ADDITIONAL INFORMATION: The Global Navigation Satellite Systems (GNSS) Division is seeking a Geodetic Orbit Scientist. The GNSS Division has responsibility for a wide range of functions and tasks which require an understanding of satellites and their characteristics (hardware and software), orbital analysis, and geodetic sciences. Current functions include producing daily precise, rapid and predicted ephemerides for GPS satellites using data from NGA and United States Air Force (USAF) ground monitoring stations, as well as daily generation of Earth Orientation Prediction Parameters (EOPP), Defense Meteorological Satellite Program (DMSP) ephemeris, and GPS precise ephemeris data for Satellite Tracking (SATRAK) as needed. The Monitor Station Network Control Center (MSNCC) has responsibility for operating a worldwide GPS monitor station network, which is controlled via the MSNCC in St. Louis, MO and Springfield, VA. Data from our monitor stations is provided near real-time to the USAF for integrity monitoring and used in updating time and position information broadcast by GPS satellites. Daily GPS data in Receiver Independent Exchange (RINEX) format is also supplied to the International GNSS (Global Navigation Satellite System) Service (IGS). GNSS also generates a daily GPS precise ephemeris in batch production mode using Estimation and Prediction of Orbits and Clocks to High Accuracy (EPOCHA) software and is currently testing and evaluating a version of EPOCHA designed to provide near real-time 5-minute GPS precise ephemeris on a 24x7 basis. Band 2 Geodetic Orbit Scientists perform fundamental assignments to monitor Global Navigation Satellite Systems (GNSS), acquire and analyze satellite data, and produce accurate products for the GEOINT Enterprise. They assist in developing, evaluating, and applying algorithms and tools to provide integrity monitoring and determine precise ephemerides and other information. They apply standard procedures and practices to analyze satellite ranging and timing information to identify anomalies in real-time and post-fit scenarios. They handle simple technical and logistical details pertinent to remote command and control of a worldwide network of satellite tracking stations. These Geodetic Orbit Scientists also collaborate with other scientists to provide customers with technical expertise on satellite issues. OTHER REQUIREMENTS: The MSNCC is monitored 24x7 and shift work/rotations, within this position, may be required. Shift rotations may be required. Weekend and Holiday shifts may be required. Occasional travel may be required. Once employed with GNSS, the employee will be deemed Emergency Essential and will not be subject to facility closures or reporting delays; employee must report for duty on time due to shift and mission requirements. Additional Application REQUIREMENT: To qualify and be selected for this job announcement you must complete one or more assessments in addition to the application you submit on this website. These assessments may include but are not limited to: 1) Online questionnaires that require you to describe your experience and/or level of expertise with mandatory or desirable job-related knowledge, skills, abilities, or other characteristics. The information you provide in the application you submit must support the response you provide to this questionnaire. 2) Additional skill-based assessments you may be asked to complete during the selection process. You will receive an email to describe any additional assessments required. Please monitor your emails and complete any required assessments as soon as possible.