本文件规定了用于在空间机构之间传输航天器姿态信息的两种标准信息格式:姿态参数信息（APM）和姿态星历信息（AEM）此类交换用于: -用于跟踪或姿态估计支持的飞行前规划； -调度态度和数据处理支持； -开展态度行动； -进行态度比较； -进行姿态传播和/或传感器预测； -初始化子系统模拟器（通信、电源等）的测试。 本文件包括消息格式设计所要满足的一系列要求和标准对于这些要求不能满足参与机构需求的交易所，可以选择另一种机制。

This document specifies two standard message formats for use in transferring spacecraft attitude information between space agencies: the Attitude Parameter Message (APM) and the Attitude Ephemeris Message (AEM).？ Such exchanges are used for: - preflight planning for tracking or attitude estimation support; - scheduling attitude and data processing support; - carrying out attitude operations; - performing attitude comparisons; - carrying out attitude propagations and/or sensor predictions; - testing to initialize sub-system simulators (communications, power, etc.). This document includes sets of requirements and criteria that the message formats have been designed to meet.？ For exchanges where these requirements do not capture the needs of the participating agencies, another mechanism may be selected.