Latest Space News
Tue, 11 Dec 2018 21:54:27 +0000
Virgin Galactic plans to perform the next test flight of its SpaceShipTwo suborbital spaceplane as soon as Dec. 13, a flight that could be the first by the vehicle to reach at least one definition of space. SpaceNews.com
Tue, 11 Dec 2018 18:32:51 +0000
As a founder and chief strategy officer of ATLAS Space Operations, a satellite data communications company that has been doing this very same thing for the past four years, you might think I’d be a little nervous to see Amazon enter the industry. But I’m not. SpaceNews.com
Tue, 11 Dec 2018 09:56:03 +0000
With both the current Congress and his political career nearing their ends, Sen. Bill Nelson (D-Fla.) said Dec. 10 he’s continuing to fight to extend operations of the International Space Station through the end of the next decade. SpaceNews.com
Mon, 10 Dec 2018 18:27:02 +0000
Aerospace CEO Isakowitz: The government traditionally buys a bus, payload and ground segment as a package, he said. That does not give you flexibility to swap out and change pieces. SpaceNews.com
Mon, 10 Dec 2018 17:32:45 +0000
As NASA’s Voyager 2 spacecraft enters interstellar space, project officials have high hopes that it and its twin spacecraft will continue to operate for as long as a decade. SpaceNews.com
Mon, 10 Dec 2018 17:17:23 +0000
Spacecraft manufacturers have complained of stress on their supplier base as operators purchase fewer traditional geostationary satellites. One company in France is bucking that trend, however. SpaceNews.com
Mon, 10 Dec 2018 11:27:24 +0000
A NASA spacecraft originally built as part of the previous effort to return humans to the moon is now playing a key role in the new effort at human lunar return, including aiding commercial landers. SpaceNews.com
Mon, 10 Dec 2018 08:50:51 +0000
Planet's employees, customers and investors paint a picture of a company growing steadily while seeking to dramatically expand the market for data captured via satellite. SpaceNews.com
Mon, 10 Dec 2018 08:00:15 +0000
Two consulting firms anticipate strong demand for commercial Earth observation products and services in the next decade as satellite constellations offer an increasing array of optical, radar, hyperspectral and video imagery and data. SpaceNews.com
Sun, 09 Dec 2018 12:25:35 +0000
In recent years, there has been a boom of announcements for satellite constellations comprising satellites weighing as little as 3 kilograms to address a growing market of machine-to-machine (M2M) and Internet of Things (IoT) via satellite. SpaceNews.com
Fri, 07 Dec 2018 23:03:07 +0000
In an interview, Axelspace Chief Business Development Officer Yasunori Yamazaki, said the funding will enable the company of 65 people to continue building a constellation called AxelGlobe, though the company hasn’t decided on a final size for the constellation. SpaceNews.com
Fri, 07 Dec 2018 22:32:49 +0000
With a two-week extension of the stopgap spending bill funding much of the federal government enacted, the outgoing chairman of the House appropriations subcommittee that funds NASA says he’s hopeful to get a final spending bill approved before that bill expires. SpaceNews.com
Fri, 07 Dec 2018 21:09:10 +0000
China launched its Chang’e-4 moon mission Dec. 7, successfully sending the lander and rover into a lunar transfer orbit ahead of an unprecedented attempt at a landing on the far side of the moon early in the New Year. SpaceNews.com
Fri, 07 Dec 2018 20:17:37 +0000
The new launch date, announced Dec. 7 by customer Iridium Communications, was driven by the additional two weeks SpaceX ended up needing to launch Spaceflight Industries’ “SmallSat Express” dedicated rideshare mission. SpaceNews.com
Fri, 07 Dec 2018 12:03:51 +0000
While a SpaceX commercial crew test flight might not launch on a date in early January previously announced NASA, both agency and company officials are optimistic the mission will still fly later in the month. SpaceNews.com
Thu, 06 Dec 2018 23:10:23 +0000
During a Q&A session at a U.S. Chamber of Commerce summit to promote the space industry as an engine of innovation and economic growth, Griffin said he does not know when or how a new military branch will be organized. SpaceNews.com
Thu, 06 Dec 2018 21:55:50 +0000
Maxar Technologies sold one of satellite manufacturer Space Systems Loral’s facilities in Silicon Valley for $70 million, the company announced today. SpaceNews.com
Thu, 06 Dec 2018 21:34:19 +0000
A test flight in Alaska of a small launch vehicle by a stealthy startup company ended in failure in late November, the FAA has revealed. SpaceNews.com
Thu, 06 Dec 2018 21:19:28 +0000
President Trump has been insistent that a Space Force should be a completely independent military department. One way to organize the new service would be by establishing a Space Force under a larger Department of the Air and Space Force. SpaceNews.com
Thu, 06 Dec 2018 18:42:11 +0000
British satellite operator Inmarsat announced Dec. 5 it will be the first commercial customer of the next-generation H3 rocket from Mitsubishi Heavy Industries of Japan. 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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