{"id":3841210,"url":"https://alion.io/job/nasa-navigation-engineer-ii","title":"Navigation Engineer II","company":{"id":12944,"name":"NASA","domain":"nasa.gov","url":"https://alion.io/company/nasa","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workday","truth_index":{"grade":"B","score":75,"open_postings":13,"ghost_share":0,"stale_share":1,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-11-07T05:47:08Z"}},"role":"Industrial Engineering","role_family":"Industrial Engineering","seniority":"middle","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":118248,"max":144144,"currency":"USD","period":"year","gross":null,"usd_annual":144144},"salary_estimate":null,"experience_years_min":3,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"C++","optional":false},{"name":"Fortran","optional":false},{"name":"MATLAB","optional":false},{"name":"Python","optional":false}],"status":"live","first_seen_at":"2026-11-05T22:54:53Z","employer_posted_date":"2026-11-05","last_verified_at":"2026-11-07T08:34:06Z","board_verified":true,"closed_at":null,"days_open":1,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":1},"description":"Job Details\nNew ideas are all around us, but only a few will change the world. That’s our focus at JPL. We ask the biggest questions, then search the universe for answers-literally. We build upon ideas that have guided generations, then share our discoveries to inspire generations to come. Your mission-your opportunity-is to seek out the answers that bring us one step closer. If you’re driven to discover, create, and inspire something that lasts a lifetime and beyond, you’re ready for JPL.\nLocated in Pasadena, California, JPL has a campus-like environment situated on 177 acres in the foothills of the San Gabriel Mountains and offers a work environment unlike any other: we inspire passion, foster innovation, build collaboration, and reward excellence.\nThe Jet Propulsion Laboratory (JPL) seeks a Navigation Engineer to support Earth’s gravity-field recovery, precise orbit determination, and simulation activities for the Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) and Gravity Recovery and Climate Experiment-Continuity (GRACE-C) missions. This position focuses on developing, implementing, and validating methods and software to estimate Earth’s gravity field and its temporal variations from spacecraft tracking and instrument measurements.\nJPL’s Mission Design and Navigation Section develops navigation methods and tools, designs spacecraft trajectories, and navigates spacecraft to their destinations. The Solar System Dynamics Group (SSD), within JPL’s Mission Design and Navigation Section, studies the orbits and physical characteristics of natural bodies throughout the solar system. Its work includes:\nCharacterizing gravity fields, rotation, and shape using spacecraft and ground-based observations.\nComputing and predicting the orbits of natural solar system bodies.\nAssessing potential Earth impacts by near-Earth objects.\nDeveloping scientific models and analysis methods.\nMaintaining and disseminating ephemerides and related dynamical information.\nSSD team members collaborate with scientists and engineers throughout the United States and around the world to investigate planetary interiors, improve dynamical models, and support mission planning and scientific investigations.\nThe Navigation Engineer will be a member of the Solar System Dynamics Group and will report administratively to the Group Supervisor and programmatically to the relevant program or project leads.\nResponsibilities:\nPrimary tasks will include but are not limited to:\nPerform precise orbit determination, gravity-field recovery, and simulation studies in support of GRACE-FO and GRACE-C.\nDevelop, implement, test, and maintain scientific software for processing spacecraft observations and estimating orbital, gravity-field, and instrument parameters.\nProcess and analyze relevant mission data, including intersatellite microwave and laser ranging, GPS/GNSS observations, accelerometer measurements, and spacecraft attitude data, as applicable to each mission.\nEstimate spacecraft orbital states, gravity-field coefficients, accelerometer calibration parameters, and other relevant model parameters, together with their uncertainties.\nApply and evaluate dynamical and observation models, including models of gravitational and nongravitational accelerations, tides, and atmospheric and oceanic mass variability.\nAssess data quality, select appropriate observation weights, identify anomalous measurements, and investigate systematic errors in orbit and gravity-field solutions.\nConduct covariance, sensitivity, and error-budget analyses to evaluate the effects of measurement errors, instrument performance, and modeling assumptions on gravity-field recovery.\nValidate recovered gravity fields and orbit solutions through residual analysis, comparisons with independent solutions or observations, and other appropriate diagnostic methods.\nPresent analysis results, simulation findings, and uncertainty assessments to project scientists, technical leads, and collaborators.\nCollaborate with colleagues to document methods and publish research results in peer-reviewed journals.