Science Systems and Applications, Inc (SSAI) is seeking an experienced and skilled Multi-GNSS Data Analyst. The successful candidate will be responsible for processing, analyzing, and validating Multi-GNSS data in support of precision positioning, navigation, and timing (PNT) applications. This role requires deep technical expertise in GNSS measurement processing, error modeling, and geospatial data analysis, with a strong focus on delivering high-accuracy positioning solutions for scientific and engineering applications.

Key Responsibilities:

GNSS Data Processing & Analysis

Process raw Multi-GNSS observations using precise point positioning (PPP), Post-Processed Kinematic (PPK), reduced dynamic, differential, undifferenced, and relative positioning techniques
Perform static, kinematic, and reduced dynamic Multi-GNSS data processing for ground-based, spaceborne, and airborne platform precise positioning and clock solutions including GNSS space vehicles, ground stations, and LEO geodetic satellites
Perform Multi-GNSS data processing in support of Earth Orientation Parameter (EOP) and reference frame solutions
Application and improvement of corrections for tropospheric delay, ionospheric delay, multipath, and other systematic error sources
Conduct integer ambiguity resolution to achieve centimeter-level positioning accuracy

Quality Assessment & Validation

Assess Multi-GNSS solution quality using statistical metrics, residual analysis, and independent validation datasets
Identify and mitigate systematic errors, outliers, and data gaps in Multi-GNSS observations
Compare Multi-GNSS-derived positions against ground truth and independent reference datasets
Document data quality issues and develop strategies for improvement

Integration & Geolocation

Integrate GNSS and IMU/INS data for precise platform positioning and attitude determination
Support geolocation of remote sensing data including laser altimeter measurements

Software & Tool Development

Develop, maintain, and improve GNSS data processing scripts and workflows using PERL, Fortran, C, Python, and similar languages
Work with Multi-GNSS processing software such as GIPSY-OASIS, BERNESE, and GEODYN
Automate data processing pipelines to handle large volumes of Multi-GNSS observations efficiently
Contribute to the development of data processing documentation and standard operating procedures

Collaboration & Communication

Collaborate with multidisciplinary teams including scientists, engineers, and project managers
Present technical results and findings to both technical and non-technical audiences
Contribute to technical reports, peer-reviewed publications, and conference presentations
Participate in field campaigns and provide on-site GNSS data collection support as needed

Required Qualifications:

Bachelor’s (B.S.) degree in Aerospace Engineering, Geodesy, Geomatics, Electrical Engineering, Physics, Computer Science, or a related field.
Minimum 5 years of experience in GNSS data processing and analysis.
Strong understanding of GNSS measurement models, error sources, and correction techniques.
Proficiency in at least one GNSS processing software package (e.g., GIPSY, BERNESE).
Experience with kinematic GNSS processing for spaceborne and airborne or mobile platforms.
Proficiency in Python, MATLAB, or C++ for data analysis and automation.
Familiarity with geodetic reference frames, coordinate systems, and datum transformations.
Strong analytical and problem-solving skills.
Excellent written and verbal communication skills.
U.S. Citizenship or Permanent Residency required.

Desired Qualifications

Master's or Ph.D. in Geodesy, Geomatics, Navigation, Aerospace Engineering or a closely related field.
Experience with kinematic and reduced dynamic Precise Orbit Determination (POD) for spaceborne GNSS receivers.
Experience with precise positioning and clock solutions for GNSS space vehicles and ground stations.
Experience with Post-Processed Kinematic (PPK), Precise Point Positioning (PPP).
Experience with integer ambiguity resolution techniques.
Experience supporting airborne or spaceborne remote sensing missions.
Knowledge of satellite gravimetry and laser altimetry.
Familiarity with IMU/INS integration and tightly/loosely coupled GNSS/INS processing.
Active participation in the geodetic or GNSS research community (publications, conferences).

EEO/AA Veterans and Individuals with Disabilities

Physical Requirements: While performing the duties of this job, the employee is regularly required to stand, walk, and use hands to touch, handle or feel objects, tools or controls. The employee frequently is required to talk and hear and occasionally required to reach with hands and arms and stoop, kneel, crouch, or crawl. Must regularly lift and/or move up to 10 pounds, and occasionally lift and/or move up to 25 pounds. Specific vision abilities required by this job include close vision, peripheral vision, depth perception and the ability to adjust focus

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