基于FPGA的多相数字基带转换器设计与实现

Design and implementation of polyphase digital baseband converter based on FPGA

介绍了深空测控系统中数字基带转换器的原理及作用。在研究△DOR对航天器跟踪测轨原理的基础上,根据其信号频谱特征选择围绕多相信道化滤波器组来设计数字基带转换器。算法实现过程中,利用实信号谱以π为周期互为镜像的特点解决了接收信道存在盲区的问题。硬件实现前在Matlab环境下对算法进行验证。仿真正确后利用DSP Builder和Quartus II两种软件混合编程方式编写硬件程序。最终在数据回放板上验证了算法的可行性,为研究VLBI(Very Long Baseline Interfer-ometry)测量技术提供了测试平台。

Describing the principle and effect of digital baseband converter for deep-space surveying and control system. Choosing the polyphase channelized filter banks to design digital baseband converter based on the research of J DOR principle in spacecraft tracking ＆ orbit-measurement and the signal spectrum characteristic. In the process of realizing the arithmetic, using the characteristic about the real signal spectrum＇s mirror images of one another in periods of to solve the problem of blind frequency zone which appears when receiving the signal. Before realizing the hardware, use Matlab to check the arithmetic. After simulating correctly, use DSP Builder ＆ Quartus Ⅱ to write hardware program in mixed programming. At last, check the feasibility of arithmetic on a data playback board to provide a platform of researching VLBI（Vcry Long Baseline Interferometry） measuring technique.