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为了提高杂波环境下的扩展目标检测性能,提出了一种雷达发射波形的自适应设计方法。建立了参数化模型来表征雷达接收端的观测。根据对回波统计特性的分析,提出了目标冲激响应和杂波协方差的估计方法,并构建了一种广义似然比检测器。为了充分发挥雷达发射机的功率极限,进一步提出了一种相位调制波形的自适应设计方法,使所设计的波形应用在下一次发射时能够抑制杂波的影响,提高目标检测性能。仿真实验结果表明:相比传统雷达系统中广泛采用的固定波形,该自适应波形设计算法能够获得更高的回波信杂噪比,改善了扩展目标的检测性能。
In order to improve the detection performance of extended target in clutter environment, an adaptive design method of radar emission waveform is proposed. A parametric model was established to characterize the radar receiver observations. Based on the analysis of the statistical characteristics of the echoes, a method to estimate the target impulse response and clutter covariance is proposed, and a generalized likelihood ratio detector is constructed. In order to give full play to the power limit of radar transmitter, an adaptive design method of phase modulation waveform is proposed. The designed waveform can suppress the influence of clutter and improve the target detection performance when applied to the next transmission. The simulation results show that the adaptive waveform design algorithm can achieve higher echo signal-to-noise ratio and improve the detection performance of the extended target compared with the fixed waveform which is widely used in the traditional radar system.