ID 原文 译文
48846 模型和算法在天宫一号和神舟八号发射任务中得到初步应用,效果较好。 Model and algorithm in tiangong 1 and shenzhou 8 preliminary application in the mission, the effect is better.
48847 对于短波信道传播特性的弱信号探测,信号干扰噪声比低,如何减小干扰就显得十分重要。 For shortwave channel propagation characteristics of weak signal detection, signal interference noise ratio is low, how to reduce the interference is very important.
48848 由于基于传统傅里叶变换去干扰算法在去窄带干扰时对幅度和相位的估计不够准确,提出了一种基于傅里叶变换和概率密度相结合的窄带干扰去除算法。 Because the algorithm based on traditional Fourier transform to the interference when to narrow-band interference estimate of the amplitude and phase is not accurate, is put forward based on the Fourier transform and combination of the probability density of narrowband interference removal algorithm.
48849 仿真结果表明,该算法能很好地去除窄带干扰。 The simulation results show that the proposed algorithm can well remove narrow-band interference.
48850 但上述算法在去除实测信号中的窄带干扰时性能不佳,所以提出一种改进的傅里叶变换和概率密度相结合的窄带干扰去除算法。 But the algorithm of narrowband interference in the removal of the measured signal performance is poor, so an improved Fourier transform and combination of the probability density of narrowband interference removal algorithm.
48851 实验结果表明,改进后的算法能去除实测信号中的窄带干扰,为解决低信噪比条件下探测信号的参数估计奠定了基础。 Experimental results show that the improved algorithm can remove the narrowband interference in the measured signals, to solve the problem under the condition of low SNR detection signal parameter estimation laid a solid foundation.
48852 针对欠驱动刚性航天器,提出了时间最优的闭环状态反馈控制算法。 In view of the underactuated spacecraft rigidity, put forward the time optimal closed-loop state feedback control algorithm.
48853 首先,利用直接Legendre伪谱法规划出航天器开环的姿态机动轨迹,并验证了所得最优控制输入的可行性。 First of all, the use of direct Legendre pseudo-spectral regulations in spacecraft attitude maneuver trajectory of open loop, and verifies the feasibility of the optimal control input.
48854 然后,以航天器实际运行轨迹与开环轨迹间的偏差为变量构造偏差方程,并提出了基于间接Legendre伪谱法的最优姿态稳定控制算法。 And then to actual spacecraft trajectory deviation between variables and the open-loop structure deviation equation, and based on the indirect Legendre pseudo-spectral method of optimal attitude stability control algorithm.
48855 最后,采用实时重规划策略实现了稳定控制器状态的反馈,从而完成了对参考轨迹的闭环跟踪。 Finally, using real-time planning strategy to achieve the stable state feedback controller, so as to complete the closed-loop tracking of the reference trajectory.