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针对高动态低载噪比环境下锁频环跟踪精度不高的问题,文章提出了一种改进的锁频环结构,通过在传统锁频环结构基础上增加随机共振预处理模块,来减弱热噪声对锁频环跟踪精度的影响。仿真结果表明,利用随机共振预处理模块对噪声的弱化作用,可以使得锁频环对载噪比低至20dB.Hz的信号进行稳定、高精度的跟踪,大大提高了锁频环的跟踪性能。
Aiming at the problem that the tracking accuracy of the frequency-locked loop is not high under the condition of high dynamic low carrier-to-noise ratio, an improved frequency-locked loop structure is proposed in this paper. The stochastic resonance pre-processing module is added to the traditional frequency- Effect of noise on tracking accuracy of frequency locked loop. The simulation results show that the weakening of the noise by the stochastic resonance pretreatment module can make the frequency-locked loop carry on stable and high-precision tracking of the signal with carrier-to-noise ratio as low as 20dB.Hz, which greatly improves the tracking performance of the frequency-locked loop.