ID |
原文 |
译文 |
26615 |
全景相机在直升机桨毂上的安装无特殊要求,通过变换标定块位置,可实现旋翼任意位置的共锥度计算,与以前测量方法相比具有很大的灵活性。 |
Panoramic camera installed on the helicopter hub with no special requirements, by varying calibration block position, which can realize to calculate the total taper rotor at any position compared with the previous measurement has a great deal of flexibility. |
26616 |
实验结果表明,此方法误差在±5mm以内。 |
The experimental results show that this method error is within + / - 5 mm. |
26617 |
数据包络分析(data envelopment analysis,DEA)方法与偏序集理论之间关系密切,通过引入适当的偏序关系可以进一步刻画决策单元,也能够更加深入地理解决策单元。 |
, data envelopment analysis (data envelopment analysis (DEA) method and the close relation between poset theory and by introducing the appropriate partial order relation can be further depict decision-making unit, also can more in-depth understanding of decision making units. |
26618 |
在Charnes-Cooper-Rhoes(C2 R)模型中引入新的偏序关系,通过该偏序关系给出DEA有效决策单元、弱有效决策单元及无效决策单元与偏序集的极大元的特殊关系,同时从偏序集中的极大元出发提供决策单元在生产前沿面上的投影。 |
In Charnes Cooper - Rhoes (C2 R) model is introduced in the new partial order relation, DEA effective decision making units is given by the partial order relation, the weak effective decision-making units and ineffective decision making units with partial order set the maximal element of special relationship, based on the maximal element from a partial order set at the same time provide decision-making unit in the projection on the surface of the production frontier. |
26619 |
最后,为了较简单地确定各个决策单元之间的偏序关系,对C2 R模型中的投入产出数据进行无量纲化及统一化处理,并对这些理论的进一步应用和发展提出了一些建议和设想。 |
Finally, in order to more easily determine the partial order relation between all the decision-making units, the C2 R model of input and output data of dimensionless and unification, and for the further application and development of these theories put forward some Suggestions and ideas. |
26620 |
在正交频分复用(orthogonal frequency division multiplexing,OFDM)系统接收端,错误估计快速傅里叶变换窗口起始点会导致OFDM帧偏差,从而造成严重的符号间干扰(inter symbol interference,ISI)以及子载波间干扰(inter carrier interference,ICI)。 |
In orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) system, the receiver error estimation fast Fourier transform window starting point will lead to OFDM frame deviation, thus causing severe intersymbol interference (Intel symbol interference, ISI) and the intercarrier interference (Intel carrier interference, ICI). |
26621 |
首先建立一个带有帧同步的OFDM系统模型,然后通过理论推导得到帧偏差对OFDM系统的影响。 |
First with a frame synchronization of the OFDM system model is established, then the frame is obtained by theoretical derivation deviation affect OFDM systems. |
26622 |
利用伪随机序列自身较好的相关特性,设计了一种基于伪随机序列前导码的帧同步算法,并分析了3种基于循环前缀(cyclic prefix,CP)的传统帧同步算法。 |
Using pseudo random sequence itself better related features, designs a frame synchronization algorithm based on pseudo-random sequence lead code, and analyzes the three based on cyclic prefix (cyclic prefix, CP) of traditional frame synchronization algorithm. |
26623 |
通过仿真实验,结果表明所提出的基于伪随机序列前导码的帧同步算法与传统算法相比,即使在较差的信道条件下,如在较低的信噪比或存在较大的载波频率偏移(carrier frequency offset,CFO)时,其帧偏差估计结果更为准确、稳定以及节省资源。 |
Through simulation experiments, the results show that the proposed frame synchronization algorithm based on pseudo-random sequence lead code is compared with the traditional algorithm, even in a poor channel conditions, such as exist in low signal-to-noise ratio or large carrier frequency offset (carrier frequency offset, CFO), its frame estimate result more accurate, stable and save resources. |
26624 |
结合干涉雷达的天线结构和二维波达方向(direction of arrival,DOA)估计方法,提出一种基于二维干涉式幅相估计的分布式相参阵盲DOA估计算法。 |
Combined with interference radar antenna structure and 2-d DOA (direction of concatenated, DOA) estimation method, put forward a kind of based on two-dimensional distributed parameter array of interferometric phase estimation blind DOA estimation algorithm. |