ID 原文 译文
48806 基于辨识理论提出了全捷联导引头刻度尺偏差的辨识方法。 Was put forward based on identification theory of strapdown seeker scale identification method of deviation.
48807 研究表明,刻度尺偏差会恶化全捷联制导系统稳定性,增加需用末导时间,利用辨识方法可准确辨识出导引头刻度尺偏差予以补偿。 Research shows that scale deviation will deteriorate the strapdown guidance system stability, increase need a guide at the end of the time, using the identification method can accurately identify the seeker scale deviation shall be compensated.
48808 研究结论可为全捷联制导设计提供参考和帮助。 Research conclusion can provide reference for whole design of strapdown guidance and help.
48809 对于正交频分复用(orthogonal frequency division multiplexing,OFDM)水声通信系统,频域最小二乘(least square,LS)信道估计算法受噪声影响较大,离散傅里叶变换(discrete Fourier transform,DFT)插值算法引入了由于空载波所产生的误差。 For orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) underwater acoustic communication system, frequency domain least squares (further square, LS channel estimation algorithm are greatly influenced by noise, discrete Fourier transform (discrete 'Fourier transform, the DFT) interpolation algorithm is introduced due to the error generated by the air carrier.
48810 针对上述问题,提出了一种LS-DFT信道估计算法,先对导频子载波进行LS信道估计,再通过DFT作降噪处理,然后通过误差对比和数据替换,得到一组新的导频信道估值,最后通过线性插值获得数据子载波处的信道估值。 Aiming at these problems, this paper proposes a LS - DFT channel estimation algorithm, first to the LS channel estimation of pilot sub-carrier, then by DFT for noise reduction processing, and then through the comparison and error data, get a new set of pilot channel valuation, the data is acquired by linear interpolation subcarrier channel valuations.
48811 理论分析和仿真结果均表明,该算法能以较小的复杂度有效提升系统的性能。 Theoretical analysis and simulation results show that the proposed algorithm can effectively improve the system performance with small complexity.
48812 针对直升机载旋转式合成孔径雷达(rotating synthetic aperture radar,ROSAR)方位向分辨率依赖于重构角度大小,大重构角时传统子孔径处理带来的孔径损失导致方位向分辨率降低的问题,使用高阶逼近模型建立了ROSAR的回波信号模型,结合级数反演的思想推导出了其精确的二维频谱表达式。 For helicopter rotary synthetic aperture radar (rotating synthetic aperture radar, ROSAR) azimuth resolution to rely on refactoring Angle size, large Angle of reconstructing the traditional subaperture processing of aperture loss results in the decrease of azimuth resolution to the problem, using high order approximation model established ROSAR echo signal model, combined with series of inversion thought its accurate two-dimensional spectrum equation is deduced.
48813 在此基础上,提出一种适合高分辨ROSAR的成像算法,并对相应的参数选择和性能进行了分析。 On this basis, put forward a kind of suitable for high resolution ROSAR imaging algorithm, and the corresponding parameter selection and performance are analyzed.
48814 最后,仿真结果验证了分析结论的正确性和算法的有效性。 Finally, the simulation results verify the correctness of the conclusion and effectiveness of the algorithm.
48815 复杂系统仿真模型的互操作和可重用性是仿真技术研究的热点和难点之一,主流仿真技术高层体系结构由于联邦对象模型以及运行支撑框架(runtime infrastructure,RTI)版本的限制也遇到了很大的挑战。 Complex interoperability and reusability of the simulation model is one of the hot spot and the difficulty of simulation technology research, mainstream simulation high level architecture as the federal object model and operation support frame (the runtime infrastructure, RTI) version of the restrictions also had a lot of challenges.