ID 原文 译文
24185 仿真实验验证了理论分析的正确性以及方法的有效性。 The correctness of the theoretical derivations and the effectiveness of the approach is validated by simulation results.
24186 为了得到垂直分层大地电导率和雷电回击通道倾斜角度对雷电电磁脉冲场(LEMP)的影响规律，该文利用时域有限差分法对倾斜通道雷电电磁场进行了建模计算。 The electromagnetic fields from oblique lightning channel are studied by using FDTD and considering the effects of vertical layered ground conductivity and lightning channel tilt angle.
24187 研究结果表明，当观测点位于倾斜回击通道下方时，地表雷电电磁场峰值会随着回击通道倾斜角度的增加而出现明显的上升，同时电磁场的上升沿变得更加陡峭。 The calculation results show that the initial peak values of lightning electromagnetic fields will increase with increasing the channel tilt angle when the observation point is under the oblique lightning channel, and the rising edges of the electromagnetic fields become steeper.
24188 观测点与地表雷击点之间的水平距离越大，雷电电磁场的峰值时间也就越大。 The peak time of the lightning electromagnetic fields will be greater with greater distance between the lightning stroke point on the ground and the observation point.
24189 对地表电磁场而言，观测点同侧大地电导率主要影响雷电水平电场和角向磁场的初始峰值，而观测点另一侧大地电导率的变化则主要影响水平电场和角向磁场波尾幅值。 For the electromagnetic fields on the ground surface, the ground conductivity at the same side of the observation point affects mainly the initial peak values of the horizontal electric field and azimuthal magnetic field; the ground conductivity at the other side affects mainly the amplitudes of the wave tail of the horizontal electric field and the azimuthal magnetic field.
24190 对地下电磁场而言，增加埋地深度对垂直电场的衰减作用十分明显，而对水平电场和角向磁场来说影响极小。 For the electromagnetic fields inside the ground, the vertical electric field will decrease with increasing the underground depth, but the horizontal electric field and azimuthal magnetic field underground is basically the same as that on the ground surface.
24191 针对多运动站无源融合定位系统中的异步观测问题，该文提出一种基于空间谱分析的直接定位算法。 A Direct Position Determination (DPD) algorithm based on spatial spectrum analysis for the issue of asynchronous observation in the multiple moving sensors passive fusion location system is proposed.
24192 首先利用子空间分析理论建立异步观测直接定位模型，构造多站协同定位联合空间谱函数，采用多级搜索方法实现定位解算。 At first, a direct determination mathematical model of the asynchronous scene is constructed and a multiple sensors cooperative spatial spectrum function is composed.
24193 然后推导了该算法的定位误差协方差矩阵及克拉美罗下限。 Furthermore, the position of the emitter can be got by a two or three dimensional search, and then the derivations of the estimators' variance and the Cramer-Rao Lower Bound (CRLB) are given.
24194 最后对该算法在异步观测条件下的定位性能进行蒙特卡洛仿真。仿真结果表明算法定位精度能够逼近克拉美罗下限，定位性能优于基于定位参数的分步定位算法，尤其在低信噪比情况下优势更明显。 Finally, the Monte Carlo simulations over the asynchronous scene indicate that the accuracy of the proposed method is close to the Cramer-Rao lower bound and superior to the two-step location method based on the location parameters, especially in the low SNR.