Abstract:The current status of the optical micro-satellites at home and abroad is presented in brief. The main parameters of the optical micro-satellites at home and abroad over the past two decades are summarized and analyzed. It is found that the modern optical micro-satellites are commonly in sun-synchronous orbits. Their mass, size and power consumption decrease year by year. The data show that the optical micro-nano satellites have entered a rapid development stage and will occupy the dominant position in optical micro-satellites soon. However, in view of the factors such as cost, power consumption and key performance, the optical micro-satellites will eventually have a proper size other than the smaller the better. Modern optical micro-satellites are flexible in spectral band setting. Strong comprehensive detection capability, multi-use and multi-capability will become the common features for future optical micro-satellites. In addition, compared with CCD, CMOS is superior in cost. The development of new CMOS has achieved significant progress. It is expected that CMOS devices will be more used in optical micro-satellites.

Abstract:The current research status of electro-optical detection equipment at home and abroad is presented. Then, the development tendency of foreign electro-optical equipment is analyzed. The difference between the military electro-optical equipment of our country and that of foreign countries is summarized. Finally, the development focus of military electro-optical equipment of our country in the future is proposed.

Abstract:With the increasing of the imaging resolution of remote sensing satellites in the future, their coverage range will become wider and wider and their observation data will increase greatly. The existing manual monitoring is far from meeting the demand. Therefore, `intelligent'' monitoring becomes more and more urgent. At present, the space-based independent video surveillance technology is a hot spot in the field of computer vision, which involves in image processing, pattern recognition and artificial intelligence. This research is rich in content and has a wide application range. The key independent recognition technologies of abnormal moving targets are summarized from three aspects. The key algorithms are presented. The advantages and disadvantages of some typical algorithms are analyzed. The technical route with excellent robustness, high real-time performance and good detection effectiveness is given.

Abstract:Taking Shanghai coast zone as the study area and using the 1985-2015 landsat images as the data source, a new method for coastline extraction is proposed. By incorporating the processes such as object-oriented image segmentation, threshold selecting, edge detection and tide correction, the coastline within the study area over seven years is extracted frame by frame. The change rule of the coastline in Shanghai in recent thirty years is analyzed. The result shows that the change of the coastline in Shanghai is affected by both natural and human factors. The total change of the coastline in Shanghai appears as coastline outward extension and siltation. The total length of the coastline exhibits the trend of rising. The coastline increases from 176.54 km in 1985 to 189.77 km in 2015. The length of the new added coastline is 13.23 km. This research result reveals the developing process of Shanghai coast zone. It lays a basis for the further extraction and analysis of the change rule of land use in Shanghai coast zone.

Abstract:A visible and near infrared imaging spectrometer is one of the important parts for spectral detection. According to the actual application requirements of a ground-based visible and near infrared imaging spectrometer, a staring/scanning imaging spectrometer using an area array detector is proposed. The spectrometer also employs a new light splitting device-an Accousto-optical Tunable Filter (AOTF). It has a feature that the selection of spectrum is related to the frequency of the RF signal applied to it. By controlling the RF signal via a program, the spectrum can be controlled. A ground-based lunar observation experiment is carried out with the imaging spectrometer prototype designed. According to the experimental characteristics, another auxiliary coaxial optics is added for rough positioning on the basis of optical design. After the imaging results are acquired, radiometric calibration and SIFT image stitching are implemented. The results show that by combining a two-dimensional pointing mechanism and a staring imaging system with the SIFT image stitching algorithm, wide width high resolution spectral images can be acquired effectively.

Abstract:An in-line pulse tube cryocooler regenerator is designed. An experimental platform for in-line low temperature oscillatory flow pressure drop is established for the regenerator. Experimental study is carried out for the pressure drop and the change rule of pressure ratio at the cold end. The influences of input power, frequency, cooling temperature and initial pressure on the pressure drop of the regenerator are analyzed. The results show that the lower the operating frequency of the crycooler is, the lower the cooling temperature is and the greater the pressure drop of the regenerator is. The pressure drop under the initial pressure of 3.0 MPa is greater than that under the initial pressure of 3.2 MPa. The higher the pressure ratio at the cold end is, the higher the relative Carnot efficiency is. By increasing the pressure ratio at the cold end of the regenerator, the efficiency of the pulse cryocooler can be improved.

Abstract:In the light of the payload cooling requirements of space-based infrared staring and scanning observation systems, pump driving circuits having advantages of strong fluid and heat transferring, high-lift and high adjustability can be used as the cooling circuits for long distance large area array distribution payloads. It is very important to control the gas void fraction in a single phase liquid circuit. A gas-liquid separation device based on the flow mechanism of two phase fluid in a porous zone is designed. Its design ideas and test verification are presented. Optimized parameters are obtained through numerical calculation and simulation. Flow parameters are measured. The gas-liquid separation effectiveness of this device is verified.