Terra: DIY Land-Based GPS
Terra is a platform for using signals of opportunity (SOOPs) for navigation. A network of reference receivers track signals from SOOPs like FM radio stations, and make timing information for those signals available online. Then, anyone with a radio and a network connection can use that timing information to determine their location, just as if those signals were coming from GPS satellites.
If you are interested in hosting a reference receiver, please reach out to us at contact@terra-rnt.com.
Boston Demo Testing with FM Radio Stations
The Terra-Receiver software is designed to use widely available software defined radios like Ettus USRPs, LimeSDR, and PlutoSDR. The software is designed to be hardware-agnostic, but the radio needs at least 4MHz to pick up enough stations to solve for its location. On the demo page, a a 3.2MSa/s recording with an RTL-SDR is just enough to work.