Configurable software defined radio system for two way time of flight ranging

Many applications rely on precise positioning. For outdoor positioning, GPS, or more generally, Global Navigation Satellite Systems (GNSS) have became a standard. On the other hand, there is no standard solution for indoor positioning. Two favored methods are mainly used. So called “WiFi fingerprinting” is based on the measurement of the received power from WiFi access points. It is interesting, because it can be easily implemented on hand-held devices, like smart phones. Due to the need of an extensive training process for building the fingerprint database and limited precision, this method has limited usability. The other group of indoor localization methods are based on Time of Flight (ToF) measurements. They have better precision, but also higher complexity. No training databases are needed. The deployment of ToF systems is usually very simple.