共查询到19条相似文献,搜索用时 78 毫秒
1.
固态有源相控阵天线多阶振幅量化及副瓣特性的研究 总被引:11,自引:1,他引:11
本文研究了多阶振幅量化二维低副瓣固态有源相控阵天线的口径设计方法,结果表明,这种方法能够有效地降低固态有源相控阵的峰值副瓣电平,并且可适且于任意复杂口径天线。另外,对于随机幅相误差和单元(或T/R组件)失而引起的增益损失及峰值副瓣电平恶化也进行了分析。 相似文献
2.
讨论了大型圆口径低副瓣CINRAD天线测试场的设计原则。提出了大型圆口径低副瓣天线最小测试距离条件,即R≥4D~2/λ(R为测试距离,D为待测天线口径,λ为工作波长),并研究了当满足不同锥削幅度准则时,天线的最小架设高度。 相似文献
3.
4.
5.
针对机载X 波段圆口径相控阵天线,文中提出了五种典型子阵划分方法,以解决相控阵天线瞬时宽带工作时宽角扫描波束色散的难题,同时,实现指向角偏差、第一副瓣电平、增益、平均副瓣电平、最大副瓣电平等典型参数性能最优化;在仿真分析基础上,总结了子阵划分方法与天线性能之间对应关系。 相似文献
6.
发明背景 1.发明的范围本发明阐述能有选择地抑制副瓣的天线装置,重点研究这样的天线装置,它的主天线包括主反射器和馈电嗽叭,而副瓣抑制装置有两种。(1)至少有两个辅助天线,每个辅助天线包括一个预定口径的反射器和馈电喇叭。这个喇叭发射的信号和主天线发射的相同,且具有合适的幅度和相位。辅助天线配置在主天线两侧的对应边上,在被抑制副瓣的平面内其距离近似等于主天线口径的边缘之距。(2)主天线 相似文献
7.
随着干扰与抗干扰技术的发展,要求雷达和地面站有较高的信噪比和抗干扰的能力,因此需要降低天线的副瓣。目前,用得较多的方法有两种: 1.保证反射器口径面上的相位分布,控制口径面上的幅度分布,降低天线的边缘照射电平。如对圆口径反射器实现低副瓣哈敏照射分布,则天线副瓣可降低至-40分贝以下。但是它的主波束展宽,增益下降。要实现原增益,必须加大天线口径,并提高反射器表面的制造精度。此法在多数场合是可以应用的。 2.采用接收对消技术。这可由图1来说明。图中①为主信号,②为补充信号,③为差异信号。由选通电路产生的信号使主天线主瓣区接收信号时,才将信号送往显示器,反之截止。这种方法在雷达机中得 相似文献
8.
极低副瓣天线远场测量的新方法 总被引:3,自引:1,他引:2
测试极低副瓣天线时,要求测量距离远远大于2L^2/λ,其中L为天线口径尺度,λ为工作波长。为了解决现有远场测试场地测量极低副瓣天线所遇到的测试距离不够的问题,本文提出了一种远场测量修正方法。对在费涅耳区测量的天线波瓣图进行修正,可以获得被测天线的远场波瓣图。对极低副瓣线阵天线的计算机模拟计算表明,该方法是有效的,可以获得满意的校正效果。 相似文献
9.
10.
本文论述了一种多阶振幅量化二维固态有源相控阵天线获得低副瓣的口径设计方法,这种方法可适用于任意复杂口径天线,另外,对于由随机幅相误差和单元(或(T/R)组件)失效而引起的幅瓣电平恶化和增益下降也进行了分析。 相似文献
11.
An aperture design technique using multi-step amplitude quantization for two-dimensional solid-state active phased arrays to achieve low sidelobe is described. It can be applied to antennas with arbitrary complex aperture. Also, the gain drop and sidelobe degradation due to random amplitude and phase errors and element (or T/R module) failures are investigated. 相似文献
12.
