DME询问信号捕获的设计与实现

捕获询问信号是DME地面设备的一个重要功能组成部分。现役的地面设备中大多使用的捕获单元为分离器件电路设计，其电路复杂，控制难度大，改进与维护成本高。针对这些问题，本文设计采用ADC结合FPGA作为主要功能器件，并通过软件算法完成数字滤波、脉冲峰值提取和半幅点计算，实现询问信号的识别与捕获。不仅大幅减少元器件的使用，缩小设备体积，还可提高扩展性与可靠性。结合机柜验证测试，结果符合设计要求。

Design and Implementation of Acquiring DME Interrogating Signal

Acquiring DME interrogating signal is an important part of DME ground equipment.Most of the capture units used in the active ground equipment are designed as separation device circuits,they are complex and difficult to control,high cost of improvement and maintenance.In this paper,ADC and FPGA are used as the main functional devices.It relies on software algorithm to complete digital filtering,pulse peak extraction and half-amplitude calculation,and realizes the recognition and capture of interrogating signal.This scheme not only greatly reduces the number of components and the size of device,but also improves the scalability and reliability.The test results on the cabinet meet the design requirements.