Meshksar N, Ferraioli L, Mance D, Ten Pierick J, Giardini D
Institut für Geophysik, ETH Zürich, Sonneggstrasse 5, CH-8092 Zürich, Switzerland.
Rev Sci Instrum. 2020 Sep 1;91(9):095003. doi: 10.1063/5.0018536.
Electrostatic actuation of a free-floating test-mass was tested in the Laser Interferometer Space Antenna (LISA) Pathfinder mission, and it will be integrated into the LISA. We have investigated the LISA Pathfinder actuation accuracy with respect to the precision of fractional digits in the field programmable gate array (FPGA) code of actuation electronics. The LISA Pathfinder data showed that the rounding errors in the FPGA code result in an erroneous force that contaminated the main mission observable, and this error was compensated in the post-processing of the LISA Pathfinder data. To avoid a similar issue for the LISA, the LISA actuation accuracy can be improved by increasing the number of fractional digits in the FPGA code. However, this is restricted by some hardware limitations. In this paper, we investigate the necessary enlargement of the FPGA to fulfill the LISA acceleration requirements and propose a design optimization for LISA actuation electronics.
在激光干涉空间天线（LISA）探路者任务中对自由漂浮测试质量块的静电驱动进行了测试，并且它将被集成到LISA中。我们已经针对驱动电子设备的现场可编程门阵列（FPGA）代码中的小数位数精度研究了LISA探路者的驱动精度。LISA探路者的数据表明，FPGA代码中的舍入误差会导致错误的力，从而污染主要任务可观测值，并且这个误差在LISA探路者数据的后处理中得到了补偿。为了避免LISA出现类似问题，可以通过增加FPGA代码中的小数位数来提高LISA的驱动精度。然而，这受到一些硬件限制。在本文中，我们研究了FPGA为满足LISA加速度要求而进行必要扩展的问题，并提出了LISA驱动电子设备的设计优化方案。
