摘要信号调制就是用一个信号(调制信号)去控制另一个作为载体的信号(载波信号),让后者的某一参数(幅值、频率、相位、脉冲宽度等)按前者的值变化。信号调制是雷达和通信的基本组成,本文具体分析和仿真了中频的调频和调相。 毕业论文首先讨论并仿真了几种常见的基本波形,包括正弦波、三角波、锯齿波和方波等;接着具体理论分析了常见波形调频和调相时域和频域波形,主要包括正弦波调频、锯齿波调频、对称方波调相和伪随机编码调相等,matlab仿真给出了相应调频和调相的时域波形和频谱,并进一步讨论调制信号波形参数对频谱结构的影响。20264
关键词 信号调制 调频 调相
毕业设计说明书(论文)外文摘要
Title Generating phase modulation signal with the IF FM
Abstract
Signal is modulated with a signal (modulated signal) to control the other as the carrier signal (carrier signal), the latter allows a parameter (amplitude, frequency, phase, pulse width) change according to the former value.
Often with a high-frequency signal is modulated sinusoidal signal as a carrier signal.
This article discusses the significance of signal modulation, signal modulation analysis of an important position in radar systems, and gives some basic waveforms including sine FM signals, equal sawtooth frequency modulation, phase modulation and square-wave symmetry pseudo-random code modulation, and combine book knowledge using matlab simulation gives the basic waveform and spectrum analysis section FM phase modulation, and then in-depth understanding of the laws of the radar signal in the transmission process. Among them, the common modulation methods are AM, FM, phase modulation, pulse width modulation.
Keywords: Signal modulation FM Phase modulation
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