【摘要】 在水下声通信中 ,收发双方相对运动产生的 Doppler效应会导致信号的伸缩 ,引起信噪比的降级 ,需要采用 Doppler补偿措施。在补偿前需要得到 Doppler估计。文中提出了一种利用 DFT进行 Doppler估计的有效算法 ,该算法通过估计频率偏移来计算 Doppler率。仿真结果验证了该算法的有效性。更多还原

【Abstract】 In underwater acoustic communication, Doppler effect, which is induced by relative motion of transmitter and receiver, can time scale the signal and degrade the SNR. So Doppler compensation need be adopted to eliminate the Doppler effect. Before it is compensated, Doppler ratio has to be estimated. The Doppler estimation algorithm proposed in this paper estimates Doppler shifts using DFT. This algorithm computes Doppler rate by estimating frequency offset. The simulation shows that the algorithm is efficient.更多还原