Evaluation of coherent netted radar carrier stability while synchronised with GPS-disciplined oscillators
Evaluation of coherent netted radar carrier stability while synchronised with GPS-disciplined oscillators
复制标题
与 GPS 振荡器同步时相干网状雷达载波稳定性评估
DOI：
10.1109/radar.2011.5960705
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
W. Al
中科院分区：
文献类型：
--
作者：
J. Sandenbergh;M. Inggs;W. Al
本文采用双混频时延(DMTD)技术来表征组网雷达载波的稳定性。此外，还比较了双绞线(TP)电缆同步和GPS约束振荡器(GPSDO)同步的性能。这是利用英国伦敦大学学院(UCL)开发的实验性相干组网雷达(NetRAD)和南非开普敦大学(UCT)开发的基于石英的全球定位系统(GPSDOS)完成的。NetRAD被配置为DMTD测试台，使用现有的雷达硬件。通过对采集到的中频信号进行后处理，提取了时频偏差、时间偏差和Allan偏差等参数。在实验室条件下进行的零量程测量与在100米基线上进行的现场测量并列。在频率稳定度和相位抖动方面，UCT GPSDO和参考TP电缆系统的性能相当。然而，正如预期的那样，GPSDO的时间同步远没有那么精确。
In this paper the dual-mixer time delay (DMTD) technique is used to characterize netted radar carrier stability. Moreover, the performance of synchronization via twisted-pair (TP) cable was compared to that of GPS-disciplined oscillators (GPSDO). This was done using an experimental coherent netted radar (NetRAD), developed at University College London (UCL), UK, and quartz-based GPSDOs, developed at the University of Cape Town (UCT), South Africa. NetRAD was configured as a DMTD test bench, using the existing radar hardware. Parameters such as time and frequency offset, time deviation and Allan deviation were extracted through post-processing of the sampled IF signal. Zero-range measurements conducted under laboratory conditions are presented alongside field measurements conducted over a base-line of 100 metres. Performance of the UCT GPSDOs and the reference TP cable systems were comparable in terms of frequency stability and phase jitter. However, as was expected, the GPSDO time sync was much less precise.