Introducing frequency agility into a distributed multipleinput multiple-output(MIMO)radar can significantly enhance its anti-jamming ability.However,it would cause the sidelobe pedestal problem in multi-target paramet...Introducing frequency agility into a distributed multipleinput multiple-output(MIMO)radar can significantly enhance its anti-jamming ability.However,it would cause the sidelobe pedestal problem in multi-target parameter estimation.Sparse recovery is an effective way to address this problem,but it cannot be directly utilized for multi-target parameter estimation in frequency-agile distributed MIMO radars due to spatial diversity.In this paper,we propose an algorithm for multi-target parameter estimation according to the signal model of frequency-agile distributed MIMO radars,by modifying the orthogonal matching pursuit(OMP)algorithm.The effectiveness of the proposed method is then verified by simulation results.展开更多
针对调频斜率捷变的线性调频(linear frequency modulation,LFM)信号先进体制雷达多假目标干扰需求,提出了基于间歇采样转发与双向移频调制联合处理的位置恒定式LFM雷达假目标群干扰方法。将雷达截获信号同时与两路时间延迟信号混频求频...针对调频斜率捷变的线性调频(linear frequency modulation,LFM)信号先进体制雷达多假目标干扰需求,提出了基于间歇采样转发与双向移频调制联合处理的位置恒定式LFM雷达假目标群干扰方法。将雷达截获信号同时与两路时间延迟信号混频求频差,获取随调频斜率自适应变化的间歇采样频率和移频调制量;依次进行间歇采样转发处理和双向移频调制处理获得干扰信号。经理论分析与仿真实验验证,针对调频斜率捷变等先进体制LFM雷达,该干扰方法产生的假目标群位置恒定,有利于在脉冲积累时形成较好的干扰效果,且相比单独间歇采样转发或移频干扰,假目标群覆盖范围可以更广,具有实际工程应用价值。展开更多
针对捷变频信号的相参积累处理进行研究,提出了一种基于频率分组编码信号的相参积累算法。以线性调频(Linear frequency modulation,LFM)信号为基础,构建了频率分组编码信号,使得发射信号的脉冲载频序列具有一定随机性,保证了波形的抗...针对捷变频信号的相参积累处理进行研究,提出了一种基于频率分组编码信号的相参积累算法。以线性调频(Linear frequency modulation,LFM)信号为基础,构建了频率分组编码信号,使得发射信号的脉冲载频序列具有一定随机性,保证了波形的抗干扰能力。同时针对频率捷变信号相位非相参带来的主瓣展宽和旁瓣抬高问题,设计了对应编码信号的相参处理方法。首先对回波脉压后的信号进行高分辨距离补偿,然后通过速度遍历插值和距离一致性校正实现脉组内相参处理,最后利用编码信号载频序列的优势实现脉组间相参处理。在仿真实验中,对构建的编码信号相较于LFM信号在抗干扰方面的优越性进行了验证,同时验证了所提相参处理方法相较于基于压缩感知的稀疏重构算法的有效性。展开更多
文摘Introducing frequency agility into a distributed multipleinput multiple-output(MIMO)radar can significantly enhance its anti-jamming ability.However,it would cause the sidelobe pedestal problem in multi-target parameter estimation.Sparse recovery is an effective way to address this problem,but it cannot be directly utilized for multi-target parameter estimation in frequency-agile distributed MIMO radars due to spatial diversity.In this paper,we propose an algorithm for multi-target parameter estimation according to the signal model of frequency-agile distributed MIMO radars,by modifying the orthogonal matching pursuit(OMP)algorithm.The effectiveness of the proposed method is then verified by simulation results.
文摘针对调频斜率捷变的线性调频(linear frequency modulation,LFM)信号先进体制雷达多假目标干扰需求,提出了基于间歇采样转发与双向移频调制联合处理的位置恒定式LFM雷达假目标群干扰方法。将雷达截获信号同时与两路时间延迟信号混频求频差,获取随调频斜率自适应变化的间歇采样频率和移频调制量;依次进行间歇采样转发处理和双向移频调制处理获得干扰信号。经理论分析与仿真实验验证,针对调频斜率捷变等先进体制LFM雷达,该干扰方法产生的假目标群位置恒定,有利于在脉冲积累时形成较好的干扰效果,且相比单独间歇采样转发或移频干扰,假目标群覆盖范围可以更广,具有实际工程应用价值。
文摘针对捷变频信号的相参积累处理进行研究,提出了一种基于频率分组编码信号的相参积累算法。以线性调频(Linear frequency modulation,LFM)信号为基础,构建了频率分组编码信号,使得发射信号的脉冲载频序列具有一定随机性,保证了波形的抗干扰能力。同时针对频率捷变信号相位非相参带来的主瓣展宽和旁瓣抬高问题,设计了对应编码信号的相参处理方法。首先对回波脉压后的信号进行高分辨距离补偿,然后通过速度遍历插值和距离一致性校正实现脉组内相参处理,最后利用编码信号载频序列的优势实现脉组间相参处理。在仿真实验中,对构建的编码信号相较于LFM信号在抗干扰方面的优越性进行了验证,同时验证了所提相参处理方法相较于基于压缩感知的稀疏重构算法的有效性。
