如果雷达只发送和接收垂直电磁波分量,那么雷达散射截面σ与S的关系为

If the radar transmitted and received, say,only the vertical component, then the RCS σ would be related to S by

雷达可以用来测量整个复PSM矩阵。

Radars can be designed to measure the fullcomplex PSM.

其它设计测量的是PSM元素的幅度,而不是相位,或者是两个PSM元素的大小。

Other designs measure the magnitudes butnot the phases of the elements of the PSM, or the magnitudes of two of the PSMelements.

这些极化测量可用于多种目标分析的目的。

These polarimetric measurements can be usedfor a variety of target analysis purposes.

然而,极化技术的讨论超出了本书的研究范围。

However, a discussion of polarimetrictechniques is beyond the scope of this book.

假设只发射一种固定极化,并接收到这种固定极化,从而可以用标量而不是矩阵来描述RCS。

Henceforth, it will be assumed that only asingle fixed polarization is transmitted and a single fixed polarizationreceived, and consequently that RCS is described by a scalar, rather thanmatrix, function.

读者可以参考Holm(1987)和Mott (1986)的著作来讨论极化雷达和极化信号处理。

The reader is referred to the works by Holm(1987) and Mott (1986) for discussions of polarimetric radars and polarimetricsignal processing.

感兴趣目标的典型RCS值范围为0.01 m2(相对于1 m2目标为–20 dB,或–20 dBsm)到数百平方米(≥+20 dBsm)。

Typical values of RCS for targets ofinterest range from 0.01 m2(–20 dB withrespect to 1 m2, or –20 dBsm) tohundreds of square meters (≥ +20 dBsm).

Both larger andsmaller values are also observed.(省略)

表2.1列出了各种类型目标的代表性RCS值。

Table 2.1 lists representative RCS valuesfor various types of targets.

Table2.1. 微波频率下的典型RCS值Typical RCS Values at MicrowaveFrequencies

——本文译自Mark A. Richards所著的《Fundamentals of Radar Signal Processing(Second edition)》