Then it introduces some classical arithmetic of audio information hiding, such as Least Significant Bit, Phase Coding, Echo hiding. And we use them in our system to realize covert communication.
然后介绍了几种经典的音频信息隐藏算法，如最不重要位，相位编码和回声编码，并且将它们用在我们这套系统中实现了隐秘通信。
These signals provide an important reference of the gain of antenna, the time reference, the phase reference and the frequency of carrier wave for generating stimulant echo signal.
这些信号分别为模拟回波信号的生成提供了天线增益大小、时间基准、相位基准和载波频率大小等重要的参考信息。
PGA algorithm based on radar echo signal is one method of estimating and correcting phase error in time domain, and its algorithm is simple to use.
基于雷达回波信号的PGA算法是在时域估计和校正系统相位误差的一种方法，算法较简单。
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