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Research on the Method of Demodulation for PCM/FM Signal Based on Instantaneous Frequency Measurement

机译：基于瞬时频率测量的PCM / FM信号解调方法研究

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摘要

Based on the theory of instantaneous frequency measurement, a method of demodulation for PCM/FM signal with Doppler frequency offset is presented. Firstly, through estimating Doppler frequency offset by instantaneous frequency measurement, the method corrects the frequency offset of PCM/FM signal and improves the precision of bit synchronization. Then, according to the relation between two adjacent points of bit synchronization, it realizes demodulation. The paper discusses the basic principle and the implementation of the method, analyses some factors that can affect the precision of instantaneous frequency measurement and the effect of Doppler frequency offset on demodulation, and proposes methods to improve the precision of instantaneous frequency measurement and the performance of demodulation. The results of computer simulation show that the method with a bright future for application is good at anti-jamming, better than other methods of demodulation and convenient to be realized by software and DSP
机译：基于瞬时频率测量理论，提出了一种具有多普勒频偏的PCM / FM信号解调方法。首先，通过瞬时频率测量估计多普勒频偏，该方法校正了PCM / FM信号的频偏，提高了比特同步的精度。然后，根据比特同步的两个相邻点之间的关系，实现解调。本文讨论了该方法的基本原理和实现方法，分析了影响瞬时频率测量精度的一些因素以及多普勒频偏对解调的影响，提出了提高瞬时频率测量精度和测量性能的方法。解调。计算机仿真结果表明，该方法具有广阔的应用前景，具有良好的抗干扰能力，优于其他解调方法，易于通过软件和DSP实现。

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