Improved digital frequency conversion frequency modulation source

The invention provides an improved digital frequency conversion frequency modulation source, which comprises a signal processing module, a data acquisition module, a mixer, a low noise high gain amplifier, a reception antenna, an emission antenna, a linear frequency modulation source and a direct digital frequency synthesizer. The improved digital frequency conversion frequency modulation source effectively overcomes a contradiction between an operating distance and distance resolution of linear frequency modulation signals. Through frequency conversion modulation, the signal output end anti-interference capability can be effectively improved, and possibilities that output signals are intercepted can be reduced. The system exhibits high information carrying capability. Meanwhile, an antenna array is adopted, and devices and antennas do not need motion scanning, the real-time performance of imaging is improved, and three-dimensional imaging can be realized. 本发明提供了种改进型数字变频调频源包括信号处理模块、数据采集模块、混频器、低噪声高增益放大器、接收天线、发