A Prototype of Non-Volatile Data Recorder for Space Systems
- Paper number
IAC-07-D1.2.04
- Author
Mr. Takeshi Sasada, Japan Aerospace Exploration Agency (IAT/JAXA), Japan
- Year
2007
- Abstract
The semiconductor memory devices are mainly used in the recent on-board data recorders because of not only high speed data rate but also flexible random access, high mechanical reliability, and disturbance-free of spacecraft. The SRAMs, small capacity and low latency, are generally used for a temporary working area and application software in the on-board computer systems. The DRAMs, large recording density, are widely used in mass memory. However, the refresh every tens of milliseconds is indispensable for holding charge in capacitors on DRAM. Namely, there is a possibility of data erasing at the power failure of space system. Although the data transfer rate of flash memory is quite slower than that of DRAM, the flash memory has an advantage over DRAM as a non-volatile memory. This is effective to the power consumption saving and the contingency of spacecraft power system. Recently, various types of large capacity NAND type flash memories are available in the commercial electronics area. The non-volatile data recorder (NVDR) using not conventional EEPROM but flash memory for space systems is studied. NVDR is applicable to on-board house-keeping data logging that is required high reliability and robustness. This paper describes the study of the function and performance demand for NVDR, the system design, and the development of NVDR prototype. The results of prototype evaluation and technical tasks are finally discussed.
- Abstract document