Mr. Hongjian Wang Profile

Hongjian Wang

at Tsinghua Univ

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Author

Publications (2)

Proceedings Article | 21 August 2013 Paper

A high-precision earth sensor with three separated FOVs for aircraft application

Hongjian Wang, Fei Xing, Peirong Fan, Chong Wang, Zheng You

Proceedings Volume 8908, 89081V (2013) https://doi.org/10.1117/12.2034608

KEYWORDS: Sensors, Infrared sensors, Infrared radiation, Earth's atmosphere, Infrared detectors, Atmospheric sensing, Mathematical modeling, Space operations, Charge-coupled devices, Sun

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Proceedings Article | 21 August 2013 Paper

Optical flows method for lightweight agile remote sensor design and instrumentation

Chong Wang, Fei Xing, Hongjian Wang, Zheng You

Proceedings Volume 8908, 89081H (2013) https://doi.org/10.1117/12.2034008

KEYWORDS: Sensors, Optical flow, Remote sensing, Image sensors, Satellites, Remote sensing system design, Cameras, Modulation transfer functions, Satellite imaging, Charge-coupled devices

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Lightweight agile remote sensors have become one type of the most important payloads and were widely utilized in space reconnaissance and resource survey. These imaging sensors are designed to obtain the high spatial, temporary and spectral resolution imageries. Key techniques in instrumentation include flexible maneuvering, advanced imaging control algorithms and integrative measuring techniques, which are closely correlative or even acting as the bottle-necks for each other. Therefore, mutual restrictive problems must be solved and optimized. Optical flow is the critical model which to be fully represented in the information transferring as well as radiation energy flowing in dynamic imaging. For agile sensors, especially with wide-field-of view, imaging optical flows may distort and deviate seriously when they perform large angle attitude maneuvering imaging. The phenomena are mainly attributed to the geometrical characteristics of the three-dimensional earth surface as well as the coupled effects due to the complicated relative motion between the sensor and scene. Under this circumstance, velocity fields distribute nonlinearly, the imageries may badly be smeared or probably the geometrical structures are changed since the image velocity matching errors are not having been eliminated perfectly. In this paper, precise imaging optical flow model is established for agile remote sensors, for which optical flows evolving is factorized by two forms, which respectively due to translational movement and image shape changing. Moreover, base on that, agile remote sensors instrumentation was investigated. The main techniques which concern optical flow modeling include integrative design with lightweight star sensors along with micro inertial measurement units and corresponding data fusion, the assemblies of focal plane layout and control, imageries post processing for agile remote sensors etc. Some experiments show that the optical analyzing method is effective to eliminate the limitations for the performance indexes, and succeeded to be applied for integrative system design. Finally, a principle prototype of agile remote sensor designed by the method is discussed.

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