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

Wang, Yunwen; Wang, Z. Y.; Zhou, Wangming; Han, Xinqin

doi:10.2478/s11772-011-0005-7

Cited by 2 publications

(1 citation statement)

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“…Specific definitions of coordinate system involved in the stable strategy are as follows: 1 Vector coordinate system (b): the origin is the geometric center of POS (point O). X-axis is the direction of platform's lateral axis and pointing right, Y-axis is the direction of platform's longitudinal axis, perpendicular to the X-axis and pointing front; the Z-axis is perpendicular to the plane O-XbYb and meets the right hand (RH) rule (Wang et al, 2011). 2 Pod coordinate system (c): the origin is the intersection of LOS and pod's azimuth motor axis.…”

Section: Stable Strategy For Optoelectronic Imaging Platformmentioning

confidence: 99%

Strap‐down stabilization for multi‐load optoelectronic imaging platform

Wang

Zhou

Han

et al. 2012

Aircraft Engineering and Aerospace Technology

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Purpose -The purpose of this paper is to describe a strap-down image stable strategy for multi-load optoelectronic imaging platform hung below a tethered aerostat. Design/methodology/approach -Four two dimension pods, each with a visible light camera, are fixed on the optoelectronic platform. A POS (Position and Orientation System) is used to acquire the attitude rate data of optoelectronic platform, while the data can be coupled to the pods' servo systems through corresponding coordinate rotation, then the motors of pods will adjust the line of sight to the opposite way to keep the stabilization of image exported by visible light camcorders. Simultaneously, two rate gyros are installed at the inner frame of each pod, which are used as a backup to avoid the failure of POS. Findings -Using one attitude and position measurement system can realize the stabilization of multi optoelectronic pods, which is same as or even better than the ratio gyro stabilization. Research limitations/implications -As the tethered aerostat is a flexible body, it is affected a lot by the wind speed and wind direction at the low height (,1,000 m), which leads to the motors of pods always adjust the line of sight to the mechanical limiting of pods. Practical implications -Strap-down stabilization technology has been successfully used in the tethered aerostat monitoring platform to surveillance Shanghai World EXPO site. Long time experiments verify the feasible and effective of the multi-load stabilization technology. The impact on the image by the adjustment of servos is less than 10 percent of the whole view of sight. Originality/value -The paper introduces a strap-down stabilization technology for multi-load tethered aerostat platform, which is more suitable to be applied in the platform of relatively minor attitude change, like the airborne multi-load platform and multi-load UAV (unmanned aerial vehicle) platform.

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Section: Stable Strategy For Optoelectronic Imaging Platformmentioning

confidence: 99%