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首页> 外文期刊>IEEE Transactions on Aerospace and Electronic Systems >Conceptual reconfigurable antenna for 35 GHz high-resolution spaceborne synthetic aperture radar
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Conceptual reconfigurable antenna for 35 GHz high-resolution spaceborne synthetic aperture radar

机译：35 GHz高分辨率星载合成孔径雷达的概念性可重新配置天线

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摘要

An innovative Cassegrain antenna for spaceborne synthetic aperture radar (SAR) utilizes a reconfigurable feed array for scene grazing angles from 15° to 70° to produce the largest antenna beam footprints that are circular and to maintain high efficiency or the transmitter. The antenna has a beam waveguide input and the feed array is located in this waveguide. The feed array of transmit-receive modules is reconfigured to vary the illumination shape and area of the radiating portion of the antenna. Each transmit device operates at its full power for maximum efficiency, and the number of devices is determined by the required power. Single-point design for a 35 GHz SAR in a 700 km altitude orbit is presented to detect terrain with 0.1 m resolution. The antenna is a 19.6 m2 elliptical reflector, the power density at the aperture is 25.5 W/m2, and 500 W maximum average power is required. Compared to X-band, 1) the 35 GHz design requires a much smaller antenna, 2) high resolution requires less percentage bandwidth, and 3) integration requirements are less demanding. For comparison, a 9 GHz SAR point design is included for grazing angles of 15° and 70°.
机译：用于星载合成孔径雷达（SAR）的创新CASEGRAIN天线利用可重新配置的饲料阵列，用于场景从15°到70°的场景放牧角度，以产生圆形的最大天线束脚印，并保持高效或发射器。天线具有光束波导输入，并且进料阵列位于该波导中。重新配置发射接收模块的馈送阵列以改变天线的辐射部分的照明形状和面积。每个发射装置以其全功率运行以获得最大效率，并且设备的数量由所需的功率确定。在700公里的高度轨道中提供35 GHz SAR的单点设计，以检测分辨率0.1米的地形。天线是19.6M2椭圆形反射器，孔处的功率密度为25.5W / m 2，并且需要最大的平均功率500W。与X波段相比，1）35 GHz设计需要一个更小的天线，2）高分辨率需要较少的带宽，3）集成要求苛刻较小。为了比较，包括在15°和70°的放牧角度包括9GHz SAR点设计。

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