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合成孔径雷达(SAR)由于其自身条件的限制,导致在日常的研究中需要人为的在计算机上对其信号进行一些仿真。在得到的仿真信号中包含着目标的微动信号,这些微动信号对应着目标的微动特性,它们是目标的本质属性,是目标特性研究的重点。而微动特性又会受到目标和雷达参数等的影响,因此,需要对不同参数下目标的微动特性进行研究。主要以机载SAR为模型,构建模型仿真,并对目标参数、雷达参数、仿真参数等进行完整的特性分析。其中仿真主要采用散射点模型,运用采样序列分段置零的仿真方法构建仿真模型;再运用时频分析方法对得到的仿真结果进行特性分析;由于场景中很多参数如PRF、车身速度、车轮半径、散射点采样个数、车身运动方向与方位向夹角等会对目标的微动特性产生影响,因此,改变这些参数再用时频分析方法对不同参数下的仿真结果进行分析,并最后对其进行总结来研究目标的微动特性。
Synthetic aperture radar (SAR) due to its own limitations, resulting in the daily study of the need for artificial in the computer to carry out some of its signal simulation. In the simulation signal obtained contains the target of the fretting signals, these fretting signals correspond to the target’s fretting characteristics, which are the essential attributes of the target, is the focus of the target characteristics of the study. However, the fretting characteristics will be affected by the target and the radar parameters. Therefore, it is necessary to study the fretting characteristics of the target under different parameters. Mainly taking the airborne SAR as a model, the model simulation is constructed, and the complete characteristic analysis of the target parameters, radar parameters and simulation parameters is carried out. In the simulation, the scattering point model is mainly used to build the simulation model by using the sampling sequence piecewise zeroing simulation method. Then the time-frequency analysis method is used to analyze the simulation results. Because of many parameters in the scene such as PRF, body speed, wheel radius , The number of scattering point samples, the angle between the direction of vehicle body motion and the azimuth direction will affect the fretting characteristics of the target. Therefore, the time-frequency analysis method is used to analyze the simulation results under different parameters by changing these parameters. Finally, To summarize to study the purpose of the fretting characteristics.