Abstract: Aeronautical Telecommunication Network（ATN） under the construction in China or other counties is the basis for the CNS/ATM system.In the air/ground subnetwork of ATN，the cost of header occupies great proportion of the entire packet transmission.A new packet header compression algorithm is presented in the paper.In the algorithm the segmentation of the packet is cancelled，the flag of no packet header is set，and the method of using W-LSB algorithm to compress the packet header local compress reference is proposed.After compression，the size of the packet header is decreased to about 1 to 3 bytes.Great simulations testify that the algorithm can promote the successive transmission rate，and decrease the transmission delay of the packets.

Key words: Aeronautical Telecommunication Network（ATN）, air/ground subnework, packet header compression, Window-based Least Significant Bits（W-LSB）

摘要： 航空电信网是实现新航行系统的基础，目前国际国内都已经开始了航空电信网的建设。在航空电信网的空地通信中，报头开销占了整个报文传输的很大比例，严重浪费了宝贵的空地无线通信资源。提出了一种新的空地通信报头压缩算法，取消了报文的分段选项，设置了无报头的选择项，并且在进行报头替换的基础上用W-LSB算法进一步压缩报文本地压缩参考，从而成功地将报文头部大小压缩至1~3个字节。大量的仿真验证了该报头压缩算法能够提高报文的传输成功率，减少报文的传输时延。

关键词: 航空电信网, 空地子网, 报头压缩, 基于窗口的最低有效位编码算法