Abstract: Real-time traffic is the hot debate on WDL multiple access.This paper studies the development and traits of WDL and proposes an MAC based on TDMA—Orthogonal Domain Time and Frequency Multiple Access，ODTFMA.In this protocol，the slot pre-assignment is based on the number of the planes and the max number of weapons is controlled by one plane.In one formation，multi-subnet works in different frequencies at the same time.This paper uses the OPNET modeler to emulate the performance of real-time traffic.The simulation results show the MAC adapts to the WDL and supports the real-time service efficiently.

Key words: weapon data link, delay, Multiple Access, OPNET

摘要： 信息的实时性传输是武器数据链多址接入协议研究的一个热点问题。在深入分析了武器数据链的发展和特点的基础上，提出了一种基于TDMA多址接入协议——正交域时频多址接入协议ODTFMA。该协议根据机群内的飞机数以及载机同时制导的最大武器数预先分配时隙。机群内多个武器子网采用多个正交频段互不干扰地同时工作。通过OPNET仿真软件对协议中时敏信息的传输时延进行分析。分析结果表明，协议能够满足武器数据链的时延要求，能够较好地支持实时性业务的传输。

关键词: 武器数据链, 时延, 多址接入, OPNET