白天空间目标激光测距微弱信号探测方法

白天空间目标激光测距数据有助于提高空间目标定轨精度，在航天科研方面具有重要应用价值。白天天空背景较亮，激光测距回波信号一般很弱，从较强背景光中识别出微弱的空间目标激光回波信号十分困难。针对白天空间目标激光测距微弱信号探测技术难题，从白天天空背景噪声影响估算入手，计算了不同探测阈值情况下的测距虚警率，分析了白天激光测距距离门宽与探测阈值的关系，给出了白天对空间目标激光测距的回波信号探测阈值，提出了基于多光子探测器的白天激光测距微弱信号探测方法，并对其可行性进行了实验验证，该研究成果可应用于白天空间目标激光测距系统设计及新型激光测距系统发展研究等方面。

Weak signal detecting method of laser ranging for space target in daytime

Daytime space target laser ranging data can help improve the space target orbit determination precision, has important application value in terms of space research. During the daytime, the sky background is light, laser ranging echo signal is very weak, generally to identify the weak space target laser echo signal from the strong background light is very difficult. In allusion to weak signal detecting technical problem of laser ranging for space target in the daytime, influence of sky background noise in the daytime was estimated, ranging false alarm probabilities at various detection threshold was calculated, relation of detection threshold and laser ranging gate was analyzed, detection threshold requirement of laser ranging for space target in the daytime was presented, a weak signal detecting method of laser ranging for space target in the daytime based on multi-photon detector was put forward, and its feasibility was validated by experiment. This result can be used for designing daytime laser ranging system and researching new type laser ranging system.