与射频频率相比，多普勒频移的数值较小。

The numerical valuesof Doppler shift are small compared to the RF frequencies.

表2.8给出了对应于不同雷达频率下1 m/s速度的多普勒频移大小。

Table 2.8 gives themagnitude of the Doppler shift corresponding to a velocity of 1 m/s at various radar frequencies.

Table 2.8. 速度1m/s对应的多普勒频移DopplerShift Resulting from a Velocity of 1 m/s

用L波段雷达观测到的以1马赫速度飞行的飞机，在1GHz的载波频率下，多普勒频移仅为2.27 kHz。

The Mach 1 aircraftobserved with the L band radar would cause a Doppler shift of only 2.27 kHz inthe 1 GHz carrier frequency.

对于单站雷达和恒速目标的情况，观测到的多普勒频移与雷达视线方向上的速度分量成正比，称为径向速度。

For a monostaticradar and a constant-velocity target, the observed Doppler shift isproportional to the component of velocity in the direction of the radar, calledthe radial velocity.

如果相对雷达的目标运动矢量v米每秒与从雷达到目标位置的矢量（有时称为锥角）之间的角度为ψ，则径向速度为每秒v ·cosψ米。

If the angle betweenthe velocity vector relative to the radar of a target traveling at v meters persecond and the vector from the radar position to the target position (sometimescalled the cone angle) is ψ, the radial velocity is v · cosψ meters per second.

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

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