基于DDS IP核的无线电罗盘天线信号模拟器的设计与实现

Design and implementation of radio compass antenna signals simulator based on DDS IP core

为了对某型机载无线电罗盘进行测试与维修,提出了一种基于DDS IP核的通用无线电罗盘天线信号模拟器的设计方法。首先讨论了无线电罗盘天性信号的格式与特点,然后利用FPGA中的DDS IP核来合成符合规范的无线电罗盘模拟信号,并在Lab Windows/CVI平台上开发了上位机软件,实现人机交互功能,可方便、灵活地对输出信号的频率、方位角和调幅系数等参数进行设置。最后用示波器对设计的无线电罗盘天线信号模拟器进行了测试,测试结果表明其各项参数都能达到设计要求,同时精简了硬件结构、节约了FPGA逻辑资源,并且控制更加灵活。

In order to test and repair a kind of airborne radio compass,a design method of universal radio compass signal simulator based on DDS IP core is proposed.Firstly,the format and characteristics of the radio compass signal are discussed.Then,the DDS IP core in the FPGA is used to synthesize the conformal radio compass simulation signal.The host computer software is developed on the Lab Windows/CVI platform to realize the human-computer interaction function.User can set easily and flexibly on the output signal frequency,azimuth and modulation coefficients and other parameters.Finally,the design of the radio compass antenna signal simulator was tested with the oscilloscope.The test results show that the parameters can meet the design requirements,the hardware structure is compact,the FPGA logic resources are saved,and the control is more flexible.