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:12/17/2014)... 15, 2014 The Defense Logistics Agency is insourcing ... prevent counterfeit microcircuits from entering into its supply chain. ... microcircuit anti-counterfeit initiative dubbed DNA marking. The capability will ... reliability throughout the supply chain. The new quality control ...
(Date:12/15/2014)... , Dec. 12, 2014 Research and Markets ... the "Global Facial Recognition Market 2015-2019" report ... Facial recognition is a technology used ... the overall facial feature of a person such as ...
(Date:12/10/2014)... NEW YORK , Dec. 8, 2014 You,ve been here ... but can,t remember your password, site key or the answer to ... grade teacher? Today, Hoyos Labs , a ... finally put an end to the frustration that comes with usernames, ...
Breaking Biology News(10 mins):Defense Logistics Agency Launches DNA Marking Capability to Strengthen Microcircuit Supply Chain 2Defense Logistics Agency Launches DNA Marking Capability to Strengthen Microcircuit Supply Chain 3Global Facial Recognition Market 2015-2019: Key Vendors are 3M Cogent, Cognitec Systems, NEC and Safran Group 2Global Facial Recognition Market 2015-2019: Key Vendors are 3M Cogent, Cognitec Systems, NEC and Safran Group 3The Password is Finally Dead: Launch of 1U Mobile App Eliminates Need for All Usernames and Passwords 2The Password is Finally Dead: Launch of 1U Mobile App Eliminates Need for All Usernames and Passwords 3
... cancer patients unnecessarily undergo surgery or harsh treatments ... slow-growing and aggressive forms of the disease. Researchers ... Medical Institutes are developing technology that allows patients ... relatively mild treatments or take drastic measures. ...
... with autologous cord blood. Following a cardiac arrest with ... been in a persistent vegetative state with minimal ... the cord blood containing stem cells, the symptoms improved ... speak simple sentences and to move. "Our findings, along ...
... Frontiers, one of the world,s largest and fastest growing ... Frontiers in Bioengineering and Biotechnology . ... in Bioengineering and Biotechnology will provide a single ... research to be disseminated and discussed. ...
Cached Biology News:Using big data to identify prostate cancers and best treatments 2Using big data to identify prostate cancers and best treatments 3First successful treatment of pediatric cerebral palsy with autologous cord blood 2Frontiers launches new open-access journal in Bioengineering and Biotechnology 2
(Date:1/22/2015)... Crystal Diagnostics (CDx) Xpress System, a rapid ... AOAC-PTM Certifications for the six non-O157 Shiga toxin-producing E. coli ... to as STEC or the “Big-6”) as well as Escherichia ... per 325 g of raw ground beef and raw beef ...
(Date:1/22/2015)... (PRWEB) January 22, 2015 zFlo Motion ... pleased to announce an exciting product from a new partner. ... analysis solutions over the past 15 years, with offerings in ... recently, their 3D IMU system (inertial measurement unit), iSen, is ...
(Date:1/22/2015)... 22, 2015 Controlled Substance Compliance Services ... helps companies check the legal requirements around using controlled ... China. , As their international operations expand and ... software solutions built as a result of the first ...
(Date:1/22/2015)... Diagenode, Inc., a leading global ... and complete solutions for epigenetics research, recently launched ... the need for manual processing. The new ChIPettor ... of histones or transcription factors and a semi-automated ...
Breaking Biology Technology:Crystal Diagnostics Awarded AOAC-PTM Accreditation for the Rapid Detection of “Big 6” E.coli Food Pathogens 23D Motion Capture Just Got Easy 2Global Compliance Service for Controlled Substances to Expand to China 2Diagenode Launches Unique Semi-Automated Solution for Chromatin Immunoprecipitation 2
...  Halozyme Therapeutics, Inc. (NASDAQ: HALO) will be presenting at ... Francisco on Wednesday, January 11, 2012 at 2:00 p.m. ... Frost, Ph.D., president and chief executive officer of Halozyme ... http://photos.prnewswire.com/prnh/20100302/LA63139LOGO ) The presentation will be ...
... RANCHO CORDOVA, Calif., Jan. 4, 2012 ThermoGenesis Corp. (NASDAQ: ... process and store adult stem cells, said today that India,s ... the Company to initiate commercial sales of the product in ... cells from cord blood. "We are pleased to ...
... Jan. 4, 2012  Today, the Global Probiotics Council (GPC), ... LTD., announced the launch of the fifth annual Young ... two awards, each in the amount of $50,000, to ... to focus on the role of probiotics and gastrointestinal ...
Cached Biology Technology:ThermoGenesis Announces Approval of AXP® by India Ministry of Health 2ThermoGenesis Announces Approval of AXP® by India Ministry of Health 3Fifth Cycle of Probiotics & Microbiota Research Grant Announced 2Fifth Cycle of Probiotics & Microbiota Research Grant Announced 3Fifth Cycle of Probiotics & Microbiota Research Grant Announced 4
... The Label IT siRNA Tracker Intracellular Localization ... directly label and deliver siRNA, of your ... for in vitro tracking experiments. Subcellular localization ... can be monitored following introduction of the ...
... Invasion through the extracellular matrix (ECM) ... Cancer cells initiate invasion by adhering ... wall. Proteolytic enzymes, such as MMP ... covering (basement membrane) surrounding the blood vessels ...
... quick and reproducible immunoprecipitation (IP) by using a ... reproducible than regular IPs, which are problematic with ... disrupting the agarose bed. The binding of the ... and elution of the immune complex can occur ...
... Rabbit anti-Wilm's tumor, Polyclonal Antibody, ... IHC-P: Use at a dilution ... assay dependent dilution. WB: Use at ... weight: 51 kDa. Not tested in ...
Biology Products: