ID 原文 译文
13624 同时该算法在更新字典的过程中, 仅选取置信区域中的链路参与计算, 这样既加速了字典学习过程, 提高了算法实时性, 又滤除了野值链路的影响。 In the process of updating the dictionary, the algorithm not only reduces the dictionary dimension to speed up the dictionary learning process and improve the realtime computing speed of the algorithm, but also filters out the outlier links by selecting those links through the confidence region.
13625 室内外实验结果表明, 该方法可以有效地消除现有基于阴影模型字典所带来的模型误差, 提高定位精度, 同时具有运算速度快的优点。 The indoor and outdoor experimental results show that the proposed method can effectively mitigate the model error and improve the positioning accuracy with the low computational complexity.
13626 为了测量频率步进脉冲信号的功率值, 需要将已有的脉冲测量技术加以改进。 In order to measure the power of the stepped-frequency pulse signal, the existing pulse measurement techniques need to be improved.
13627 以频谱仪为测量工具, 分别采用谱线法和包络法测量信号功率, 为避免使用脉冲退敏因子, 提出了一种更为快捷的测量方法。 Using the spectrum analyzer as a measurement tool, the power of the signal is measured by the spectral line method and the envelope method respectively. To avoid the use of pulse desensitization factor, a more rapid measurement method is proposed.
13628 不同测量方法下的最大误差仅为1.08dB。 The maximum error under different methods is only 1.08 dB.
13629 测量结果表明, 新方法能以较快的速度在大的带宽范围内获得准确的脉冲信号功率值。 The power measurement results show that the new method can rapidly get the accurate pulse power value in a large bandwidth range.
13630 利用微波在对流层的散射现象进行电磁侦测是实现超视距雷达辐射源探测的有效手段之一。 Over-the-horizon (OTH) reconnaissance of radiation sources as radar can be realized by the troposcatter propagation of microwave signals.
13631 随着探测威力、分辨力要求的提高, 对于散射多径引起的衰落相关导致接收协方差矩阵秩亏损, 令多重信号分类 (multiple signal classification, MUSIC) 等基于特征分解的超分辨类测向算法失效, 以及散射机制下大型分布式源产生的相位扩散导致接收阵列流形失配等问题。 With the improving requirements of the detection coverage and resolution, the dependence among received covariance matrix caused by the troposcatter multipath fading correlation, and the receiving array manifold mismatch caused by the huge distributed scattering source are two inevitable problems.
13632 文章根据近期建立的散射衰落相关模型设计相互独立的多波束排布, 并相应地提出一种修正的线性约束最小方差 (linearly constrained minimum variance, LCMV) 方法补偿相位扩散影响, 将接收信号由受衰落相关影响的阵元域变换到独立的波束域, 并在波束域进行超分辨测向。 Therefore, this paper firstly provides a mutual independent multibeams arrangement according to an recently established troposcatter fading correlation model, and then proposes a modified linearly constrained minimum variance (LCMV) to compensate the diffusion phases within the array manifold, transforms the received snaps to the mutual independent beamspace and finally a beamspace direction-of-arrival (DOA) estimation method is conducted respectively.
13633 仿真结果验证了测向算法在散射多径衰落条件下的有效性, 对600km目标散射信号积累300快拍能达到0.5°的估角精度. The proposed beamspace DOA estimation method is verified by the simulation results under the troposcatter multipath fading conditions.