Prof. Dail Lu Profile

Prof. Dail Lu

at CIOMP

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Proceedings Article | 10 November 2010 Paper

Earth elevation map production and high resolution sensing camera imaging analysis

Xiubin Yang, Guang Jin, Li Jiang, Lu Dai, Kai Xu

Proceedings Volume 7850, 785013 (2010) https://doi.org/10.1117/12.867766

KEYWORDS: Cameras, Error analysis, CCD cameras, Imaging systems, Motion models, Device simulation, Charge-coupled devices, Modulation transfer functions, Space operations, Image compression

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The Earth's digital elevation which impacts space camera imaging has prepared and imaging has analysed. Based on matching error that TDI CCD integral series request of the speed of image motion, statistical experimental methods-Monte Carlo method is used to calculate the distribution histogram of Earth's elevation in image motion compensated model which includes satellite attitude changes, orbital angular rate changes, latitude, longitude and the orbital inclination changes. And then, elevation information of the earth's surface from SRTM is read. Earth elevation map which produced for aerospace electronic cameras is compressed and spliced. It can get elevation data from flash according to the shooting point of latitude and longitude. If elevation data between two data, the ways of searching data uses linear interpolation. Linear interpolation can better meet the rugged mountains and hills changing requests. At last, the deviant framework and camera controller are used to test the character of deviant angle errors, TDI CCD camera simulation system with the material point corresponding to imaging point model is used to analyze the imaging's MTF and mutual correlation similarity measure, simulation system use adding cumulation which TDI CCD imaging exceeded the corresponding pixel horizontal and vertical offset to simulate camera imaging when stability of satellite attitude changes. This process is practicality. It can effectively control the camera memory space, and meet a very good precision TDI CCD camera in the request matches the speed of image motion and imaging.

Proceedings Article | 26 November 2007 Paper

Application of CMOS APS star tracker with large FOV in attitude and angular velocity determination

Dai Lu, Jin Guang, Wang Shaoju, Chen Tao

Proceedings Volume 6830, 683026 (2007) https://doi.org/10.1117/12.758702

KEYWORDS: Stars, Charge-coupled devices, Detection and tracking algorithms, Space operations, Mathematical modeling, Sensors, Satellites, Gyroscopes, Error analysis, Image sensors

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The paper deals with the spacecraft attitude determination problem using a new kind of star tracker with large FOV based on CMOS APS. Star tracker has been developed since 1970s and proved to be the most accurate sensor ever used in the spacecraft attitude determination systems. But the traditional CCD star tracker also has some disadvantages, such as small FOV, high power consumption, low sample rate and low working angular rate limit which prevent the use of CCD star tracker in attitude large angle maneuvering process. The new kind of star tracker based on CMOS APS has no such disadvantages and is more applicable on modern low-cost agile small satellites. Its higher sample rate and working angular rate limit over traditional CCD star tracker make it more adapt for spacecraft angular velocity determination. Because of the large FOV of the star tracker, the mathematical model of traditional CCD star tracker with a small FOV is not appropriate. So a new mathematical model was quoted to fit the star tracker with a large FOV. An alternative adaptive algorithm was also introduced in the paper. It can help the EKF algorithm work lacking of accurate covariance of the observation noise. An optimal estimation algorithm was used to estimate the angular velocity directly from the star tracker measurements. Mathematic simulation results indicate the CMOS APS star tracker can give accurate attitude information and estimated angular rate. The method can be used as the chief attitude determination system design of low-cost satellite without gyros, or be used as a backup strategy in the event of gyro failures to enhance the reliability of the attitude determination system.

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