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中文摘要：
传统二次雷达A／C模式解码都是基于询问一应答的合作模式，且有空间滤波，解码相对容易。对于非合作的纯接收系统如何对A／C应答进行解码，提出了一种在基带进行相关处理的解码方法，可在非合作的情况下对A／C应答进行有效解码，同时还可以通过改变门限的大小来满足不同场合的精度要求。另外还提出了A／C模式应答码的识别方法，该方法在多点定位中具有重要的应用价值。
英文摘要：
Traditional secondary radar decoding of A/C mode is based on the cooperation of inquiry-response model, and has spatial filtering, which is easy for decoding. A decoding method of coherent processing in the base band is proposed to solve the problem of how to decode the A/C response of non-cooperative reception system. The method can also meet the requirement of accuracy in different occasions through change the threshold. In addition, a recognition method of A/C mode answerback code is proposed, which has important application value in multi-point location.
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