Method for directly positioning ground target by self-checking POS

Abstract

The invention discloses a method for directly positioning a ground target by self-checking POS. The method comprises the steps of: according to the ultimate principle of directly positioning ground target, deducing a theory relationship between an error in an image exterior orientation element and an error in a target point measurement, building a POS system error compensation module, guiding the module into a space intersection rigor formula based on a collinear condition, building a strict error compensation module for self-checking POS directly positioning ground target, and then solving a three-dimensional ground coordinate of an additional parameter and a point to be fixed according to the least squares error compensation principle so as to directly position ground target by self-checking POS having the additional parameter. The precision for directly positioning ground target by self-checking POS meets the demand of measuring the detail point of aerial survey topography mapping, avoids building a specific checking field to check required by using the POS system, decreases the technical difficulty of aerial photograph, saves the measuring cost of aerial photograph and provides a method for decreasing the vertical parallax for rebuilding a three-dimensional model.

Description

technical field [0001] The invention relates to the fields of photogrammetry and remote sensing, in particular to a self-checking and calibrating POS method for direct ground target positioning. Background technique [0002] The positioning and orientation system (POS) integrating dynamic GPS positioning technology (GPS) and inertial navigation technology (INS) is applied to aerial remote sensing to jointly process the GPS antenna phase center coordinates obtained by GPS and the sensor attitude angle data obtained by IMU , the six orientation parameters of the image can be obtained. Utilizing this set of image orientation parameters provided by POS to arrange element aerial survey topographic mapping will break the traditional operation mode of aerial photogrammetry "aerial photography-photo field control measurement-photogrammetry encryption-model orientation-topographic mapping", greatly simplifying process flow. With the use of new sensors such as aerial digital camera ...

AI Technical Summary

Problems solved by technology

However, the proving ground calibration method has its limitations: ① It is necessary to set up a special calibration ground, which increases the production cost; and other reasons, the aerial photography of the two places cannot be guaranteed to be completed in the same sortie

Therefore, the POS system error calibrated by the calibration field cannot truly reflect all the system errors of the POS image orientation parameters in the shooting area

Although the POS-assisted beam method block adjustment without a calibration field can self-check and effectively eliminate POS system errors, and solve the problem of using POS image orientation parameters to reconstruct a three-dimensional model to produce large upper and lower parallax problems, it must go through the photogrammetry encryption process. It is not possible to directly use the POS image orientation parameters for placement element mapping

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