CN114935331B - Aviation camera dynamic imaging ground test method - Google Patents
Aviation camera dynamic imaging ground test method Download PDFInfo
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- CN114935331B CN114935331B CN202210594210.2A CN202210594210A CN114935331B CN 114935331 B CN114935331 B CN 114935331B CN 202210594210 A CN202210594210 A CN 202210594210A CN 114935331 B CN114935331 B CN 114935331B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C11/00—Photogrammetry or videogrammetry, e.g. stereogrammetry; Photographic surveying
- G01C11/02—Picture taking arrangements specially adapted for photogrammetry or photographic surveying, e.g. controlling overlapping of pictures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to an airborne camera ground test method, in particular to an aviation camera dynamic imaging ground test method, which is used for solving the defect that the existing aviation camera ground test system cannot meet the comprehensive test requirement of an aviation camera. The aerial camera dynamic imaging ground test system comprises a supporting mechanism, a gesture simulation mechanism and a target simulation mechanism; the gesture simulation mechanism hoisted on the supporting mechanism can simulate the gesture changes of pitching, rolling and yawing in the flight of the aircraft, simulate the vibration of the aircraft body by simulating the vibration frequency and amplitude of the aircraft in different directions, and provide a highly-restored test environment for the aviation camera technical index test; the target simulation mechanism realizes simultaneous testing of a static target and a moving target, and can meet the testing requirements of an aerial camera on the static and moving targets on the ground.
Description
Technical Field
The invention relates to an airborne camera ground test method, in particular to an aviation camera dynamic imaging ground test method.
Background
With the rapid application of various unmanned aerial vehicle platform technologies, the photoelectric imaging load for unmanned aerial vehicles is more and more, and particularly, the application of an aerial remote sensing measurement load system meeting the requirements of low illumination, large breadth and high-precision positioning is very wide.
With the increase of application requirements, the functions and technical index systems of the photoelectric load system become more complex. Because the aerial camera is subject to the working characteristics of the installation structure and the inertial navigation system, the ground test system is required to simulate vibration and attitude disturbance when a real aircraft flies on the ground, and comprehensively test technical indexes such as image motion compensation and stability precision of the aerial camera and related functions under the simulation condition, however, in the prior art, no report on the ground test system of the aerial camera, which can meet the comprehensive test requirement of the aerial camera, is seen yet.
Disclosure of Invention
The invention aims to solve the defect that the existing aerial camera ground test system cannot meet the comprehensive test requirement of an aerial camera, and provides a dynamic imaging ground test method of an aerial camera.
In order to solve the defects existing in the prior art, the invention provides the following technical solutions:
the utility model provides an aviation camera dynamic imaging ground test system which characterized in that: comprises a supporting mechanism, a gesture simulation mechanism and a target simulation mechanism;
the support mechanism comprises a first guide rail and a first sliding block arranged on the first guide rail, a gesture simulation mechanism is arranged at the lower end of the first sliding block, the gesture simulation mechanism comprises a three-axis turntable which can move along a pitching axis, a rolling axis and an azimuth axis, and the three-axis turntable is connected with an aerial camera to be tested through a mounting bottom plate;
the target simulation mechanism is arranged below the gesture simulation mechanism and comprises a dynamic target component and a static target component; the dynamic target assembly comprises a second guide rail with an extending direction perpendicular to the first guide rail and a movement mounting bracket arranged on the second guide rail, the movement mounting bracket can move along the extending direction of the second guide rail, and a first optical test module serving as a movement target is arranged on the movement mounting bracket; the static target assembly comprises a static target base and a plurality of static mounting brackets, the extending direction of the static target base is perpendicular to the first guide rail, the static mounting brackets are arranged on the static target base, and a second optical test module serving as a static target is arranged on each static mounting bracket; the second guide rail is parallel to the static target base.
Further, the supporting mechanism comprises two upright posts and a cross beam arranged between the two upright posts, and the first guide rail is arranged on the cross beam.
