雷达

Based on the interference characteristic, the sidelobe cancellation in time is presented and the procedure is designed, which achieves good results that the detection distances of OSMAR is increased by over 40km. At last the dissertation summarizes the application of beamforming in HFSWR, its effect and defects. 5 The dissertation discusses the application of orthogonal expansion method in HFSWR. At first, the traditional OE algorithm is introduced, and the output form is concluded. Then the dissertation discusses the influence of OE method on target signal.

首先介绍了阵列天线的方向图，接着阐述了波束形成的基本原理，然后引入了自适应波束的概念，讨论了确定权函数的准则，介绍了自适应波束形成在高频地波探海雷达中的应用和兼顾目标信号的波束形成；重点介绍了自适应旁瓣对消的原理和权系数计算方法，结合高频地波探海雷达数据特点，设计了在频域用旁瓣对消法消除射频干扰的处理过程，给出了处理结果，并对其效果进行分析，进而提出在时域进行分段旁瓣对消的新方法，设计了处理流程和计算方法，然后给出处理结果，该方法能提高OSMAR探测距离40km以上。

The noise frequency modulation signal was particularly analyzed. The Fokker-Planck equation of noise frequency modulation was presented and the Motion-Group Fourier Transform was used by converting the partial differential equation into the variable coefficient homogenous linear differential equations. Then the solutions were given by using the peano-baker series. So the probability density function of noise frequency modulation in the filter was given. On the basis of the probability density function the stochastic resonance of noise frequency modulation signal is analyzed.

首先建立了噪声调频干扰信号通过脉冲压缩雷达中频滤波器后所满足的福克尔－普朗克方程，然后利用群移傅立叶变换（Motion-Group Fourier Transform，MGFT）将此偏微分方程化成了变系数齐次线性微分方程组，并利用Peano-Baker级数法给出了该方程组的解，最后得到了噪声调频干扰信号通过脉冲压缩雷达中频滤波器后的概率密度函数，在此基础上研究了噪声调频干扰信号造成的随机共振现象。

The application of DDS in Ground Penetrating Radar is discussed in this paper.

阐述了国内外冰川探测雷达的发展，以及DDS在探地雷达中的应用发展。

Because of difficulties in making a polarimetric radar system, there is no progress in the field of radar polarimetry for a long time.

由于极化雷达设备制造难度大，所以在很长一段时间里雷达极化的发展停滞不前。

The result of this paper is popular for different kind of space-borne SAR system.

所得结果普遍适用于不同轨道和雷达参数的星载合成孔径雷达系统。

In the research, a Low noise, Wide frequency band, High speed Pre-Amplifier was made, and the dynamic range of the lidar was pressed using high speed multiplier and it give the lidar system better specification.

在激光雷达系统的研制过程中，解决了低噪声、宽频带、高速前放的研制，首次使用高速乘法器进行了动态范围压缩，改善了激光雷达系统的性能。

Another AAF radar set merits mention. This is the AN/APS-15, a 10,000 MHz precision bombing set with sector scan and PPI display.

另一种值得提及雷达的是AN/APS-15，工作在1000MHz，可以进行扇形扫描和PPI显示的精确轰炸雷达。

Preformed inserts were made of two kinds of common used materials and made in two different structures.

研究了某地面雷达天线罩所使用的含有预埋件的玻璃钢蜂窝夹层结构的强度，其中预埋件由雷达天线罩常用的两种不同材料制成，选用了两种不同的预埋件的形式。

The system chart of designing a weather radar with SZ phase code is listed, the principal and coding series of this kind of SZ phase code is illustrated.

首先给出了该方法应用到某气象雷达上所采用的系统框图；然后介绍了SZ相位编码的原理和编码序列以及基于这种编码给出了气象雷达解距离模糊算法的详细流程，并着重介绍了频谱重构的频域处理方法；最后给出了用该方法同时解出一次和二次气象回波的Matlab仿真，结果表明该方法对平均速度的估算较为准确。

The Quadrantid meteor shower and the meteor speed during the period of this meteor shower are successfully observed using the Wuhan meteor radar for the first time, and then the correlative questions of observing meteor shower using the all-sky meteor radar are also discussed.

利用武汉流星雷达，首次成功地观测了象限仪座流星雨及流星雨期间的流星速度，讨论了利用单站全天空流星雷达观测流星雨的相关问题。

I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像，后来回台湾，甚至去年在北京，居然也四处看见她的海报，才惊讶她的魅力之大。