Latest Space News
Fri, 17 Nov 2017 00:00:00 +0100
Landing on Mars is difficult and not always successful. Well-designed advance testing helps. An ambitious NASA Mars rover mission set to launch in 2020 will rely on a special parachute to slow the spacecraft down as it enters the Martian atmosphere at over 12,000 mph (5.4 kilometers per second). Preparations for this mission have provided, for the first time, dramatic video of the parachute opening at supersonic speed. The Mars 2020 mission will seek signs of ancient Martian life by investiga...
Thu, 16 Nov 2017 15:07:00 +0100
The U.S. Navy's Communications Satellite Program Office, PMW 146, and Lockheed Martin (NYSE: LMT) handed over full operational control of the fifth Mobile User Objective System (MUOS) satellite to the Naval Satellite Operations Center (NAVSOC). The October 11 milestone followed the successful completion of the MUOS-5 satellite's on-orbit testing and delivery of all operational products needed to "fly" the satellite. In April, the Navy, working with Army Forces Strategic Command (ARSTRAT), con...
Thu, 16 Nov 2017 14:04:00 +0100
As part of ESA's strategy to foster commercial competitiveness in Europe while focusing on its core aims, the agency has transferred ownership of several ground tracking stations for reuse by external organisations. By the end of 2017, ESA will have transferred three stations to national organisations in Spain and Portugal, who will take over the provision of satellite tracking services to a wide variety of commercial customers. The three stations involved in the transfer are all equipped ...
Wed, 15 Nov 2017 19:33:00 +0100
Boeing [NYSE:BA] won large commitments across its twin- and single-aisle commercial airplane families, debuted key capabilities including the CST-100 Starliner docking and KC-46 refueling simulators, and announced services agreements at the 2017 Dubai Airshow. "This has been a very successful show for Boeing. Our regional customers have maintained their trust in our products and technology, and our partnerships in the Middle East region continue to grow," said Bernard Dunn, President, Boeing ...
Wed, 15 Nov 2017 12:00:00 +0100
A temperate Earth-sized planet has been discovered only 11 light-years from the Solar System by a team using ESO's unique planet-hunting HARPS instrument. The new world has the designation Ross 128 b and is now the second-closest temperate planet to be detected after Proxima b. It is also the closest planet to be discovered orbiting an inactive red dwarf star, which may increase the likelihood that this planet could potentially sustain life. Ross 128 b will be a prime target for ESO's Extremely ...
Wed, 15 Nov 2017 11:29:00 +0100
Thales Alenia Space, a joint venture between Thales (67%) and Leonardo (33%), has been chosen by the Italian space agency ASI to develop an instrument called RIME (Radar sounder for Icy Moons Exploration) for the JUICE (JUpiter Icy moons Explorer) mission, part of the European Space Agency's "2015-25 Cosmic Vision" program. Scheduled for launch in 2022 with an expected arrival in 2029, the JUICE mission is designed to study the Jovian system and more specifically its icy moons, Ganymede, Call...
Wed, 15 Nov 2017 00:00:00 +0100
The Ariane 5 for Arianespace's December 12 year-ending flight for 2017 has completed its initial build-up at the Spaceport in French Guiana - where preparations also are moving ahead with four satellite passengers that will further expand Europe's Galileo global navigation system once in their final orbit. During activity in the Spaceport's Launcher Integration Building, this heavy-lift vehicle for Arianespace Flight VA240 underwent the assembly process that began by mating its two solid prop...
Tue, 14 Nov 2017 19:47:00 +0100
The Defense Advanced Research Projects Agency (DARPA) has awarded BAE Systems a contract worth up to $12.8 million to develop an innovative space evaluation and analysis testbed to support the development, integration, evaluation and analysis of advanced space enterprise command and control (C2) tools and capability technologies. The U.S. military must be able to quickly establish situational awareness and execute operations in space. Within the space domain, many thousands of objects that ar...
Tue, 14 Nov 2017 13:45:00 +0100
Orbital ATK (NYSE: OA), a global leader in aerospace and defense technologies, today announced that the "S.S. Gene Cernan" CygnusTM spacecraft successfully completed its rendezvous and berthing maneuvers with the International Space Station earlier this morning. This marks the company's eighth successful berthing with the orbiting laboratory. Cygnus launched into orbit aboard an Orbital ATK Antares(tm) rocket at NASA's Wallops Flight Facility on November 12. The spacecraft then executed a ser...
Mon, 13 Nov 2017 17:45:00 +0100
Thales Alenia Space has signed a contract with ArianeGroup, prime contractor and design authority of Ariane 6, to design, develop, qualify and manufacture the telemetry transmitter of the new European launcher. The telemetry transmitter is responsible for transmitting to the ground the data generated by the launcher throughout the whole launch mission. It is the first contract of the company in Spain in the launchers segment. After three decades of activity in the space sector participating i...
Mon, 13 Nov 2017 17:00:00 +0100
