Abstract:To verify the feasibility of detecting small targets in sea clutter with infrared polarization imaging, experiments are carried out on infrared polarization imaging against the sea background. Both an infrared thermal imager with a polarizer and one without a polarizer are used to detect the dim target against the sea clutter background. At the same time, the data under the corresponding condition are collected. To verify the effectiveness of the polarizer in the inhibition of sea clutter, imaging processing is performed for the collected data. The target is not extracted from the data collected by the infrared thermal imager without a polarizer. However, the target is extracted from the data collected by the thermal imager with a polarizer through image enhancement, median filtering and edge detection.

Abstract:To solve the problem that the passive millimeter wave technology has not enough capability to detect high-speed moving targets, a passive millimeter wave detection system is built by using a direct detection millimeter wave radiometer based on a Monolithic Microwave Integrated Circuit (MMIC). The data of a high-speed moving target are measured under different conditions in experiment. On the basis of the analysis of the characteristics of the test signals, it is pointed out that the peak of the first pulse and the spacing between two pulse peaks can reflect the effective motion characteristics of the target. A method for calculating the motion speed of the target is proposed. The results show that the method has a certain precision and can be used in the passive millimeter wave detection system to determine the parameters of the moving target.

Abstract:As a key part of a space camera, the camera body structure is very important to the normal operation of the camera. According to the requirements in the aspects of optical design and satellite, the body structure of a space camera is designed. The body structure is made of silicon-aluminum alloy and its configuration is completed by welding. Through finite element analysis, the static and dynamic mechanical properties of the camera body are calculated and the reasonability of the body structure is verified. The welding stress is calculated and the calculation result shows that the welding stress can not affect the stability of the body structure. Finally, the mechanical and thermal experiments are made on the body structure. Its mechanical properties and stability are verified. The results show that the body structure of the high-resolution space optical camera can be made of silicon-aluminum alloy by welding.

Abstract:To make full use of the advantages of the data measured both by a radar and by an infrared sensor, a fusion method for radar and infrared data is proposed. On the basis of least square theory, the radar data and the redundant information of an infrared sensor when it measures at a high frequency before and after the radar measures are used. The optimal estimation of a target is obtained by incorporating two weighting factors: time dimension and measurement dimension. The simulation test result shows that compared with the equality weighting factor fusion method, the fusion data information obtained by the proposed method can reflect the motion state of a target better and can provide more accurate observation value for the subsequent target tracking.

Abstract:A new pseudo-color transform method for infrared images is proposed. In the processing of infrared gray images, the method can not only enhance the details of a target, but also can improve the contrast of the target to its background. The experimental result shows that the method can make the distinction between the target and its background be more apparent and make the target edge be more distinct. This is favorable for the analysis and interpretation of moving targets against complicated sea-sky background.

Abstract:By analyzing the influence of various infrared detection factors on infrared image taking experimentally, a temperature compensation method is used to correct infrared images on the basis of the position control chart of infrared image collecting points. Then, the collected infrared images are segmented according to the actual operation characteristics of diesel engines. Finally, an area comparison method is used to discriminate and diagnose the faults in the diesel engine on the basis of the segmented infrared images. The experimental result shows that by adjusting the proportion and parameters of infrared images, the requirement of diagnosing most heating faults in diesel engines can be satisfied.

Abstract:In image processing, the detection of multiple infrared ship targets against the background of sea/sky and island is always difficult. The monitoring of multiple ship targets usually uses a wider field of view and a greater field depth. Although this can cover more target information and more imaging pixels against the sea/sky background, the extraction of saliency of multiple ship targets becomes more difficult. At the same time, the increase of field depth makes the ship targets much smaller and their outlines are no longer clear. This may cause great difficulty for the saliency detection of ship targets. By applying the theory of image level diversity and superpixel to the saliency detection of multiple ship targets at sea, a new saliency detection method for multiple ship targets at sea is proposed.