Design and Implementation of Digital Correlator for CAS Synthetic Aperture Radiometer

摘要：

We present a new method of digital correlation,which uses the technology of direct intermediate frequency or radio frequency sampling and digital phase shift. Digital correlators down-sample IF or RF signals with 3-bit analog-to-digital converters and then delay one sampling interval for quadrature phase shift. Following the same procedure as analog correlation, the digitalized I/Q pairs are processed in a FPGA chip. Analysis and simulations show that sample delay introduces linear phase offset which is proportional to the deviated frequency from the center of digital IF. Derived equation proves that linear phase offset can be compensated simply by a SINC function. Flight tests conducted in April 2004 achieved image as we expected.

作者: Jingye Yan Ji Wu Hao Liu Xiaolong Dong Jingshan Jiang

作者单位: Center for Space Science and Applied Research,Chinese Academy of Sciences

会议类型: 国际会议

会议名称: Progress in Electromagnetics Research Symposium 2005(2005年电磁学研究新进展学术研讨会)(PIERS 2005)

会议地点: 杭州

会议语种:英文

页码: 520-523

在线出版日期: 2005-08-22（万方平台首次上网日期，不代表论文的发表时间）