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In this paper, a focusing approach is presented to widen the use of efficient monostatic imaging algorithms for azimuth-invariant
bistatic synthetic aperture radar (SAR) data. The bistatic range history is modeled by a polynomial of azimuth time. Using
this model, an analytic form of the signal spectrum in the 2D frequency domain is derived, and a simple single-valued relation
between the transmitter and receive ranges is established. In this way, a lot of monostatic image formation algorithms can
be extended for the bistatic SAR data, and a bistatic chirp scaling algorithm is developed as an application of the new approach.
This algorithm can be used to process the azimuth-invariant bistatic configuration where the transmitter and receiver platforms
are moving on parallel tracks with the same velocity. In addition, some simulation results are given to demonstrate the validity
of the proposed approach. 相似文献
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建立了双基地雷达的空间几何模型,基于双基地雷达LFM脉冲信号的模糊函数,导出了其距离分辨力和速度分辨力的关系表达式.理论分析和仿真结果表明双基地雷达LFM脉冲信号的距离分辨力和速度分辨力与目标双基地角有关,减小接收基地视角和短基线长度可以获得高的双基地雷达分辨力. 相似文献
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推导了BiSAR的dechirp公式,建立了BiSAR的回波信号模型,分析了BP成像算法的原理和运算效率,给出了BP成像算法的主要步骤。当双基地角为90°时,进行了仿真。通过对点目标PSF定量分析,验证了BP成像算法在BiSAR下具有良好的聚焦效果。 相似文献
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与双站条带SAR相比,双站聚束SAR只要有足够的聚束时问,理论上就可以达到理想的方位分辨率,不受收、发天线波束宽度和天线尺寸大小的影响,文中主要研究双站聚束SAR方位分辨特性、波束压缩比等,并给出了相关数学解和仿真结果。 相似文献
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针对移变模式下的双基地合成孔径雷达成像方法及电磁仿真进行了研究。在这一模式下对双基地SAR信号频谱进行分析,结合改进的Loffeld模型进行点目标回波信号分析及成像仿真。与此同时,通过物理光学方法获得三维目标的双基地回波信号,在此基础上分别采用原始与改进的Loffeld模型进行了双站SAR电磁成像仿真实验。点目标及电磁仿真结果均表明,与传统的Loffeld模型相比,改进的Loffeld模型在双基地移变模式下具有更为优良的聚焦性能。 相似文献