Characterization and Mitigation of Sinusoidal Carrier Modulation Signals by Short-Term Sinusoidal Analysis
Characterization and Mitigation of Sinusoidal Carrier Modulation Signals by Short-Term Sinusoidal Analysis
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通过短期正弦分析表征和缓解正弦载波调制信号
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
S. Ellingson
中科院分区：
文献类型：
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作者：
S. Ellingson
大多数无线电信号可以描述为一种正弦载波调制形式。当在足够短的时间内观察到这些信号时，这些信号具有这样的特性，即波形近似为正弦，表现出恒定的幅度、频率和相位。当以足够高的采样率进行相干数字化时，就有可能分辨出这种正弦信号。相关信号可以表示为具有时变频率、幅度和相位的正弦信号。这些参数随后可用于检测和表征，包括鉴定。这些参数还可以用来合成信号的无噪声估计。可以从原始数据相干地减去合成信号，以便消除信号，名义上没有相关噪声或附近信号的失真。在这份报告中，描述了短时正弦近似所需的条件。在VHF频带窄带调频调制信号的情况下，研究了抵消技术的性能。
Most radio signals can be described as a form of sinusoidal carrier modulation. These signals have the property that when observed over a sufficiently short period of time, the waveform is approximately sinusoidal, exhibiting constant magnitude, frequency, and phase. When coherently digitized with sufficiently high sample rate, it is possible to discern this sinusoid. The associated signal can be represented as a sinusoid with time-varying frequency, magnitude, and phase. These parameters can subsequently be used for detection and characterization, including identification. The parameters can also be used to synthesize a noise-free estimate of the signal. The synthesized signal can be coherently subtracted from the original data in order to cancel the signal, nominally without distortion of the associated noise or nearby signals. In this report, the conditions required for the short-time sinusoidal approximation are described. Performance of the canceling technique is examined in the case of a VHF-band narrowband FM-modulated signal.