共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
本文将对日本的相控阵研究活动以及已经开发出的相控阵系统作一评述。文中还将讨论用于波束形成网络的两种基本技术;一种是使用单片微波集成电路的微波处理技术,另一种是光学处理技术。文中还将对采用光学元器件的几种光学控制相控阵天线作一描述。作为市售系统,文中还将介绍用于INMARSAT-M上的机载相控阵天线和Shinkansen火车上的波束开关天线。 相似文献
3.
相控阵天线是天线领域的重要课题,其波束快速灵活的优点命名其得到了广泛的应用。相控阵天线能极其迅速地改变波束的指向,关键在于相控阵天线每个单元的电调移相器。而如何控制移相器的配相方法使得天线获得最佳的性能就成为实际应用中必须研究的课题。 相似文献
4.
5.
工作在毫米波估的机载高分辨率和高灵敏度的辐射仪系统有望应用于高性能全天候地面警戒和侦察。这个系统使用了能产生N个垂直飞行方向观察波束的平面相控阵天线。这样,N个波束可依次观测一个目标,并且这个系统可以有很大的带宽。 相似文献
6.
在简要介绍微波相控阵天线基本特性的基础上,详细介绍了用于微波相控阵天线的光子实时时延(TTD)波束形成网络及其性能特点. 相似文献
7.
叙述了在密度加权相控上进行的随机馈相和波束置零实验,得到了随机馈相抑制副瓣电平的结果,指出了副瓣电平抑制量与扫描角位置和移相器位数有关,证实了用相位加权置零实数算法在最大幅瓣处置零可以很好地抑制该副瓣的电平,在波束其它方向置零效果也很好。 相似文献
8.
相控阵天线数字波束形成浅述 总被引:3,自引:0,他引:3
用模拟技术形成的波束的缺点主要是旁瓣电平高,稳定性差,更重要的是对有源干扰无自适应能力。针对上述问题,本文重点讨论数字波束形成的原理和实现的方法。 相似文献
9.
10.
11.
Microwave signals for all array elements in a phared array microwave antenna are simultaneously generated by spatial sampling of a moving sinusoidal interference pattern formed between two frequency-offset injection-locked laser diodes. The offset and radar frequency of 3.2 GHz were generated by a Bragg cell. A nearly distortionless antenna beam pattern and 180° steering are demonstrated in a linear seven-element array. 相似文献
12.
Optical phased array technology 总被引:16,自引:0,他引:16
McManamon P.F. Dorschner T.A. Corkum D.L. Friedman L.J. Hobbs D.S. Holz M. Liberman S. Nguyen H.Q. Resler D.P. Sharp R.C. Watson E.A. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1996,84(2):268-298
Optical phased arrays represent an enabling new technology that makes possible simple affordable, lightweight, optical sensors offering very precise stabilization, random-access pointing programmable multiple simultaneous beams, a dynamic focus/defocus capability, and moderate to excellent optical power handling capability. These new arrays steer or otherwise operate on an already formed beam. A phase profile is imposed on an optical beam as it is either transmitted through or reflected from the phase shifter array. The imposed phase profile steers, focuses, fans out, or corrects phase aberrations on the beam. The array of optical phase shifters is realized through lithographic patterning of an electrical addressing network on the superstrate of a liquid crystal waveplate. Refractive index changes sufficiently large to realize full-wave differential phase shifts can be effected using low (<10 V) voltages applied to the liquid crystal phase plate electrodes. High efficiency large-angle steering with phased arrays requires phase shifter spacing on the order of a wavelength or less; consequently addressing issues make 1-D optical arrays much more practical than 2-D arrays. Orthogonal oriented 1-D phased arrays are used to deflect a beam in both dimensions. Optical phased arrays with apertures on the order of 4 cm by 4 cm have been fabricated for steering green, red, 1.06 μm, and 10.6 μm radiation. System concepts that include a passive acquisition sensor as well as a laser radar are presented 相似文献
13.
借鉴微波相控阵雷达技术,有的放矢加快探测型激光相控阵雷达的技术发展与应用,从仿学微波相控阵雷达发射天线基础知识入手,提出微波相控阵雷达发射天线与光纤激光相控阵发射天线可比较的部分技术参数;分析了光纤激光相控阵发射天线的技术要点与潜在能力,并立足现有研发水平对其系统功能与规模进行了预测;尝试对光纤激光相控阵与微波相控阵天线的技术特点与面临主要问题进行了论述;提出两者体系内互相配置,不仅有助于提高微波相控阵雷达在复杂电磁环境下对中近程高速、隐身和多目标的探测、识别与定位能力;同时也可适当减少激光相控阵对目标大范围区域搜索的压力的观点。 相似文献
14.
The tracking error of a phased array antenna between transmitting and receiving frequencies was measured by in-flight experiments using a geostationary satellite. The tracking error was found to depend on beam-scanning angle and the ratio of transmitting and receiving frequencies. Measured results agreed well with a theoretical prediction. An effective method to eliminate the tracking error is proposed 相似文献
15.
以平面相控阵天线为研究对象,在给出阵面天线方向图函数模型的基础上,详细描述了波控码的计算方法;分析了波束控制的系统架构,提出了查表法与分布式计算相结合的波控码计算方法,阐述了其软件处理流程,并与传统方法对比分析了该方法的技术优势.通过对阵面天线方向图的仿真分析,该方法可以控制波束指向,实现一维扫描与二维扫描、单向扫描与... 相似文献
16.
The first microwave phased array antenna steered by optical delay lines is presented. Delay times specified by the antenna steering angle were implemented by switching bias currents of high speed lasers pigtailed to the fibre optic delay lines. No beam squint was observed in the radiation pattern of the antenna as its frequency was switched from the L- to the X-band.<> 相似文献
17.
Krairiksh M. Ngamjanyaporn P. Kessuwan C. 《Microwave and Wireless Components Letters, IEEE》2002,12(5):184-186
This paper presents a flat four-beam compact phased array antenna. The low-cost and compact phased array antenna is designed using a circular array of four circular microstrip antennas made of low-cost material and four 1-bit phase shifters. The main beam of the antenna can be switched in four directions with the gain of about 4 dBi in each main-beam direction. More than 90° half-power beamwidth and over 10 dB F/B ratio are obtained. In addition, the diversity performance is considered and the diversity performance of this antenna can be provided with the envelope correlation about 0.6 相似文献
18.
19.