两参数PDF

Two-parameter PDFs

2m自由度的中心chi分布

Central chi of degree2m

Weinstock RCS模型的等效电压分布。

Voltage equivalent ofWeinstock RCS models.

Rice或Rician，2自由度的非中心chi-square分布

Rice or Rician,noncentral chi-square of degree 2

威布尔函数

Weibull

对数正态函数

Log-normal

其它更多的信息请参考附录A。

Additionalinformation is given in App. A.

如前所述，复杂目标的雷达散射截面随发射频率和视线角的变化而变化。

As has been seen, theRCS of a complex target varies with both transmitted frequency and aspectangle.

目标属性的另一个重要特征是时间、频率和角度上的去相关间隔。

Another importantcharacteristic of a target's signature is the decorrelation interval in time,frequency, and angle.

这是指使得回波幅度不相关到某种指定程度所需的时间、频率或角度范围。

This is the change intime, frequency, or angle required to cause the echo amplitude to decorrelateto a specified degree.

如果一个刚性目标（如建筑物）被一系列相同的雷达脉冲照射，并且雷达和目标之间没有运动，人们期望从每个脉冲的回波中接收到相同的复合电压y（忽略接收机噪声）。

If a rigid targetsuch as a building is illuminated with a series of identical radar pulses andthere is no motion between the radar and target, one expects the same receivedcomplex voltage y from each pulse (ignoring receiver noise).

然而，如果允许两者之间存在运动关系，雷达和包含目标的各种散射体之间的相对路径长度将发生变化，从而导致复合回波的幅度发生波动，如图2.9所示。

If motion between thetwo is allowed, however, the relative path length between the radar and thevarious scatterers comprising the target will change, causing the compositeecho amplitude to fluctuate as in Fig. 2.9.

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

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