短波射频数字化接收机的设计与实现

摘要

针对传统中频数字化接收机复杂度高、灵活性差等问题,设计并实现了一种新型短波射频数字化接收机.该接收机由A/D、数字下变频器(DDC)、DSP、D/A、CPLD等几部分组成,实现了短波信号的射频数字化处理.详细介绍了接收机的设计方案,并对常见的调幅(AM)、等幅报(CW)、单边带(ISB)等信号进行了接收测试.在输入电平为-103～0 dB动态范围内,解调输出质量都能达到12 dB左右信纳得(SND).%To overcome the the drawbacks of high complexity and poor flexibility in traditional IF receivers, a novel short -wave(HF) RF receiver is developed, which mainly consists of A/D, DDC, DSP, D/A and CPLD, and realizes the RF - digitalization of HF signals. The design of the receiver is introduced and the receiver performance using AM signal, CW signal and ISB signal is tested. The SND of the output signals can achieve 12 dB when the input level ranges - 103 ～0 dB.