全极化微波辐射计数字相关器下变频算法设计

全极化微波辐射计是一种用于海洋表面风场测量的新型被动微波遥感器,数字相关器是全极化辐射计的核心部件。针对全极化微波辐射计接受到的数字信号采样率较高的问题,提出应用多相滤波的算法以降低数字信号速率,从而满足FPGA时序约束的要求。之后为进一步节省乘法器资源和提高处理速率,滤波部分采用分布式算法,两种方法结合完成下变频模块处理,通过Matlab软件对下变频算法进行了仿真。仿真结果表明算法是可行的。

The design of down-converting algorithm for polarimetric microwave radiometer digital correlator

Polarimetric microwave radiometer is a species of sea surface wind field measurement for the novel passive microwave remote sensor, a digital correlator is the core component of polarimetric radiometer. For the polarimetric microwave radiometer received digital signal sampling rate higher, puts forward the application of polyphase filter algorithm to reduce the rate of digital signal, so as to meet the requirements of FPGA timing constraints. After further save multiplier resources and improve the treatment rate, filter part uses the distributed algorithm, two methods are combined to complete the conversion module, through the Matlab software.