高动态DS/FH信号的载波捕获技术研究

Study of carrier capture for high dynamic DS/FH signals

针对高动态跳频信号的载波同步技术问题,提出一种混合域联合估计算法,包括基于时域的扩展卡尔曼滤波和基于频域的FFT算法。理论研究和仿真结果表明:直扩载波捕获可以在一个跳频时隙内完成,继而引导跳频端同步跟跳,满足系统要求。

The main reason is its complex Doppler shift under high dynamic characteristics. For the carrier synchronization problem of high dynamic frequency hopping signals, a mixed-domain joint estimation algorithm has been proposed. The algorithm consists of the extended Kalman filter based on the time domain and FFT algorithm based on frequency domain. The theoretical studies and simulation results show that DS carrier capture can be done in the time slot of a frequency hopping,and then guide the hopping side to synchronize with the jump,which meet the system requirements.