Laser ranging auxiliary optical image combined adjustment method and system

Abstract

The invention provides a laser ranging auxiliary optical image combined adjustment method and system. According to the method and the system, homonymy matching points of all images serve as a first type of image point observation values, a back projection point of a laser footprint point on a certain image and matching points of the back projection point on other images serve as a second type of image point observation values, the obtained back projection points of the laser footprint point on all images serves a third type of image point observation values, mean square roots of the distance from cumulative points to a nuclear line serve as direct observation values, and a corresponding error equation is listed; the laser footprint points are regarded as low-precision control points, and acorresponding coordinate observation equation is listed; a GPS or POS error observation equation is combined to form a laser ranging auxiliary optical image combined adjustment model, and precise outer orientation elements of the images are solved by using a least squares adjustment criterion. The requirements of high-precision earth observation positioning under a condition of no direct ground control can be fully met.

Description

technical field [0001] The invention belongs to the field of surveying and mapping science and technology, and relates to a combined optical image adjustment technology aided by laser ranging. Background technique [0002] With the development of sensor technology, integrating multiple sensors on some UAV platforms to give full play to the data acquisition capabilities of each sensor has increasingly become a research hotspot in the field of traditional surveying, mapping and remote sensing, and how to carry out joint processing of multi-sensor data is one of them. one of the key technologies. On the current reconnaissance platforms, part of the equipment is integrated with inertial integrated navigation devices, such as GPS / IMU, Beidou system, high-frequency optical cameras and laser measurement devices, which makes these platforms not only have conventional reconnaissance attributes, but also make them an attack weapon. At present, these platforms often use laser ranging...

AI Technical Summary

Problems solved by technology

At present, these platforms often use laser ranging for target positioning, which requires the laser to lock the target during target ranging, which is not conducive to emergency treatment in the case of multiple targets

In the field of traditional photogrammetry, the image taken by the optical camera is used for block adjustment to obtain the accurate internal and external orientation elements of the image, and then the front intersection method is used to obtain the ground position of the target. The advantage is that the accuracy of target positioning is better than that of laser positioning. method, the disadvantage is that the technical process is complex, and the processing time cannot meet the quasi-real-time requirements

In addition, due to the temporary nature of the mission of the reconnaissance platform, it is impossible to accurately predict the ground control situation in the target area in advance, so only the uncontrolled adjustment technology in the field of photogrammetry can be used, and the accuracy of this technology often depends on the accuracy of the platform observation equipment itself

Moreover, in the process of beam adjustment, a large number of object space points as unknowns increases the processing burden on the platform machine, which is not conducive to the popularization and application of this technology

Images