各种调制的动态矢量合成仿真

Dynamic Simulation of Vector Composing for Various Modulations

在“高频电子线路”课程中介绍角度调制时普遍会介绍矢量合成法,但静态的矢量合成使学生理解信号的动态变化过程造成一定的难度。为此,对各种调制波进行了归纳分析,得出一个统一对象化模型,并给出了上边带、下边带、双边带、载波和合成矢量等五个矢量的动态坐标计算的迭代公式,然后用面向对象的程序设计方法设计了一个参数可调的动态仿真课件,让学生更直观地了解基于矢量合成的角度调制和幅度调制。实践证明,所采用的方法是有效的,它对学生理解各种调制信号有很大的帮助作用。

The vector composing method is introduced generally to the angle modulation in the course ＂Radio Frequency Circuits＂. But using the static vector composing is difficult to explain the dynamic change of signal. Therefore, various modulated signals are summed up into an uniform object model in this paper. The iterative equations for calculating the coordinates of five vectors （ USB, LSB, DSB, carrier and composing vector） are also given. Then a dynamic simulation courseware, whose parameters can be adjusted, is designed by using the OOP method for students to understand the angle modulation and the amplitude modulation based on the vector composing directly. The fact proves that the methods described above are efficient and helpful for students.