共查询到9条相似文献,搜索用时 62 毫秒
1.
2.
3.
4.
5.
一种改进的红外焦平面非均匀性校正算法 总被引:6,自引:1,他引:6
针对红外焦平面探测器现有非均匀性校正算法在实际应用中存在的问题,结合实际系统的开发,提出了一种改进算法——一点加两点校正算法。先求两点校正算法的校正增益和校正偏置,再求一点校正算法的校正偏置,求取一点校正算法的偏置参数时的图像数据来自前面求得的两点校正之后的数据,即最后的校正结果是两点校正后的再校正。理论分析和应用表明该算法与目前流行的算法相比具有实时性好、误差小、处理效果好等特点。 相似文献
6.
7.
基于MAPES的非均匀多基线SAR三维成像算法 总被引:1,自引:0,他引:1
多基线合成孔径雷达(Synthetic Aperture Radar,SAR)通过在高度方向上的多次重复飞行形成了对目标观测的高度向合成孔径,具有高度向分辨能力,能够实现对目标的三维成像.本文针对各条轨迹非等间隔分布的多基线SAR数据,提出了基于缺失数据向量幅度和相位估计(Missing-data Amplitude and Phase Estimation,MAPES)的非均匀多基线SAR的三维成像算法.根据多基线SAR三维成像的信号模型和基于谱估计的三维成像原理,引人MAPES算法对非均匀采样的目标高度向观测数据进行空间谱估计,实现对目标的高程成像,从而得到了基于MAPES算法的非均匀多基线SAR三维成像处理流程.使用MAPES算法对非均匀多基线SAR的仿真数据和微波暗室数据进行了三维成像实验. 相似文献
8.
9.
The traditional Range Doppler (RD) algorithm is unable to meet practical
needs owing to the limit of resolution. The order of fractional Fourier Transform (FrFT)
and the length of sampling signals affect SAR imaging performance when FrFT is
applied to RD algorithm. To overcome the above shortcomings, the purpose of this paper
is to propose a high-resolution SAR image algorithm by using the optimal order of FrFT
and the sample length constraints for the range direction. The expression of the optimal
order of SAR range signals via FrFT is deduced in detail. The initial sample length and
its constraints are proposed to obtain the best sample length of SAR range signals.
Experimental results demonstrate that, when the range sampling-length changes in a
certain interval, the best sampling-length will be obtained, which the best values of the
range resolution, PSLR and ISLR, will be derived respectively. Compared with
traditional RD algorithm, the main-lobe width of the peak-point target of the proposed
algorithm is narrow in the range direction. While the peak amplitude of the first side-lobe
is reduced significantly, those of other side-lobes also drop in various degrees. 相似文献