2.7. 空间模型
2.7. Spatial Models
前几节讨论了多普勒频移模型和从单个分辨率单元接收到的雷达回波功率（平均值和统计起伏）。
Previous sectionshave dealt with models of Doppler shift and the received power (both mean valueand statistical fluctuations) of radar echoes from a single resolution cell.
在本节中，将考虑雷达接收到的复电压或功率随距离和角度的空间维度变化。
In this section, thevariation in received complex voltage or power as a function of the spatialdimensions of range and angle will be considered.
可以看出，观测到的复电压可以看作是线性滤波器的输出，其输入是反射率在距离或角度上的加权变化。
It will be seen thatthe observed complex voltage can be viewed as the output of a linear filterwith the weighted variation in reflectivity over range or angle as its input.
当反射率场具有随机相位变化时，同样的结果也适用于功率变化。
A similar resultholds for power when the reflectivity field has a random phase variation.
这些关系将为后续章节中的数据采样要求、距离和角度分辨率分析奠定基础。
These relationshipswill lay the groundwork for an analysis of data sampling requirements and rangeand angle resolution in subsequent chapters.
2.7.1. 相干散射
2.7.1. Coherent Scattering
考虑一部静止的脉冲雷达系统。
Consider a stationarypulsed radar.
在时间零点，发射的等效复信号为：
Attime zero it transmits the equivalent complex signal
——本文译自Mark A. Richards所著的《Fundamentals of Radar Signal Processing（Second edition）》
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