近地面用全天时星敏感器用于大型飞机、临界空间飞行器等航空器的导航。近年来，随着星惯组合导航技术的快速发展，国外开始重视该项技术的研究。主要研究近地面用全天时星敏感器中基于 EMCCD的星相机的设计与应用。分析了星相机的全天时探测的原理，提出采用高灵敏度 EMCCD成像技术解决白天强背景下的探测问题。在原理研究的基础上，完成了基于 CCD201探测器的星相机及实时图像处理器的硬件设计和调试，采用硬件实时中值滤波的方法实现全天时星图的预处理。设计的星相机系统信噪比可达 50 dB左右。通过进行白天观星实验获得恒星图像，并成功进行了目标提取。实验说明所设计的 EMCCD相机具备白天恒星探测能力。

Full-time Star Sensor in aerosphere can be used for navigation of large aircraft, near space aircraft ,and so on. The technology is researched along with the rapid development of celestial navigation recently. The paper studies the design and application of EMCCD camera for full-time star sensor. This paper analyzes the principle of full-time detection of the star sensor, and uses highly sensitive EMCCD imaging technology to solve stars detection problem in daytime. The paper discusses the design scheme of imaging system based on CCD201 and real-time image processor. The star camera's performance is verified by experimental methods. By analyzing the experimental images we can find that EMCCD image’s SNR reaches 50dB and the stars are detected in daytime.