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standard reflector
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     Standard
     标准
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     Which is the standard?
     采用什么标准评价?
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     Study on Reflector-plating
     化学镀反光镜的研究
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  standard reflector
The effect of the form and dimensions of a standard reflector on the nonlinear effective scattering surface is estimated and suggestions on the technical aspect of a nonlinear standard reflector for the 10-cm band are formulated.
      
Principles of the technical aspect of a nonlinear standard reflector
      
A method of estimating the error in measuring the effective scattering surface of a target by the substitution method, resulting from the difference in the linear dimensions of the target and a standard reflector is described.
      
Here, the random surface error is defined as the error of the standard reflector in its normal direction and the errors in a small zone of the reflector are considered as equal.
      


There are many merits for focused liquid-filled spherical reflectors: email geometric size, high target strength, excellent frequency property, homogeneous directivity, low cost and easily placed in the sea. At present, the focused liquid-filled spherical reflector is a better type of all standard reflectors." This paper presents some experimental results of focused liquid-filled spherical reflector in the frequency range 120-460 kHz. The problem of raising the focusing gain in changing...

There are many merits for focused liquid-filled spherical reflectors: email geometric size, high target strength, excellent frequency property, homogeneous directivity, low cost and easily placed in the sea. At present, the focused liquid-filled spherical reflector is a better type of all standard reflectors." This paper presents some experimental results of focused liquid-filled spherical reflector in the frequency range 120-460 kHz. The problem of raising the focusing gain in changing temperature is investigated besides the relation between target strength and frequency, directivity and index of refraction. Maximum focusing gain is obtained by choosing proper proportion of liquids at different temperature. The maximum focusing gain can reach 23 decibels.

充液聚焦球形反射体具有几何尺寸小、目标强度大、频率特性好、方向性均匀、成本低、海上布设方便等优点,是目前标准反射体中较好的一种。本文介绍在120—460千赫频率范围内,对充液聚焦球形反射体的实验研究结果。除测量目标强度与频率、方位、折射率的关系外,着重研究在温度变化的情况下提高聚焦增益的问题,发现在不同温度下选择适当的球内液体比例可获得最大聚焦增益。最大聚焦增益达到23分贝。

The average power pattern of the Side-Fed Offset Cassegrain(SFOC) dual reflector antenna is analyzed,and the effect of the random surface error on radiation characteristics of the antenna is addressed.Here,the random surface error is defined as the error of the standard reflector in its normal direction and the error in a small zone of the reflector is considered as the same.We also assume that the phase error on the aperture led by the random surface error obeys the Gaussian distribution with a...

The average power pattern of the Side-Fed Offset Cassegrain(SFOC) dual reflector antenna is analyzed,and the effect of the random surface error on radiation characteristics of the antenna is addressed.Here,the random surface error is defined as the error of the standard reflector in its normal direction and the error in a small zone of the reflector is considered as the same.We also assume that the phase error on the aperture led by the random surface error obeys the Gaussian distribution with a zero mean,under which the expression for the average power pattern is deduced.Finally,the data related to the radiation characteristics of the antenna are calculated and the corresponding curves are presented.The obtained results can be used to determine the manufacturing accuracy of the antenna's reflectors.

以侧馈偏置卡塞格伦双反射面天线为对象,通过数值计算方法分析了该天线的平均功率方向图,研究了反射面随机表面误差对天线辐射特性的影响.分析过程中首先将反射面上某点的随机误差量定义为该点在标准反射面法线方向上的偏移量,并认为反射面上每一个小区域内的偏移量相同,然后在随机表面误差带来的口径相位误差服从均值为零的正态分布的条件下,推导了天线平均功率方向图的计算公式,并利用该公式模拟计算了相关的数据和曲线.文中结果可为反射面制造精度的确定提供参考.

 
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