一种机载外辐射源雷达微弱目标检测方法

发布时间：2018-05-25 11:13

本文选题：外辐射源雷达 + 机载雷达　；参考：《西安交通大学学报》2017年02期

【摘要】：针对机载外辐射源雷达系统中直达波信号参数估计误差导致的杂波抑制性能下降、微弱目标检测性能恶化的问题,提出了一种机载外辐射源雷达体制下微弱目标检测方法。该方法在建立杂波和微弱运动目标信号模型的基础上,对重叠分段后的两通道信号进行匹配滤波,然后分别对两通道信号进行Keystone变换完成相对径向速度的距离徙动校正,最后构造通道间相位偏差补偿函数,并结合两通道相位中心偏置天线(DPCA)方法解决杂波剩余问题。仿真结果表明:考虑直达波参数估计误差的影响能够提高微弱目标检测能力;在载机偏航角为2°的情况下,该方法与忽略相位偏差的传统DPCA方法和理论值补偿相位偏差的DPCA方法相比,检测信噪比分别提高了12dB和7dB以上。
[Abstract]:Aiming at the degradation of clutter suppression performance and the deterioration of weak target detection performance caused by the estimation error of direct wave signal parameters in airborne external emitter radar system, a weak target detection method under airborne external emitter radar system is proposed. Based on the model of clutter and weak moving target signal, the two channel signals after overlapping segmentation are matched and filtered, and then the range migration correction of relative radial velocity is accomplished by Keystone transform of the two channel signals respectively. Finally, the phase offset compensation function between channels is constructed, and the residual clutter problem is solved by combining the two-channel phase center bias antenna DPCA. The simulation results show that the weak target detection ability can be improved by considering the influence of the estimation error of direct wave parameters, and when the yaw angle of the carrier is 2 掳, Compared with the traditional DPCA method which neglects the phase deviation and the DPCA method whose theoretical value compensates the phase deviation, the signal-to-noise ratio (SNR) of this method is higher than that of 12dB and 7dB, respectively.
【作者单位】：西安电子科技大学雷达信号处理国家重点实验室;
【基金】：国家自然科学基金资助项目(61401526)
【分类号】：TN957.51

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