地基光度测量方式对比

Comparison of ground-based photometric measurement ways

介绍了地基测量空间目标光度的两种方式。首先介绍了系统组成及对比测量原理,然后基于工程角度分析提出了宽谱段测量和滤光片测量两种方式,并给出了两种测量方式的误差分析。若G型恒星及空间目标在同一视场可选择宽谱段测量方式,若途经天区G型定标星较少,可以选择滤光片测量方式。外场实验验证表明,宽谱段测量方式信噪比较高,可探测的极限星等为16等星,在天气条件较好的情况下测量精度在0.15星等左右,而滤光片测量方式由于探测到的能量较少,在相同信噪比下可探测极限星等为14等星,天气变化较小条件下测量精度在0.02星等左右,两种测量方式误差相当,但宽谱段测量方式定标恒星数量增加2.4倍,便于数据处理与计算。

In order to realize photometric measurement, two types of measurement way are established.First, the system composition and the contrast measurement principle are introduced, and then wide spectrum meas-urement way and filter measurement way based on the analysis of engineering are proposed.If G-type stars and space target in the same field of view, the wide spectrum measurement way can be chosen;if G-type reference stars is less, filter measurement way can be chosen;measuring error analysis for these two ways is given.Fi-nally experimental results indicate that the wide spectrum measurement way has high signal noise ratio（ SNR）;the limiting magnitude is 16 mv , and the measurement precision can reach 0.15 magnitude under better weath-er condition;under the same SNR condition, due to the less energy detected by filter measurement way, limit magnitude is 14 mv; under the condition of small weather changes, measurement precision can reach 0.02 magnitude.Two types of measurement errors are almost the same, but the number of stars calibrated by the wide spectrum measurement way increases by 2.4 times, which is advantageous for the data processing and calculation.