微波散射计数字接收机DDC的设计与实现

Design and Implementation of DDC in Digitized Receiver of Microwave Scatterometer

微波散射计是一种用于测量目标后向散射系数的有源微波遥感器。文章介绍了作为微波散射计重要部件之一的数字化中频接收机,指出数字下变频在微波散射计数字化中频接收机的数字化和软件化过程的作用。根据微波散射计数字化中频接收机工作机理与数字下变频原理,结合Matlab算法仿真技术,设计并实现了基于FPGA IP核的数字下变频。仿真与实测结果表明:基于FPGA IP核设计实现的数字下变频能够满足微波散射计数字化中频接收机性能指标要求,并且具有灵活性、通用性、修改参数方便等特点。

Microwave scatterometer is a kind of active microwave remote sensor which is used to measure back-scatter coefficient of target. This paper introduces the digitized intermediate frequency receiver that is one importance components of Microwave scatterometer, and points out that digital Down Converter （DDC） plays a key role in the digitized and software oriented process of the digitized intermediate frequency receiver. Based on work principium of the digitized intermediate frequency receiver of Microwave scatterometer and the principle of digital down conversion, and combinated with Matlab design and simulation technique, digital down converter based on FPGA IP core is designed and realized in this paper. Simulation and test results indicate that design and implementation of DDC based on FPGA IP core can satisfy performance requests of the digitized intermediate frequency receiver of microwave scatterometer, the design have be characteristic of. agility, universality and modifying parameter easily.