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外辐射源雷达(无源雷达、被动雷达)是当前的研究热点之一,国标数字电视地面广播(DTTB)的正式启动给外辐射源雷达创造了新的发展空间。DTTB系统有单载波和多载波两种应用模式。文中分析两种应用模式下的钉板型DTTB信号模糊函数,得到副峰产生的原因,推导副峰的相对位置及幅度与信号参数之间的对应关系。为避免副峰干扰引起的虚警,提出一种基于相对幅度和位置的副峰峰识别方法。实测信号的处理结果表明所提方法可有效地识别副峰,且不会引起功率损失。文中的研究成果为基于DTTB的外辐射源雷达的设计提供了依据。
External radiation source radar (passive radar, passive radar) is one of the current research hot spots. The official launch of the national standard digital terrestrial television broadcasting (DTTB) has created a new space for development of external radiation source radar. DTTB system has a single carrier and multi-carrier two application modes. In this paper, we analyze the fuzzy function of the DTTB signal of the nail plate type under the two application modes to get the reason of the secondary peak and deduce the corresponding relationship between the relative position and amplitude of the secondary peak and the signal parameters. In order to avoid the false alarms caused by the secondary peak interference, a method of identifying secondary peak peaks based on relative amplitude and position is proposed. The measured signal processing results show that the proposed method can effectively identify the secondary peak, and will not cause power loss. The research results in this paper provide the basis for the design of DTTB-based external radiation source radar.