遥测速变数据实时无损压缩技术研究

Research of Real-time Lossless Compression Technology for Fast Varying Telemetry Data

从遥测系统速变数据的码率快、实时性好、可靠性高的特点出发,提出了嵌入式硬件压缩的方案,建立了一套系统的数据压缩装置及其测试单元。搭建了以FPGA和DSP为架构体系的硬件平台。以模块化为设计思想,实现数据采集、无损压缩和回读。探讨了以优化数据无损压缩时空性能为前提的压缩算法的选取方式,提出了压缩前进行线性预测编码的方案。以提高遥测系统可靠性为出发点,提出了数据分组设计和压缩后增加数据缓冲。经测试单元对回读数据解压分离后进行数据分析可以得出,数据压缩单元能够对四种标准信号源进行实时无损压缩,且具有较高的压缩时空性能。

Fothe characteristicof fasvarying telemetry data, rapid rate, real-time, and high reliability, em- bedded hardware compression scheme iadopted, and systematidatcompression device and tesuniare estab- lished. Hardware platform with FPGand DSP architecture system ibuild, and modulaideaare raised. In ordeto realize datacquisition, losslescompression and readback are presented. To optimize the performance of the spatial and temporal propertieof losslesdatcompression aprecondition, the method to seleckind of appro- priate compression algorithm idiscussed, and lineapredictive coding scheme before compression iproposed. To improve the reliability of the telemetry system astarting point, datpackedesign and adding buffeaftecompression are presented. Iiconcluded afteanalysiof the datdecompressed and separated thathe datcom- pression uniicapable fofoustandard signal sourceto compresin real time, with high spatial and temporal qualities.