What seemed at first like a rare instance of a huge, ancient galaxy revealed itself to be an even rarer pair of extremely massive galaxies, seen on the brink of merging when the Universe was only a billion years old. This outstanding source was first identified by ESA's Herschel space observatory, and later exposed in greater detail with the ground-based Atacama Large Millimeter/submillimeter Array (ALMA) in Chile. The earliest galaxies in the 13.8 billion-year history of our cosmos starte...
Mon, 13 Nov 2017 16:00:00 +0100
Gas giant Jupiter, organic molecules in star-forming clouds and baby galaxies in the distant Universe are among the first targets for which data will be immediately available from the James Webb Space Telescope once it begins casting its powerful gaze on the Universe in 2019. Thirteen "early release" programmes were chosen from more than 100 proposals after a competitive peer-review selection process within the astronomical community. The programmes have been allocated nearly 500 hours of obs...
Mon, 13 Nov 2017 00:00:00 +0100
After a successful year-long test campaign by Airbus at IABG in Ottobrunn near Munich, the twin GRACE-FO (Gravity Recovery and Climate Experiment Follow-On) satellites will soon travel to their launch site in California. During testing, the gravity-measuring satellites, which will track the continuous movement of liquid water, ice and the solid Earth due to Earth's changing seasons, weather and climate processes, earthquakes and even human activities, were subjected to conditions similar to t...
Sun, 12 Nov 2017 16:15:00 +0100
Orbital ATK (NYSE:OA), a global leader in aerospace and defense technologies, successfully launched its Antares(tm) rocket carrying a Cygnus(tm) spacecraft today at 7:19 a.m. EST, from NASA's Wallops Flight Facility in Wallops Island, Virginia. The launch is Orbital ATK's eighth cargo delivery mission to the International Space Station for NASA. During the mission, designated OA-8, Cygnus will deliver vital equipment, supplies and experiments to the astronauts aboard the space station, as well a...
Fri, 10 Nov 2017 00:00:00 +0100
A contract for two new generation communications satellites was signed today by Turksat with Airbus Defence and Space. The satellites, Turksat 5A and Turksat 5B, are based on the latest Electric Orbit Raising (EOR) version of Airbus' highly reliable Eurostar E3000 platform, which uses electric propulsion for in-orbit raising and station-keeping. "We are very pleased to welcome Turksat as a new Eurostar customer for the most powerful satellites of their fleet. We were the first to demonstra...
Thu, 9 Nov 2017 14:04:00 +0100
NASA's Orion spacecraft aims to send humans further into space than ever before, and ESA's European Service Module will provide the essentials for keeping the astronauts alive and on course. A review of the programme by NASA to assess progress is now showing a launch date from December 2019 to June 2020. The first Exploration Mission-1 will circle the Moon without astronauts to lay the foundation and prove the technology for a second mission with a crew. In Bremen, Germany, integration ...
Thu, 9 Nov 2017 11:42:00 +0100
A UK company has been selected to undertake the Assembly, Integration and Test (AIT) for a satellite which will help tackle climate change, Science Minister Jo Johnson announced today. Thales Alenia Space has signed a contract with the UK Space Agency to work on MicroCarb, a joint UK-French satellite mission which will measure sources and sinks of carbon, the principal greenhouse gas driving global warming. It is the first European mission intended to characterise greenhouse gas fluxes on Ear...
Thu, 9 Nov 2017 00:00:00 +0100
At the Dubai Airshow, which runs from 12th to 16th November 2017, Airbus will showcase its wide range of innovative technologies, products and services, from market-leading commercial and military aircraft to helicopters and space systems. The Airshow, which was launched in 1986, represents one of the largest and most important aerospace events in the world. The Dubai Airshow is an important platform for Airbus to demonstrate its products and services to customers as the organisation looks to...
Wed, 8 Nov 2017 22:05:00 +0100
ViaSat Inc. (NASDAQ: VSAT), a global broadband services and technology company, today announced it expanded its relationship with JetBlue, and will serve as the direct in-flight internet service provider to the airline. JetBlue aircraft will be upgraded to the latest ViaSat hardware, and will have access to the additional coverage and capacity offered by ViaSat's next-generation ViaSat-2 and ViaSat-3 satellite platforms JetBlue first offered the ViaSat in-flight internet service, branded Fly-...
Wed, 8 Nov 2017 19:05:00 +0100
Berkeley Lab and UC Berkeley scientists were part of a team that helped to decipher one of the most bizarre spectacles ever seen in the night sky: A supernova that refused to stop shining, remaining bright far longer than an ordinary stellar explosion. What caused the event is puzzling. A Las Cumbres Observatory press release about the supernova, which was discovered by the Palomar Transient Factory in September 2014, noted that the explosion at first appeared to be an ordinary supernova. "Se...
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    Personal information
     Name:<withheld>
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    Contact information
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    Candidate Profile
     Date Submitted:04-09-2016
     Last Modified:04-09-2016 (01:55)
    Job information
     Current job:Team Lead
     Employment Term:Permanent
     Job location:Anywhere
     Date available:within 2 months
     Industry:
     KeywordsPower electronics, design engineer, dc dc converter , switching regulator
    CV

