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为了深入研究物方扫描机构与点目标探测性能的关系,定义了度量扫描机构运动特性的扫描非均匀性指标。根据扫描成像的物理过程,建立了线阵探测器扫描成像模型,并以目标信噪比为核心分析了TDI探测器下扫描非均匀性的影响。首先,根据物方扫描工作特点设置了与扫描机构工作方式相配合的探测器积分时序,并建立了扫描非均匀性度量参量;其次,在经典成像模型的基础上建立了符合积分时序和TDI工作原理的点目标成像模型,并结合探测器噪声模型和TDI工作原理推导了目标信噪比计算公式,通过该公式分析了不同光学系统、TDI级数及目标尺度条件下目标信噪比与扫描非均匀性的关系;最后,从保证能够目标检测性能的角度给出了在相对信噪比限制条件下扫描非均匀性上限。所建立的成像模型准确反映了扫描探测系统各部分特性,分析结果对探测系统的总体设计和指标分配具有指导意义。
In order to further study the relationship between the scanning mechanism of the object and the detection performance of the point target, the scanning nonuniformity index of the movement characteristics of the scanning scanning mechanism is defined. According to the physical process of scanning imaging, the imaging model of the linear array detector was established. The influence of the scanning nonuniformity under the TDI detector was analyzed based on the target signal-to-noise ratio. Firstly, according to the characteristics of the object-side scanning, the integration timing of the detector is set up and the measurement parameters of the scanning inhomogeneity are established. Secondly, based on the classical imaging model, the integration timing and TDI are established Principle point target imaging model, and combined with the detector noise model and TDI working principle derive the target signal-to-noise ratio calculation formula, through which the different optical systems, TDI series and target scale conditions, the target signal-to- Finally, the upper limit of scanning nonuniformity under relative signal-to-noise ratio (SNR) constraints is given from the view of ensuring target detection performance. The established imaging model accurately reflects the characteristics of each part of the scanning detection system, and the analysis results have guiding significance for the overall design of the detection system and the index allocation.