Long-data DFT and Its Application in Radar Reconnaissance Receiver

摘要：

Limited by the computing speed of FFT (Fast Fourier Transform),Short-data DFT(Discrete Fourier Transform) is often used in radar reconnaissance digital receiver.But for larger N,the number of sample points,is selected,not only windows effect is reduced and frequency resolution is improved,but also export that the frequency domain signal to noise ratio is N times increase of time-domain.So when N is a greater value,using DFT measuring frequency algorithm can detect small signal submerged in the noise.A realization scheme is given based on the big point DFT radar reconnaissance digital receiver,and export the quantitative relationship about sense pulse modulation radar signals.With the development of component technology and improvement of algorithm,long-data DFT has sufficient computing speed now,which provides the probability of its application in digital receiver.Long FFT use generally 2-dimension algorithm and its implementation method on FPGA are also talked about.

关键词： digital receiver DFT windows effect signal to noise ratio FFT

作者: Zhang Jing-miao Cao Shu-fu Gao Shuang-xi

作者单位: Computer Center,Hebei University of Economics & Business Hebei Shijiazhuang,China Information Technology College,Hebei University of Economics & Business,Hebei Shijiazhuang,China

会议类型: 国际会议

会议名称: 第八届电磁理论、天线及传播国际研讨会

会议地点: 昆明

会议语种:英文

在线出版日期: 2008-11-01（万方平台首次上网日期，不代表论文的发表时间）