CN105045030A - Optical axis jitter measurement method for space optical camera and device - Google Patents
Optical axis jitter measurement method for space optical camera and device Download PDFInfo
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Abstract
The present invention discloses an optical axis jitter measurement method for a space optical camera and a device. The method comprise the steps of measuring the pointing angle of each sampling time of an inertial measurement unit coordinate system Z axis in an integral time section about an inertial space coordinate system x axis, the pointing angle about an inertial space coordinate system y axis and the pointing angle about an inertial space coordinate system z axis, measuring the light spot information of the first and second reference laser beams which enter into the space optical camera in each sampling time and determining the pointing information of a space optical camera optical axis about the x axis, the y axis and the z axis of the inertial space coordinate system in each time according to the light spot information and the three pointing angles, and calculating the jitter of the space optical camera optical axis according to the pointing information of the space optical camera optical axis about the x axis, the y axis and the z axis of the inertial space coordinate system in each time. According to the technical scheme provided by the invention, the sharpness of a remote sensing image can be effectively improved.
Description
Technical field
The present invention relates to optical remote sensing technology field, be specifically related to a kind of optical jitter measuring method for space optical camera and the optical jitter measurement mechanism for space optical camera.
Background technology
For Optical remote satellite, a very important function obtains remote sensing images clearly by space optical camera; But, in Optical remote satellite, inevitably there is micro-vibration environment.Micro-vibration environment can make the optical unit of space optical camera inside shake, and the shake of optical unit can cause space optical camera optical axis to shake, thus the ground Scenery Imaging in section integral time can be caused to create mobile on focal plane or rotate, the sharpness of remote sensing images finally can be caused to decline.Above-mentioned micro-vibration environment may be produced by the cyclical movement of micro-vibration sources such as the momenttum wheel in satellite, solar array driving mechanism, control-moment gyro and antenna direction mechanism, and the structural vibration that also may be caused by the work of ion propeller, Cryo Refrigerator and environmental perturbation produces.The band coverage of the micro-vibration in Optical remote satellite is comparatively large, and it not only can cause space optical camera optical axis to there is micro-oscillation phenomenon, also can affect the attitude of Optical remote satellite.
Inventor is realizing finding in process of the present invention, in order to obtain remote sensing images clearly, usually need to utilize the amount of jitter of space optical camera optical axis to carry out jitter compensation to the remote sensing images that space optical camera absorbs, and the amount of jitter how promptly and accurately comprehensively measuring space optical camera optical axis is a technical matters merited attention.
Summary of the invention
In view of the above problems, the present invention is proposed to provide a kind of overcoming the problems referred to above or the optical jitter measuring method for space optical camera solved the problem at least in part and device.
According to one aspect of the present invention, provide a kind of optical jitter measuring method for space optical camera, the method comprises: produce uneven first reference laser beam and the second reference laser beam mutually by the first lasing light emitter and the second lasing light emitter; Measure Inertial Measurement Unit coordinate system Z axis at the sensing angle of each sampling instant about inertia space reference system x-axis of section integral time, the sensing angle about inertia space reference system y-axis and the sensing angle about inertia space reference system z-axis; Described first reference laser beam and the second reference laser beam is made to enter the optical unit of camera and incide on point visual field of camera focal plane; Measure the first reference laser beam and the second reference laser beam facula position information of each sampling instant on point visual field of camera focal plane in section integral time; According to the facula position information of each sampling instant and the hot spot target position information determination space optical camera optical axis that presets in each sampling instant about the deflection angle of Inertial Measurement Unit coordinate system x-axis and space optical camera optical axis in the deflection angle of each sampling instant about Inertial Measurement Unit coordinate system y-axis; According to described each sampling instant about Inertial Measurement Unit coordinate system x-axis deflection angle and the sensing angle about inertia space reference system x-axis superpose and with superposing of the sensing angle about inertia space reference system y-axis, deflection angle about Inertial Measurement Unit coordinate system y-axis determines that space optical camera optical axis is at the directional information of each sampling instant about the x-axis of inertia space reference system and the directional information of y-axis; With superposing of the described deflection angle about Inertial Measurement Unit coordinate system z-axis, the quadrilateral determination space optical camera optical axis formed according to two facula position information of each sampling instant and two hot spot target position informations presetting in the deflection angle of each sampling instant about Inertial Measurement Unit coordinate system z-axis, and determines that space optical camera optical axis is at the directional information of each sampling instant about the z-axis of inertia space reference system about the sensing angle of inertia space reference system z-axis in each sampling instant according to Inertial Measurement Unit coordinate system z-axis; According to space optical camera optical axis in the shake of each sampling instant about the directional information determination space optical camera optical axis of the directional information of the x-axis of inertia space reference system, the directional information of y-axis and z-axis.
