ID 原文 译文
47816 对于高频雷达系统,通常很难找到一段连续可用的寂静频带,为了获得大的距离分辨带宽,可以离散地利用多段可用频带。 For high frequency radar system, it is often hard to find a continuously available silence band, in order to obtain larger distance resolution bandwidth, discrete can use more available frequency band.
47817 然而,信号频谱的离散性会造成较高的距离旁瓣。 Discrete signal spectrum, however, will cause the high range sidelobe.
47818 所研究的全随机跳频脉冲信号,通过控制不同频率脉冲出现的概率可以获得较低的距离旁瓣。 Research by the random frequency hopping pulse signal, by controlling the probability of different frequency pulse appears low range sidelobe can be obtained.
47819 研究了全随机跳频脉冲信号自相关函数的统计特性,并给出了可用频带连续及非连续两种情况下的信号设计方法。 Studied the random jumping frequency pulse signal and the statistical properties of the autocorrelation function of the available frequency band is also given continuous and discontinuous signal design method of two kinds of circumstances.
47820 临近空间伪卫星的定位精度与其几何布局有密切关系。 Near space pseudolite positioning accuracy is closely related with its geometric layout.
47821 为了提高伪卫星的定位精度,在研究现有伪卫星几何布局方案的基础上,提出了一组新的伪卫星布局方案。 In order to improve the positioning accuracy of pseudolite, based on the study of the existing pseudolite geometric layout scheme, a new set of pseudolite layout scheme is presented.
47822 首先,在研究卫星数目与几何精度因子(geometric dilution of precision,GDOP)关系的基础上,确定了6颗伪卫星独立组网定位的设计方案;然后,分析了伪卫星的高度角和方位角对GDOP的影响,设计了基于临近空间飞艇的6颗伪卫星布局新方案。 First of all, the research on satellite number and geometric dilution of precision (geometric dilution of precision, GDOP) relationship, on the basis of identified six pseudo satellite independent network localization design;Then, the paper analyzes the pseudo satellite altitude Angle and azimuth of GDOP, the influence of design based on the near space airship 6 pseudo satellite new layout scheme.
47823 最后,将提出的伪卫星布局新方案与现有的布局方案进行仿真验证和比较。 Finally, the proposed pseudolite new layout scheme and simulation validation and comparison are made on the existing layout scheme.
47824 结果表明,提出的新方案不但增加了用户的定位区域范围,而且在定位区域内减小了GDOP,提高了定位精度。 Results show that the proposed new scheme not only increase the user's location area, and reduced the GDOP in the area of the positioning, the positioning precision is improved.
47825 反推滑模变结构控制是当前不确定非线性系统鲁棒控制理论和应用的前沿课题之一,在提高、改善控制系统过渡过程品质和鲁棒性等方面表现出较大潜力,尤其在航空航天等高技术领域有着广阔的应用前景。 Backstepping sliding mode variable structure control is the current uncertain nonlinear system robust control theory and application, one of the frontier issues in improving, improve quality control system in the transition process and robustness etc showed great potential, especially in high technology fields of aeronautics and astronautics has a broad application prospect.