Development of the imaging riometer control system on a multi-task operating system

Abstract

We have developed a controller for the imaging riometer running on a multi-task operating system. Beam scanning and data sampling of the system are controlled by the interrupt handler triggered by an external cyclic signal. We can monitor the condition of the system and obtain data from a remote station even while the system is busy for observation, because the system runs on a multi-task operating system. In this paper, we describe the performance of the system and some results of task delay measurement when the CPU is under a heavy load. The measured task delay for cyclic signals was within 30μs, which is negligible for data sampling period (12.5ms) and beam scanning (125ms) period. These results show that the system can control beam scanning and data sampling under a heavy CPU load.