Sub-GHz Phase-Based Ranging System: Implementation and Evaluation

A prototype phase-detection ranging system based on the automotive remote/tele-control narrowband ARIB STDT108 standard and operating in the sub-GHz band is designed, built, and evaluated. The prototype uses a pair of transceivers operating asynchronously. Problems with the frequency offset and initial phase are overcome by using an exchange sequence. The prototype employing 5.6MHz bandwidth achieves a distance error of 0.09 m under ideal environments without multipath and 0.88 m in outdoor conditions within the range of 6.0 m × 6.0 m area.