查询词典 range estimation

The main contents is: analyzing some detection method to moving target nowadays; particular studying the principle of detection moving target in SAR; analyzing SAR imaging theory and the echo model of moving target; discussing conventional SAR imaging , the movements of target cause the changes of doppler mass center and regulable frequency, and the changes cause effect the imaging result; introducing the estimation method of doppler parameter; analyzing theory of DPCA, derivating the formula needed, and validating it's validity and practicability through simulation; advancing the improved DPCA algorithm that combine the advantage of DPCA and ATI, and validating it through computer simulation; using the revision algorithm to range ambulate based on keystone transformation, and validating it through computer simulation; discussing the compensation art of SAR imaging.

主要内容有：分析了现有的一些动目标的检测方法；详细研究了SAR动目标检测的原理；分析了SAR成像理论和运动目标的回波模型；探讨常规SAR成像时，目标运动引起的多普勒质心和调频率变化，以及这些变化对成像结果的影响；介绍了多普勒参数的估计方法；分析了DPCA原理，推导所需要的基本公式，并仿真验证其有效性和实用性；提出了结合DPCA和ATI优点的改进DPCA算法，并仿真验证；探讨了SAR成像中的运动补偿技术。通过对仿真结果的分析，本文提出的方法具有一定的指导意义和参考价值。

But in the case of long-range acoustic communications in shallow water it is disturbed by severe multipaths whid produce increased inter-symbol interference. So the error of frequency estimation for the week signals is bigger and the BER becomes larger.

但是，用于浅海远程水声通信时，由于多径传播的影响，导致严重的码间干扰，使得远程微弱信号的频率估计产生较大偏差，误码率显著增加。

Firstly, this paper discusses the parameters of disquisitive status about innovation diffusion models and extends their range from the simple estimation to the economic meanings, the influence factors and the characters.

首先对技术创新扩散模型的参数研究情况进行了评述，在此基础上，将技术创新扩散模型参数的研究范围由单一的估计扩展到讨论参数的经济含义、参数的影响因素及特性，再进行有效测度研究的领域。

WebArray incorporates these packages and provides a user-friendly interface for accessing a wide range of key functions of limma and others, such as spot quality weight, background correction, graphical plotting, normalization, linear modeling, empirical bayes statistical analysis, false discovery rate estimation, chromosomal mapping for genome comparison.

WebArray合并了这些包并提供了一个用户友好的界面进行访问limma和其他的各种不同的关键函数，例如点质量权重，背景校正，图形绘制，归一化，线性建模，经验贝叶斯统计分析，错误发现率评估，基因组比较的染色体mapping。

Aiming at the influence of the target movement acquired by the frequency-modulated stepping radar on composite range profiles, a fast velocity estimation method is proposed.

针对调频步进雷达目标运动对合成距离像的影响，提出了一种快速的速度估计方法。

At first, the initial values of motion vectors of blocks in the face area can be found by calculating the 2D parameters of general head motion. With the initial values, the range of further search in motion estimation can be reduced, and the results are consistent with the actual motion.

首先提出一种通过求出脸部区的二维全局运动参数来求各像块的运动矢量初值的方法，在得到各像块的运动矢量初值后，搜索范围可以很小，搜索到的精确的运动矢量更符合真实运动。

Compared with the single-bounded questionnaire format, the double-bounded questionnaire format could obtain more information about the respondents' willingness to pay, hence, it reduces the confidence interval range and improves the estimation accuracy of the greatest willingness to pay. At the pilot practice for three continuous years, the percent of banana windstorm insurance pilot size in the total banana planting area was less than 10% in Hainan. Combined with this research result, the author holds that Hainan finance should strength the subsidy to banana windstorm insurance on the basis of 30% subsidy in two continuous years of 2007 and 2008, and the subsidy percentage should try to achieve 40%. At the same time, the premium rate should not be too low, 18% is suitable.

与单边界问卷格式相比，双边界问卷格式能够获得被调查者支付意愿的更多信息，从而缩小了估计的置信区间，提高了最大支付意愿的估计精度；在连续3年的试点实践中，海南香蕉风灾保险试点规模占其香蕉种植面积不足10%，结合本研究结果，笔者认为海南省财政应在2007、2008连续两年30%的财政补贴基础上进一步加大对香蕉风灾保险业的补贴力度，力争补贴比例达到40%左右，同时费率也不宜过低，宜保持在18%左右。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。