远程多通道高速数据采集精确同步方案设计

Design of remote and multi-channel high speed data acquisition scheme with precise synchronization

针对大口径阵列应用对数据采集前置的要求,设计了一种新型分布式数据采集精确同步方案。该方案通过对参考时钟和触发信号进行级联分配,并结合一种AutoSync自动延时测量技术,不仅实现了精确同步采集,还可灵活扩展系统规模,具有高同步精度、高扩展性的特点。通过对实测数据分析表明,在两个采集模块间隔50米距离条件下,该方案可获得标准差为20ps的同步精度,适合大口径阵列的应用。

Considering the requirement of large aperture array for front-end data acquisition, a novel scheme of distributed data acquisition with precise synchronization is designed. In this scheme, the reference clock and trigger signal is distributed in a cascaded way, combined with a technique to measure the trigger delay automatically which is called AutoSync. The proposed scheme not only achieves the performance of precise synchronization, but also has the ability to expand flexibly. The scheme has the characteristic of high precise synchronization and flexible expansibility. The analysis of the sampled data shows that, under the condition of two different sample channels with 50 meters distance, the proposed scheme can achieve synchronization accuracy of 20ps standard deviation, and is suitable for large aperture sparse array application.