Our country is at a developing stage in the area of high-frequency observation of oceans. As an important approach of observation of ocean, the development of the geostationary ocean radiometer is of great significance. In this paper, we analyze the image rotation errors introduced by the optical system of plane imaging with two-dimensional pointing reflection mirror, propose the image rotation elimination method for two-dimensional scanning and the verification method. It is proved that the proposed rotation elimination method can reduce 39% of image rotation. This indicates that the algorithm greatly improve the accuracy of two-dimensional directional imaging and improve the accuracy of remote sensing instruments. Therefore, the work lay a good foundation for image processing in two-dimensional pointing plane imaging system.

Elimination method of image rotation for geostationary radiometer and its verification method

The observation accuracy of space camera targ eted on ground objects is directly affected by th e pointing deviation of the two dimensional scan mirror. A plane model of the scan mirrors normal trajectory is established when scan mirror is rotating along the rolling axis while the pitching axis remain s still. The pointing accuracy of scan mirror cross the track direction is measured with the plane model. A cone model of the scan mirrors normal trajectory is established when scan mirror is rotating along the pitc hing axis while the rolling axis remains still. The pointing accuracy of scan mirror along the track direction is measured with the plan e model. The nonorthogonality of shafting of the rolling axis and the pitching axis is measured with the two models. Data processing results are feedback to pointing controller to correct the input signal of resolver, until the pointing accuracy of scan mirror meets the requirement. The experimental results indicate that the models of measuring the pointing accuracy of scan mirror are accurate and the data processing algorithm is feasible. The testing precision reached 10

The measurement of pointing accuracy of two-dimensional scan mirror

This article makes a deep research on the mathematical physical model and scanning model of the two-dimensional (2-D) pointing system of the Search and Tracking System in detail: analyses the characteristics of image rotation for a certain staring system with area FPA; studies the changes of scanning stepping angel on the condition that there is none omitted scan area in the different theaters of the field for searching and tracking.

http://ieeexplore.ieee.org/iel7/7389775/7398754/07398807.pdf

Analysis of search and tracking system for theater targets

In order to break through the bottlenecks for traditional optical mechanical scanning system (lower imaging frame frequency and difficult to control), this article analyzed the rapid scanning technology for imaging with high performance based on rotating of two-mirror. By using rotation of two-mirror instead of swinging back and forth for traditional scanning mode, we achieved scanning pattern with high linearity in the large field, while scanning fast, and 100% for scanning efficiency, the difficulty of system controlling is also reduced. This technology can effectively surmount the technical challenges of various optical imaging systems currently (especially for the terahertz detection system) in security screening field which requires high speed of scanning for imaging. Based on the theory of specular reflection and rotation for vectors, this article discussed and simulated several kinds of rapid scanning system for imaging by rotating of two-mirror in detail, such as Newton Telescope, Ritchey-Chretien or Gregory Telescope, dual 45 degree mirror system, fore based 45 degree mirror system，and so on. And then we obtained the quantitative relationship between the parameters of rotation for mirror controlling and the scanning trajectory in this paper. On this basis, this article compared and analyzed the performance for the series of two-mirror systems listed above which realized fast scanning for imaging, including the scanning range and scanning linearity. The results calculated in this paper can provide guidance for the selection of the structure and the optimization design of the scheme for the rapid scanning system for imaging

Research on rapid scanning technology for imaging with high performance based on rotating of two-mirror

Based on the theory of reflection and rotation for vector, this paper theoretically analyzes the scanning scheme by rotating the coaxial two-mirror, and constructs the transformation matrix for vector. On this basis, the relationship between the five control parameters for the scanning scheme by rotating coaxial two-mirror and the scanning trajectory (corresponding to different scanning strategies) is deeply analyzed. The scanning scheme by rotating the coaxial two-mirror designed and analyzed in this paper has the advantages of simple control (with uniform circular motion), high scanning efficiency (100%), and flexible scanning strategy and so on. It can realize the functions of rapid scanning for imaging, region ergodic searching, random or complex path for scanning and so on.

Design and analysis of rapid scanning scheme by rotating for coaxial two-mirror system

Based on the vector theory of optical reflection,nonlinear scanning traces characteristics of the two-dimensional pointing mirror in the scanning mode in the given area is analyzedThe expression of scanning trace and image rotation angle and the method of non-linear scanning trace modification are givenWithout eliminating the image rotation,this mode can be used in point object detecting system,such as IR detecting system

Analysis of Scanning Traces Characteristics of the Two-Axis Pointing Mirror in the Mode of Scanning in Given Area

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Analysis of Scanning Traces Characteristics of the Two-Axis Pointing Mirror in the Mode of Scanning in Given Area