For a receiver antenna, the real target signal is basically of plane waves.

对接收天线而言，实际目标基本上是平面波。

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The magnetic field intensity function of submarine is chosen as target signal to magnetic fuze.

在此基础上，分析了典型的目标磁场信号。

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The clutter is predicted exactly and subtracted from the input signal by RLS adaptive filter, leaving components of the target signal in the residual noise.

通过RLS自适应滤波器，背景杂波分量被准确地预测并从输入信号中去除，从而只剩下目标信号与残留噪声。

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No final decisions have been made, but target letters often signal that criminal charges are in the works.

CNN: Blackwater defends team in Baghdad shootings

Described as "an electronic question and answer system", it sends a radar signal to any unidentified target to which a friendly will respond automatically with a coded reply.

BBC: NEWS | UK | No easy fix for 'friendly fire'

Far better to use a broadcast signal, which we can target at a specific star, and which moves at the speed of light.

FORBES