A High-Speed Real-Time Digital Recorder Based on Personal Computer
- Issue 1, Pages: 19-25(2003)
Published:2003
DOI: 10.11834/jrs.20030104
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Published:2003
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在遥感领域中
稳定、高速率、海量数据的实时记录器被广泛用于原始数据记录
系统测试
对其设计、制造、测试的研究是必要的。该文阐述了利用微机实现高速数据实时记录器的方案、框架结构、设计原则、实现方法、以及实验结果。其优越性在于构造灵活
研制经费少
可扩展性、实用性好。
With the development of the technology of remote sensing
the demand the high data rate has been steadily growing. It is very important to design
develop and test a stable
high-speed
great-capacity and real-time recorder
because it is a necessary device in remote sensing for the raw data recording and the system testing. This paper introduces a high-speed
great-capacity and real-time recorder which is based on a personal computer the detail of design
the configuration
the development
the testing
and the verification of the Digital Recorder are presented in this paper. It basically consists of one data-acquiring card and several SCSI-adapter cards
which are added in the PCI bus of a personal computer. The data-acquiring card is a data input device. There is a SCSI hard disk on each SCSI adapter. All the SCSI adapters and disks compose a disk array as the storage device of the recorder. It can reduce the disk transfer delay by increasing the amount of SCSI disks
and improve the efficiency of disk array by balancing the load of disks
and extend the SCSI bus transfer speed by increasing the amount of SCSI adapters. The recorded data from the acquiring card is transferred to the computer memory
and then to the SCSI-adapter cards by DMA mode. The SCSI-adapters will write all the data blacks to SCSI disks. There are many buffer cells with a same size in memory to smooth the inadaptability between input data rate and storing data rate. And the buffer cells are dlvided into two parts
conventional memory buffers and extended memory buffers
since the extended memory can’t be accessed directly under DOS system. Because of accessing conventional memory may have more efficiency than the extended one
the extended memory will not be used unless the conventional memory has been exhausted. Because of the especial access rules to disks and buffer cells
the position of a data blocks in the disk array may be uncertain. An index to all input data blocks enable the data blocks to be written to any disk randomly
but the data can still be restored in original order according to the indexes of each data block. Data acquiring and disk writing is driven by interrupt
which is the protection of real time. Rational layout of the data acquiring and writing disk enhances the performance. Because of the flexible structure
it has good practicability
and is easy to be developed economically.
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