FIR-Based Ranging Method for OFDM Communication Systems of Networking UAVs

摘要

Unmanned aerial vehicles (UAVs) have tremendous potential in both military and civilian applications. Orthogonal Frequency Division Multiplexing (OFDM) is an effective solution to reliable communication among networking UAVs due to its high spectral efficiency and robustness against frequency selective fading. In this paper, we firstly overview the positioning methods employed in common UAV telemetry systems and study the ranging methods in OFDM communication systems. Then, we propose a Finite Impulse Response (FIR)-based ranging method for networking UAVs by the joint time and frequency domains time estimations in OFDM receiver. The theoretical performance of the proposed method is finally presented with Cramer-Rao Bound (CRB) as a comparison. Results show that, the ranging performance of the designed method will get close to CRB with increasing symbol length used for the joint estimation.