高动态接收机载波同步模块设计

研究高动态环境下的载波同步技术. 借鉴雷达系统中的目标建模方法，提出基于动目标模型结合卡尔曼滤波的载波跟踪器，具有较强动态跟踪能力，且结构简单，无需矩阵求逆，硬件实现复杂度低. 同时，深入探索载波捕获模块对跟踪器的辅助方案，通过理论分析与仿真结合的方式证明高动态接收机中的最优辅助方案为频偏补偿-频率变化率预置方式. 仿真结果表明，本文所提跟踪器能够在低信噪比条件下稳定工作，无论在跟踪精度或锁定概率指标上均大幅超越传统卡尔曼滤波跟踪器. 

Design of Carrier Synchronization Module Used in High-Dynamic Receivers

The carrier synchronization technique used in high-dynamic environment was studied. Learning from modeling techniques worked in radar systems, a new carrier tracker based on moving target models combined with the Kalman filter was presented, which has strong dynamic tracking capability. Both the structure and the hardware implementation are simple because it is unnecessary to calculate the matrix inversion. Besides, the auxiliary scheme between the capture module and the tracking module was investigated. Through theoretical analysis and simulation, it was proved that the optimal auxiliary method in high-dynamic receivers was the frequency-canceling-acceleration-presetting mode. Simulation results show that the proposed tracking module can work steadily in the low SNR (signal to noise ratio) circumstance and is superior to the traditional Kalman filter, in terms of the tracking accuracy and the locking probability.