According to another aspect of the invention, provide a kind of optical jitter measurement mechanism for space optical camera, this device mainly comprises inertial reference laser cell, prism of corner cube, primary importance detector, second place detector, XY superposition unit and Z arithmetic element, inertial reference laser cell, for producing uneven first reference laser beam and the second reference laser beam mutually by the first lasing light emitter and the second lasing light emitter, and measure Inertial Measurement Unit coordinate system z-axis at the sensing angle of each sampling instant about inertia space reference system x-axis of section integral time, the sensing angle about inertia space reference system y-axis and the sensing angle about inertia space reference system z-axis, prism of corner cube, is arranged in the light path of the first reference laser beam and the second reference laser beam, enters the optical unit of camera for making described first reference laser beam and the second reference laser beam and incides point visual field of camera focal plane, primary importance detector, is arranged on point visual field of camera focal plane, and is rigidly connected with camera focal plane, for measuring each sampling instant facula position information on point visual field of camera focal plane of the first reference laser beam in section described integral time, second place detector, is arranged on point visual field of camera focal plane, and is rigidly connected with camera focal plane, for measuring each sampling instant facula position information on point visual field of camera focal plane of the second reference laser beam in section described integral time, XY superposition unit, for according to described facula position information and the hot spot target position information determination space optical camera optical axis that presets in each sampling instant about the deflection angle of Inertial Measurement Unit coordinate system x-axis and space optical camera optical axis in the deflection angle of each sampling instant about Inertial Measurement Unit coordinate system y-axis, and according to the described deflection angle about Inertial Measurement Unit coordinate system x-axis and the sensing angle about inertia space reference system x-axis superpose and with superposing of the sensing angle about inertia space reference system y-axis, deflection angle about Inertial Measurement Unit coordinate system y-axis determines that space optical camera optical axis is at the directional information of each sampling instant about the x-axis of inertia space reference system and the directional information of y-axis, Z arithmetic element, for the quadrilateral determination space optical camera optical axis that formed according to two facula position information and two hot spot target position informations presetting in the deflection angle of each sampling instant about Inertial Measurement Unit coordinate system z-axis, and determine that space optical camera optical axis at each sampling instant directional information about the z-axis of inertia space reference system about the sensing angle of inertia space reference system z-axis with superposing of the described deflection angle about Inertial Measurement Unit coordinate system z-axis in each sampling instant according to Inertial Measurement Unit coordinate system z-axis, Jitter Calculation module, for being converted into the shake of space optical camera optical axis in each sampling instant about the directional information of the directional information of the x-axis of inertia space reference system, the directional information of y-axis and z-axis by space optical camera optical axis.
Optical jitter measuring method for space optical camera provided by the invention and device at least have following advantages and beneficial effect: the present invention is by introducing uneven two reference laser beam mutually, and measure Inertial Measurement Unit coordinate system Z axis at the sensing angle of each sampling instant about inertia space reference system x-axis of section integral time, the sensing angle about inertia space reference system y-axis and the sensing angle about inertia space reference system z-axis, the sensing angle information of each sampling instant of Inertial Measurement Unit coordinate system Z axis in each of section can be obtained integral time; By utilizing the facula position information of two reference laser beam after entering the optical unit of camera on point visual field of camera focal plane, can obtain integral time section each sampling instant space optical camera optical axis relative to the changes in deflection of each axle of Inertial Measurement Unit coordinate system; By utilizing above-mentioned sensing angle and above-mentioned changes in deflection just can obtain the sensing of each sampling instant of space optical camera optical axis in section integral time, thus utilize the sensing of different sampling instant promptly and accurately can know space optical camera optical axis jitter conditions in three directions in integral time section; And then utilize technical scheme provided by the invention can realize carrying out the remote sensing images of space optical camera picked-up the jitter compensation in three directions, the sharpness of remote sensing images can be improved largely.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to technological means of the present invention can be better understood, and can be implemented according to the content of instructions, and can become apparent, below especially exemplified by the specific embodiment of the present invention to allow above and other objects of the present invention, feature and advantage.
