摘要： 皮卫星具有成本低、反应灵敏等特点,是航天领域的研究热点。由于体积和质量的限制,大卫星复杂的星载计算机系统结构并不适用于皮卫星。介绍基于COTS 器件的皮卫星星载计算机系统模块化设计技术,将多准则决策方法TOPSIS 排序法应用于皮卫星的芯片选型。研制2 版基于不同低功耗微控制单元的计算机原理样机,并通过大量实验测试比较2 版原理样机的速度、功耗、运行温度等性能。当工作温度为27℃ ,主频为8 MHz 时,基于MSP430 芯片和ATxmega 芯片的原理样机的MIPS 值分别为7. 449 和6. 781;运行加法运算的时间分别为0. 613 μs和1. 381 μs,功耗分别为38. 224 mW 和54. 411 mW。在-40℃ ~85℃ 时,原理样机均可正常工作。
关键词:
皮卫星,
星载计算机,
低功耗微控制器,
商用器件,
TOPSIS 方法,
可靠性
Abstract: Pico-satellite,which features low cost and flexiblity,is a hot topic in aerospace applications. Due to the
limitation of size and weight,design of On-Board Computer(OBC) for pico-satellite systems is different with that in the larger satellites. This paper introduces the modular design techniques of an OBC based on Commercial Off-the-Shelf (COTS) devices for pico-satellites. The chip selection is important for electronic system design. The selection of the suitable COTS devices is performed by using Technique for Order of Preference by Similarity to Ideal Solution(TOPSIS) method. Two versions of prototype OBC systems based on different types of low power MCUs which are selected by TOPSIS method are implemented. The running speed,power consumption,and operational temperature of two OBC systems are tested and compared. When operational temperature is 27℃ and main frequency is 8 MHz,the MIPS of OBC system based on MSP430 and ATxmega are 7. 449 and 6. 781,respectively. The running times of addition are 0. 613 μs and 1. 381 μs,respectively. The power consumptions of addition are 38. 224 mW and 54. 411 mW,respectively. The performance of the OBC system based on MSP430 is better. Two OBC systems can work correctly at -40℃ to 85℃ .
Key words:
pico-satellite,
On-board Computer(OBC),
low power Micro Control Unit(MCU),
Commercial Off-theshelf(
COTS) device,
Technique for Order of Preference by Similarity to Ideal Solution(TOPSIS) method,
reliability
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