Precise Point Positioning
Global Navigation Satellite System (GNSS) technology, including Global Positioning Satellite (GPS) technology pervades a multitude of devices we use in our daily lives, from single frequency navigation devices on consumer’s smart-phones to multi-frequency receivers in the nation’s critical infrastructure. Through the NOAA funded PPP SBIR project, ASTRA has demonstrated a framework for nowcasting and forecasting positioning and timing errors in single and dual-frequency GPS receivers using data from ground based GPS receivers across the US, Canada and Mexico. We have also demonstrated that Rate of TEC index (ROTI) maps can be used as a proxy for ionospheric scintillations. Shown here are ROTI and positioning error maps computed using data collected from receivers across the continental United States.
These maps quantify the positioning errors across the continental United States in real-time, while also providing a proxy measure of GNSS signal degradation as seen by ground based receivers.
Pictured is a current map of Rate of TEC Index (ROTI) measurements over CONUS for the past hour. Each data point is computed over a 10 minute window, with data being received in real-time from approximately 100 reference GNSS receivers stationed across the United States.
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ASTRA has been involved in many different science driven space missions involving SmallSats; as either the prime or support as a subcontract. If you would like to learn more about ASTRA's missions, or on how to work with ASTRA on your programs, fill out the contact form.