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为了正确地接收扩频应答机的高动态信号,接收机需要很宽的频率跟踪范围。二阶锁频环,因其对频率斜升信号的频率跟踪误差为0而广泛应用于扩频信号的跟踪环路。在详细分析了具有四象限反正切鉴频器的二阶锁频环的噪声特性、频率跟踪范围的基础上,通过仿真得到了最优环路带宽。整个分析和推导过程及结论对扩频信号跟踪环路的设计和优化具有很好的参考价值。
In order to receive the high dynamic signal of the spread spectrum transponder correctly, the receiver needs a wide frequency tracking range. Second-order frequency-locked loop, because of its frequency ramp-up signal frequency tracking error of 0 is widely used in the spread spectrum signal tracking loop. Based on the detailed analysis of the noise characteristics and the frequency tracking range of the second-order frequency-locked loop with four-quadrant anti-tangent frequency discriminator, the optimal loop bandwidth is obtained through simulation. The whole analysis and derivation process and conclusion have good reference value for the design and optimization of spread spectrum signal tracking loop.