ID 原文 译文
49927 仿真结果表明，优化算法收敛速度快，能有效提高系统的保密传输速率。 Simulation results show that the optimization algorithm convergence speed, can effectively improve the system of security transmission rate.
49928 机载毫米波高分辨合成孔径雷达(synthetic aperture radar，SAR)对运动补偿的精度要求很高。 Airborne millimeter wave high resolution SAR (synthetic aperture radar, SAR) for motion compensation accuracy is very high.
49929 当前运动补偿算法在运动误差或斜视角大时对毫米波高分辨斜视SAR垂直航向运动误差补偿效果不明显。 The current motion compensation algorithm in motion error or of millimeter wave high resolution squint SAR with large squint Angle vertical direction movement error compensation effect is not obvious.
49930 文中提出了一种修正的垂直航向运动补偿算法，通过先补偿包络和相位，然后产生一个附加的沿航向速度，该附加沿航向速度和原始的沿航向运动误差一起补偿。 In this paper, we proposed a modified vertical heading motion compensation algorithm, through the first envelope and phase compensation, along the course of speed, then generates an additional along the course of the additional speed along the course and the original motion error compensation.
49931 毫米波高分辨斜视SAR仿真结果表明，所提方法在30°斜视角时仍能较好补偿垂直航向运动误差，补偿效果显著优于已有算法，实测数据成像结果也进一步验证了所提方法的正确性和有效性。 Millimeter wave high resolution squint SAR simulation results show that the proposed method in 30 ° Angle of vertical motion error, course can still be good compensation effect is significantly better than the existing algorithms, the measured data imaging results further verify the correctness and effectiveness of the proposed method.
49932 快速准确的载波频偏估计在突发信号的相干解调中发挥着至关重要的作用。 Fast carrier frequency offset estimation in the emergency signal coherent demodulation plays a vital role.
49933 目前的载波频偏估计算法很难同时兼顾估计精度、信噪比(signal-to-noise ratio，SNR)门限以及估计范围等指标。 The carrier frequency offset estimation algorithm is difficult to both estimation precision and signal-to-noise ratio (signal - to - noise the wire, SNR) threshold and the estimated range indicator.
49934 针对这一问题，提出了一种数据辅助的基于接收信号自相关序列离散傅里叶变换(discrete Fourier transform，DFT)的载波频偏估计算法。 In order to solve this problem, put forward a kind of auxiliary data based on the received signal autocorrelation sequence of discrete Fourier transform (discrete 'Fourier transform, the DFT) carrier frequency offset estimation algorithm.
49935 该算法通过对接收信号的自相关进行加窗处理，借助离散傅里叶变换来实现频率估计。 The algorithm based on received signal autocorrelation add window handle, with the help of discrete Fourier transform to achieve frequency estimation.
49936 仿真结果表明，与经典的M&M算法相比，该算法具有更低的信噪比工作门限，在低信噪比情况下具有更低的差错概率和更宽的估计范围，非常适合低信噪比突发信号的载波频偏估计。 Simulation results show that compared with the classical algorithm of M&M's, the proposed algorithm has lower SNR threshold, under the condition of low signal-to-noise ratio has a lower error probability and wider estimation range, very suitable for low signal-to-noise ratio of sudden signal carrier frequency offset estimation.