The design, composition and function of automatic test system for transponder and distance measuring equipment are discussed in this paper. The structure and design of hardware and software are also introduced. The test of a kind of transponder is presented.%介绍了一种机载应答/测距机自动测试系统的设计、组成及功能，论述了其硬件系统组成和软件组织结构，并以应答机为例介绍了检测流程。
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