基于星敏感器的白天测星可探测到的星数目有限，严重限制了导航需求。利用红外波段可以探测到足够多的用以 导航的星体。采用近红外多视场小口径探测器同时对不同天区进行恒星探测。各个探测器接收到的背景辐射不同，探测到的恒星视星等也不同。 利用MODTRAN软件对白天不同探测器方位角时的背景辐射进行了分析。根据不同方位角时的辐射曲线，提出了背景修正方法——倒影法并以6星 等恒星对其进行了验证。

Since the stars which can be detected by a star sensor in the daytime is limited, the demand of star navigation is limited severely. By using an infrared waveband, enough stars can be detected for navigation. Several near infrared multiple field-of-view detectors with a small diameter are used to detect the stars in different sky areas. Because the background radiation received by each detector is different, the detected stellar apparent magnitude is different. The MODTRAN software is used to analyze the background radiation detected by the detectors at different azimuths in the daytime. According to the radiation curves obtained at different azimuths, a background correction method, the reflection method is proposed and is verified by using six stars.