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:4/10/2015)... April 10, 2015 Research and ... the "Security Competitive Profiles - NEC" report ... NEC will continue to supply a range ... market, with a company focus on the development of ... Winning opportunities in the Asia-Pacific ...
(Date:4/6/2015)... Conn. , Apr. 6, 2015 NXT-ID, ... "Company"), a biometric authentication company focused on the ... has filed provisional patent 62/143028 for ... COMMUNICATIONS AND ENERGY TRANSFER  NXT-ID introduces a ... payments. This patent surrounds the use of miniature ...
(Date:4/2/2015)... Sweden , April 2, 2015 ... for Q1 2015 attributed to somewhat higher than 125 ... in the year-end report 2014 that revenues for Q1 ... that the company reported for Q4 2014. The operating ... to be negative. The complete interim report will as ...
Breaking Biology News(10 mins):NEC Security Competitive Profile 2015 2NXT-ID Patents Miniature, Low Power Wireless Magnetic Stripe 2NXT-ID Patents Miniature, Low Power Wireless Magnetic Stripe 3NXT-ID Patents Miniature, Low Power Wireless Magnetic Stripe 4Fingerprint Cards Revises Revenues for Q1 2015 2
... of Adelaide reproductive biologist has achieved a major breakthrough ... of women around the world who have suffered previous ... NHMRC Principal Research Fellow and member of the University,s ... develop a product which improves IVF embryo implantation rates ...
... (Jan. 5, 2011) The number of women who ... 59 percent over the last two decades thanks to ... recent study. The report,s lead researcher, Joy Hawkins, ... at the University of Colorado School of Medicine, said ...
... St. Louis, MO, January 6, 2011 Thanks to the ... statistics like 1 in 4 children are obese and childhood ... With this platform, nutrition education and physical activity in the ... study in the January/February 2011 issue of the Journal ...
Cached Biology News:IVF breakthrough to hit the world market 2Deaths from anesthesia during childbirth plummet 2School-based interventions for obesity 2
(Date:5/5/2015)... 2015 Research and Markets ( ... "Clinical Laboratory, Molecular Diagnostics and Genomic Testing ... - Global Version" report to their offering. ... area of molecular diagnostics and pharmacogenics hold the ... market that is moving out of the national ...
(Date:5/5/2015)... , May 5, 2015 CytomX, a ... cancer, today announced that Sean McCarthy , D. ... Suisse Antibody Day in New York ... Dr. McCarthy will present an overview of CytomX,s Probody ... drug conjugate programs. About CytomX Therapeutics ...
(Date:5/5/2015)... 5, 2015   Tocagen Inc. , a ... R. Parkinson , M.D., a venture partner at ... the board of directors of Tocagen. Dr. Parkinson ... oncology clinical development, including leading clinical activities at ... of the cancer therapeutics Gleevec®, Femara®, Zometa®, Kepivance® ...
(Date:5/5/2015)... GEA Pharma Systems, G-CON Manufacturing ... of the INTERPHEX Exhibitor Awards for 2015 for ... Continuous, Miniature and Modular (PCMM) platform. PCMM comprises ... processing equipment, smart control systems and PODs (portable, ... inactive ingredients into bulk tablets. , PCMM ...
Breaking Biology Technology:Global Clinical Laboratory, Molecular Diagnostics and Genomic Testing Services Market Trends and Forecast 2015 to 2019 2Tocagen Appoints David R. Parkinson, M.D., to the Board of Directors 2Tocagen Appoints David R. Parkinson, M.D., to the Board of Directors 3Tocagen Appoints David R. Parkinson, M.D., to the Board of Directors 4GEA Pharma Systems, G-CON Manufacturing and Pfizer Consortium Receives Best Technology Innovation Award at INTERPHEX 2015 2GEA Pharma Systems, G-CON Manufacturing and Pfizer Consortium Receives Best Technology Innovation Award at INTERPHEX 2015 3
... For the second time this year, a tech-based company in ... to the public. Called an initial public offering, this kind ... and investors who are directly involved, but to others who ... Madison-based biotechnology company, has filed papers with the Securities ...
... rates of failure. As a result, many organizations are ... result stifles innovation, growth, and a company's competitive advantage. ... flawed processes of yesterday, and introducing methods that create ... delivery of functional software. , , Evidence , ...
... - Now that two companies he once owned have ... Brian Wiegand's days as a self-described serial entrepreneur might ... NameProtect , a developer of digital brand management services, ... of Wilmington, Del. , ,He will concentrate on growing ...
Cached Biology Technology:Wisconsin IPOs are a harbinger of growing tech economy 2Wisconsin IPOs are a harbinger of growing tech economy 3Agile Revolution: A new era of software delivery 2Agile Revolution: A new era of software delivery 3Agile Revolution: A new era of software delivery 4NameProtect sold, tech entrepreneur to focus on Jellyfish.com 2
... The Fujifilm Life Science LAS-3000 ... technology with a simplified user interface, ... a wide range of modularities. The ... for a wide range of applications ...
The LAS-3000 imaging system combines new CCD camera technology with a simplified user interface to provide significantly improved system sensitivity with a wide range of modularities. This system is...
Capture faint-light images without losing sensitivity or resolution. With its brand new hardware and interface design, the LAS-1000plus turns sample imaging into a simple process....
Designed for use with the Agencourt CleanSEQ and Agencourt AMPure 384-well SPRI reagent kits. For use with 384-well thermal cycling plates....
Biology Products: