CAJ | 학술논문

针对振动环境中星敏感器曝光得到的模糊星像点质心提取精度低的问题，提出了惯性信息辅助的星像点质心提取模型并建立了相应的算法。算法以星像点区域的加权中心为曝光初始时刻的星像点质心，根据与星敏感器捷联的惯性设备测得的振动信息计算质心在曝光过程中的轨迹并利用星像点能量分布模型估计恒星的成像区域和加权中心，采用迭代的方法使得两加权中心重合，从而得到曝光结束时刻星像点质心的精确值。仿真分析了算法的质心提取精度及相关因素对提取精度的影响，结果表明算法在振动环境下仍可准确提取出星像点的质心，精度在百分之一像素左右，而且算法具有较好的适用性。
침대진동배경중성민감기폭광득도적모호성상점질심제취정도저적문제，제출료관성신식보조적성상점질심제취모형병건립료상응적산법。산법이성상점구역적가권중심위폭광초시시각적성상점질심，근거여성민감기첩련적관성설비측득적진동신식계산질심재폭광과정중적궤적병이용성상점능량분포모형고계항성적성상구역화가권중심，채용질대적방법사득량가권중심중합，종이득도폭광결속시각성상점질심적정학치。방진분석료산법적질심제취정도급상관인소대제취정도적영향，결과표명산법재진동배경하잉가준학제취출성상점적질심，정도재백분지일상소좌우，이차산법구유교호적괄용성。
As for the low centroid precision of blurry star spots acquired by the star sensor in vibration environment,the star spot centroiding model with inertial measurement information was proposed and the centroiding algorithm was formed.The weighted center of the star spot was regarded as the centroid at the initial time of the exposure by the algorithm,then the centroid track could be computed with the vibration information by the strap-down inertial sensor,and the star imaging area and its weighted center could be estimated with the star spot power distribution model. Finally,the exact centroid value at the finish time of the exposure was got by using iterative operation to make the two weighted centers coincide with each other.The centroiding precision of the algorithm and the effect of relevant factors on it are analyzed by using simulation data,and numerical results indicate that the method can reach about 0.01-pixel centroid precision even in the vibration environment with a good applicability performance.