Further, a rack is arranged on the second guide rail, a gear is arranged on the driving movement mounting bracket, and the movement mounting bracket moves on the second guide rail in a driving mode of a gear-rack structure.
Meanwhile, the invention provides a ground test method for dynamic imaging of an aerial camera, which is characterized by comprising the following steps of:
the method comprises the steps of connecting an aviation camera with a three-axis turntable through a mounting bottom plate, simulating the attitude change of an aircraft on a pitching axis, a transverse rolling axis and an azimuth axis through the three-axis turntable, simulating the vibration of a fuselage through adjusting the vibration frequency and the vibration amplitude, and providing a real test environment for fully verifying other technical indexes of the aviation camera;
step 2, static field angle test;
setting a second optical test module on a static mounting bracket, and adjusting a cursor generated by the second optical test module to a preset starting point, wherein the preset starting point is positioned at the edge of an aerial camera image to be tested; rotating a pitching shaft of the three-axis table to enable the cursor to move to a preset end point, wherein the preset end point is positioned at the edge of the side corresponding to the preset starting point of the aerial camera image to be tested; the angle rotated by the pitching axis of the three-axis table is the static field angle of the aerial camera;
step 3, testing the accommodating width;
a second optical test module is respectively arranged on the two static mounting brackets; rotating a roll shaft of the three-axis table to the maximum value of one end of the roll sweep, and adjusting the pitching angle of a second optical test module to enable a cursor of the second optical test module to be positioned at the center of an aerial camera image to be tested; rotating a roll shaft of the three-axis table to the maximum value at the other end of the roll sweep, and adjusting the pitching angle of the other second optical test module to enable a cursor of the second optical test module to be positioned at the center of an aerial camera image to be tested;
the sum of the pitching angle relative values of the two second optical test modules is equal to the included angle between the maximum values at the two ends of the roll sweep, so that the accommodating width test is completed;
step 4, performing a dynamic environment lower swing scanning image motion compensation precision test;
the first optical test module is arranged on the motion mounting support, the motion mounting support moves on the second guide rail at a uniform speed, the transverse rolling shaft of the three-axis turntable is controlled to swing and sweep at a uniform speed in the motion direction of the first optical test module, and meanwhile, the aerial camera continuously shoots, targets of the first optical test module are imaged, and the swing and sweep image motion compensation precision of the aerial camera is judged through the imaging effect.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention relates to an aerial camera dynamic imaging ground test system which comprises a supporting mechanism, a gesture simulation mechanism and a target simulation mechanism, wherein the supporting mechanism is used for supporting a target; the gesture simulation mechanism hoisted on the supporting mechanism can simulate the gesture changes of pitching, rolling and yawing in the flight of the aircraft, simulate the vibration of the aircraft body by simulating the vibration frequency and amplitude of the aircraft in different directions, and provide a highly-restored test environment for the aviation camera technical index test; the target simulation mechanism realizes simultaneous testing of a static target and a moving target, and can meet the testing requirements of an aerial camera on the static and moving targets on the ground.
(2) According to the aerial camera dynamic imaging ground test method, the motion capacity of the three-axis turntable and the parameters of the first optical test module and the second optical test module can be matched according to the technical parameters of the aerial camera, so that the real performance of the aerial camera can be reflected in the technical index test.
Drawings
FIG. 1 is a schematic diagram of an embodiment of an aerodynamically imaged ground test system in accordance with the present invention;
fig. 2 is a left side view of fig. 1.
The reference numerals are explained as follows: 1-a supporting mechanism, 11-a first guide rail, 12-a first sliding block, 13-an upright post and 14-a cross beam; 21-a three-axis turntable; 31-second guide rail, 311-motion mounting bracket, 32-static target base, 321-static mounting bracket.
Detailed Description
The invention will be further described with reference to the drawings and specific examples.
Referring to fig. 1 and 2, an aerial camera dynamic imaging ground test system comprises a support mechanism 1, a gesture simulation mechanism and a target simulation mechanism.
