一个著名的例子是乔治亚理工学院（GTRI）模型：
One well-knownexample is the Georgia Tech Research Institute (GTRI) model given by
其中σh为表面粗糙度的均方根，参数A、B、C、D取决于杂波类型和雷达频率。
where σhis the RMS surface roughness and the parameters A, B, C, and D depend on theclutter type and radar frequency.
表2.6给出了X波段的样本值。
Sample values for Xband are given in Table 2.6.
Table 2.6. X波段雷达的GTRI陆地杂波模型参数GTRILand Clutter Model Parameters for X Band
对于海杂波的σ0也存在类似的模型。
Models of a similarspirit exist for sea clutter σ0 .
除频率、掠射角和极化外，海杂波反射率的重要参数包括相对于雷达视线角度的风速风向、波浪高度和多径现象。
Important parametersfor sea clutter reflectivity in addition to frequency, grazing angle, andpolarization include wind speed and direction relative to the radar boresight,wave height, and multipath.
在GTRI开发的一个代表性模型的细节在Currie（2010）中给出。
Details of onerepresentative model developed at GTRI are given in Currie (2010).
2.3.2. 信杂比
2.3.2. Signal-to-ClutterRatio
在许多情况下，主要的干扰不是噪声，而是杂波。
In many scenarios,the dominant interference is not noise, but clutter.
因此，信杂比（SCR）通常比信噪比（SNR）更为重要。
Consequently, thesignal-to-clutter ratio (SCR) is often of more importance than thesignal-to-noise ratio (SNR).
对于体杂波、波束限制面杂波和脉冲限制面杂波情况，可以通过式（2.11）给出的接收目标功率与式（2.25）、（2.30）或（2.32）给出的接收杂波功率之比得出SCR。
The SCR is easilyobtained as the ratio of the received target power, given by Eq. (2.11) to thereceived clutter power, given by Eq. (2.25), (2.30), or (2.32) for the volumeclutter, beam-limited area clutter, and pulse-limited area clutter cases,respectively.
最后得出的表达式为：
The resultingequations are
在以上各种情况下，诸如发射功率和天线增益等系统参数都被抵消了。
In each case, suchsystem parameters as the transmitted power and the antenna gain cancel out.
这是因为杂波和目标信号都是雷达发射脉冲的回波；功率或天线增益的增加会同时增大两种回波的强度。
This occurs becauseboth the clutter and target signals are echoes of the radar pulse; increasingpower or antenna gain increases the strength of both types of echoes equally.
因此，SCR只是目标RCS与导致杂波的总RCS之比。
Thus, the SCR justbecomes the ratio of the target RCS to the total RCS of the contributingclutter.
——本文译自Mark A. Richards所著的《Fundamentals of Radar Signal Processing（Second edition）》
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