【摘要】 通信事业的发展使得频率低端无线频谱已十分拥挤,同时对大容量、远距离、高可靠性提出较高要求,毫米波以其频段宽、空间分辨率高、干扰和截获概率低等特点被应用到各个领域。在研究毫米波发射机原理的基础上提出一种采用两次变频法的上变频设计方案,将中频70 MHz上变频至31 GHz,并利用FPGA完成了基带数字信号处理,控制AD9857实现了中频调制设计。更多还原

【Abstract】 The millimeter-wave with characteristics of wide band,high spatial resolution,low interference and interception probability are applied to various fields since the development of communication.A design scheme of up converter with two frequency method based on the principle of millimeter-wave transmitter is proposed,IF of 70MHz is up conversion to 31GHz,and the FPGA is used to complete the base-band digital signal processing,the AD9857 is controlled to design the IF modulation.更多还原