The supporting mechanism 1 comprises two upright posts 13 and a cross beam 14 arranged between the two upright posts 13, a first guide rail 11 is arranged at the lower part of the cross beam 14, a first sliding block 12 is arranged on the first guide rail 11, a gesture simulation mechanism is arranged at the lower end of the first sliding block 12, the gesture simulation mechanism comprises a three-axis turntable 21 capable of moving along a pitching axis, a rolling axis and an azimuth axis, and the three-axis turntable 21 is connected with an aerial camera to be tested through a mounting bottom plate.
The target simulation mechanism is arranged below the gesture simulation mechanism and comprises a dynamic target component and a static target component; the dynamic target assembly comprises a second guide rail 31 which is perpendicular to the first guide rail 11 and a movement mounting bracket 311 which is arranged on the second guide rail 31, wherein a rack is arranged on the second guide rail 31, a gear is arranged on the movement mounting bracket 311, the movement mounting bracket 311 moves on the second guide rail 31 in a gear rack structure driving mode, a first optical test module which is used as a movement target is arranged on the movement mounting bracket 311, and the movement mounting bracket 311 has a pitching movement adjusting function; the static target assembly comprises a static target base 32 arranged perpendicular to the first guide rail 11 and a plurality of static mounting brackets 321 arranged on the static target base 32, wherein each static mounting bracket 321 is provided with a second optical test module serving as a static target; the second guide rail 31 is parallel to the stationary target base 32.
By adopting the aerial camera dynamic imaging ground test system, the invention provides an aerial camera dynamic imaging ground test method, which comprises the following steps:
the aerial camera is connected with the three-axis turntable 21 through the mounting bottom plate, the attitude changes of the aircraft in a pitching axis, a transverse rolling axis and an azimuth axis are simulated through the three-axis turntable 21, and the vibration of the aircraft body is simulated through adjusting the vibration frequency and the vibration amplitude, so that a real test environment is provided for fully verifying other technical indexes of the aerial camera;
step 2, static field angle test;
setting a second optical test module on one static mounting bracket 321, and adjusting a cursor generated by the second optical test module to a preset starting point, wherein the preset starting point is positioned at the edge of an aerial camera image to be tested; rotating a pitching axis of the three-axis table 21 to enable the cursor to move to a preset end point, wherein the preset end point is positioned at the edge of the side corresponding to the preset starting point of the aerial camera image to be tested; the angle rotated by the pitching axis of the three-axis table 21 is the static field angle of the aerial camera;
step 3, testing the accommodating width;
a second optical test module is respectively arranged on the two static mounting brackets 321; rotating the roll shaft of the three-axis table 21 to the maximum value of +56° at one end of the roll sweep, and adjusting the pitch angle of a second optical test module to enable the cursor of the second optical test module to be positioned at the center of the aerial camera image to be tested; rotating the roll shaft of the three-axis table 21 to the maximum value of-56 degrees at the other end of the roll sweep, and adjusting the pitch angle of the other second optical test module to enable the cursor of the second optical test module to be positioned at the center of the aerial camera image to be tested;
the sum of the pitching angle relative values of the two second optical test modules is equal to 112 degrees of included angle between the maximum values at the two ends of the roll sweep, so that the accommodating width test is completed;
step 4, performing a dynamic environment lower swing scanning image motion compensation precision test;
a first optical test module is arranged on the motion mounting bracket 311, so that the motion mounting bracket 311 moves on the second guide rail 31 at a constant speed of 10cm/s, the transverse rolling shaft of the three-axis turntable 21 is controlled to swing and sweep at a constant speed of 30 degrees/s in the motion direction of the first optical test module, and meanwhile, the aerial camera continuously shoots, the target of the first optical test module is imaged, and the swing and sweep image motion compensation precision of the aerial camera is judged through the imaging effect.
Finally, it should be noted that: the foregoing embodiments are merely for illustrating the technical solutions of the present invention, and not for limiting the same, and it will be apparent to those skilled in the art that modifications may be made to the specific technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, without departing from the spirit of the technical solutions protected by the present invention.