    ISRO Satellite Centre, Bangalore, India                            

    Objective:

    To obtain a challenging position that will enable me to use my organizational skills, educational background and ability to work well as a team member. I will work my best to contribute to the growth of the organization and to the growth of my career. I have more than 5 years of experience in development of various kind of power supply like dc-dc converter, power processing unit for various ion thrusters for space application. I also have sound knowledge of various kind of Military standard required for qualify develop products.

    Employment:

     

    Company       :  ISRO Satellite Centre, Indian Space Research Organization

    Location         :  Bangalore

    Country          :  India

    Job Title         :  Scientist/Engineer

                Job Role        :  Research and development of Power units for ion thrusters and dc-dc converters

                Duration        :  Aug 2011 to till date

     

    Projects Summary:

    As a member of Power Conditioning and Distribution Section, Power Electronics Division, my major responsibilities are to develop various kind of power supplies required for ongoing projects.

    My contributions are

     

    POWER PROCESSING UNIT FOR 18mN ,75mN and 300mN ELECTRIC ION THRUSTER (PPU)

    Realization of proto and flight model of PPU for ongoing GSAT-9 18mN ion thruster and involved during interface between ion thruster, NCT package and PPU and debug the problems during interface test. Also involved in design and development of PPU for 75mN and 300mN ion thruster for future projects.

     

    Anode Supply :

    Anode Supply for Gsat-9 18mN ion thruster:

    Realized buck cascade push pull topology based 300V/1.5A constant voltage power supply. Ignition circuit also designed from Anode Supply to ignite thruster with high surge current and also 0.6A constant keeper supply Ored with ignition.

    Development of 550V/1.5A constant voltage module supply to get 550V/3A anode supply (2 modules in parallel) for 75mN thruster and 550V/9A anode supply (6 modules in parallel). Ignition circuit is also designed from Anode supply (requirement of ignition circuit: 300V, 60A surge current). Ignition circuit and anode module are developed and successfully interfaced with 75mN ion thruster.

     

    Heater Supply

    Heater Supply for Gsat-9 18mN thruster :  Realized isolated 12A constant current power supply   for load range of 0.2 ohm to 1.5 ohm  for GSAT-9

    Heater Supply for 75mN thruster: Developed isolated constant current power supply with DAC interface to get initialization current of 1A, 3A, 5A, 7A and 8.3A constant current for resistance range of 0.2 ohm to 2 ohm. Heater supply is developed and interfaced with 75mN thruster successfully.

     

    Magnet Supply :

    Magnet Supply for Gsat-9 18mN thruster: Realized magnet power supply of 1.8A for inner magnet and 1.4A for outer magnet with two outputs single power supply.

    Magnet supply for 75mN: Constant current power supply with step change from 1.4A to 1.8A similar to heater supply made for 75mN and successfully interfaced with 75mN thruster.

     

    Realization of bias supply , Output Filter , switching circuit for 18mN thruster:

    Realization of 3 numbers of 10W fly back topology based converter to provide isolated bias supply to various power module in PPU.

    Realization of filter box between anode supply of PPU and thruster anode

    Switching circuit is also realized to power on and off various power module of PPU

     

    Interface between proto model of PPU, 18mN ion thruster and NCT package

    Involved during interface between proto model and flight model of GSAT-9 PPU, thruster and NCT control package and troubleshoot problems when encountered.

     

    BATTERY CHARGE REGULATOR:

    BCR For 70V bus :

    Development of 750W BCR (buck converter) Engineering model for autonomous charging of battery in satellite from Bus.

    3D control loop implementation to take care of bus priority over battery charging and taper the current as battery gets fully charge.

