... frequency of radio 无线电频率 frequency of ship motion 船舶运动频率 frequency of signal generator 频率信号发生器 ...
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But the line located in the low frequency of ship noise spectrum has high intensity and stability. This fact provides new idea in estimating target motion parameters.
而处于舰船噪声低频区的线谱具有很高的强度和稳定度，这一事实为估计目标运动要素提供了新的思路。
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