ID 原文 译文
9044 最后以通用倾转旋翼飞行器数学模型和飞行试验数据,对建立的数学模型进行验证。 Mathematical model in general tilt rotor aircraft and flight test data, to establish the mathematical model for validation.
9045 仿真结果表明建立的飞行动力学模型具有良好的精度,适用于飞行动力学其他问题的分析研究。 The simulation results show that flight dynamics model has good precision, applicable flight dynamics analysis and research of other problems.
9046 基于低碰撞区跳频序列的准同步跳频通信系统在低碰撞区内具有低的多址干扰。 Based on low collision zone quasi synchronous frequency hopping communication system of frequency hopping sequence in the low collision zone has a low multiple access interference.
9047 将已有的一维跳频序列低碰撞区扩展到时频二维,给出了两种构造二维时频低碰撞区跳频序列集的方法。 Existing one-dimensional low frequency hopping sequence collision zone extended frequency two-dimensional, then gives two kinds of low frequency in the two-dimensional structure method of frequency hopping sequence set collision zone.
9048 构造法分别基于Welch Costas阵列和Golomb Costas阵列,通过序列循环移位的方法分别得到一类二维时频低碰撞区跳频序列集。 Construction method respectively based on Welch Costas array and Golomb Costas array, respectively by the method of cyclic shift sequences for a two dimensional time-frequency low frequency hopping sequence set collision zone.
9049 新的序列集满足跳频序列的二维周期汉明自相关函数和互相关函数构成的理论界,同时在二维时频低碰撞区内具有最优的自相关特性和互相关特性。 New sets to satisfy frequency hopping sequences of two-dimensional periodic hamming autocorrelation function and cross correlation function of the theoretical circle, at the same time in the two-dimensional frequency low collision zone with the most optimal autocorrelation and cross-correlation properties.
9050 S变换由短时傅里叶变换发展而来,克服了短时傅里叶变换窗长固定、不能同时展现信号高频及低频的缺点,但在脉冲性较强的α稳定分布噪声下,该方法性能退化甚至失效。 S transformation by the development of the short-time Fourier transform, and overcome the short-time Fourier transform window length is fixed, not presented the disadvantages of high frequency and low frequency signal, but sex strong alpha stable distribution in pulse noise, the method performance degradation or even failure.
9051 对此,基于广义柯西分布,构造了一类可有效应用于强脉冲噪声环境的损失函数,并详细分析了其影响函数的稳健性。 To this, based on the generalized cauchy distribution, construct a class can be effectively used in strong impulse noise environment loss function, and analyzes in detail the influence function of robustness.
9052 在此基础上,根据最大似然估计理论和S变换,提出了一种稳健S变换方法。 On this basis, according to the theory of maximum likelihood estimation and S transform, this paper proposes a robust S transform method.
9053 该方法以S变换作为初始值,采用最大似然估计方法在时频域迭代得到,在保留S变换窗长选取灵活等优点的同时,进一步提高了S变换的时频聚集性。 This method takes the S transform as the initial value, using the maximum likelihood estimation in the time-frequency domain iteration, in S transform window select the advantages of flexible at the same time, further improve the S transform time-frequency clustering.