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2 2011

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Tracking technology for optoelectronic imaging platform of tethered balloon based on DGPS/INS

Wang Y. W., Wang Z. Y., Zhou W. H., Han X. Q.

Opto-Electronics Review

2011

Vol. 19, No. 2

242-248

In this paper, a tracking method for optoelectronic imaging platform of tethered balloon based on difference global positioning system/inertial navigation system is presented in detail. The location and attitude information of optoelectronic imaging platform, the azimuth and elevation angles of camera’s line of sight are used by this method to locate the ground target at the centre point of the camera's field of view through corresponding coordinate transformation. And then, the method makes use of the update position and attitude information to solve the theoretical point of camera's line of sight inversely. Finally, an angle control commend will be sent to the inertially-stabilized turntable on the optoelectronic imaging platform, which will adjust its azimuth and elevation angle to make the camera's line of sight to the ground target. A lot of experiments are conducted, and the results show that the initial ground target is always in the centre of camera's field of view no matter how the balloon's position and attitude change, and the new location data of ground target has little difference with the initial location data, while the difference between them is close to 0.

Light scattering models of white blood cells and back-scattering distribution analysis of them

Wang Y. W., Bu M., Shang X. F., Yue Q. W.

Optica Applicata

2011

Vol. 41, nr 3

527--539

Focusing on the light scattering technique and its application in cell identification, the analysis of the morphological structures of the WBCs (white blood cells) has been made, and the light scattering models of five types of the WBCs have been built. Based on the light scattering theory and applying numerical simulation techniques to a systematic study of the back-scattering intensity distribution of five types of the WBCs, some significant effects made by the internal and external morphological structures of the WBCs and the changes of their refractive index to their back-scattering distribution and certain relations between them have been found. Thus, the back-scattering theory and its application have been expanded, and it is very useful to improve the technique of cell identification.