Satellite Tool Kit / Precision Orbit Determination System (STK/PODS)

PODS is a COTS software package by Van Martin Systems available as an add-on to AGI’s STK. PODS is an integrated module designed to process spacecraft tracking data and determine spacecraft orbits and related parameters. STK/PODS can process tracking data from a variety of sources, including those gathered by ground antennas (e.g., angles, range, range rate), Tracking and Data Relay Satellite System (TDRSS) data (e.g., satellite-to-satellite/ satellite-to-station relay data), and Global Positioning System (GPS) position data collected by GPS receivers. Additionally, STK/PODS now includes a Simulate Observations tool which can generate simulated tracking data between ground stations and satellites.

STK/PODS is seamlessly integrated with STK. The module uses state-of-the-art estimation algorithms to determine spacecraft orbits based on observation data from ground- and space-based sensors. STK/PODS uses an optimized Bayesian weighted least-squares estimation algorithm with high-fidelity environmental modeling to determine spacecraft orbits and related parameters. STK/PODS capabilities and associated data are implemented as extensions to the existing STK scenario, satellite, and facility object classes.

PODS is currently being used by the Landsat-7 mission and is considered a COTS alternative to stand-alone orbit determination software like GTDS. STK and PODS provide a complete flight dynamics package for both analysis and routine operations.