基于短时正弦分析的正弦载波调制信号的特征和抑制
Characterization and Mitigation of Sinusoidal Carrier Modulation Signals by Short-Term Sinusoidal Analysis
摘要：
大多数无线电信号可以被描述为正弦载波调制的形式。这些信号具有这样的特性，即当在足够短的时间段内观察时，波形近似为正弦曲线，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，可以辨别该正弦波。相关信号可以表示为具有时变频率、幅度和相位的正弦曲线。这些参数随后可用于检测和表征，包括鉴定。这些参数还可以用于合成信号的无噪声估计。可以从原始数据中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。在本报告中，描述了短时正弦近似所需的条件。在VHF波段窄带FM调制信号的情况下，检查消除技术的性能。
英文摘要：
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.
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