DME应答接收机技术研究

Research on receiver technology for distance measuring equipment

应答接收机是通用航空测距机地面设备的核心,接收来自飞机的高斯脉冲对测量其与地面台之间的距离。接收机采用数字化、模块化的设计方法,按功能划分成不同的模块,以FPGA为核心进行设计。将设计分为接收机通道部分和后端信号处理部分两大模块,其中,接收机通道部分又分为射频处理、半幅检波等模块;后端信号处理部分又分为译码编码、莫尔斯识别脉冲生成、发射脉冲优先权控制等模块。经测试表明,电路性能稳定,工作可靠。

The receiver is the core of distance measuring equipment（ DME）, and the main functions need to realize include receiving the Gauss shaped interrogation pulse from the aircraft, in order to measure the distance from the aircraft. The dissertation mainly studies the DME receiver technology, using digital and modular design method, dividing it into different modules according to the function, and dividing the design into digital front-end and signal processing section. Among them, digital front-end is composed of RF processing module, semi amplitude demodulation module; the back-end signal processing is composed of coding and decoding module, Morse identification pulse generating module, transmitting pulse priority control module. Testing shows the circuit operates with stable performance and high reliability.