A Novel Positioning Method based on Leaky Coaxial Cable using TC-OFDM Signal

The positioning methods based on leaky coaxial cable (LCX) are receiving more and more attention in recent years. In the positioning methods based on LCX, the positioning method based on radio frequency (RF) fingerprint has poor positioning accuracy due to the influence of environmental noise, multi-point-coupling and other factors. The positioning method based on time difference of arrival (TDOA) has high positioning accuracy, but the signal model of this method is lack of theoretical research, and using OFDM signal as positioning signal will occupy the resource of communication signal. In order to improve the positioning accuracy and solve the problem of resource occupation, this paper introduces a novel positioning method based on LCX uses time & code division-orthogonal frequency division multiplexing (TC-OFDM) signal. Firstly, this paper deduces the signal model of the TC-OFDM signal passing through the LCX. Next, the simulation of acquisition phase and tracking phase are carried out. The simulation results show that when the signal-to-noise ratio (SNR) is -20dB, the TC-OFDM signal passing through the LCX can still maintain good positioning performance. Thirdly, dynamic positioning experiments are carried out. The experimental results show that 87% of the positioning results have errors of less than 1m. Finally, this paper summarizes the research content and put forward the future research direction.