ID 原文 译文
23915 然而受相干斑噪声的影响，尤其是在鄱阳湖分布较广、地物背景较复杂、弱边缘和模糊边缘较多的情况下，传统的水域分割方法边缘保持性较差、提取精度较低。 However, the traditional segmentation algorithm has shortage in edge preservation and the accuracy of water detection, especially in the case of Poyang Lake, which is widely distributed and has more complex background, weak edges and blurred edges.
23916 针对上述问题，该文提出一种基于局部窄带的 ACM 边缘提取算法，并将其应用于 Sentinel-1A 获取的鄱阳湖水域时序观测图像中。 A new Active Contour Model (ACM) algorithm based on local narrowband is proposed to solve these problems, and it is applied to Sentinel-1A observations related to Poyang Lake.
23917 该算法首先采用两级 Otsu 方法获取初始轮廓，随后在初始轮廓附近建立局部窄带，最后在窄带内采用基于区域的ACM 方法进行轮廓线演化来解决弱边缘或模糊边缘问题。 First, a cascade two-level Otsu approach is adopted to obtain the initial contour. Second, the local narrowband is built along the initial contour to reduce the calculating time. Finally, a region-based ACM is introduced into the local narrowband to stop the contours at weak or blurred edges.
23918 实验结果表明该方法在边缘保持和分割精度上具有明显优势，并且降低了计算时间。 Experiment results show that the new method has advantages in the edge preservation and obtains better segmentation results with respect to other methods.
23919 利用毫米波线性调频连续波(LFMCW)雷达探测水面时，静止目标的回波以及噪声通常会淹没水面本身的回波信号，导致采用传统成像算法得到的结果中难以看到水面波浪纹理。 In the application of millimeter-wave Linear Frequency Modulated Continuous Wave (LFMCW) radar for water surface detection, the echo of water surface itself is always covered by the echo of stationary targets and noises, leading to the result that water surface texture can hardly be seen in the figures obtained by the conventional imaging algorithm.
23920 针对这一问题，该文提出一种面向水面纹理的毫米波 LFMCW 雷达成像算法，该算法在距离向上采用 Dechirp 技术进行距离压缩，在方位向上进行分块处理。 To solve this problem, an imaging algorithm of millimeter-wave LFMCW radar for water surface texture is proposed, the Dechirp technique is adopted to complete the range compression in range direction, and the data is divided into blocks to be dealt with separately in azimuth direction.
23921 方位向分块处理过程中，首先根据静止目标与运动目标回波多普勒频率不同的特性，在频域去除静止目标回波的干扰； During the processing in azimuth direction, interference from static targets is removed in frequency domain according to the fact that stationary targets and moving targets have different Doppler frequencies;
23922 然后基于水面电磁散射特性，采用最大似然估计方法估计方位向频谱参数，计算水面回波能量。 then, based on the electromagnetic scattering characteristic of water surface, a maximum likelihood estimation method is used to estimate azimuth spectrum parameters to calculate the energy of water surface echo.
23923 采用该算法对实测数据进行处理，结果显示该算法能够获得水面纹理信息，成像结果优于传统成像算法。 The proposed algorithm is used to process measured data, and the results show that water surface texture can be obtained, which means that the proposed algorithm is superior to the traditional one.
23924 在非均匀环境下，针对传统样本挑选、样本加权等方法由于数据利用率低导致独立同分布训练样本不足的问题。 The conventional statistical Space-Time Adaptive Processing (STAP) methods, such as sample selection and sample weighting methods, and so forth, have a very low utilization ratio of sample data, which results in that the problem of training samples lack is more prominent in heterogeneous clutter environment.