and memory capabilities in ovariectomized rats. The Radix ... product accumulation is associated with an antioxidative effect. ...
... clean up city parks, or scale back their driving to ... granted and ride free on the efforts of others. They ... it. Or they run their lawn sprinklers during a drought ... A new report in Psychological Science in the ...
Cached Biology News:Computer can infer rules of the forest 2Trust in leaders, sense of belonging stir people to safeguard common goods, analysis shows 2Trust in leaders, sense of belonging stir people to safeguard common goods, analysis shows 3
(Date:3/3/2015)... /CNW/- SQI Diagnostics Inc. (TSX:V: SQD), a life sciences company ... for advanced microarray diagnostics, today announced it has ... Management team. In his capacity as CFO he ... a development stage to a commercially successful company ... capital market strategy and to secure funding to ...
(Date:3/3/2015)... 2015 BlueInGreen announces ... international sales network. The business venture will bring ... Canada’s Atlantic Provinces, exclusively through Resource Systems. , ... of Canada’s premiere manufacturing representative firms, hosting a ... water and wastewater markets. More information on Resource ...
(Date:3/3/2015)...  Regenicin, Inc. (OTC Bulletin Board: RGIN ... and commercialization of regenerative cell therapies to restore the ... it has received the final payment to conclude The ... Bulletin Board: AMBS ). ... payments due to Regenicin in the amount of $2.3 ...
(Date:3/3/2015)... The winners of awards for supply chain ... Global Supply Chain Resiliency Council (GSCRC) at ... February 25th, 2015, at the Hyatt Regency in Santa ... together supply chain risk management and resiliency practitioners with ... through opportunities to collaborate, develop and share best practices, ...
Breaking Biology Technology:SQI Diagnostics Appoints Chief Financial Officer 2SQI Diagnostics Appoints Chief Financial Officer 3BlueInGreen® Continues Canadian Expansion, Partners with Resource Systems Inc. 2Regenicin (RGIN) Receives $2.3 Million in Final Payment from Amarantus 2Regenicin (RGIN) Receives $2.3 Million in Final Payment from Amarantus 3Global Supply Chain Resiliency Council Names Award Winners 2Global Supply Chain Resiliency Council Names Award Winners 3Global Supply Chain Resiliency Council Names Award Winners 4
... Lumen ... ... ANPI , TSX: ANP) today announced that it will introduce and,exhibit ... Radiology (SIR) Annual Scientific Meeting to be,held in Washington, DC from ...
... March 13 ViroPharma Incorporated,(Nasdaq: VPHM ) ... chief operating officer of ViroPharma, will present at ... at 1:40 P.M. ET on Tuesday,March 18, 2008. ... Marriott Copley,Place., ViroPharma,s presentation will be webcast ...
... SLN) today announces a collaboration with AstraZeneca (LSE: ... novel approaches for the delivery,of siRNA molecules. The ... delivery of siRNA molecules, in particular its success,with ... using its,proprietary AtuPLEX technology. The financial details of ...
Cached Biology Technology:Angiotech showcases its Hemostream(TM) Dialysis Catheter at the Society of Interventional Radiology (SIR) Annual Meeting 2Angiotech showcases its Hemostream(TM) Dialysis Catheter at the Society of Interventional Radiology (SIR) Annual Meeting 3Angiotech showcases its Hemostream(TM) Dialysis Catheter at the Society of Interventional Radiology (SIR) Annual Meeting 4Angiotech showcases its Hemostream(TM) Dialysis Catheter at the Society of Interventional Radiology (SIR) Annual Meeting 5Silence Therapeutics and AstraZeneca Announce Collaboration to Develop Novel Approaches for siRNA Drug Delivery 2Silence Therapeutics and AstraZeneca Announce Collaboration to Develop Novel Approaches for siRNA Drug Delivery 3
... a member of the caudal-related homeobox family, ... both proliferation and differentiation in intestinal epithelial ... triggering cells towards the phenotype of differentiated ... maintenance of the phenotype. Clone CDX2-88 reacts ...
... antibody detects an ~185 kDa protein, corresponding ... phosphorylated at tyrosine 1248 on SDS-PAGE immunoblots. ... adsorbed against the non-phosphorylated peptide to remove ... of the protein. In cell lines ...
... G1 cyclin required for G1-phase progression and ... cyclin D2 can phosphorylate pRB when ... Human, Mouse, and Rat. Others-not ... well suited for neutralization of cyclin D2 ...
Mouse Anti-Human Methyl-CpG binding domain protein 2 (MBD2 Monoclonal Antibody Family: Other Applications: Western Blot...
Biology Products: