Stepped frequency continuous wave radar-data preprocessing
Stepped frequency continuous wave radar-data preprocessing
复制标题
步进频率连续波雷达数据预处理
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
P. Hakkaart
中科院分区：
文献类型：
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作者：
I. Nicolaescu;P. van Genderen;K. V. van Dongen;J. van Heijenoort;P. Hakkaart
自二战结束以来，雷达系统受到了广泛的关注。沿着其性能的提高，其应用范围也越来越广泛，从目标探测、参数测量到导航、防撞、水下探测等。考虑到遍布世界各地的地雷数量及其对人类构成的危险，最后一项应用对人道主义排雷目的具有重大意义。连续波和脉冲雷达都已用于地雷探测。本文研究了频率步进连续波雷达，工作频率为400 ~ 4845 MHz，步进频率为35 MHz。该系统的新奇之处在于同时传输8个频率，这大大减少了数据采集时间。由于地气界面的强烈反射，人们可能难以“看到”埋在地面上或就在地面之下的地雷。如果天线系统覆盖区比地雷的尺寸大得多，这甚至更加困难，因为来自地雷的信号将被掩埋在杂波信号中。为了去除杂波信号，提高信杂比，人们研究了平均杂波相减和合成孔径雷达。
Radar systems have been paid a lot of attention since the end of WWII. Along with performances improvement one has witnessed a diversification of their applications, which range from target detection and parameter measuring to navigation systems, anti-collision systems and subsurface sensing. The last application has had a great importance for humanitarian demining purposes taken into account the number of landmines spread across the world and the danger they pose to humans. Both, continuous wave and pulse radar have been employed for landmine detection. This paper deals with stepped frequency continuous wave (SFCW) radar that operates from 400 MHz to 4845 MHz, in steps of 35 MHz. The novelty of the system, built at International Research Center for Telecommunication-transmission and Radar (IRCTR), consists in the fact that 8 frequencies are transmitted simultaneously, which drastically decreases the data acquisition time. Because of the strong reflection from the air-ground interface one may face some difficulties to "see" the landmines, which are lying on, or just below of the surface. If the antenna system footprint is much more larger than the size of the mine, this is even more difficult as the signal from the mine will be buried in the clutter signal. In order to remove the clutter signal and to improve signal to clutter ratio, average clutter subtraction and synthetic aperture radar have been investigated.