200MHz带宽压缩接收技术研究

Study on Compressive Receiver with Bandwidth of 200 MHz

从傅氏变换基本公式出发,介绍了以色散延迟线(SAW DDL)器件通过"相乘-卷积-相乘(M-C-M)"方式实现傅氏变换的方法。以线性调频(chirp)傅氏变换为基础,研制了测频带宽大于200 MHz、频率分辨小于5 MHz、适应100 ns脉冲的接收机用测频模块,同时给出了样品实验结果和测试波形图,并进一步探讨了改进性能的途径。

From the basic formula of Fourier transform, a method of realizing Fourier transform was introduced by using SAW dispersive delay line （SAW DDL） through the way of ＂multiple-convolution-multiple （M-C-M）＂. Based on the chirp Fourier transform, a frequency measuring module used in the receiver was developed. The mod- ule had a frequency measuring bandwidth of bigger than 200 MHz, frequency resolution of less than 5 MHz and was adaptive to the pulse of 100 ns. The experiment results and the measuring waveform diagram were also presented in this paper. The way of further improving the performance of frequence measuring module was discussed.