Claims (3)
1. An aerial camera dynamic imaging ground test method adopts an aerial camera dynamic imaging ground test system, wherein the aerial camera dynamic imaging ground test system comprises a supporting mechanism (1), a gesture simulation mechanism and a target simulation mechanism;
the supporting mechanism (1) comprises a first guide rail (11) and a first sliding block (12) arranged on the first guide rail (11), a gesture simulation mechanism is arranged at the lower end of the first sliding block (12), the gesture simulation mechanism comprises a three-axis turntable (21) capable of moving along a pitching axis, a rolling axis and an azimuth axis, and the three-axis turntable (21) is connected with an aerial camera to be tested through a mounting bottom plate;
the target simulation mechanism is arranged below the gesture simulation mechanism and comprises a dynamic target component and a static target component; the dynamic target assembly comprises a second guide rail (31) with an extending direction perpendicular to the first guide rail (11) and a movement mounting bracket (311) arranged on the second guide rail (31), wherein the movement mounting bracket (311) can move along the extending direction of the second guide rail (31), and a first optical test module serving as a movement target is arranged on the movement mounting bracket (311); the static target assembly comprises a static target base (32) and a plurality of static mounting brackets (321), wherein the extending direction of the static target base (32) is perpendicular to the first guide rail (11), and each static mounting bracket (321) is provided with a second optical test module serving as a static target; the second guide rail (31) is parallel to the static target base (32);
the method is characterized by comprising the following steps of:
step 1, simulating an airborne environment;
the method comprises the steps that an aviation camera is connected with a three-axis turntable (21) through a mounting bottom plate, the attitude changes of an airplane in a pitching axis, a transverse rolling axis and an azimuth axis are simulated through the three-axis turntable (21), and the vibration of a machine body is simulated through adjusting the vibration frequency and the vibration amplitude, so that a real test environment is provided for fully verifying other technical indexes of the aviation camera;
step 2, static field angle test;
setting a second optical test module on a static mounting bracket (321), and adjusting a cursor generated by the second optical test module to a preset starting point, wherein the preset starting point is positioned at the edge of an aerial camera image to be tested; rotating a pitching axis of the three-axis table (21) to enable the cursor to move to a preset end point, wherein the preset end point is positioned at the edge of the side corresponding to the preset starting point of the image of the aerial camera to be tested; the angle rotated by the pitching axis of the three-axis table (21) is the static field angle of the aerial camera;
step 3, testing the accommodating width;
a second optical test module is respectively arranged on the two static mounting brackets (321); rotating a roll shaft of the three-axis table (21) to the maximum value of one end of the roll sweep, and adjusting the pitching angle of a second optical test module to enable a cursor of the second optical test module to be positioned at the center of an aerial camera image to be tested; rotating a roll shaft of the three-axis table (21) to the maximum value at the other end of the roll sweep, and adjusting the pitch angle of the other second optical test module to enable a cursor of the second optical test module to be positioned at the center of an aerial camera image to be tested;
the sum of the pitching angle relative values of the two second optical test modules is equal to the included angle between the maximum values at the two ends of the roll sweep, so that the accommodating width test is completed;
step 4, performing a dynamic environment lower swing scanning image motion compensation precision test;
a first optical test module is arranged on a motion mounting bracket (311), so that the motion mounting bracket (311) moves on a second guide rail (31) at a constant speed, a transverse rolling shaft of a three-axis turntable (21) is controlled to swing at a constant speed in the motion direction of the first optical test module, and meanwhile, an aerial camera continuously shoots, a target of the first optical test module is imaged, and the swing image movement compensation precision of the aerial camera is judged through an imaging effect.
2. The aerial camera dynamic imaging ground test method of claim 1, wherein: the supporting mechanism (1) comprises two upright posts (13) and a cross beam (14) arranged between the two upright posts (13), and the first guide rail (11) is arranged on the cross beam (14).
3. The aerial camera dynamic imaging ground test method of claim 2, wherein: the second guide rail (31) is provided with a rack, the motion mounting bracket (311) is provided with a gear, and the motion mounting bracket (311) moves on the second guide rail (31) in a gear-rack structure driving mode.
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