GPS//INS data direct directing precision assessment method

A precision evaluation and direct technology, applied in the direction of measuring devices, instruments, road network navigators, etc., can solve the problems of inability to correctly evaluate the quality of GPS/INS data, difficult three-dimensional mapping, labor-intensive and time-consuming, etc.

A precision evaluation and direct technology, applied in the direction of measuring devices, instruments, road network navigators, etc., can solve the problems of inability to correctly evaluate the quality of GPS/INS data, difficult three-dimensional mapping, labor-intensive and time-consuming, etc.

CN101509784AInactive Publication Date: 2009-08-19XIAN MEIHANG INFORMATION IND
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  • GPS//INS data direct directing precision assessment method
  • GPS//INS data direct directing precision assessment method
  • GPS//INS data direct directing precision assessment method

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Experimental program
Comparison scheme
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Embodiment Construction

[0046] Such as figure 1 As shown, the GPS / INS data direct orientation accuracy evaluation method of the present invention comprises the following steps:

[0047] Step 1. Take a plurality of photographic photos of the area to be measured by aerial photography according to the aerial photography specifications, and obtain the image point coordinate observation data of the ground control points in each photo by the photo measurement method, and simultaneously pass the GPS / INS system Obtain the outer azimuth element when each photo is taken, the outer azimuth element includes the outer azimuth element , ω and κ and the coordinates of the photography center point (X S , Y S ,Z S ); and obtain the inner orientation element x of each photo by conventional photogrammetry method 0 、y 0 and f; the number of the multiple photographic pictures is the number of pictures of each control point on the ground imaged on multiple pictures, which is set to N.

[0048] The conventional on-t...

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Abstract

The invention discloses a GPS / INS data direct orientation precision evaluation method, which takes photogrammetric emphasis equation collinearity equation as base and a multi-piece forward intersection of a bundle method as theory basis; the evaluation method is combined with the least square principle for obtaning the coordinate of a ground control point object by compensating calculation; and then a comparison with the actually measured coordinate of the ground control point is carried out for obtaining the error value of the coordinate by the statistics so as to evaluate the direct orientation precision of the outer orientation elements obtained by the GPS / INS system. The method has high evaluation precision and small measurement error, and the evaluation result can be used for manufacture practice directly, thus being capable of effectively avoiding the measurement error of the picpointed coordinate added in manual stereomeasurement; and the algorithm is not limited by image number.

Description

technical field [0001] The invention relates to the technical field of photogrammetry, in particular to a GPS / INS data direct orientation accuracy evaluation method. Background technique [0002] Obtaining the outer orientation elements of images is one of the key issues in photogrammetry. Many photogrammetry workers have been working hard to solve the problem of how to quickly and efficiently acquire the outer orientation elements of images. For a long time, people have mainly used aerial triangulation technology to indirectly solve the external orientation elements through a large number of field control points. The above method not only wastes money, but also prolongs the mapping cycle, which seriously affects the urgently needed data for national economic construction. Since the 1990s, the international photogrammetry community has begun to study the use of GPS / INS integrated navigation system (that is, GPS / INS system: a combined system of GPS system and INS inertial nav...

Claims

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Application Information

Patent Timeline
19 Aug 2009
Publication
CN101509784A
IPC
G01C25/00; G01C21/28; G01C11/06
Inventors
吴晓燕; 苗小利