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本文着重介绍全晶体管化X波段地面散射计的设计、结构与性能指标.该散射计采用连续波调频体制,收发天线平行安装.架设高度为8～12m,在方位角0～330°,俯仰角0～85°范围内,能以四种极化状态(HH、VV、VH、HV)测量地面及海面目标的后向散射系数σ°.整个系统由高频部件与控制机箱两部分组成,由多芯电缆将它们连接起来.校正是用测量一个已知雷达横截面的金属球完成的.从1981年秋季起,用该散射计测试了水稻、小麦、淡水、柏油路面、混凝土跑道、海面风场、草地等目标.本文给出其中两个测试结果.
This article focuses on the design, structure and performance of all-transistorized X-band terrestrial scatterometer. The scatterometer adopts continuous-wave frequency modulation system with parallel receiving and transmitting antennas. The erection height is 8 ~ 12m and the azimuth angle is 0 ~ 330 °, The backscatter coefficient σ ° of ground and sea surface can be measured in four kinds of polarization state (HH, VV, VH, HV) within the range of 0 ~ 85 °. The whole system is composed of high frequency parts and control cabinet, Multi-core cables connect them. The calibration is done with metal balls measuring a cross-section of a known radar. With this scatterometer, rice, wheat, fresh water, asphalt pavement, concrete runways, Field, grassland and other goals.This paper gives two of the test results.