摘要
为了更好地适应空间网络中图像数据的传输,提出了遥感图像压缩和天地通信协议的改进算法;针对JPEG2000编码中的小波变换环节,首先进行高频分量滤波处理,然后进行拉伸量化合并,从而缩短了压缩时间;针对传输TCP传输协议开销大,灵活性差的问题,利用选择性重传机制和拥塞控制机制改进传统UDP传输协议使其更适合于天地通信;实验结果显示,优化的压缩在保持信噪比40dB以上的同时与传统编码相比节省了30%的时间;优化的通信协议在传输速率快,传输时间长的情况下仍能保持90%以上的可靠性和优于sack机制的高吞吐量,两者结合的空间有效载荷数据处理方案是切实可行的。
In order to better adapt to the transmission of the image data in the space network, an improved algorithm of remote sensing image compression and an optimized satellite- ground communication protocol are proposed. In the process of wavelet transform in JPEG2000, firstly filter the high frequency component, and then merge stretching process and the lifting process, thereby reducing the compression time. As TCP transport protocol has problems of spending and flexibility, we use selective retransmission mechanism and con- gestion control mechanisms to improve the traditional UDP transport protocol and make it more suitable for the satellite ground communica- tion. Experimental results show that the optimized compression maintains a SNR greater than 40dB while saving 30% of encoding time. In the situation of high transmission speed and long transmission time, the optimized transport protocol could still have a high reliability of 90% and a better throughput capacity than Sack mechanism, and a combination of these two optimizations is practical.
出处
《计算机测量与控制》
北大核心
2013年第12期3411-3413,3420,共4页
Computer Measurement &Control
