Because of the merits of anti-stealth, anti-reconnaissance, strong survivability and high reliability, the passive detection system based on DTV broadcast has attracted much attention and becomes one kind of efficient supplement to current detection technique. In radar system based on opportunity illuminator, the direct signal and the multipath suppression is one of the key factors influencing the moving target detection performance. In contrast to FM signal, the bandwidth of DTV signal is about 8 MHz, the performance of conventional adaptive cancellation algorithm is decreased because the clutter occupies more range units. Considering this, this paper presents an adaptive algorithm for jamming suppression, using the fractional interpolation. Experimental results on the collected data show the method improves the detection performance that the cancellation ratio increases and the energy of clutter remain decreases 10 dB. The efficacy of the method is demonstrated by offline processing the collected data sets as well as real-time processing via an experimental system.%基于数字电视广播(DTV)的外辐射源探测系统,因为其抗隐身、反侦察、生存能力强和可靠性高等特点,成为现有探测技术的一种有效补充,备受各国重视.外辐射源探测系统中,影响运动目标探测性能的关键因素之一是直达波及多径杂波抑制.相对调频广播信号,数字电视广播信号带宽接近8 MHz,地物杂波占据更多距离单元,常规的自适应对消算法的性能降低.针对这一问题,提出了分数阶自适应杂波相消的算法.基于实测数据的处理结果表明,该算法的对消性能明显改善,剩余杂波能量降低10 dB以上.该算法已经应用于实际工程系统,取得了良好的效果.
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