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.