Scene matching/visual odometry-based inertial integrated navigation method

Abstract

The invention relates to a scene matching / visual odometry-based inertial integrated navigation method. The method comprises the following steps: calculating the homography matrix of an unmanned plane aerial photography real time image sequence according to a visual odometry principle, and carrying out recursive calculation by accumulating a relative displacement between two continuous frames of real time graph to obtain the present position of the unmanned plane; introducing an FREAK characteristic-based scene matching algorithm because of the accumulative error generation caused by the increase of the visual odometry navigation with the time in order to carry out aided correction, and carrying out high precision positioning in an adaption zone to effectively compensate the accumulative error generated by the long-time work of the visual odometry navigation, wherein the scene matching has the advantages of high positioning precision, strong automaticity, anti-electromagnetic interference and the like; and establishing the error model of the inertial navigation system and a visual data measuring model, carrying out Kalman filtering to obtain an optimal estimation result, and correcting the inertial navigation system. The method effectively improves the navigation precision, and is helpful for improving the autonomous flight capability of the unmanned plane.

Description

technical field [0001] The invention belongs to the technical field of unmanned aerial vehicle navigation and positioning, and relates to an inertial integrated navigation method based on scene matching / visual mileage. Background technique [0002] High-precision, high-dynamic and high-reliability autonomous navigation is one of the key technologies to ensure that UAVs can successfully complete various tasks. It is of great significance to enhance the autonomous behavior of UAVs and improve combat effectiveness. Navigation methods are divided into satellite navigation, radio navigation, inertial navigation, etc. Among them, inertial navigation (INS) occupies a special position in navigation technology due to its outstanding advantages of high autonomy. The existing UAV navigation systems are all based on inertial navigation. The core constitutes an integrated navigation system to complete the autonomous navigation of UAVs in complex environments. [0003] At present, the mo...

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Problems solved by technology

[0003] At present, the most important way of UAV navigation is the INS / GPS integrated navigation system, but in the unknown and dynamically changing complex environment, the GPS signal power is weak, vulnerable to electromagnetic interference, and even stops working in the signal blind area, resulting in combination The navigation system has a huge error, resulting in unpredictable consequences, and my country's Beidou satellite navigation system is in a stage of continuous development, and its reliability and accuracy are still difficult to meet the high-precision navigation requirements such as military applications

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