天文导航可全面地提供位置、航向、姿态和速度等核心导航信息,特别是在复杂电磁环境下,发挥着独特的重要作用。测星能力是天文导航设备的核心指标之一,提出了光电通道测星的信噪比和调制度的计算公式和参数选取说明,给出了短波红外测星设备的计算实例和实测结果,结果表明短波红外测星可显著延长测星时段。 Astronomy navigation can provide core navigation information such as position, heading, attitude and speed comprehensively, especially playing a unique and important role in complex electromagnetic environment. As one of the core indicators of the astronomical navigation equipment, the capability of star-measuring is proposed. The calculation formulas and parameter selection of signal-to-noise ratio and modulation degree are proposed. The calculation examples and the measured results of the short-wave infrared satellite measuring equipment are given. Show that shortwave infrared satellite can significantly extend the time to measure stars.