为设计一种通用的无线电导航系统信号模拟器，同时实现微波着陆系统测试设备的小型化与数字化，采用软件无线电的思想，基于现场可编程门阵列(FPGA)设计了一种可编程实时微波着陆信号模拟器。模拟器以单片FPGA为主控芯片，利用串口与上位机软件通信，获取信号参数，并由FPGA生成数字基带信号，配合高性能数模转换器AD9777和宽带正交调制器ADL5375实现信号的模拟。对微波着陆信号的FPGA实现进行了全面的研究，对FPGA实现中难点问题的解决方法和采用的关键技术进行了详细介绍，并利用Modelsim 10.1a对设计进行了验证，证明设计达到预期效果。

To design a commonly-used radio navigation signal simulator,and realize the miniaturization and digitization of test equipment of microwave landing system,a programmable and real-time microwave landing system signal simulator was designed based on Field Programmable Gate Array (FPGA).The simulator uses FPGA as the main control chip.Signal parameters are obtained by serial port communication with PC software.Digital baseband signal is generated by FPGA,and signal simulation is realized through the high-performance analog-to-digital converter AD9777 and the broadband quadrature modulator ADL5375.The realization of microwave landing system signal by FPGA is studied thoroughly,including the solution to the difficult problems in FPGA implementation and the key technologies.The design has been verified by Modelsim 10.1a,and the test results show that the design of signal simulator achieves the expected effect.