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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Sea-State Observation Using Reflected BeiDou GEO Signals in Frequency Domain
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Sea-State Observation Using Reflected BeiDou GEO Signals in Frequency Domain

机译：利用北斗GEO信号进行频域海面观测

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摘要

This letter focuses on exploiting parameters, including peak power spectral density (PSD), integrated power, mean frequency, and spectrum width of reflected BeiDou signals in the frequency domain, to retrieve wind speed. The PSD of reflected signals is estimated after choosing proper parameters of the Welch method. Then, the features of PSD are illustrated, and a method is proposed based on fitting estimated PSD with a Gaussian function to evaluate the aforementioned PSD parameters. The estimated parameters of collected BeiDou medium earth orbit (MEO)/inclined geosynchronous satellite orbit (IGSO) and geostationary orbit (GEO) data are fitted with in situ wind speed using polynomial. Fitting results show that the peak PSD, mean frequency, and spectrum width of reflected signals from GEO have more evident dependence on wind speed, compared with MEO/IGSO. To obtain the most accurate results, the impact of delay used in lagging direct replica to align reflected signals is analyzed. Results show that regardless of delay locating within the interval of [τ0−τc,τ0+τc], the better root-mean-square error (rmse) of less than 1.7 m/s and the larger coefficient of determination over 0.8 can be obtained by retrieving from the spectrum width, compared with peak PSD and mean frequency, whose optimal results, with rmse values of 2.03 and 1.70 m/s and coefficient of determination values of 0.73 and 0.81, are obtained as delay is τ0−0.85τc and τ0+0.9τc, respectively, where τ0 is the delay of specular reflection, and τc is the length of the B1 code.
机译：这封信重点介绍了利用参数（包括峰值功率谱密度（PSD），积分功率，平均频率和反射的北斗信号在频域中的谱宽）来检索风速。选择合适的Welch方法参数后，可以估算反射信号的PSD。然后，说明了PSD的特征，并提出了一种基于估计的PSD与高斯函数拟合的方法，以评估上述PSD参数。使用多项式将北斗中地轨道（MEO）/倾斜地球同步卫星轨道（IGSO）和地球静止轨道（GEO）数据的估计参数与原位风速拟合。拟合结果表明，与MEO / IGSO相比，GEO反射信号的峰值PSD，平均频率和频谱宽度对风速的依赖性更大。为了获得最准确的结果，分析了延迟直接复制以对齐反射信号时使用的延迟的影响。结果表明，无论延迟位于[τ0-τc，τ0+τc]区间内，均方根误差（rmse）均小于1.7 m / s，且确定系数大于0.8通过从频谱宽度中检索，与峰值PSD和平均频率相比，由于延迟为τ0-0.85τc和τ0，因此获得了最佳结果，均方根值分别为2.03和1.70 m / s，确定系数为0.73和0.81。分别为+0.9τc，其中τ0是镜面反射的延迟，而τc是B1码的长度。

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