Es与A之间的比例关系与信号的形状有关。
Theproportionality between Es and A depends on the signal shape.
对于幅度为A、持续N个采样的矩形脉冲或复指数信号，则Es = N · A2。
For a rectangular pulse or a complexexponential of amplitude A and duration N samples, it is just Es = N· A2 .
从本书第六章可以看到，当使用匹配滤波器处理时，滤波器输出的峰值SIR等于原始信号的能量SIR。
It can be seen in Chap. 6 that when matchedfilters are used, the peak SIR at the filter output is the energy SIR of theoriginal signal.
SIR以不同的方式影响雷达系统检测、跟踪和成像性能。
SIR affects detection, tracking, andimaging performance in different ways.
一般来说，检测性能随着SIR的增加而提高，因为对于给定的虚警概率PFA，检测概率PD是随着SIR增大而增大的。
In general, detection performance improveswith SIR in the sense that PDincreases for a given PFAas SIR increases.
例如，从第六章可以看到，对于特定的目标行为模型和检测算法，PD与PFA的关系为：
For instance, it will be seen in Chap. 6that for one particular model of the target behavior and detection algorithm, PDis related to PFA according to
this behavior will be demonstrated in Chap.9.
在雷达成像（第8章）中，SIR直接影响图像的对比度或动态范围（即最亮与最暗可见特征的反射率之比）。
In radar imaging (Chap. 8), SIR directlyaffects the contrast or dynamic range (ratio of reflectivity of brightest todimmest visible features) of the image.
这些因素使得最大化雷达数据的SIR是非常必要的，并且本书讨论的许多雷达信号处理都是以提高SIR为主要目标。
These considerations make it essential tomaximize the SIR of radar data, and many radar signal processing operationsdiscussed in this text have as their primary goal increasing the SIR.
本书将结合每一种具体技术来讨论实现的方法。
The ways in which this is done will bediscussed along with each technique.
1.4.2分辨率
1.4.2. Resolution
与分辨率和分辨率单元密切相关的概念将频繁出现。
The closely related concepts of resolutionand a resolution cell will arise frequently.
如果两个等强度散射体在系统输出时产生两个可分开识别的信号，而不是组合成单个未分离的输出，则认为这两个等强度散射体是可分辨的。
Two equal-strength scatterers areconsidered to be resolved if they produce two separately identifiable signalsat the system output, as opposed to combining into a single undifferentiatedoutput.
分辨率的概念被应用于距离、横向距离、多普勒频移或速度以及到达角。
The idea of resolution is applied in range,cross-range, Doppler shift or velocity, and angle of arrival.
两个散射体可以在一个维度（比如距离）内分辨，而在另一个维度（也许是速度）内无法分辨。
Two scatterers can simultaneously beresolved in one dimension, say range, and be unresolved in another, perhapsvelocity.
——本文译自Mark A. Richards所著的《Fundamentals of Radar Signal Processing（Second edition）》
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