For conformal phased arrays, generally the excitation amplitude of the array elements must be adjusted in order to maintain low sidelobes as the array is scanned. While the desired phase weights for maximum gain are deterministically set by the array geometry and scan angle, the representation of optimum low sidelobe amplitude weights remains an open problem. Following up on prior work using the efficiency-constrained optimization of a modified Bernstein polynomial for low sidelobe conformal array synthesis, a Be/spl acute/zier surface is shown to provide a good representation of the optimized amplitude weights with a reduced number of parameters, while demonstrating /spl epsiv/-constraint multi-objective optimization of conformal aperture efficiency versus sidelobe level. These results are extended to include a Be/spl acute/zier volume representation for the multiobjective optimization of conformal aperture efficiency versus both sidelobe level and scan angle. 相似文献
13.
本文提出了一种带平台多阶振幅量化的低副瓣口径设计方法并论述了其分析方法和计算公式,给出了本文算法与作者(1993)提出的多阶振幅量化方法在峰值副瓣电平、口径效率、归一化输入功率以及具有容差情况下的副瓣恶化等的计算比较结果。结果表明,在相同的条件下,本文提出的方法优于多阶振幅量化方法。 相似文献
14.
Uniformly excited arrays of identical elements suffer from high close-in sidelobes. Suppression of sidelobe levels can be achieved by tapering the aperture amplitude distribution, but a more complex feed network results. A novel form of amplitude tapering is described, in which element pattern control in uniformly excited arrays is shown to theoretically reduce close-in sidelobe levels. 相似文献
15.
Satisfactory sum or shaped antenna radiation patterns can often be synthesized by modifying just the phase distribution of an initial excitation by an arbitrary amplitude distribution. As examples, we calculate linear and circular apertures with uniform, Taylor, or cosine-section amplitude distributions, affording symmetric sum patterns with low sidelobe levels or symmetric shaped patterns with low ripple and sidelobe levels; linear aperture distributions, affording patterns with low sidelobe levels on one side of the beam; and planar arrays, with uniform or cosine-section amplitude distributions affording φ-symmetric or elongated-oval footprints 相似文献
16.
A low sidelobe aperture design method of multi-step amplitude quantization with pedestal is proposed, and general analysis and formulas are described. The computation results compared with our previous method "Multi-Step Amplitude Quantization(MSAQ)" on peak side-lobe level, aperture efficiency, normalized input power and sidelobe degradation with tolerance are given. It is shown that, under the same conditions, the method presented in this paper is better than the MSAQ. 相似文献
17.
Two applications of an iterative procedure to establish a means of optimizing theoretical low sidelobe antenna patterns are discussed. Examples described consider discrete element linear array antennas where the parameters involved in the optimization process are coefficients ordinarily associated with continuous aperture illuminations. One application uses the iterative procedure to control far-out sidelobe levels of the far-field pattern to establish array element excitations appropriate for low sidelobe behavior throughout the entire visible region of space. The other application uses the procedure to establish beam port amplitude weightings at a minimum number of beam ports in a multibeam feed network also suitable for low sidelobe antenna pattern behavior. 相似文献
18.
Sidelobes control of solid-state array antennas 总被引:6,自引:0,他引:6
An aperture design is described for two-dimensional (2-D) solid-state phased arrays that transmits low sidelobes. A five-step amplitude distribution for the aperture was optimized by a gradient search method to achieve -36-dB peak sidelobes. The optimized configuration was applied to a sample array of 36 columns by 14 rows, with 400 modules divided into five groups of power levels. The array performance with the actual module lattice structure taken into account is discussed. Gain drop and sidelobe degradations due to random amplitude and phase errors are also studied 相似文献
19.
本文提出了一种用于机载有源相控阵具有指数约束的二维可分离多阶振幅量化低副瓣口径设计技术,它能有效地降低水平面和非主平面的峰值副瓣电平并能减少T/R组件的品种数,采用二维可分离的设计思想,在工程应用中可大大地减少列馈网络的品种数,计算机仿真计算结果证明了本文的理论分析。 相似文献