ID	原文	译文
1603	因此如何设计出一种高效的扩容方案越来越受到科研人员的关注。	There-fore, how to design a fast and efficient scaling scheme is getting more and more attention from researchers.
1604	本文根据研究对象的不同将 RAID 扩容方案分为:基于块存储、对象存储、文件系统存储的扩容方案，	According to the different investigative object, this paper classifies RAID scaling approaches into basing on block, object and file system.
1605	同时根据 RAID 扩容方案研究历程和优化策略的不同，又可分为优化数据迁移过程和减少数据迁移量的扩容方案。	Meanwhile, according to the investigative developing process and different optimization strategies of RAID scaling, the ap-proaches also can divide into optimizing data migration process and reducing the number of data to be moved.
1606	文章结合不同的应用场景介绍了典型和常见的扩容方案，并从评价扩容方案性能各项重要指标的角度详细分析了现有的RAID 扩容方案，并指出各种扩容方案的不足以及未来可能的发展方向。	From the per-spective of evaluating the performance of the scaling schemes, this article introduces the typical and common scaling schemesby different application scenarios that points out the shortcomings of various scaling schemes and possible improvements.
1607	如何权衡影响扩容方案性能的各项因素，设计出数据迁移少，负载均衡好，扩容开销低的高效扩容方案，将会是今后相当长一段时间海量数据存储研究的热点问题。	How to balance the factors that affect the performance of the scaling schemes and design a high-performance scaling scheme with less data migration, good load balance, and low scaling cost, which will be a hot issue for massive data storage researchfor a long time in the future.
1608	现有直接定位(Direct Position Determination，DPD)算法主要研究对象是视距目标。	Direct Position Determination (DPD)algorithms usually focus on line-of-sight target.
1609	针对传统无线电定位技术对超视距目标定位精度低的问题，提出一种辐射源信号波形已知的超视距直接定位(Over-the-Horizon Direct Posi-tion Determination，ODPD)方法。	Aiming at the prob-lems that traditional radio positioning technology is suboptimal, especially in the over-the-horizon target localization, this pa-per proposes an Over-the-horizon Direct Positioning Determination (ODPD)method with known radiation source wave-forms.
1610	该方法基于电离层电子密度参数，依据最大似然(Maximum Likelihood，ML)准则，从信号数据域直接推导出仅关于目标位置的代价函数。	Based on the ionospheric electron density parameter, the cost function just about the target position is directly derivedfrom the signal data domain through the Maximum Likelihood (ML)criterion.
1611	其次，本文推导了关于电离层虚高测量误差的定位误差协方差矩阵。	Furthermore, this paper deduces the positio-ning error covariance matrix considering the measurement error of the ionospheric virtual height.
1612	实验表明 ODPD 方法在低信噪比下相比现有算法，能显著提高超视距目标的定位精度，定位性能更接近克拉美罗界(Cramér-Rao Low Bound，CRLB)。	Experiments show thatcompared with the existing algorithms, the ODPD method can significantly improve the positioning accuracy of the over-the-horizon target at low SNR. The ODPD positioning performance is closer to the Cramér-Rao low bound (CRLB).