ID 原文 译文
20785 在发射端，发送M/P长度混沌序列，复制P次后作为参考信号，所有用户共用同一参考信号，信息信号延迟不同的时间来区分用户。 At the transmitter, M/P chaotic samples are transmitted and then duplicated P times as a reference signal, all users share the same reference signal, and information signals are delayed by different times to distinguish different users.
20786 在接收端，将接收到的信号通过滑动平均滤波器平均，再与其不同时间延迟后的信号进行相关。 At the receiver, the received signal is averaged by a moving average filter, and thenthe resultant filtered signal is correlated to different time-delated replica.
20787 该方案通过降低噪声项的方差来提高系统误码性能。 The scheme can enhance theperformance of BER by reducing the variance of noise terms in the system.
20788 文中推导了该方案在加性高斯白噪声(AWGN)信道和Rayleigh信道下的理论误码率公式并进行了蒙特卡洛仿真。 The theoretical BER formula of thisnew scheme is derived in Additive White Gaussian Noise (AWGN) channel and Rayleigh channel.
20789 理论分析和仿真结果表明，理论公式与仿真结果能较好地吻合，MU-NRDCSK方案能较好地提高系统误码性能，在混沌通信领域具有很好的发展前景与研究价值。 Theoretical analysis and the simulation results show that the theoretical formula and the simulation result are in good agreement. The MU-NRDCSK scheme can enhance the performance of BER better and has good developmentprospects and research value in the chaotic communication field.
20790 针对传统方法无法估计电磁波在植被中的穿透深度导致植被数字表面模型(DSM)反演误差较大的问题，该文提出一种高精度DSM估计方法。 The general method for inversion of Digital Surface Model (DSM) in forest region has great errorsdue to the inestimable waves’ penetration depth. For this problem, an approach to inversion of high-precisionDSM is proposed.
20791 该方法首先通过极化干涉相干最优中最大化相位差法分离得到电磁波在植被中高、低散射相位中心的干涉相位。 First, the phases of high and low scattering phase centers of the waves in forest are obtainedby maximizing the phase separation of the coherence optimization.
20792 然后提出一种归一化高、低散射相位中心高度随消光系数变化的模型，基于该模型搜索得到电磁波在植被中的最浅穿透深度。 Then, the normal height variation models ofthe high and low scattering centers with extinction factors are constructed. According to the models, the leastpenetration depth of the waves in forest is acquired.
20793 最后利用干涉处理方法得到高散射相位中心的高程，将最浅穿透深度补偿到该高程中，从而提升植被区DSM估计精度。 Eventually, by implementing the interferometric technique on the phase of high scattering phase center, a coarse DSM is retrieved, and a high-precision DSM is developed by compensating the least penetration depth to the coarse one.
20794 利用PolSARpro软件在不同植被种类和不同植被高度下进行仿真试验以及机载全极化数据进行实测数据试验，试验结果表明该方法能有效提高植被区DSM反演精度。 The validation of the method is investigated by simulated datasets of PolSARpro under different tree species and different forest heights and by airborne real datasets. It shows that the proposed method can improve the accuracy on the inversion of DSM effectively inforest region.