Accompanying drawing explanation
By reading hereafter detailed description of the preferred embodiment, various other advantage and benefit will become cheer and bright for those of ordinary skill in the art.The accompanying drawing of the present embodiment only for illustrating the object of preferred implementation, and does not think limitation of the present invention.And in whole accompanying drawing, represent identical parts by identical reference symbol.In the accompanying drawings:
Fig. 1 is the three-dimensional system of coordinate schematic diagram of Inertial Measurement Unit;
Fig. 2 is the optical jitter measuring method process flow diagram for space optical camera of the present invention;
Fig. 3 is the facula position change schematic diagram of the inertial reference laser beam of the embodiment of the present invention;
Fig. 4 is the optical jitter measurement mechanism schematic diagram for space optical camera of the present invention;
Fig. 5 is the structural representation of the inertial reference laser cell of the embodiment of the present invention.
Description of reference numerals:
1 inertial reference laser cell; 2 first reference laser beam; 3 second reference laser beam;
4 prism of corner cubes; 5 camera primary mirrors; 6 camera secondary mirrors;
7 camera focal planes; 8 primary importance detectors; 9 second place detectors;
10 camera internal shake the optical axis deflection angle information A caused;
11 fixed stars; 12 star sensors; 13 calibration unit;
14 Inertial Measurement Unit Z axis point to angle information;
15XY superposition unit;
16X and Y-direction optical axis point to measurement result;
17 camera internal shake the optical axis deflection angle information caused;
18 length of side arithmetic elements; 19Z superposition unit;
20Z direction optical axis points to measurement result;
21 camera force bearing plates; 22 are taken target; 23 imagings;
The center of 24 primary importance detectors, is denoted as an A
0;
25 at sampling instant T
kthe hot spot of the first reference laser beam, in the position of primary importance detector, is denoted as an A
k;
The center of 26 second place detectors, is denoted as a B
0;
27 at sampling instant T
kthe hot spot of the second reference laser beam, in the position of second place detector, is denoted as a B
k;
28 first Laser output assemblies; 29 second Laser output assemblies;
30 inertial sensors; 31 pedestals.
Embodiment
Below with reference to accompanying drawings exemplary embodiment of the present invention is described in more detail.Although show exemplary embodiment of the present invention in accompanying drawing, however should be appreciated that can realize the present invention in a variety of manners and not should limit by the embodiment set forth here.On the contrary, provide these embodiments to be in order to more thoroughly the present invention can be understood, and complete for scope of the present invention can be conveyed to those skilled in the art.
Inertial Measurement Unit of the present invention has the three-dimensional system of coordinate be made up of orthogonal x-axis, y-axis, z-axis, and this three-dimensional system of coordinate can be called Inertial Measurement Unit coordinate system, and namely Inertial Measurement Unit coordinate system is fixedly connected with Inertial Measurement Unit.If Inertial Measurement Unit to be reduced to cylindrical words, then this three-dimensional system of coordinate can be as shown in Figure 1.In Fig. 1, the right cylinder of lower left is the Inertial Measurement Unit be simplified, and this Inertial Measurement Unit is arranged on camera force bearing plate 21, thus Inertial Measurement Unit and camera primary mirror 5 are rigidly connected, the x-axis of Inertial Measurement Unit coordinate system and y-axis are by Inertial Measurement Unit axis a bit being pointed to outside, z-axis points to the central point in the region that is taken by the intersection point of x-axis and y-axis, namely can be defined as (can referred to as camera optical axis along space optical camera optical axis for z-axis, also can be described as camera imaging light optical axis) point to the direction of target of being taken, when not considering that camera internal optical unit is shaken, if send beam of laser along z-axis, and this laser is introduced into space optical camera through prism of corner cube, then the hot spot of this laser should be positioned at the central point of space optical camera focal plane.The definition of this three-dimensional system of coordinate meets right-hand rule.
Below in conjunction with Fig. 2 to Fig. 5, the optical jitter measuring method for space optical camera of the present invention and device are described in detail respectively.
Embodiment one, optical jitter measuring method for space optical camera.The flow process of the method as shown in Figure 2.
In Fig. 2, S200, produce uneven first reference laser beam and the second reference laser beam mutually by the first lasing light emitter and the second lasing light emitter.
Concrete, for describe clear for the purpose of, the laser beam that the first lasing light emitter produces is called the first reference laser beam by the present embodiment, and the laser beam of the second lasing light emitter generation is called the second reference laser beam.There is non-vanishing angle between first reference laser beam and the second reference laser beam, namely the first reference laser beam and the second reference laser beam are not parallel to each other.
