天线角度的近场标校与距离的无塔校零

【作者】 李凤祥；

【导师】 陆锦辉； 王德纯；

【作者基本信息】 南京理工大学 ， 通信与电子系统， 2003， 硕士

【摘要】 雷达系统天线的角度标校包括对系统角误差灵敏度(又称定向灵敏度)的标定、方位俯仰信号交叉耦合的调整以及对天线轴系误差、动态滞后等系统误差的标定。 本文着重研究了因近场感应电压相位差引起的耦合误差，以及近场天线差斜率变化引起的定向灵敏度的变化；讨论了天线在近场并有一定仰角的条件下，随着距离的变化，系统和、差相位差、定向灵敏度与交叉耦合的变化趋势。在工程需要可以接受的前提下，提出了最近标校距离以及误差修正。 距离的校零是利用“反测法”确定设备的距离零值。笔者综合了以往的工程与理论经验，在近场条件下讨论了由馈源中心到偏馈振子的物理、几何时延，分析了近场条件对距离校零的影响，得出了令人满意的结论。更多还原

【Abstract】 Angular calibration of radar antenna system is composed of the calibration of angular error sensitivities (also called directional sensitivity), adjustment of cross-coupling of azimuth and elevation signals, and the calibrations of system errors such as antenna axial system error, dynamic delay and so on. This paper mainly studies the coupling error caused by induction voltage phase difference, and fluctuation of directional sensitivity caused by changes in near-field difference slope. The trend of system sum and difference phase difference, directional sensitivity and cross-coupling with change in distance is compared and discussed when the antenna is in the near-field and at a certain elevation. It has put forth the minimum calibration range and error correction provided it is accepted by engineering requirements.Zero-range calibration is determination of the zero range value of equipment with a "reverse-measurement method". Based on engineering experience of the author and theoretical experience, the physical and geometry delay from feed center to off-set element under near-field environment is compared and discussed, and the influence of near-field conditions on zero-range calibration is analyzed, and satisfactory results have been got.更多还原