Analog Front-End: Circuit of Pulsar-Based Timing Synchronization for the WAMS
Analog Front-End: Circuit of Pulsar-Based Timing Synchronization for the WAMS
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DOI：
10.1109/tia.2022.3145783
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发表时间：
2022-03
影响因子：
4.4
通讯作者：
W. Qiu;H. Yin;Liang Zhang;Xiqian Luo;Yuru Wu;Kaiqi Sun;Wenxuan Yao;Shutang You;Yilu Liu
中科院分区：
文献类型：
--
作者：
W. Qiu;H. Yin;Liang Zhang;Xiqian Luo;Yuru Wu;Kaiqi Sun;Wenxuan Yao;Shutang You;Yilu Liu
用于射电望远镜脉冲星采集的前端电路决定了整个脉冲星授时框架的可用性。然而，在电路设计过程中，使用真正的射电望远镜将是昂贵和消耗资源的。为了解决这个问题，本文提出了硬件在环仿真解决方案来实时生成、采样和提取脉冲信号。首次提出了人工脉冲产生方法，以产生接近真实脉冲星信号的脉冲。然后，提出了三种用于产生模拟脉冲的模拟前端电路架构（afca），包括叠加、衰减器和基于衰减器的叠加结构。生成的脉冲在形状、幅度和噪声水平上都接近真实脉冲星信号。其次，开发了一种基于脉冲星的定时同步框架，用于处理采样数据，可以提高广域监测系统的定时精度。利用仿真脉冲和真实脉冲星信号进行了多次实验，验证了模拟前端和基于脉冲星的定时同步框架的有效性。结果表明，所设计的AFCAs能够产生有效的模拟脉冲，且方便、灵活。
The front-end circuit used in the pulsar acquisition of the radio telescope determines the availability of the entire pulsar-based timing framework. However, it would be expensive and resource consuming to use a real radio telescope in the circuit design process. To address this issue, in this article, the hardware-in-the-loop simulation solution is proposed to generate, sample, and extract pulse signals in real time. The artificial pulse generation method is first proposed to generate the pulses that are close to real pulsar signals. Then, three analog front-end circuit architectures (AFCAs) are proposed to generate the analog pulses, including the superposition, attenuator, and attenuator-based superposition structures. The generated pulses are close to the real pulsar signal in shape, amplitude, and noise level. Next, a pulsar-based timing synchronization framework that can be used to improve the timing accuracy of the wide-area monitoring systems is developed to process the sampled data. Multiple experiments are conducted to verify the effectiveness of the analog front-end and the pulsar-based timing synchronization framework using the simulated pulse and real pulsar signals. The results demonstrated that the designed AFCAs can generate effective analog pulses, and is convenient and flexible.