Daniels D J. Ground Penetrating Radar. The Institute of Engineer Engineers, London, United Kingdom, Michael Faraday House, 2004: 3-4.Charlotte Corbel, Svein-Erik Hamran, and Richard Ney, et al.. The WISDOM UHF GPR on ExoMars mission. 11th International Conference on Ground Penetrating Radar, Columbus Ohio, USA, June 19-22, 2006: 15-20.Aftanas Michal. Imaging of the building contours with through the wall UWB radar system. Radio Engineering, 2009, 18(3): 258-264.Kazunori Takahashi and Motoyuki Sato. A hand-held dual- sensor system using impulse GPR for demining. Proceedings of the 2008 IEEE International Conference on Ultra- Wideband (ICUWB2008), Germany, September 10-12, 2008: 157-160.Andreas Loizos and Christina Plati. Ground penetrating radar: a smart sensor for the evaluation of the railway trackbed. Instrumentation and Measurement Technology ConferenceIMTC 2007Warsaw, Poland, May 1-3, 2007: 1-6.Zetik R, Sachs J, and Thom. R S[J].UWB short-range radar sensingThe architecture of a baseband, pseudo-noise UWB radar sensor. IEEE Instrumentation Measurement Magazine.2007, 4:39-45Sachs J and Badstbner A. High resolution non-destructive testing in civil engineering by ultra-wideband pseudo-noise approaches. Proceedings of the 2008 IEEE International Conference on Ultra- Wideband (ICUWB2008), Germany, September 10-12, 2008: 137-140.Yoshiyuki Tomizawa and Ikuo Arai. Coded pulse signal subsurface radar. Electronics and Communications in Japan, 2002, Part 1, 85(2): 8-16.Ana Vazquez Alejos and Dawood Muhammad, et al.. Ground Penetration Radar using Golay Sequence. 2007 IEEE Region 5 Technical Conference, Fayetteville, AR, April 20-21, 2007: 318-321.Ing. Michal Aftanas. Through wall imaging using M-sequence UWB radar system. [Ph.D. disertation], Technical University at Kosice, 2007.Bianchi C, Sciacca U, and Zirizzotti A, et al.. Signal processing techniques for phase-coded HF-VHF radars. Annals of Geophysics, 2003, 46(4): 697-705.张群英，方广有，尹肖飞. 一种伪随机序列在探地雷达应用中回波数据预处理方法. 中国专利, 200810227477.8, 2008. Zhang Qun-ying, Fang Guang-you, and Yin Xiao-fei. An Pre-processing algorithm of Pesduo random sequences echo in GPR. China Patent 200810227477.8, 2008.Ming Yan, Mao Tian, and Lu Gan, et al.. Impulse ground penetrating radar hardware system design, Proceedings of 6th Intermational Coference on ITS Teleconnunuications, Taiwan, June 26-30, 2006: 1244-1247.Aftanas M, Rovnakova J, and Riskova M, et al.. An analysis of 2D target positioning accuracy for M-sequence UWB radar system under ideal conditions. Proceedings of 7th International Conference Radioelektronika, Brno, Czech Republic, Apr. 2007: 189-194.