One of the most important features of modern minor satellites is to realize autonomous moving. The performance of the satellite autonomous computer operating system acting as the control center is utmost important. Th...One of the most important features of modern minor satellites is to realize autonomous moving. The performance of the satellite autonomous computer operating system acting as the control center is utmost important. The recent trend in operating system development is adopting microkernel architecture which holds such advantages as microminiaturization, modularity, portability and extendibility. The performance of I/O subsystem is currently receiving considerable research attention. Object-orientation offers an approach to application development in which software system can be constructed by composing and refining the pre-designed plug-compatible software components.It also starts with some basic notions fairly well accepted in computer science, namely encapsulation and reuse. In this paper, a new object-oriented real-time I/O subsystem model has been designed.In this model, the traditional I/O subsystem framework is discarded and a stream mechanism based on the object-oriented concept is introduced. In addition, the I/O requests are classified according to their time emergency to obtain real-time performance. So, this model meets such satelliteperformance requirements as reliability, flexibility, portability and real-time performance.展开更多
A novel reconfigurable hardware system which uses both muhi-DSP and FPGA to attain high performance and real-time image processing are presented. The system structure and working principle of mainly processing multi-B...A novel reconfigurable hardware system which uses both muhi-DSP and FPGA to attain high performance and real-time image processing are presented. The system structure and working principle of mainly processing multi-BSP board, extended multi-DSP board are analysed. The outstanding advantage is that the communication among different board components of this system is supported by high speed link ports ＆ serial ports for increasing the system performance and computational power. Then the implementation of embedded real-time operating systems （RTOS） by us is discussed in detail. In this system, we adopt two kinds of parallel structures controlled by RTOS for parallel processing of algorithms. The experimental results show that exploitive period of the system is short, and maintenance convenient. Thus it is suitable for real-time image processing and can get satisfactory effect of image recognition.展开更多
In this paper,a novel train positioning method considering satellite raw observation data was proposed,which aims to promote train positioning performance from an innovative perspective of the train satellite-based po...In this paper,a novel train positioning method considering satellite raw observation data was proposed,which aims to promote train positioning performance from an innovative perspective of the train satellite-based positioning error sources.The method focused on overcoming the abnormal observations in satellite observation data caused by railway environment rather than the positioning results.Specifically,the relative positioning experimental platform was built and the zero-baseline method was firstly employed to evaluate the carrier phase data quality,and then,GNSS combined observation models were adopted to construct the detection values,which were applied to judge abnormal-data through the dual-frequency observations.Further,ambiguity fixing optimization was investigated based on observation data selection in partly-blocked environments.The results show that the proposed method can effectively detect and address abnormal observations and improve positioning stability.Cycle slips and gross errors can be detected and identified based on dual-frequency global navigation satellite system data.After adopting the data selection strategy,the ambiguity fixing percentage was improved by 29.2%,and the standard deviation in the East,North,and Up components was enhanced by 12.7%,7.4%,and 12.5%,respectively.The proposed method can provide references for train positioning performance optimization in railway environments from the perspective of positioning error sources.展开更多
在动态电能质量监测系统中,较大区域电网动态参数实时联网监测以及瞬时电能事件发生时,历史数据的分析一直是便携式监测仪器难以突破的瓶颈,为此在虚拟仪器平台上将过程控制中的现场总线(process field bus,PROFIBUS)和实时控制系统相结...在动态电能质量监测系统中,较大区域电网动态参数实时联网监测以及瞬时电能事件发生时,历史数据的分析一直是便携式监测仪器难以突破的瓶颈,为此在虚拟仪器平台上将过程控制中的现场总线(process field bus,PROFIBUS)和实时控制系统相结合,设计了区域电网动态电能质量的多点实时监测系统,通过PROFIBUS网络的组态,实现了对闪变、电压跌落等动态电能质量参数的连续实时跟踪、数据传输、存储以及在线分析。最后在实验环境下对系统进行了测试,结果精度较高,可以满足对电网动态电能参数实时监测的要求。展开更多
用于工业过程控制、通信和航天器上的嵌入式计算机对软、硬件的可靠性要求极高。对于软件较为复杂的嵌入式计算机系统，必须采用高可靠的实时多任务操作系统。处于操作系统和硬件之间的板级支持包(BSP Board Support Packge)的设计是一...用于工业过程控制、通信和航天器上的嵌入式计算机对软、硬件的可靠性要求极高。对于软件较为复杂的嵌入式计算机系统，必须采用高可靠的实时多任务操作系统。处于操作系统和硬件之间的板级支持包(BSP Board Support Packge)的设计是一个复杂的过程，该文介绍了基于VxWorks操作系统的板级支持包以及板级支持包设计、调试中的问题。展开更多
文摘One of the most important features of modern minor satellites is to realize autonomous moving. The performance of the satellite autonomous computer operating system acting as the control center is utmost important. The recent trend in operating system development is adopting microkernel architecture which holds such advantages as microminiaturization, modularity, portability and extendibility. The performance of I/O subsystem is currently receiving considerable research attention. Object-orientation offers an approach to application development in which software system can be constructed by composing and refining the pre-designed plug-compatible software components.It also starts with some basic notions fairly well accepted in computer science, namely encapsulation and reuse. In this paper, a new object-oriented real-time I/O subsystem model has been designed.In this model, the traditional I/O subsystem framework is discarded and a stream mechanism based on the object-oriented concept is introduced. In addition, the I/O requests are classified according to their time emergency to obtain real-time performance. So, this model meets such satelliteperformance requirements as reliability, flexibility, portability and real-time performance.
