HIGH-PRECISION CLOCK RECOVERY BASED ON OOK

This paper proposes a high-precision clock recovery method for the pseudo code ranging system based on the direct sequence spread spectrum OOK system. The delay phase-locked tracking loop (DDL) is used to track and lock the received pseudo code signal and restore the clock information, and then we can complete the clock information conversion through calculations. The results of FPGA simulation and verification show that the clock recovered by the method at receiver in the optical fiber or wireless remote terminal has small transient deviation and high frequency stability. It can provide a stable reference clock for each station in the entire system and eliminate the clock uncertainty between different base stations.