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Emergency communication and support system based on tethered unmanned aerial vehicle and method

The invention relates to an emergency communication and support system based on a tethered unmanned aerial vehicle and a method. The system comprises a flying platform subsystem, a ground control subsystem, a photoelectricity composite cable and a communication terminal. The flying platform subsystem comprises the unmanned aerial vehicle. A communications base station, a base station antenna and a video capturing device are arranged on the unmanned aerial vehicle. The ground control subsystem is connected with the flying platform subsystem through the photoelectricity composite cable, and controls and communicates with the flying platform subsystem through the photoelectricity composite cable. The photoelectricity composite cable transmits ground power to the flying platform subsystem, and realizes space data two-way optical fiber transmission. The communication terminal establishes communication connection with the ground control subsystem and the flying platform subsystem. The system and the method, which are provided by the invention, have the technical advantages of long air time, signal blind spot prevention and real-time air video capturing, and can be used for low-cost cluster communication and video support system solutions in the fields of public security, terrorism countering, high-rise building fire protection and the like.
Owner:CHINA NAT ELECTRONICS IMP & EXP CORP

Seamless visualization method for three-dimensional virtual reality system and geographic information system

The invention relates to a seamless visualization method for a three-dimensional virtual reality system and a geographic information system. The method comprises the steps that in a preprocessing stage, a three-dimensional model in the three-dimensional geographic information system is processed, and two-dimensional map symbols which are represented according to carpological standards are generated; in a real-time visualization stage of a three-dimensional geographic scene, in the process that a camera roams and observes the scene from near to far, a hierarchy selection technology is adopted to enable the three-dimensional model to conduct switching transition of multi-resolution level details from an exquisite layer to a rough layer until the roughest layer; with the distance between the camera and the three-dimensional model being further enlarged to a certain extent, the three-dimensional model is transited to a billboard through a Morph technology in a seamless mode and finally transited to the pre-generated two-dimensional map symbols in a seamless mode; the visualization process of the camera from far to near is opposite to the switching transition process from near to far. The seamless visualization method can achieve a seamless transition visual fusion effect, and meets the requirements of a user for multi-dimensional and polymorphous comprehensive perception and acknowledge of geographic information.
Owner:北京微视威信息科技有限公司
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