DPU(data process unit,数据处理单元)是嵌入式系统中的一个典型组件,被广泛应用于太空领域,它在层次化的嵌入式系统架构中起到承上启下的作用。保证这类安全攸关系统可靠性的主要方法包括冗余容错、测试和仿真。近年来,形式化方法作为...DPU(data process unit,数据处理单元)是嵌入式系统中的一个典型组件,被广泛应用于太空领域,它在层次化的嵌入式系统架构中起到承上启下的作用。保证这类安全攸关系统可靠性的主要方法包括冗余容错、测试和仿真。近年来,形式化方法作为确保可靠性的一种重要补充,得到了广泛的关注。BIP(behavior interaction priority)是一个通用的系统级形式化建模框架,支持层次化和模块化,包含一套支持建模、模拟和验证的工具集。给出了一种基于BIP框架对DPU进行系统级建模与验证的一般方法,总结了一套使用BIP框架对DPU建模应遵循的原则及技巧。以航天领域一个真实DPU系统为例,系统地对方法、原则和技巧进行了介绍。通过该方法,找出了使用传统方法难以发现的错误。实践表明,该方法具有很好的可复用性和可扩展性,是确保系统可靠性的有益补充。展开更多
A novel laser ranging system using chaotic laser as probe light source is designed and presented.The system is made up of five components:chaotic light source,transmitter,receiver,data acquisition unit and data proces...A novel laser ranging system using chaotic laser as probe light source is designed and presented.The system is made up of five components:chaotic light source,transmitter,receiver,data acquisition unit and data processing unit.Chaotic light is generated by an 808 nm,500 mW,single-mode laser diode with optical feedback cavity.Single target detection and multi-target detection are experimentally realized by correlating the chaotic reference light and the reflected or backscattered probe light.The performances,including the resolution of 18 cm within at least 130 m range and the sensitivity of-20 dB,are achieved and analyzed.展开更多
文摘DPU(data process unit,数据处理单元)是嵌入式系统中的一个典型组件,被广泛应用于太空领域,它在层次化的嵌入式系统架构中起到承上启下的作用。保证这类安全攸关系统可靠性的主要方法包括冗余容错、测试和仿真。近年来,形式化方法作为确保可靠性的一种重要补充,得到了广泛的关注。BIP(behavior interaction priority)是一个通用的系统级形式化建模框架,支持层次化和模块化,包含一套支持建模、模拟和验证的工具集。给出了一种基于BIP框架对DPU进行系统级建模与验证的一般方法,总结了一套使用BIP框架对DPU建模应遵循的原则及技巧。以航天领域一个真实DPU系统为例,系统地对方法、原则和技巧进行了介绍。通过该方法,找出了使用传统方法难以发现的错误。实践表明,该方法具有很好的可复用性和可扩展性,是确保系统可靠性的有益补充。
基金supported by the National Natural Science Foundation of China(No.60777041and No.60908014)
文摘A novel laser ranging system using chaotic laser as probe light source is designed and presented.The system is made up of five components:chaotic light source,transmitter,receiver,data acquisition unit and data processing unit.Chaotic light is generated by an 808 nm,500 mW,single-mode laser diode with optical feedback cavity.Single target detection and multi-target detection are experimentally realized by correlating the chaotic reference light and the reflected or backscattered probe light.The performances,including the resolution of 18 cm within at least 130 m range and the sensitivity of-20 dB,are achieved and analyzed.
