ID 原文 译文
55998 首先,基于信号分解、超分辨以及时频分析技术,提出了一种基于多种处理算法提高逆合成孔径雷达(inverse synthetic aperture radar,ISAR)成像质量的方法;其次,重点针对目前ISAR图像难以定量评估的问题,提出了一个图像质量定量评估模型,该模型图像质量评估得分由客观评估得分和主观评估得分两部分组成,每部分又由多种评价准则组成,可以从不同方面进行详细客观评价,也给出了图像质量评估模型在实际应用中需要注意的问题;最后,仿真试验验证了模型的合理性,实测数据证明了评估模型的有效性。 First of all, based on the signal decomposition, super resolution and time-frequency analysis technology, this paper proposes a algorithm based on a variety of processing to improve inverse synthetic aperture radar (inverse synthetic aperture radar, ISAR) imaging quality method;Second, mainly based on the current problems of ISAR image is difficult to quantitative evaluation, an image quality quantitative evaluation model is put forward, the model of image quality evaluation score by the objective evaluation scores and subjective evaluation score of two parts, each part is composed of a variety of evaluation criterion, again can objective evaluation in detail from different aspects, also gives the image quality assessment model need to be aware of problems in practical application;Finally, the rationality of the model is demonstrated by the simulation test, the measured data prove the effectiveness of the evaluation model.
55999 频率源相位误差作为合成孔径雷达(synthetic aperture radar,SAR)系统的一种时间去相干因素,对不同SAR系统的成像性能影响不同。 Frequency source phase error for synthetic aperture radar (synthetic aperture radar, SAR) system of a time correlation factors of different effects on different SAR imaging performance of the system.
56000 对于低轨单基SAR系统,频率源相位误差通常可以忽略。 For Leo single-base SAR system, the frequency source phase error can usually be ignored.
56001 而地球同步轨道(geosynchronous earth orbit,GEO)SAR系统具有更长的脉冲时延和合成孔径时间,此时频率源相位误差对成像性能的影响将不能被忽略。 The geosynchronous orbit (geosynchronous earth orbit, GEO) SAR system has a longer pulse time delay and synthetic aperture time, the frequency source phase error will affect the performance of imaging can not be ignored.
56002 本文分析了频率源相位误差对GEO SAR系统成像性能的影响,并据此给出了GEO SAR系统对频率源相位特性的要求。 This paper analyzes the frequency source phase error of GEO SAR imaging performance of the system, and on the basis of GEO SAR system is given to the requirement of frequency source phase characteristic.
56003 针对因发展变化受众多因素影响而具有饱和增长趋势或单峰特性的原始波动序列,为了提高预测精度,以灰色GM(1,1)幂模型为基础,构建了自忆性原理与优化GM(1,1)幂模型的耦合预测模型,用动力系统自忆性原理来克服传统灰色模型对初值比较敏感的弱点。 For for saturated with the many factors that influence the development and change of growth or the characteristic of unimodal original sequence, in order to improve the prediction accuracy, with gray GM (1, 1) power model as the foundation, built a self-memorial principle and optimization of GM (1, 1) prediction model of coupling power model, self-memorial sex principle of power system is used to overcome the shortcoming of traditional grey model is more sensitive to initial value.
56004 结果表明,新构建模型能够充分利用系统的多个历史时次资料,模拟和预测精度都高于传统优化GM(1,1)幂模型,进一步拓展了灰色模型的应用范围。 The results show that the new building model can make full use of time when multiple historical data of the system, simulation and prediction accuracy is higher than traditional GM (1, 1) model of power, to further expand the application scope of grey model.
56005 最后,以我国高中升学率的数据为例验证了所构建模型的优越性和有效性。 Finally, China's high school graduation rates data as an example is given to demonstrate the superiority and effectiveness of the proposed model.
56006 针对网络中心化C4ISR系统结构的定量设计与分析问题,以网络中心战结构模型和观察、调整、决策以及行动(observe,orient,decide,act,OODA)过程模型为理论依据,建立了系统结构"五环"概念,采用网络化效能因子(coefficient of networked effectiveness,CNE)衡量系统结构的网络化效能,形成系统结构"五环"效能表征模型,并给出了指导网络中心化C4ISR系统结构设计的若干推论,仿真实验验证了表征模型的有效性。 For quantitative network centric C4ISR system architecture design and analysis, with structure of network centric warfare model and observation, adjust, decision and action, observe, and received, decide and act, OODA) process model as the theoretical basis, system structure is established "rings" concept, using network efficiency factor (coefficient of networked effectiveness, CNE) measuring system structure of network performance, the formation of "rings" performance characterization system structure model, and gives the guidance of network centric corollaries of C4ISR system structure design, simulation results verify the validity of the model.
56007 针对常规直接序列扩频水声通信数据传输速率低及M元扩频水声通信接收机复杂度高的问题,提出了一种正交频分复用(orthogonal frequency division multiplexing,OFDM)技术和循环移位键控(cyclic shift keying,CSK)技术相结合的调制方式,该调制能很大程度地提高系统的带宽使用率。 In view of the conventional direct sequence spread spectrum underwater acoustic communication data transmission rate is low and high M yuan spread spectrum underwater acoustic communication receiver complexity of problem, put forward a kind of orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) technology and the cyclic shift keying (CSK, cyclic shift keying) modulation technology of combining the way, the modulation can greatly improve the bandwidth utilization of the system.