    Qualification model of BCR is under progress

    Flight model Is planned for NISAR and RISAT projects

     

    DESIGN AND DEVELOPMENT OF ISOLATED DC-DC CONVERTER

    10 W fly back topology based dc-dc converter with multiple output

    Design and develop 10W three outputs dc-dc converter for 42V and 70V bus.

    Qualify this converter to meet all Military standard like EMI, vibration, thermovac etc

    First flight model Flown in IRNSS-1G

     

    40 W Single output Forward topology based low voltage high current converter

    Development of 3.3V/8A and 5V/8A single output converter for space application

    Qualification of this converter for both 42V bus and 70V bus

    Planned for future spacecraft like Risat-2, Cartosat-3

     

    Supervisees the vendors for  Production of 4.5W and 20W converter dc-dc converter

    Supervises the vendors and troubleshoot all problems when encountered during production of fly back topology based 4.5W converter and forward topology based 20W dc-dc converter.

    Involved in modification of 20W converter to work as 60W converter.

     

    LINEAR REGULATOR LDO

     

    Requirement: Subsystem are facing problem with imported LDO like OM7764 is whenever 1553 transient is there, they observe change in output voltage that degrade the performance of their package. For improvement they are forced to use high value of capacitors which results in oscillation for some users. This is the driving factor for us to develop current control based indigenous LDO which support 1553 transition of no load to 3A also without any overshoot and with less capacitor of 22 uF instead of 680 uF.

    Two versions of LDO were designed. One with Mosfet as a pass element and the other was Transistor as a pass element.

    Both the circuits were simulated using PSPICE.

    The MOSFET based circuit is used in 10W DC-DC converter for output voltage of +5V.

    The transistor based LDO is hybridized and realized as an off the shelf product.

    The pin configuration and the size of the hybridized LDO package is maintained similar to existing imported package OM7764 (IR LDO)

    The HMC was tested for various specifications at ambient temperature and -40 to +65 at thermovac.

    Interacted with SRG for carrying out the derating analysis.

     

    MODELING AND SIMULATION:

     

    Simulation of Power processing unit for ion thruster various power supply like Heater, Magnet and Anode in PSIM

    Simulation of Battery charge regulator in PSIM with 3D control system

    Simulation of EMI filter and studied the effect for the same on input impedance of various power supply in PSIM and PSPICE

    Modeling and simulation of 40W (5V/8A) forward converter and 10W fly back converter and 20W forward converter in Simulink/Mat lab and used this model for feedback controller design for converters.

     

    Modeling of saturable core and simulation of magnetic current sensor       (unidirectional and bidirectional) for sensing dc current up to 1000A in PSIM software without fold back

    Simulation and analysis of effect of multi-junction Solar Array capacitance, inductance and resistance of harness on Switching String for 42V Bus application in ORCAD as well as in  MATLAB.

    Simulation of various analog circuit used during design of power supply in Orcad /Pspice.

    Software Used :  PSIM, Orcad/Pspice, Simulink/Mat lab

     

    Skills

     

    Sound knowledge of various MIL Standard used for space application products like Derating analysis, Thermovac condition, vibration limit, EMI requirement etc.

    Good knowledge of EMI filter design for power supply to meet MIL STD

    Experience in end to end design and development of various topology of dc-dc converter and qualify the design for space application.

    Experience in design and development of low dropout regulator for satellite application

    Experience in Hybridization of dc-dc converter and LDO to reduce the size from SMT version

    Sound knowledge of various software like Pspice, PSIM, Matlab etc

    Experience in working on ADC, DAC and Microcontroller for mixed signal operation.

     

    Educational Qualification:

     

    Bachelor in Avionics from Indian Institute of space science and technology with CGPA of  8.73./10 (www.iist.ac.in)

    Pre – University course, Bihar intermediate science with Percentage: 75.4%  (3rd topper in state board)

    Matriculation  (Class X), C.B.S.E, with Percentage: 89.4%

     

                  

    PUBLICATION:

     

    “Simulation And Verification of Discontinuous Mode Fly back Dc-dc Converter Using Simulink” in Mat lab Expo 2014, Bangalore.

    “Effect Of Solar Cell Capacitance And Interface Cable Inductance On The Shunt Switch Current Transients In Spacecraft Power Conditioning Unit” in IEEE international conference ICRAIE-2014, Jaipur.

    “Modeling of Solar array and Analyze the Current Transient Response of Shunt Switch Voltage Regulator in Spacecraft Power Conditioning Unit” in Journal of Advanced Computing and Communication Technologies (ISSN: 2347 - 2804) Volume No.3 Issue No. 2, April 2015 pp 33-39


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