基金This project was supported by the National Natural Science Foundation of China(60135020) National Key Pre-researchProject of China(413010701 -3) .
文摘A novel reconfigurable hardware system which uses both muhi-DSP and FPGA to attain high performance and real-time image processing are presented. The system structure and working principle of mainly processing multi-BSP board, extended multi-DSP board are analysed. The outstanding advantage is that the communication among different board components of this system is supported by high speed link ports ＆ serial ports for increasing the system performance and computational power. Then the implementation of embedded real-time operating systems （RTOS） by us is discussed in detail. In this system, we adopt two kinds of parallel structures controlled by RTOS for parallel processing of algorithms. The experimental results show that exploitive period of the system is short, and maintenance convenient. Thus it is suitable for real-time image processing and can get satisfactory effect of image recognition.
基金Project(52272339)supported by the National Natural Science Foundation of ChinaProject(2023YFB390730303)supported by the National Key Research and Development Program of China+2 种基金Project(L2023G004)supported by the Science and Technology Research and Development Program of China State Railway Group Co.,Ltd.Project(QZKFKT2023-005)supported by the State Key Laboratory of Heavy-duty and Express High-power Electric Locomotive,ChinaProject(2022JZZ05)supported by the Open Foundation of MOE Key Laboratory of Engineering Structures of Heavy Haul Railway(Central South University),China。
文摘In this paper,a novel train positioning method considering satellite raw observation data was proposed,which aims to promote train positioning performance from an innovative perspective of the train satellite-based positioning error sources.The method focused on overcoming the abnormal observations in satellite observation data caused by railway environment rather than the positioning results.Specifically,the relative positioning experimental platform was built and the zero-baseline method was firstly employed to evaluate the carrier phase data quality,and then,GNSS combined observation models were adopted to construct the detection values,which were applied to judge abnormal-data through the dual-frequency observations.Further,ambiguity fixing optimization was investigated based on observation data selection in partly-blocked environments.The results show that the proposed method can effectively detect and address abnormal observations and improve positioning stability.Cycle slips and gross errors can be detected and identified based on dual-frequency global navigation satellite system data.After adopting the data selection strategy,the ambiguity fixing percentage was improved by 29.2%,and the standard deviation in the East,North,and Up components was enhanced by 12.7%,7.4%,and 12.5%,respectively.The proposed method can provide references for train positioning performance optimization in railway environments from the perspective of positioning error sources.
文摘在动态电能质量监测系统中,较大区域电网动态参数实时联网监测以及瞬时电能事件发生时,历史数据的分析一直是便携式监测仪器难以突破的瓶颈,为此在虚拟仪器平台上将过程控制中的现场总线(process field bus,PROFIBUS)和实时控制系统相结合,设计了区域电网动态电能质量的多点实时监测系统,通过PROFIBUS网络的组态,实现了对闪变、电压跌落等动态电能质量参数的连续实时跟踪、数据传输、存储以及在线分析。最后在实验环境下对系统进行了测试,结果精度较高,可以满足对电网动态电能参数实时监测的要求。
文摘用于工业过程控制、通信和航天器上的嵌入式计算机对软、硬件的可靠性要求极高。对于软件较为复杂的嵌入式计算机系统，必须采用高可靠的实时多任务操作系统。处于操作系统和硬件之间的板级支持包(BSP Board Support Packge)的设计是一个复杂的过程，该文介绍了基于VxWorks操作系统的板级支持包以及板级支持包设计、调试中的问题。
