Clutter rejection is a key technique used by passive radars for target detection. Especially when using Single Frequency Network (SFN) configuration, the multipath clutter and ground clutter increase several times more than during a single illuminator situation, which means that the clutter extends in both the spatial and temporal dimensions. The high amount of clutter occupies numerous degrees of freedom when conventional spatial or temporal processing is used, leading to a large array requirement, a huge computational cost, or even a complete failure. This paper investigates a novel subcarrier-based processing technique that is tailored for Orthogonal Frequency Division Multiplex (OFDM) modulation with a Cyclic Prefix (CP-OFDM) to avoid the abovementioned predicament. The algorithm principle is initially illustrated and followed by a discussion about the unique characteristics of Subcarrier-based Spatial Adaptive Processing (SSAP), which include the Doppler response and its unusual main-lobe clutter case. Then, the robustness is researched by evaluating the performance under relaxed basic assumptions. The conclusions are demonstrated by conducting test using simulated and real data sets.
Supported by the National Natural Science Foundation of China (No. 41074116, 41106156, 61271400, and 60971101).
About author: Yi Jian-xin was born in Hunan, China in 1989. He received the B.E. degree in
2011 from Wuhan University, China. He is now a doctoral candidate of Wuhan University. His paper won the 12th China radar annual conference outstanding paper first prize in 2012. His main area of interests is in signal processing of passive radar and over-the-horizon radar.
Wan Xian-rong was born in Hubei, China in 1975. He received the B.E. degree in former Wuhan Technical University of Surveying and Mapping in 1997 and Ph.D. degree in Wuhan University in 2005, China, respectively. He is now a professor and Ph.D. candidate supervisor with Wuhan University. Recent years
he has hosted and participated in more than ten national research projects, and published more than 60 academic papers. His main research interests include design of new radar system such as passive radar, over-the-horizon radar, and array signal processing.
Zhao Zhi-xin was born in Hubei, China in 1986. She received the B.E. degree in 2008 from Wuhan University, China. She is now a doctoral candidate of
Wuhan University. Her main area of interests is in signal processing of overthe-horizon radar and passive radar.
Cheng Feng obtained the B.E. degree in electronic engineering in 1998 and
Ph.D. degree in radio physics in 2006, respectively, both from Wuhan University, China. His main research interests are radar signal processing, radio ocean remote sensing and radar software engineering.
Ke Heng-yu was born in Hubei, China in 1957. He received Ph.D. degree from
Wuhan University in 1996. He is now a professor and Ph.D. candidate supervisor with Wuhan University. His main research interests include electromagnetic radiation and scattering, HF radar ocean remote sensing, radio propagation and antenna.
Cite this article:
Yi Jian-xin,Wan Xian-rong,Zhao Zhi-xin et al. Subcarrier-based Processing for Clutter Rejection in CP-OFDM Signal-based Passive Radar Using SFN Configuration (in English)[J]. JOURNAL OF RADARS, 2013, 2(1): 1-13.
2013, Vol. 2 
