针对短波突发通信中存在的频偏问题，结合短波调解器的波形格式以及低信噪比的信道条件，提出了一种基于傅里叶系数插值的迭代频偏估计算法 . 该算法首先利用离散傅里叶变换（ DFT ）确定频谱峰值；然后对其结果进行 Jacobsen 插值，通过对插值结果进行误差分析，得出其方差与训练序列长度及信噪比的函数关系，并依此自适应调节其置信度为 0.99999 时的置信区间，将其作为精频偏估计的搜索区间；最后在搜索区间内进行迭代，并利用抛物线插值获取更精确的结果 . 仿真结果表明：对于长度为 128 、 256 、 512 的训练序列，在低信噪比条件下，文中算法均可逼近 Cramer-Rao 下界（ CRLB ），特别是在信噪比为 0 dB 时，两次迭代即可使算法的均方误差与 CRLB 的比值达到 1.005 左右 .

In order to overcome the frequency offset existing in short-wave （ namely high-frequency ， HF ） burst-mode communication ， an iterative frequency offset estimation algorithm on the basis of interpolation using Fourier coefficients is proposed ， which takes into consideration the waveform of HF modem under low signal-to-noise ratio （SNR）.Theproposedestimatoristackledinseveralstages.Firstly ， acoarseestimationofpeakfrequencyismade bythe application ofdiscrete Fourier transform （ DFT ） . Secondly ， Jacobsen ’ s method is used to interpolate DFT sam-ples ， and a bias analysis of the interpolating results is carried out. Then ， variance as a function of SNR and training sequence length is obtained ， and a confidence interval with a confidence coefficient of 0.99999 ， which is used as the searching interval of frequency offset estimation ， is adaptively adjusted. Finally ， a combination of parabolic interpolation is made with the iterative method to obtain an accurate result through the interval.Simulated results show that the proposed algorithm helps achieve Cramer-Rao low bound （ CRLB ） at low SNR with the training sequences equal to 128 ， 256 and 512. Especially ， at 0dB ， the estimator ’ s mean square error is about 1.005 times that of CRLB only with two iterations.