Latest Space News
Tue, 25 Sep 2018 23:01:45 +0000
Thornberry said he worries that too much attention is being paid to org charts and not enough to the substance of what space forces need. SpaceNews.com
Tue, 25 Sep 2018 18:47:52 +0000
A long-overdue exploration roadmap report released by NASA Sept. 24 offers an overview of the agency’s plans to send humans back to the moon and on to Mars, but few new details about how to carry out those plans. SpaceNews.com
Tue, 25 Sep 2018 17:42:53 +0000
Israeli satellite operator Spacecom said Sept. 25 that it has terminated contracts awarded earlier this spring to manufacturer Space Systems Loral and launch provider SpaceX for Amos-8, a telecommunications satellite the Israeli government said Sept. 3 would be built in Israel instead. SpaceNews.com
Tue, 25 Sep 2018 10:56:24 +0000
With growing doubts it will be selected by United Launch Alliance for its Vulcan rocket, Aerojet Rocketdyne is looking to smaller launch vehicles as potential customers for its AR1 engine. SpaceNews.com
Mon, 24 Sep 2018 23:30:02 +0000
NASA Administrator Jim Bridenstine played down any differences with his Russian counterpart as he gears up for meetings with him and other space agency leaders to discuss cooperation on NASA’s exploration plans. SpaceNews.com
Mon, 24 Sep 2018 12:31:35 +0000
If all goes as currently planned, sometime in 2022 a rocket will lift off carrying a payload that at first glance will look familiar. This payload, though, won’t be destined for geostationary orbit. Instead, the spacecraft will head to cislunar space. SpaceNews.com
Mon, 24 Sep 2018 10:40:01 +0000
Faced with growing competition from startups entering the field, Northrop Grumman Innovation Systems is looking to reduce costs on its existing Pegasus and Minotaur rockets. SpaceNews.com
Sun, 23 Sep 2018 15:10:09 +0000
With Congress set to approve a Federal Aviation Administration bill with some commercial space provisions, those in the industry are hoping for action on other bills before the end of this year. SpaceNews.com
Sat, 22 Sep 2018 00:22:48 +0000
It is evident we need to examine how to build a robust space economy and infrastructure, one built to accommodate future growth. SpaceNews.com
Fri, 21 Sep 2018 10:37:57 +0000
NASA is planning two alternative reviews of an airborne observatory amid conflicting congressional views on whether the program will be eligible for the next senior review of astrophysics missions. SpaceNews.com
Thu, 20 Sep 2018 23:58:10 +0000
One thing a highball estimate does accomplish is “shift the debate to how expensive this is going to be." SpaceNews.com
Thu, 20 Sep 2018 22:06:46 +0000
NOAA awarded more than $8 million in contracts this week to three companies in the second round of a commercial satellite weather data pilot program. SpaceNews.com
Thu, 20 Sep 2018 21:00:48 +0000
European launch provider Arianespace signed a contract with the Korean Aerospace Research Institute for a Vega C mission Sept. 20, growing the rocket’s backlog to five as its debut launch nears. SpaceNews.com
Thu, 20 Sep 2018 18:19:43 +0000
Whoever signs up for one of two certification flights for the Omega rocket, will get a ride “at a reduced rate." SpaceNews.com
Thu, 20 Sep 2018 01:45:58 +0000
"It doesn't necessarily mean buying a company. It could be buying a product line. It could be buying a portion of a business that fits with us. We want to make sure that it's strategic." SpaceNews.com
Wed, 19 Sep 2018 23:51:28 +0000
Bezos: At a time of increasing global competition, “You have to be able to go to space more frequently, with less lead time." SpaceNews.com
Wed, 19 Sep 2018 23:32:28 +0000
Kleos Space, a company developing a constellation of satellites for radiofrequency geolocation work, will launch its first satellites in 2019 with Rocket Lab under a deal announced Sept. 19. SpaceNews.com
Wed, 19 Sep 2018 20:27:57 +0000
A Georgia county seeking to develop a spaceport has attracted a small launch vehicle company to set up operations and, hopefully, launch from there. SpaceNews.com
Wed, 19 Sep 2018 19:28:56 +0000
Shanahan on space reorganization: “We’re going to find the best way. There will be some hammering and arm wrestling. " SpaceNews.com
Wed, 19 Sep 2018 15:12:29 +0000
Gen. Jay Raymond: “There’s an explosion of things happening in the commercial industry. We want to capitalize on that." SpaceNews.com
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  • CV: GNC Engineer

