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长时间相参积累是数字阵列雷达等新体制雷达提高目标检测性能的主要途径之一,但必须有效补偿目标回波在长观测时间内跨距离单元、跨Doppler单元等效应。基于目标频域信号模型,该文提出了一种径向匀加速目标长时间相参积累方法。该方法在每个脉冲回波频域对目标跨距离单元、跨速度单元进行回波包络与Doppler相位的联合补偿,实现了对径向匀加速度目标回波的有效积累。该方法显著改善了雷达对径向加速目标的检测性能,具有补偿精度高、易于并行化等特点,适于工程实现。数值实验验证了该方法的有效性。
Long time coherent accumulation is one of the main approaches to improve the target detection performance of new system radar such as digital array radar. However, it is necessary to effectively compensate for the effect of cross-range elements and cross-Doppler elements over long observation time. Based on the target frequency-domain signal model, a long-time coherent integration method for radial uniform acceleration target is proposed. In this method, joint compensation of echo envelope and Doppler phase of target cross-range units and cross-speed units is implemented in each pulse echo frequency domain to achieve effective accumulation of radial uniform acceleration target echoes. The method significantly improves the detection performance of the radar on the radial acceleration target, has the characteristics of high compensation accuracy and easy parallelization, and is suitable for engineering implementation. Numerical experiments show the effectiveness of this method.