High Resolution Delay Locked Loop for time synchronization with multi path mitigation

Accurate localization systems, based on the measurement of the time of flight of a signal between radio devices, also known as real time location systems (RTLS) are becoming increasingly important especially in indoor applications. Due to severe multi path conditions, the largest problem for those RTLS systems is to detect the time of arrival of signals traveling over the direct line of sight path. We present issues of a new high resolution delay locked loop (HRDLL) architecture that allows an efficient hardware implementation of a high resolution method for multi path mitigation, and demonstrate first results.