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    Personal information
     Name:<withheld>
     Age:<withheld>
     Country:<withheld>
     Location:<withheld>
    Contact information
     Email:<withheld>
     Phone:<withheld>
     Mobile:<withheld>
    Candidate Profile
     Date Submitted:29-03-2017
     Last Modified:19-04-2017 (08:16)
    Job information
     Current job:GNC Engineer
     Employment Term:Permanent
     Job location:US only
     Date available:immediately
     Industry:Satellite Manufacturers and Subcontractors, Satellite Operators, Launch Systems, Space Tourism
     KeywordsADCS (GNC), and TT&C (RF Comm)
    CV

    Professional SUMMARY

    I’m working on a part time basis with the Johns Hopkins University – Applied Physics Lab as part of my masters in Space Systems Engineering. Specializing in the Spacecraft Guidance Navigation and Control with emphasizes on conducting the end to end design that will produce an agile spacecraft. Areas of attitude estimation, attitude control and spacecraft pointing stabilization, and orbital determination, working on simulating 6-DOF for a space mission I’m working on using Matlab/Simulink. In addition, I’m the TT&C (RF Comm) subsystem lead with emphasizes on the design and testing of spacecraft antenna and needed components for a functioning subsystem. Also, studying to a certain depth the rest of the subsystems needed by any spacecraft such as EPS, C&DH, Thermal, Propulsion, Mechanical, FSW, and different types of payloads. Knowing how to design each subsystem by matching and refining the mission requirements and developing design budget to balance cost, schedule, and performance conduct trade studies and risk analysis. After the finish of the end to end conceptual design of the space mission we are designing. We will also, integrate, and test the needed flight hardware. This degree is developing the overall knowledge of a space system giving me the perspective of a systems engineer as well giving me the in-depth knowledge in ADCS and TT&C.  In addition, to my JHU-APL work I have seven years of RF Engineering experience with in-depth knowledge in RF Fundamentals, radio propagation modeling and prediction, microwave path analysis, interference analysis, and antenna theory. I also have hands-on experience with RF hardware Integration, testing, and troubleshooting from radios, transmission line, connecters, amplifiers, antennas, and other essential components

    KEY COMPETENCIES

    Ÿ MatLab            Ÿ C++          Ÿ STK-AGI Certified              Ÿ ODTK             Ÿ Space Systems                 Ÿ ADCS (GNC)       Ÿ TT&C(RF)    Ÿ Astrodynamics and mission design                                  

    PROFESSIONAL EXPERIENCE

    Johns Hopkins University – Applied Physics Laboratory, Laurel, MD                 Aug 2016-Present Space Systems Engineer (TT&C and GN&C Subsystems Lead) Part Time Graduate Student attending remotely

    ADCS (GNC) Subsystem Lead:

    Calculating Center of pressure for every major area of the spacecraft, after getting center of mass, and spacecraft moment of Inertia from mechanical subsystem lead

    Calculating all possible forces acting on the spacecraft such as aero-force (for LEO), solar pressure, gravity gradient, and others. Then, calculating torque acting on the spacecraft and total torque in three dimensions (x,y, and z axis)

    Finding out needed torque to overcome outside forces acting on the spacecraft. And thus, sizing reaction wheels to achieve 3-axis stabilized spacecraft

    Finding out needed momentum sizing and then selecting appropriate method to dump momentum either using torque rods or thrusters

    The use of TRIAD algorithm to find attitude estimation matrix, angle of rotation, and axis of rotation. This is also used as part of 6-DOF analysis (if needed)The selection of two different sensors to give four different vectors

    Used Star tracker, Earth horizon sensors: 1st two vectors in body frame. 2nd two vector in inertial frame, those are used to complete 3-degrees of attitude (x,y,z). Also, used sun sensors for safe mode and solar panels pointing.

    Used velocity and distance tracking to be used as part of 3-degrees of position (x,y,z)

    Attitude estimation will be used as a feedback to perform attitude control using reaction wheels where there Is a wheel perpendicular to each axis (x,y,z)

    Also Attitude estimation will be used for position change as part of mission design to fire thrusters during phasing maneuver, and Hohmann transfer to lower orbit

    Summary of sensors:

    Star tracker: for attitude estimation

    Earth Horizon sensor: for attitude estimation (spacecraft must be nadir pointing)

    Sun sensors: for safe mode and solar panel pointing

     

    TT&C Subsystem lead:

    Perform Link Budget analysis for Space to Ground, Ground to Space, and Space to Space Link, proximity links

    Calculate needed cant angle for line of site communication for space to space links

    Develop TT&C block diagram

    Design needed components to perform as required such asSelection of transponder(s) for two-way accurate tracking:

    Velocity (Doppler shift) and Distance tracking

    Modulation (using BPSK, QPSK, or others) and Demodulation

    Forward Error Correction (FEC), such as Convolutional coding (Turbo Code or others)

    Selection of Amplifiers

    SSPA (Solid State Power Amplifier): built in transponder or separate depend on needed amplification that will be delivered to the antenna (<15W)

