LFM正交调制的FDA-MIMO雷达运动目标检测

FDA-MIMO Radar Moving Target Detection with LFM Orthogonal Modulation

  • 摘要: 频控阵雷达的提出引起了广泛关注,而频控阵多输入多输出(FDA-MIMO)系统是目前来说最可能实现的雷达系统模型。针对FDA-MIMO模型下的运动目标跨距离单元走动问题,本文提出利用keystone变换与FDA-MIMO结合的技术处理该问题。该技术有如下优点:FDA-MIMO可以实现波束角度距离自然解耦,进行二维波束形成准确定位目标角度距离,解决时变因素带来后续匹配滤波造成距离信息丢失的问题;同时与keystone算法结合可以进行距离徙动校正,便于采用多脉冲积累技术提高检测信噪比。理论及仿真结果证明,FDA-MIMO模型与keystone变换结合可以很好地处理运动目标探测中距离徙动问题,提高微弱低可观测目标的检测概率。

     

    Abstract: The proposal of frequency diversity array radar has attracted much attention, frequency diversity array-multiple input multiple output (FDA-MIMO) system is the most likely radar system model to be applied now. For the problem of moving target walking across range unit under FDA-MIMO model, this paper proposes to use the keystone transformation combined with FDA-MIMO to deal with it. This technology has the following advantages: FDA-MIMO can decouple angle-range beam naturally, accurately locate the targets’ angle-range by two-dimensional beamforming and solve the problem of range information loss caused by time-varying factors after matching filtering . The keystone algorithm can be combined with FDA-MIMO to rectify range migration, which facilitates the adoption of multi-pulse accumulation technology to improve the detection signal-to-noise ratio. Theoretical and simulation results show that the combination of FDA-MIMO and keystone transformation can well deal with the range migration problem of moving target detection and improve the detection probability of weak and low observable targets.

     

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