Ales Filippo, Mandel Oliver, Gath Peter, Johann Ulrich, Braxmaier Claus
Airbus Defence and Space, Friedrichshafen, Germany.
Karlsruher Institute of Technology (KIT), Karlsruhe, Germany.
Rev Sci Instrum. 2015 Aug;86(8):084502. doi: 10.1063/1.4928489.
We describe a phasemeter designed to autonomously acquire and track a heterodyne signal with low signal-to-noise ratio in a frequency band that spans from 1 MHz to 25 MHz. The background driving some of the design criterions of the phasemeter comes from studies on future space mission concepts such as orbiting gravitational wave observatories and next generation geodesy missions which all rely on tracking phasemeters in order to meet their mission goal. The phasemeter has been implemented within a field programmable gate array trying to minimize the requirement of computational resources and its performance has been tested using signal generators. Laboratory test has shown that the phasemeter is capable of locking to an input signal in less than half a millisecond, while its phase measurement accuracy is in the micro-radian range for measurement frequencies that span from mHz to Hz.
我们描述了一种相位计，它旨在自主采集和跟踪1MHz至25MHz频段内信噪比低的外差信号。推动该相位计一些设计标准的背景来自对未来太空任务概念的研究，如轨道引力波天文台和下一代大地测量任务，这些任务都依赖跟踪相位计来实现其任务目标。该相位计已在现场可编程门阵列中实现，以尽量减少对计算资源的需求，并且其性能已使用信号发生器进行了测试。实验室测试表明，该相位计能够在不到半毫秒的时间内锁定输入信号，而其相位测量精度在从mHz到Hz的测量频率范围内处于微弧度级别。
