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目的:为无源雷达提出新的目标检测方法,改善无源雷达的目标检测性能,丰富无源雷达目标检测方法库。创新点:首次提出基于倒谱技术的无源雷达动目标检测(CEPMTD)方法。在CEPMTD算法的基础上,为获得更高的目标检测性能,进而提出了改进的CEPMTD算法。方法:首先,将传统倒谱技术加以改进和扩展,使其具有运动目标检测的能力。然后,在该方法基础上,提出改进的CEPMTD算法,利用相同的回波信号和参考信号,通过改变它们之间的相对延时,构建不同的合成信号。对于每个合成信号利用CEPMTD算法进行目标检测,将每次输出的结果按照一定的规则相干累加。运动目标的真实峰值相干累加,而旁瓣和副峰则非相干叠加。最后,利用仿真和试验数据对本文方法进行验证。结论:理论分析结果显示改进的CEPMTD算法的目标检测性能优于雷达模糊函数,仿真和试验结果验证了理论分析结果。
Objective: To propose a new target detection method for passive radar, to improve the target detection performance of passive radar and to enrich the library of passive radar target detection methods. Innovation: The first time based on cepstrum passive radar moving target detection (CEPMTD) method. On the basis of CEPMTD algorithm, in order to obtain higher target detection performance, an improved CEPMTD algorithm is proposed. Methods: Firstly, the traditional cepstrum technique was improved and extended to make it have the ability of moving target detection. Then, based on this method, an improved CEPMTD algorithm is proposed, which uses the same echo signal and reference signal to construct different synthesized signals by changing the relative delay between them. CEPMTD algorithm for each composite signal for target detection, the results of each output in accordance with certain rules of coherent accumulation. The true peak of the moving target is coherently added while the side lobe and the secondary peak are non-coherently superimposed. Finally, the simulation and experimental data are used to verify the proposed method. Conclusion: The theoretical analysis shows that the target detection performance of the improved CEPMTD algorithm is better than that of radar ambiguity function. The simulation and experimental results verify the theoretical analysis results.