A novel distance measurement technique for indoor positioning systems based on Zadoff-Chu Sequences

A novel method for distance estimation is introduced, based on an OFDM signal combined with the Zadoff-Chu Sequences. By exploiting the properties of these sequences it is possible to evaluate the distance between a transmitter and a receiver with a very good precision and accuracy. The technique effectiveness is demonstrated in a real operating environment by measuring the distance between two active devices and using a pair of Right-Hand circularly polarized helical antennas, achieving a mean final error of 2.94 cm and a mean standard deviation of 0.95 cm with only 20 MHz of bandwidth. The proposed technique can be used in the implementation of indoor positioning systems.