Latest Space News
Fri, 19 Jan 2018 21:27:50 +0000
Details about how NASA will implement a space policy directive regarding a human return to the moon will be in the agency's 2019 budget request, scheduled for release as soon as early February. SpaceNews.com
Fri, 19 Jan 2018 18:54:25 +0000
California Assembly Appropriations Committee backs plan to create a California Aerospace and Aviation Commission to recommend action the governor and state legislature could take to retain jobs and encourage the industry's growth. SpaceNews.com
Fri, 19 Jan 2018 17:57:20 +0000
Defense Secretary Jim Mattis: “In space we will do our best to deter. But for right now, it’s about sizing up the problem." SpaceNews.com
Fri, 19 Jan 2018 15:46:13 +0000
Shortly after a Finnish company successfully launched the country’s first commercial SAR microsatellite, Finland’s president signed the country’s first comprehensive space legislation. SpaceNews.com
Fri, 19 Jan 2018 03:20:10 +0000
A Senate committee voted on party lines Jan. 18 to advance the nominations of individuals to lead NASA and the National Oceanic and Atmospheric Administration, although with no clear indication of when, or if, they will be confirmed by the full Senate. SpaceNews.com
Fri, 19 Jan 2018 01:19:43 +0000
Deputy Defense Secretary Patrick Shanahan will be taking on the duties of space adviser that previously resided with the secretary of the Air Force. SpaceNews.com
Thu, 18 Jan 2018 23:11:34 +0000
Griffin said it's imperative that the Pentagon focus on “rapid incorporation of technologies into new military capabilities.” SpaceNews.com
Thu, 18 Jan 2018 08:17:07 +0000
Sending data to and from different spots on Earth is big business for satellite operators, but Cloud Constellation sees a lucrative opportunity to offer satellites as the ultimate cloud storage solution for sensitive data. SpaceNews.com
Thu, 18 Jan 2018 00:54:25 +0000
There are many valid critiques of U.S. President Donald Trump’s new direction for NASA. Few, if any, would be new. But Russian government officials saw an opportunity for domestic attention and took a stab at it. SpaceNews.com
Wed, 17 Jan 2018 22:55:38 +0000
SpaceX reiterated at a congressional hearing Jan. 17 that its Falcon 9 rocket performed as expected on its most recent launch, despite swirling questions about the potential failure of the classified Zuma mission. SpaceNews.com
Wed, 17 Jan 2018 22:13:32 +0000
“What are we going to do about deterrence in space?” That is a question the administration should answer in the new strategy, said CSIS analyst Todd Harrison. SpaceNews.com
Wed, 17 Jan 2018 18:56:26 +0000
As the two companies developing commercial crew systems reiterated that they were on schedule to carry out test flights later this year, a government analysis of schedules concluded those vehicles may not be certified to carry NASA astronauts until late 2019 or early 2020. SpaceNews.com
Wed, 17 Jan 2018 16:03:18 +0000
With no budget deal in sight to avert a Friday government shutdown, a visibly frustrated Mac Thornberry, chairman of the House Armed Services Committee — and a vocal champion of bigger military budgets — called out his congressional colleagues for putting political agendas ahead of national security SpaceNews.com
Wed, 17 Jan 2018 12:12:59 +0000
Effective Space, a U.K.-headquartered company developing spacecraft to extend the life of communications satellites, announced Jan. 17 that it has signed its first contract with an undisclosed customer. SpaceNews.com
Wed, 17 Jan 2018 00:07:31 +0000
The Air Force will establish a three-star vice commander of Air Force Space Command to be located in the national capital region. SpaceNews.com
Tue, 16 Jan 2018 22:38:34 +0000
Virgin Orbit, which expects to debut the air-launched LauncherOne rocket by summer, signed a contract Jan. 16 with GomSpace to send eight nanosatellites into orbit next year to track airplanes and ships. SpaceNews.com
Tue, 16 Jan 2018 22:11:26 +0000
European launch provider Arianespace expects to conduct just 23 more Ariane 5 launches before the next-generation Ariane 6 becomes its primary rocket. SpaceNews.com
Tue, 16 Jan 2018 12:00:24 +0000
The new president of Canadian space technology company MDA says he sees opportunities for growth both within the country and beyond, while maintaining the company’s Canadian roots as part of a larger, and increasingly American, company. SpaceNews.com
Mon, 15 Jan 2018 20:44:32 +0000
The SBIRS satellites are equipped with powerful scanning and staring infrared sensors that collect data for use by the U.S. military to detect missile launches. SpaceNews.com
Mon, 15 Jan 2018 18:55:15 +0000
The plan is to shift the current ground software architecture to an open-systems platform that the Air Force would own and update with new technology as it becomes available. 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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