\nAdditional responsibilities may include:\nContribute to trade studies involving measurement accuracy, data types, processing strategies, and gravity-recovery performance.\nDevelop and assess improved physical models, estimation methods, and computational tools.\nSupport the development and testing of processing capabilities for GRACE-C.\nPrepare technical documentation, status reports, and presentations for project reviews.\nCoordinate with engineers, scientists, and external collaborators on assigned technical activities.\nTake responsibility for defined analysis or software-development tasks, including planning, execution, verification, and reporting.\nRequired Qualifications:\nBachelor’s degree in aerospace engineering, Astronomy, or related technical discipline with typically a minimum of 3 years of related experience; master’s degree in similar disciplines with a minimum of 1 years of related experience; or PhD in similar discipline.\nDemonstrated experience in satellite gravity-field recovery or closely related spacecraft-based gravity estimation, including hands-on estimation of gravity-field parameters from tracking observations.\nStrong knowledge of orbital dynamics, statistical estimation, numerical methods, and the mathematical foundations of gravity-field modeling.\nExperience with precise orbit determination and the estimation of dynamical or instrument parameters from spacecraft measurements.\nUnderstanding of measurement weighting, parameter observability, correlations, covariance analysis, and systematic errors.\nProficiency in scientific programming using one or more languages such as Fortran, Python, C++, or MATLAB.\nExperience developing, testing, debugging, and documenting scientific analysis software.\nAbility to evaluate technical results critically and communicate findings clearly to technical audiences.\nAbility to work independently on assigned tasks and collaborate effectively within a multidisciplinary team.\nPreferred Qualifications:\nExperience similar to recovering Earth’s time-variable gravity field from GRACE or GRACE-FO.\nFamiliarity with GRACE, GRACE-FO, or GRACE-C measurement architectures and instrument characteristics.\nExperience processing or modeling intersatellite ranging, GPS/GNSS, accelerometer, and attitude observations.\nExperience estimating spherical harmonic gravity-field coefficients and mascon models and evaluating the resulting solutions.\nFamiliarity with tidal models, atmospheric and oceanic de-aliasing products, reference frames, Earth orientation parameters, and nongravitational force modeling.\nExperience with accelerometer calibration, ranging-system errors, colored measurement noise, or regularization methods.\nExperience with large-scale estimation problems, efficient numerical linear algebra, or high-performance computing.\nA publication record demonstrating contributions to spacecraft-based gravity-field recovery, precise orbit determination, or closely related research.\nExperience with Fortran-based scientific software and Python-based analysis workflows.\nFamiliarity with MONTE, particularly for maintaining existing processing tools.\nAbility to lead defined technical tasks and collaborate across organizational or institutional boundaries.\nJPL has a catalog of benefits and perks that span from the traditional to the unique. This includes a variety of health, dental, vision, wellbeing, and retirement plans, paid time off, learning, rideshare, childcare, flexible schedule, parental leave and many more. Our focus is on work-life balance, and living healthy, fulfilling lives as we Dare Mighty Things Together. For benefits eligible positions, benefits are effective the first day of the month coincident with or immediately following the employee’s start date.\nFor further benefits information click Benefits and Perks\nThe hiring range displayed below is specifically for those who will work in or reside in the location listed. In extending an offer, Jet Propulsion Laboratory considers factors including, but not limited to, the candidate’s job related skills, experience, knowledge, and relevant education/training.\nThe typical full time equivalent annual hiring range for this job in Pasadena, California.\n$118,248 - $144,144JPL is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to sex, race, color, religion, national origin, citizenship, ancestry, age, marital status, physical or mental disability, medical condition, genetic information, pregnancy or perceived pregnancy, gender, gender identity, gender expression, sexual orientation, protected military or veteran status or any other characteristic or condition protected by Federal, state or local law.\nIn addition, JPL is a VEVRAA Federal Contractor.\nEEO is the Law.\nEEO is the Law Supplement\nPay Transparency Nondiscrimination Provision\nThe Jet Propulsion Laboratory is a federal facility. Due to rules imposed by NASA, JPL will not accept applications from citizens of designated countries or those born in a designated country unless they are U.S. Citizens, Legal Permanent Residents of the U.S or have other protected status under 8 U.S.C. 1324b(a)(3). 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