ID 原文 译文
14515 首先,分析了离散傅里叶变换扩频正交频分复用技术的宽带传输能力以及低峰均比特性。 Firstly，the abilityfor broadband transmission and low peak －to －average power ratio ( PAPＲ) of discrete Fourier transformspread spectrum orthogonal frequency division multiplexing technology( DFT－s－OFDM) are analyzed．
14516 其次,进行了低轨卫星运动场景下的多普勒频移及采样偏差的分析,并在此基础上提出了一种低轨宽带通信的帧结构。 Secondly，Doppler shift and sampling bias are deduced in the LEO scenario，then a physical frame is designed．
14517 仿真结果表明,该技术可有效抗低轨场景下的多普勒残留频偏且能完成高速率的传输任务。 Simulation results show that the technology can complete high speed transmission task when most Dopplerfrequency shift has been removed．
14518 针对低轨双星系统对窄带辐射源无源定位的应用场景,基于双星观测到的辐射源到达频率差,提出了一种多次频差测量联合估计辐射源位置的方法。 For the purpose of estimating location of narrowband emitter in dual satellites system，a solutionis presented for emitter location estimation using multiple frequency－difference －of －arrival ( FDOA) observed by the dual satellites．
14519 详细描述了算法原理、算法处理步骤,并通过计算机仿真分析了信号频率、频差测量误差、观测时长等因素对定位精度的影响。 Principles and process steps of the solution are described．The influence of signal frequency，FDOA measurement error and time of observing on location accuracy is analyzed throughcomputer simulation．
14520 仿真分析表明,在观测时间大于20 s、频差测量精度0.1 Hz时,该方法定位精度优于1.5 km,具有较强的工程应用价值。 Simulation results show that the location accuracy is about 1．5 km when time of observing is 20 s and FDOA measurement error is 0．1 Hz．The method has significative value of engineeringapplication
14521 针对当前室外定位基站和目标之间的信号收发不同步,以及非视距(Non-Line of Sight,NLOS)环境下定位困难的问题,提出了一种基于角度重构和差分飞行时间(Time of Flight,TOF)的室外NLOS多站定位方法。 In order to solve the problem that the signal transmission between base station and the target isnot synchronized，and the positioning is difficult in non － line of sight( NLOS) environment，an outdoorNLOS multi－station positioning method based on angle reconstruction and differential time of flight( TOF)is proposed．
14522 首先,基于单次散射模型给出了一种关于散射体波达角(Angle of Arrival,AOA)的粗略重构方法,再利用多径信号的差分TOF并结合模型中目标、散射体、基站之间的几何位置关系构建定位方程。 Firstly，a rough reconstruction method for the angle of arrival( AOA) of the scatterer based onthe single－scattering model is proposed．
14523 然后,结合先验信息添加约束区间并结合定位方程将定位问题转化为最小二乘优化问题,并利用列文伯格-马奈尔特法(Levenberg Marquardt,LM)算法进行初始解算得到基站到目标的初始估计距离。 Then，according to the constraint interval of the target．The initially－estimated distance from the basestation to the target is obtained by using the Levenberg－Marquardt( LM) algorithm．
14524 最后,将每个基站的距离估计结果进行联合多边定位得到最终目标位置。 Finally，the final targetposition can be obtained by utilizing the initially－estimated distance of each base station for multilateral positioning．