窄带

D dissertation. Based on GPS C/A code signal structure and performance characteristics, traits of aiming interference and jammer are analyzed. The best interference way is that wideband interference of uniform spectrum is made from wideband saw tooth frequency modulation and narrowband frequency modulation.

根据GPS的易受干扰的C/A码信号的特点，分析了对GPS的C/A码的瞄准式干扰、阻塞式干扰及相关干扰的特性，分析得知对GPS的C/A码的最佳干扰是锯齿宽带调频和噪声窄带调频相结合的均匀频谱宽带干扰。

GHz ridge－loaded helical groove slow wave structure with a 20kV electron beam are given and the investigations of the effect of the ridge dimensions and electron beam parameters on the small signal gain are carried out. It is indicated from the calculation results that this type of structure is suitable for use as s SWS of high power, high gain but narrow passband millimeter TWT, of which the 3dB gain bandwidth is 3.4%. In order to increase the bandwidth, the reduction of the ridge gap or the increase of the electron beam current in an allowable range may be useful.

GHz的脊棱加载慢波结构的具体尺寸，并对此结构中小信号增益随脊尺寸的变化情况及电子注参数对其影响进行了研究，计算结果表明：此结构适宜于作为高增益窄带毫米波大功率行波管的慢波线，其3dB增益带宽为3.4%，为了展宽其工作带宽，可以适当减小间隙宽度，也可在一定范围内提高电子注电流。

Apply to such as narrow-band filters, SAW devices, amplifiers, attenuators, and other necessary measurement of transmission characteristics of devices and components.

适用于在对于诸如窄带滤波器、声表面波器件、放大器、衰减器等其他需要测量传输特性的器件和部件。

Flat feet: low arch; leaves an imprint that looks like the whole sole of the foot.

高足弓脚：连接前脚和脚跟的印记是一个窄带。

However, the fine structure of high resolution spectrum in a narrow bandwidth is required in some applications.

在一些应用中，需要了解的仅仅是某一窄带内的频谱精细结构，要求频谱的分辨率较高。

The design principle of the laser receiver with wide FOV for the laser command guidance and laser-beam riding guidance is introduced. A mathematic model of receiving light field is presented. The formula for the viewing angle of the detecting optical system was derived according to the diffraction light field of the oblique incidence parallel light. Taking a detecting optical system with the collecting objective for example, the design characteristic that the receiving optical system needs not only an extra large relative aperture but also an unvignetting receiving performance is discussed on the premise of meeting the requirement of 1064nm WFOV laser receiver.

介绍激光指令制导和激光驾束制导的大视场激光接收机的设计原理，给出接收光场的数学模型，由斜入射平行光的衍射光场推出探测光学系统的视场角公式，根据1064nm大视场激光接收机技术要求，以聚光物镜型探测光学系统为例，探讨接收光学系统既须具备特大相对孔径，又须具备无晕接收性能的设计特点，采用窄带干涉滤光镜进行光学滤波降噪。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。