高误码率星地链路上DWT类压缩图像的传输策略

摘要

星上图像压缩的方法越来越广泛地被数据量巨大的卫星型号所采用,而DWT类图像压缩方法以其更高的压缩比、独特的码流结构及良好的抗误码性能成为星上图像压缩的主要方法.针对高误码率星地链路上DWT类压缩图像的误码扩散问题,提出了一种截断压缩码流并对保留码流加强信道编码保护的策略.分析和仿真结果表明,该策略重建图像的效果相比现有的传输模式有大幅提高,甚至能够优于直接下传模式.%The onboard image compression has been adopted by more and more satellites of huge data, and the DWT image compression way has been the leading one for its better compression ratio, unique stream structure and favorable error resilience performance. For the problem of the error propagation of DWT compressed image for the high BER satellite-to-earth link, a strategy of truncating coding stream and reinforcing the channel encoding is presented. The results of analysis and simulation show that this strategy works more efficient than the conventional transmission mode, even better than the mode of transmission without image compression.