提出了一种频差估计的新算法，该算法结合观测序列的周期图和自相关函数进行频率估值。
A simple algorithm for frequency offset estimation is proposed, which estimates the frequency offset with the periodogram and the correlation function of the observation samples.
修正后的信号强度和频率估值有相当高的精度。
After correction, the estimates of signal amplitude and frequency have high accuracy.
测试结果表明：估值器的频率分辨率和幅值稳定性较高，能满足工程计算的要求。
The test result shows that the estimator can satisfy the engineering requirement of frequency distinguishability and amplitude stability.
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