ID 原文 译文
48536 机载预警雷达发射中高脉冲重复频率信号时,会导致接收杂波存在距离模糊现象。 Airborne early warning radar transmitting high pulse repetition frequency signal, can lead to receiving clutter range ambiguity phenomenon exists.
48537 对于机载非正侧视阵雷达(non-side looking airborne radar,non-SLAR),其近程回波具有强烈的距离依赖性,导致通过统计方法估计的杂波协方差矩阵不准确,使得空时自适应处理(space-time adaptive processing,STAP)的杂波抑制性能急剧下降。 For airborne is a side-view array radar (non - side & fizzy radar, the non - SLAR), its short-range echo has strong distance dependence caused by clutter covariance matrix of the statistical method is not accurate, the space-time adaptive processing (space - time the adaptive processing, STAP) of the clutter suppression performance fell sharply.
48538 接收天线为均匀线阵条件下,由于阵列没有俯仰维自由度,无法直接对近程杂波进行抑制。 Receiving antenna under the condition of uniform linear array, because array pitch d no degrees of freedom, not directly for short-range clutter suppression.
48539 针对这种情况,提出了一种近程杂波对消方法,该方法首先估计出近程模糊距离门对应的俯仰角,然后利用空时二维杂波谱的先验信息对近程的杂波进行估计,最后对原始的接收数据进行近程杂波对消。 For this kind of situation, a short-range clutter cancellation method is proposed, this method first estimate the short-range fuzzy distance pitching Angle corresponding to the door, and then use the space-time two dimensional spectrum of prior information to estimate the short-range clutter, finally receive data of original short-range clutter cancellation.
48540 该方法能够对近程杂波进行有效抑制,获得的杂波抑制性能高于直接处理法。 This method is able to short-range clutter effectively suppressed, the clutter suppression performance is higher than the direct processing method.
48541 仿真实验结果验证了该方法的有效性。 The simulation results verify the effectiveness of the method.
48542 为了提高尺度不变特征变换(scale invariant feature transform,SIFT)算法的不变性,并降低图像中存在多个相似区域时的误匹配率,提出了一种将基于局部二进制模式的中心对称的改进局部三进制模式(center-symmetric improved local ternary patterns,CS-ILTP)描述子和全局灰度值分布(global distribution of intensity,GDI)描述子相融合的局部不变特征描述算法。 In order to improve the scale invariant feature transform (scale invariant feature transform, SIFT) invariance of the algorithm, and reduce the mistake when there are multiple similar areas in the image matching ratio, this paper proposes a local binary pattern will be based on the center of the symmetrical improve local ternary patterns (center - symmetric improved local ternary patterns, CS - ILTP) descriptor and the global grey value distribution (global distribution of intensity, GDI) descriptor were described by the local invariant features of combining algorithm.
48543 通过迭代变换,使得由SIFT算法得到的初始特征点收敛到仿射不变点并得到仿射不变区域;分别提取CS-ILTP和GDI描述符,从而得到图像的局部不变特征描述。 By iterative transformation, makes initial feature points which are obtained by SIFT algorithm converges to the affine invariant point and get the affine invariant area;Extract the CS - ILTP and GDI descriptor respectively, and described by the local invariant features of the image is obtained.
48544 实验结果表明,所提算法具有高鲁棒性和独特性,相似区域和人工路标匹配中的正确匹配特征个数分别比SIFT算法增加了100%和86%以上。 Experimental results show that the proposed algorithm has high robustness and uniqueness, similar to the area and the number of artificial landmarks matching the correct matching feature respectively increased by 100% and 86% than the SIFT algorithm.
48545 高超声速飞行器具有重要战略价值,但难以进行全程和整个飞行包络的真实飞行试验,基于仿真技术进行虚拟飞行试验是其总体性能分析与验证的必要手段。 Hypersonic aircraft has important strategic value, but to the whole process and the real flight test of the whole flight envelope, based on the simulation technology for analysis and verification of the overall performance of the virtual flight test is the necessary means.