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Method for indirectly positioning and identifying three-dimensional buildings by using riverway landmarks

A positioning recognition and building technology, applied in character and pattern recognition, integrated navigators, instruments, etc., can solve the problems of repeated patterns, poor contrast, and insignificant optical imaging features

Active Publication Date: 2012-05-09
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0008] The invention provides a method for indirect positioning and identification of three-dimensional buildings on the ground by using river course landmarks, the purpose of which is to solve the problem that under the condition of a moving platform, when the optical imaging features of the building to be identified are not obvious, such as being hidden, blocked, and repeated building patterns In various situations such as poor local contrast of buildings in optical imaging, the positioning and recognition of three-dimensional buildings in urban areas provides support for the capture and positioning of three-dimensional buildings on the ground during forward-looking navigation of aircraft

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  • Method for indirectly positioning and identifying three-dimensional buildings by using riverway landmarks
  • Method for indirectly positioning and identifying three-dimensional buildings by using riverway landmarks
  • Method for indirectly positioning and identifying three-dimensional buildings by using riverway landmarks

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Embodiment Construction

[0042] At a sufficient flying height and an appropriate flying angle, the visibility of the river course landmarks can be guaranteed. Therefore, the present invention is considered under the condition that the river course landmarks are visible.

[0043] Below to Figure 12 The present invention will be further described in detail by taking a satellite remote sensing map including a certain three-dimensional building, a river course, and land as an example. The overall flow chart is as figure 1 shown.

[0044] 1. Ground preparation

[0045] (1.1) According to the pre-planned track entry direction, select the candidate set of river landmarks visible on the route. For the sake of reliability, usually select the river landmarks in the vicinity of the building to be identified. Figure 12 and Figure 13 It is a satellite remote sensing map of the area of ​​2000 meters × 2000 meters near the landmarks of the river, in Figure 12 The direction of flight when acquiring the forwa...

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Abstract

The invention discloses a method for indirectly positioning and identifying three-dimensional buildings on the ground by using riverway landmarks, which comprises the following concrete steps: firstly, capturing riverway landmarks, and resolving the position of a three-dimensional building object in the real-time diagram; then, using the position of the three-dimensional building object as a center, and selecting a local region of interest (ROI) in the real-time diagram; and finally, directly identifying and positioning the building object in the local ROI. The method provided by the invention can be used for indirectly identifying and positioning buildings in the urban complicated background under the movable platform condition, achieve good robustness and positioning accuracy, and meet the application requirements of unpiloted or piloted aircrafts in urban areas in the fields of automatic accurate navigation, prevention of collision of the aircrafts, and the like.

Description

technical field [0001] The invention belongs to the technical field of intersecting imaging automatic target recognition and navigation guidance, and specifically relates to an indirect positioning and recognition method for ground three-dimensional buildings based on river course landmarks under the condition of a moving platform, which is used for capturing and positioning ground three-dimensional buildings during forward-looking navigation of aircraft . Background technique [0002] Ground three-dimensional buildings are an important part of artificial buildings. Accurate positioning and identification of them can meet the application requirements of autonomous and precise navigation of unmanned aerial vehicles and manned aerial vehicles in urban areas, and aircraft collision avoidance. Ground three-dimensional buildings are usually located in complex natural scenes, especially in urban areas, in most cases they are associated with surrounding buildings and are located in...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00G01C21/24
Inventor 张天序王登位万美君杨效余汪小平敖国庆李成毛麟孙思远郑璐璐王曼
Owner HUAZHONG UNIV OF SCI & TECH
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