Optical remote sensing is widely used in relief and military affairs. However, its detection ability is limited by the contrast between target and background. Polarization imaging detection is different from traditional intensity detection methods. It can effectively detect and identify polarization pattern obvious targets with low contrast, but it has some shortcomings such as large system volume, complex system design and low light efficiency. Therefore, a polarization detection method based on dynamic vision sensor (DVS) is proposed in the paper. The feasibility of the method is studied and analyzed here. A simple experimental system based on DVS and rotating polarizer is built. Moreover, both indoor and outdoor experiments are carried out separately. The results show that our method can effectively detect the targets with different degrees of polarization (Dop) in the scene, and has the advantages of high sensitivity, intuitive detection and small physical size. It holds the potential applications in the field of remote sensing based man-made targets detection.
In order to formulate accurate and reasonable random vibration test conditions for optical cameras and solve the problem of conservative design of test conditions caused by inaccurate simulation calculation, this paper proposes a general method for the design of random vibration specification for small satellites’ optical cameras. First, we derive the dynamic response formula, which lays a foundation for the small satellite dynamic simulation calculation. Then, the response of the optical camera mounting surface, which is obtained by the dynamic calculation of the small satellite finite element model, and the random vibration test conditions of the camera process is enveloped to obtain the preliminary random vibration test condition of the new research optical camera. Subsequently, we combine the random vibration test data of the optical remote sensing satellite, which has been used in orbit, and revise the preliminary random vibration test conditions of the new research camera in terms of response magnitude and frequency. Finally, we verify the rationality of this method through random vibration test of a small satellite. This scheme is conducive to the establishment of more reasonable and feasible random vibration test conditions for small satellites’ optical cameras, which is beneficial to the development and production of optical cameras.
Due to the military and commercial demands, space activities have become more frequent, and the exploration of the space around the world has been accelerating. The demand for high-speed data communications has prompted the development of satellite laser communication technology. Satellite laser communication has the advantages of large communication capacity, low transmitting power, long transmission distance, strong anti-electromagnetic interference capability and high security, which makes it gradually become an important direction for the development of space backbone network. Satellite laser communications terminals continue to become miniaturized volume, light weight and low power consumption, which makes it possible for small satellites applying laser communications technology. This paper introduces the development history and latest research progress of satellite laser communication in foreign countries, and the development status of domestic satellite laser communication, and summarizes some inspirations for the development of satellite laser communication technology.