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| 1 | 无味卡尔曼滤波的多基线InSAR高程重建方法显示文摘针对传统的多基线InSAR高程重建方法抗噪声性能不强的问题,该文提出一种基于无味卡尔曼滤波(UKF)的多基线InSAR高程重建方法。该算法首先构造稳健的UKF高程重建系统模型,并利用具有较强噪声抑制能力的修正矩阵束模型算法提取UKF高程重建系统模型所需的干涉相位梯度估计值;其次,通过构建反映地形突变信息的残差信息矩阵,把最大似然高程估计信息融入到UKF高程观测模型中;最后,基于UKF的多基线高程重建算法采用逐行(或逐列)扫描方式进行递推估计,直至完成所有行或列的递推估计,有效提高了高程重建的精度。实验结果验证了该文方法的有效性。 | 宋明辉 谢先明 徐有邈 梁峰 曾庆宁 | 2021 | 测绘科学2021，46，12： | 1 |
| 2 | A novel unsupervised method for new word extraction显示文摘New words could benefit many NLP tasks such as sentence chunking and sentiment analysis. However, automatic new word extraction is a challenging task because new words usually have no fixed language pattern, and even appear with the new meanings of existing words. To tackle these problems, this paper proposes a novel method to extract new words. It not only considers domain specificity, but also combines with multiple statistical language knowledge. First, we perform a filtering algorithm to obtain a candidate list of new words. Then, we employ the statistical language knowledge to extract the top ranked new words. Experimental results show that our proposed method is able to extract a large number of new words both in Chinese and English corpus, and notably outperforms the state-of-the-art methods. Moreover, we also demonstrate our method increases the accuracy of Chinese word segmentation by 10% on corpus containing new words. | Lili MEI Heyan HUANG Xiaochi WEI Xianling MAO | 2016 | Science China(Information Sciences)2016，59，9： | 0 |
| 3 | 最大似然估计的改进多基线InSAR解缠算法显示文摘多基线InSAR相位解缠算法能够突破相位欠采样及相位连续性假设的问题,可获得比单基线更为精确的解缠结果,但现有的多基线相位解缠算法存在噪声鲁棒性差或运行时间长的缺点。为提升精度减少运行时间,该文提出了结合最大似然估计算法与扩展卡尔曼滤波算法的多基线相位解缠算法。该算法首先对基于最大似然估计算法重建的预估地形高程进行误差点判断,之后利用扩展卡尔曼滤波的方法对误差点高程进行重建,获得最终估计的地形高程。为验证算法的适用性,采用模拟数据和实测数据进行实验处理,以归一化均方根误差和算法运行时间作为评价指标,将此算法与最长单基线最小费用流解缠算法、最大似然估计多基线解缠算法和最大后验估计多基线解缠算法进行比较,实验结果表明该方法精度较高、运行时间较短。 | 马靓婷 卢小平 周雨石 | 2020 | 测绘科学2020，45，8： | 0 |
| 4 | A novel DEM reconstruction strategy based on multi-frequency In SAR in highly sloped terrain显示文摘Interferometric Synthetic Aperture Radar(InSAR)has been proposed as a technique for the reconstruction of the Digital Elevation Model(DEM),which is widely used in global terrain mapping mission[1].The DEM reconstruction methods of In SAR technique are usually based on the so-called phase unwrapping(PU)operation.In highly sloped terrain,the interferometric phase gradients(IPG)of the adjacent pixels are more thanπ.Therefore,the traditional PU | Tao ZENG Tiandong LIU Zegang DING Qi ZHANG Zhen WANG Teng LONG | 2017 | Science China(Information Sciences)2017，60，8： | 0 |
| 5 | Recent progress in Bistatic SAR with illuminators of opportunity显示文摘Bistatic SAR(Bi SAR)with illuminators of opportunity is a kind of flexible SAR system that consists of non-cooperative transmitters and a stationary or moving receiver,as Figure 1shows.In recent years,notable efforts have been made to promote the development of this kind of system.Progress regarding Bi SAR with navigation satellites as transmitters before 2015,including the related theory and practice,has been well reviewed by Antoniou et al.and can be referred from[1].This paper reviews some of the progress in 2015and 2016,including novel signal processing approaches,advanced Bi SAR system configurations and | ZENG Tao ZHANG Tian TIAN Wei Ming HU Cheng | 2016 | Science China(Technological Sciences)2016，59，12： | 0 |
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