论文标题
通过短期正弦分析对正弦载体调制信号的表征和缓解
Characterization and Mitigation of Sinusoidal Carrier Modulation Signals by Short-Term Sinusoidal Analysis
论文作者
论文摘要
大多数无线电信号可以描述为正弦载体调制的一种形式。这些信号具有在足够短的时间内观察到的特性，波形大约是正弦的，表现出恒定的大小，频率和相。当用足够高的采样速率数字化时，可以辨别出该正弦曲线。相关的信号可以表示为正弦，频率，大小和相。这些参数随后可用于检测和表征，包括识别。这些参数也可以用于合成信号的无噪声估计值。可以从原始数据中连贯地减去综合信号，以取消信号，名义上而不会失真相关的噪声或附近信号。在本报告中，描述了短期正弦近似所需的条件。在VHF波段窄带FM调制信号的情况下，检查了取消技术的性能。
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.
