无线电波的三要素是幅度、频率、相位,他们之间互相影响。理想情况下,固定频率的无线信号波动周期是固定的,在频谱宽度接近0时,频域内的一个脉冲信号在时域内是一定频率的正弦波。但实际情况是信号总会存在一定的频谱宽度、随机的不理想的幅度和相位的波动,而且由于噪声的影响,偏离中心频率的很远处也有该信号的功率,这个偏离的信号叫做边带信号,也叫相位噪声。相位噪声在没有选件的情况下,如何测试呢?The three elements of radio waves are amplitude, frequency, and phase, which affect each other. In an ideal situation, the fluctuation period of a fixed frequency wireless signal is fixed. When the spectrum width approaches 0, a pulse signal in the frequency domain is a sine wave of a certain frequency in the time domain. But the actual situation is that the signal always has a certain spectral width, random and imperfect amplitude and phase fluctuations, and due to the influence of noise, there is also the power of the signal far away from the center frequency. This deviated signal is called sideband signal, also known as phase noise. How to test phase noise without options?
- 10 ай бұрын
信号最重要的指标是这个!频谱分析仪测试相位噪声方法Method for testing phase noise in spectrum analyzers
- Рет қаралды 294
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