Calibration method for attitude measurement system of gnc subsystem equipment in large aircraft
A calibration method and measurement system technology, which is applied in the field of GNC sub-system equipment attitude measurement system calibration, can solve the problems of electronic theodolite mutual aiming cannot be carried out, scattered, difficult to aim at the cube mirror, etc.
Active Publication Date: 2020-11-27
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology
However, after the emergence of large-scale aircraft, the installed GNC subsystems are distributed over a large distance and scattered, and it is difficult for the electronic theodolite at a fixed site to aim at all the cube mirrors, and the mutual aiming of two electronic theodolites may also be blocked due to obstruction.
In addition, as the distance increases, the measurement error will inevitably increase.
Furthermore, as a necessary measurement step, cross-pointing itself will also introduce measurement errors
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[0013] In the measurement system calibrated by the GNC subsystem equipment attitude measurement system calibration method in the large aircraft of the present invention, as figure 1 As shown, there are 1 to 2 measuring stations, and in each measuring station, the autocollimator 1 and at least 3 standard tool spheres 2 are installed on the three-dimensional adjustment table 3, and each standard tool sphere 2 is placed randomly with each other And the positional relationship between each and the autocollimator 1 remains unchanged; the laser radar measuring instrument 4 is connected with the data processing server 5 . Next, the measurement system is calibrated according to the following steps, such as figure 1 , figure 2 Shown:
[0014] In the first step, the distance between the calibration plane mirror 6 and the autocollimator 1 is 2 to 3 meters, and the mirror surface of the calibration plane mirror 6 is perpendicular to the optical axis of the autocollimator 1 .
[0015] ...
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The invention discloses a calibration method of a GNC branch system equipment attitude measuring system in a large aircraft and belongs to the technical field of precision measurement and digital assembly. The calibration method of the GNC branch system equipment attitude measuring system in the large aircraft comprises the steps of enabling a reflection specularity of a calibration plane mirror to be vertical to an optical axis of an autocollimator; scanning the surfaces of standard tool spheres by a laser radar measuring instrument, using a beam of strongest reflection laser to be a measurement signal to obtain a detection distance, and at the same time, automatically compensating the radius values of the standard tool spheres to obtain the distances between the centers of the standard tool spheres and an original point of an overall coordinate system; reading a scanning angle value of the beam of the laser from an angle encoder, and combining the obtained distance value to calculatethe coordinates of the standard tool spheres in the overall coordinate system; using the same method to determine the coordinates, of all the standard tool spheres and images of all free calibrationplane mirrors of all the standard tool spheres, in the overall coordinate system; calculating the obtained coordinate values to obtain attitude relations between all the standard tool spheres and theoptical axis of the autocollimator, and accordingly establishing the relative attitude relations between the autocollimator and the laser radar measuring instrument.
Description
technical field [0001] The invention relates to a calibration method for an attitude measurement system of a GNC sub-system equipment in a large aircraft, and belongs to the technical field of precision measurement and digital assembly. Background technique [0002] Among the many control systems of the aircraft, the GNC subsystem is composed of various devices, such as gyroscopes, accelerometers, digital sun sensors, infrared earth sensors, analog sun sensors, etc. All motion control tasks from takeoff to return have very strict requirements on the relative installation attitude of various equipment and the installation attitude of various equipment relative to the aircraft body. During the final assembly process of the aircraft, it is necessary to continuously measure and adjust the GNC points. The posture of various equipment in the system, and finally determine its installation posture and fix it. The existing solution for measuring the attitude of the GNC subsystem equ...
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IPC IPC(8): G01C25/00
CPCG01C25/00
Inventor 林雪竹丁红昌侯茂盛刘涛郭丽丽李丽娟
Owner CHANGCHUN UNIV OF SCI & TECH