ID 原文 译文
38716 仿真结果表明,该算法的估计效果优于一种新的卡尔曼滤波算法。 The simulation results show that the proposed algorithm estimates of the effect is better than a new kalman filtering algorithm.
38717 最后,研究分析了系统压缩量、数据包接收概率和时窗长度对所提算法估计性能的影响。 Finally, the research analyzes the compression ratio, packet receiving probability and the time window length affect the performance of the proposed algorithm estimates.
38718 在系统不确定性和丢包概率未知的情况下,适当增加时窗长度可以提高算法估计性能。 The system uncertainties and packet loss probability under the condition of unknown, appropriate increase length of time window can significantly improve the estimation performance of the algorithm.
38719 为解决基于时频脊线的跳频参数估计算法在信噪比低于-5dB时估计误差较大且存在定频干扰时方法失效的问题,提出了该算法的改进算法。 To solve the problem based on the time-frequency ridge line frequency hopping parameter estimation algorithm of below 5 db SNR estimation when there is a fixed frequency interference and error method, solve the problem of the algorithm of the improved algorithm is proposed.
38720 在短时傅里叶变换(short time Fourier transform,STFT)的基础上,利用迭代去噪法对原时频图进行去噪处理,根据跳频信号与定频干扰驻留时间的不同,采用k-means算法对其进行聚类,消除定频干扰并提取其时频脊线,利用Haar小波对提取到的时频脊线进行奇异点检测,并估计出跳频信号的跳频周期、起跳时间和跳频频率。 In the short time Fourier transform (short time Fourier transform, STFT), on the basis of using iterative denoising method to deal with the noise of the original time-frequency diagram, according to the frequency hopping signals with fixed frequency jamming dwell time is different, the k - means algorithm for clustering, and eliminate the fixed frequency interference and extract the frequency ridge line at that time, and using Haar wavelet to the extraction of the time-frequency ridge line for singularity detection, and to estimate the frequency hopping frequency hopping signal cycle, jump jump time and frequency.
38721 仿真结果表明,所提算法在信噪比低于-5dB且存在较强定频干扰的情况下,仍能对跳频参数进行正确估计,且优于原有算法。 The simulation results show that the proposed algorithm in signal-to-noise ratio less than 5 db and the presence of strong fixed frequency interference, can still to correct estimation of parameters of frequency hopping, and better than the original algorithm.
38722 目前已有的动力学模型无法准确描述大排量滑翔机的动力学特征,而常规控制器针对滑翔机大时滞强耦合系统控制效果并不理想。 The existing dynamic model can't accurately describe the dynamic characteristics of large displacement glider, and conventional controller for glider control effect is not ideal for strong coupling systems with time delay.
38723 针对上述问题,综合考虑浮力驱动机构中内外油囊的质量和质心位置矢量变化,建立了大排量滑翔机的双质点变质量变位置矢量模型。 According to the above problem, considering buoyancy driving mechanism in the internal and external quality of the oil sac and centroid position vector change, the establishment of a large displacement glider double particle metamorphic quantitative change position vector model.
38724 在建模的基础上,通过考虑扰动和实际工作特性,对滑翔机俯仰角和速度回路进行了比例-积分-微分(proportional-integral-derivative,PID)控制器和抗扰控制算法设计对比实验。 On the basis of the modeling, by considering the disturbance and the actual operating characteristics, on the glider pitching Angle and speed loop proportional integral differential proportional - integral - derivative (PID) controller and the immunity control algorithm design experiments.
38725 结果表明,自抗扰控制器控制精度更高、响应速度更快、超调更小,滑翔机灵活性更高、续航更长。 The results show that adrc higher control accuracy and response speed faster, smaller overshoot, glider higher flexibility, long life.