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通过比较由直接数字频率合成器与锁相环组成的不同形式的Chirp—UWB信号产生系统的特点,包括环外混频、环内插入混频、激励三种,最终确定了DSS激励PLL的方式,并详细介绍了这种方式的工作原理,重点介绍了整个系统的相位噪声和杂散。同时在MATLAB/Simulink环境中建立整个系统的动态仿真模型来进行仿真,分析系统的合理性、正确性以及其中的相位噪声和杂散等重要性能指标,为提高整个系统的性能做好理论研究。
By comparing the characteristics of different forms of Chirp-UWB signals, including the direct digital frequency synthesizer and the phase-locked loop, including the out-of-band mixing, the in-band interpolation and the excitation, the DSS excitation PLL is finally determined , And describes in detail the working principle of this approach, focusing on the entire system of phase noise and spurious. At the same time, a dynamic simulation model of the whole system is established in the MATLAB / Simulink environment to simulate and analyze the rationality and correctness of the system as well as the important performance indexes such as phase noise and spur in order to improve the performance of the whole system.