채널 위상 변화량 및 잡음에 강인한 5G PRS 기반 직교 위상 도달 측위 기법 설계

초록

In this study, we propose Optimal and Robust Phase - Orthogonal Phase of Arrival Positioning Scheme (ORP-OPoAPS), a technique for improving Time of Arrival (TOA) estimation accuracy, to enhance Time Difference of Arrival (TDOA) based positioning accuracy. While existing Orthogonal Phase-of-Arrival Positioning Scheme(OPoAPS) enables precise TOA estimation by compensating for errors within samples based on orthogonal phase arrival, estimation errors occur due to phase wrap around. Therefore, in this paper, we establish mathematical conditions to prevent estimation errors caused by phase wrap-around. Additionally, the optimal number of Channel Frequency Responses(CFR) to use for TOA estimation is derived based on the Signal-to-Noise Ratio(SNR) of the CFR. The ORP-OPoAPS designed based on this improves the robustness against phase wrap around and noise suppression performance compared to the existing OPoAPS, thereby enhancing the precision of TOA estimation. Experiments conducted in a 5G signal radiation environment showed that the proposed method reduced the estimated distance error by an average of 37.44 cm compared to the existing method. This is considered a substantial performance improvement in the 5G environment, which requires positioning accuracy within 1m. ORP-OPoAPS demonstrates high TOA estimation accuracy even with low computational complexity and can be universally applied to various signal models, contributing to the performance improvement of TDOA based positioning systems.

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