Currently, satellite navigation mainly relies on dedicated GNSS constellations in Medium Earth Orbit (MEO). 

With the increasing demand for resilient and ubiquitous Positioning, Navigation, and Timing (PNT), several initiatives are underway to diversify the orbits and frequencies for GNSS. 

However, the rise of mega-constellations in Low Earth Orbit (LEO) for global telecommunication coverage provides another avenue for diversifying navigation signals from space without the need for additional dedicated satellites. 

The concept of Signal of Opportunity Positioning (SOOP) enables a user to determine its position based on signals not originally designed for navigation. In recent years, several initiatives in academia have successfully demonstrated the principles of SOOP from space using mega-constellations in LEO. The goal of SOPRANO (Signals of Opportunity for Ranging And NavigatiOn) is to build a receiver for such signals, develop a PVT engine, and measure the actual performance in different use cases via on the field tests.