    TWTA (Traveling Wave Tube Amplifier): more than 15W usually separate from Transponder

    LNA (Low Noise Amplifier): used to amplify received signal given the received signal power is very low and hence very close to noise floor this amplifier is needed to amplify the signal power and minimize the amplification of noise usually NF<2dB

    Antennas: selection and design is based on many factors such as

    Spacecraft mass and power budget allocation to TT&C subsystem

    Spacecraft Link budget allocated to different links

    Received signal wavelength (Bands such as S, X, Ka, and Ku)

    Needed bandwidth of how many frequencies it could intercept

    Required EIRP to deliver minimum signal power to the other end

    Directivity

    Needed Beamwidth

    Needed gain

    Other components:

    Diplexer: acts as a filter if same antenna is used for TX/RX

    Hybrid Couplers: if equal power division is needed

    Switches: if there is a need to turn on/off different antenna or if there is a redundant system

    Transmission line: this is where impedance matching with the load (usually antenna) will need to be worked out to deliver as much power to the antenna throughout the transmission line as possible with the least reflected power. Thus, low VSWR.

     

    Johns Hopkins University – Applied Physics Laboratory, Laurel, MD                                                                Jan 2016-Present Space Systems Engineering Part Time Graduate Student attending part time via live video conference, 2016-Present

    The degree goal is to know how to design a space mission for both Earth orbits and deep space, we must be able to design the space mission by analyzing the mission goals and parameters and getting the mission different parameters and budgets such as Mass and Power budgets, as well conduct end to end design for all spacecraft subsystems.

    Working on designing a constellation of 6-10 spacecraft that can detect and report forest fire for NATO countries (The mission is comparable to the FireSatII)

    I’m acting as the Telemetry Tracking and Command (TT&C) subsystem lead, and Attitude Determination Control (ADCS) subsystem lead In addition, I’m responsible on Mission trade studies, Mission design summary, mission requirements, and Delta V budget

    Studying Spacecraft orbital mechanics and astrodynamics and using that knowledge in designing various missions using STK as well getting their parameters using mathematical equations and lastly the ability to calculate the required Delta V budget through the mission life time

    Knowing how to design the spacecraft subsystems and how they can get integrated and tested to operate fully in the environment of space

    In addition to the constellation design, there will also be another space mission will involve hardware design (CubeSat)

    study critical risk-based decision making required from system concept definition and degree auditing through design, procurement, manufacturing, integration and test, launch, and mission operations

    Study and apply mission assurance, ensure mission reliability, and system safety throughout the life cycle of the mission to achieve mission success

    Mission assurance such as risk management, system safety, reliability engineering, parts and materials, configuration management, requirements verification and validation, non-conformance, and anomaly tracking and trending.

     

    Mobilitie, Dallas, Texas       March 2017-Present

    Senior RF System Engineer, 2017-present

     

    Fusion Solutions Contractor, Dallas, Texas              Jan 2016-Nov 2016

    Sr. RF System Engineer Jan 2016- Dec 2016

    Strong Radio Frequency fundamentals, wave propagation, and Antenna theory. A senior DAS and small cells Design Engineer with responsibility on designing & configuring a Varity of custom configured wireless distributed networks with deep knowledge in overall DAS, small cells, antenna systems, and end to end wireless architecture. In addition, assuming full responsibility on the end to end system design. Outdoor small cells design to increase location capacity, and provide superior end customer experience.

    ERICSSON, Plano, Texas                           2010-2015

    RF System Engineer, 2010 – 2015

    RF Engineer Subject Matter Expert and solutions architect with in-depth knowledge of the fundamentals of Radio Frequency, wave propagation, antenna theory, transmission line theory, impedance matching, RF link budget analysis, . Worked on building, designing, integrating, testing, and optimizing end to end wireless networks with hands-on experience with Air Interface side and communication tower hardware such as Radios, cables, jumpers, amplifiers, and antennas. RF Technical Leader and a Subject Matter Expert (SME) with responsibility for, developing, building, and leading technical engineering teams in LTE, VOLTE, IMS Planning, Tuning, optimization, DAS, and small cells high profile projects. In addition, wrote technical documents, research & trial parameters & features

     

    EDUCATION / TRAINING

    Masters of Science, Space Systems Engineering

    Johns Hopkins University, Baltimore, MD - EST 2018 (Current GPA 4.0/4.0)-Administrated by the Applied Physics Laboratory

    Bachelors of Science, Electrical Engineering

    University of South Alabama, Mobile, AL - 2009

    Professional Affiliations: 1. AIAA (American Institute of Aeronautics & Astronautics) 2. IEEE (Institute of Electrical & Electronics Engineers)


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