太赫兹科学与电子信息学报, 2017, 15 (2): 258, 网络出版: 2017-06-06
一种相位中心稳定的星载 GNSS掩星阵列天线设计
Design of spaceborne radio-occultation array antenna with stable phase for GNSS
工字型 圆极化 相位中心稳定度 差分进化算法 H-shape circular polarization stability of phase center differential evolution algorithm
摘要
介绍了一种适用于星载 (GNSS)掩星探测的新型阵列天线,可覆盖 GPS L1/L2和 BD2 B1/B2频段。该天线采用双层空气腔式圆极化单元,整体为变形工字型阵列形式。通过计算机仿真,并采用差分进化算法对天线单元的幅度、相位进行优化设计,展宽了阵列天线方位面波束宽度。在保证天线电性能的同时,减少了阵元数量,降低了网络设计的复杂度并减轻了天线重量。实测结果在工作频段内 10 dBic方位面波束宽度≥± 42.2°,俯仰面波束宽度≥± 6.4°,相位中心稳定度在方位±40°内最大为±1.67 mm。表明该设计在工程应用中是可行的。
Abstract
An antenna array applied to spaceborne Global Navigation Satellite System(GNSS) radio occultation has been discussed. It can cover GPS L1/L2 and BD2 B1/B2 frequency bands. The array unit is built up by double-layered air chamber circular polarized antennas. Construction of this array is formed of an H-type. Its elements amplitude and phase are optimized in the design with simulation and differential evolution algorithm, thus broadening the azimuth beamwidth,reducing the number of array and its weight, simplifying the network design without any effect on its electrical performance. As is shown in the test results, the azimuth beamwidth≥±42.2°,the elevation beamwidth of±6.4 °,phase center stability up to ±1.67 mm within ± 40 ° azimuth. Simulation and experimental results demonstrate the design is practical in engineering.
周云林, 谢欢欢. 一种相位中心稳定的星载 GNSS掩星阵列天线设计[J]. 太赫兹科学与电子信息学报, 2017, 15(2): 258. ZHOU Yunlin, XIE Huanhuan. Design of spaceborne radio-occultation array antenna with stable phase for GNSS[J]. Journal of terahertz science and electronic information technology, 2017, 15(2): 258.