In this letter, we propose a novel estimator for the phase parameters of sinusoidal frequency-modulated (SFM) signals. First, we developed a simple function to perform phase modulation on the original SFM signal to obtain a new modulated signal. Second, we derived the amplitude spectrum (AS) of the modulated signal and proved that the AS exhibited peaks periodically. Third, we obtained the parameter estimation of SFM signals by locating the AS peaks. Finally, the estimates were refined to reduce bias. The simulation results show that the proposed technique has a lower signal-to-noise ratio threshold than the existing methods.

中文翻译：

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使用相位调制的正弦调频信号的参数估计

在这封信中，我们提出了一种新的正弦调频 (SFM) 信号相位参数估计器。首先，我们开发了一个简单的函数来对原始 SFM 信号进行相位调制以获得新的调制信号。其次，我们推导出调制信号的幅度谱 (AS) 并证明 AS 周期性地出现峰值。第三，我们通过定位AS峰值获得了SFM信号的参数估计。最后，对估计进行了改进以减少偏差。仿真结果表明，与现有方法相比，所提出的技术具有更低的信噪比阈值。