星载1553B总线通信接口研究

为保证星载1553B总线通信的可靠性，在忽略容性、感性阻抗的情况下，基于叠加定理对变压器耦合方式下总线接口电路建立了等效模型，计算出接口变压器的等效输入阻抗，得出总线终端输入电压信号U。在假定双绞传输线理想状态下，利用软件分别对U与隔离电阻Rs、终端匹配电阻R，和传输线阻抗Rw之间的关系曲线进行了仿真，确定了相关电阻的选取范围。该模型的建立与仿真，为1553B总线接口设计提供了一种新的模型和验证方法，具有一定的工程应用价值。

Study of 1553B Bus Interface Circuit in Spacecraft

In order to guarantee reliable communication in spacecraft, according to the superposi- tion theorem, an equivalent model is set for the 1553B bus interface circuit based on transformer coupled mode without regard to its inductance and capacitance characteristic, the equivalent input impedance of the interface transformer is calculated, and the input voltage U of the remote termi- nal is calculated. In the condition of ideal transmission lines, the U-Rs, U-RT, U-Rw relation curves are simulated, and the Rs ,RT ,Rw value ranges are obtained. The establishment and simu lation of the interface model provide a good method for the 1553B bus design.