S210, measurement Inertial Measurement Unit coordinate system Z axis are at the sensing angle of each sampling instant about inertia space reference system x-axis of section integral time, the sensing angle about inertia space reference system y-axis and the sensing angle about inertia space reference system z-axis.
Concrete, the space optical camera optical axis in the present embodiment refers to each sampling instant sensing angle relative to inertia space reference system x-axis for (following abbreviation about the sensing angle of inertia space reference system x-axis) of space optical camera optical axis in section integral time in each sampling instant of section integral time about the sensing angle of inertia space reference system x-axis; Same, space optical camera optical axis refers to each sampling instant sensing angle relative to inertia space reference system y-axis for (following abbreviation about the sensing angle of inertia space reference system y-axis) of space optical camera optical axis in section integral time in each sampling instant of section integral time about the sensing angle of inertia space reference system y-axis, and space optical camera optical axis refers to each sampling instant sensing angle relative to inertia space reference system z-axis for (following abbreviation about the sensing angle of inertia space reference system z-axis) of space optical camera optical axis in section integral time in each sampling instant of section integral time about the sensing angle of inertia space reference system z-axis.
The present embodiment should perform above-mentioned three measurements operations pointing to angles in each sampling instant of each of section integral time.The present embodiment can utilize the Inertial Measurement Unit be installed on space optical camera to point to angle to measure above-mentioned three, and Inertial Measurement Unit and space optical camera are rigidly connected.
Be provided with measuring basis three-dimensional system of coordinate in the Inertial Measurement Unit of the present embodiment, Inertial Measurement Unit carries out above-mentioned three based on this measuring basis three-dimensional system of coordinate to point to the measurement at angle.The present embodiment can not carry out calibration to this measuring basis three-dimensional system of coordinate; Certainly, the present embodiment also can carry out real-time calibration according to inertia space reference system to this measuring basis three-dimensional system of coordinate, such as, utilize the star sensor in Inertial Measurement Unit to carry out calibration in-orbit to this measuring basis three-dimensional system of coordinate, thus the measuring basis three-dimensional system of coordinate in Inertial Measurement Unit and inertia space reference system are consistent as much as possible.Carrying out in the application scenarios of calibration in-orbit to this measuring basis three-dimensional system of coordinate, can think: Inertial Measurement Unit carries out the measurement at above-mentioned sensing angle based on inertia space reference system, that is, although Inertial Measurement Unit is three sensing angles of measuring based on measuring basis three-dimensional system of coordinate, but because this measuring basis three-dimensional system of coordinate and inertia space reference system are consistent, therefore, three sensing angles that Inertial Measurement Unit is measured can be considered to the sensing angle about inertia space reference system x-axis, about the sensing angle of inertia space reference system y-axis and the sensing angle about inertia space reference system z-axis, namely three the sensing angles measuring acquisition can be considered to definitely point to angle.
The present embodiment utilizes star sensor to the example that the measuring basis three-dimensional system of coordinate in Inertial Measurement Unit carries out of calibration concrete to be: satellite is period in-orbit, regularly read the information in star sensor based on predetermined time interval, and utilize this information to carry out regularly calibration in-orbit respectively to the x-axis of the measuring basis three-dimensional system of coordinate in Inertial Measurement Unit, y-axis and z-axis.The present embodiment carries out calibration in-orbit by utilizing star sensor to the measuring basis three-dimensional system of coordinate in Inertial Measurement Unit, effectively can ensure accuracy of measurement and the measuring accuracy at three sensing angles that Inertial Measurement Unit is measured during satellite in-orbit.
S220, the first reference laser beam and the second reference laser beam is made to enter the optical unit of camera and incide on point visual field of camera focal plane.
Concrete, the present embodiment can utilize prism of corner cube to make the first reference laser beam and the second reference laser beam enter the optical unit of camera, first reference laser beam and the second reference laser beam after entering the optical unit of camera via light path and the target that is taken imaging via light path be identical, that is, first reference laser beam and the second reference laser beam process optical unit than the target that is taken imaging the many prism of corner cube of the optical unit of process, first reference laser beam is identical with the light path of the imaging of the target that is taken in the light path after prism of corner cube with the second reference laser beam.Here light path is identical does not refer to that the incident angle comprising light is all identical, and refer to each optical unit of process identical; A concrete example, first reference laser beam and the second reference laser beam are inciding on camera primary mirror respectively after prism of corner cube, then, incide on camera secondary mirror respectively after via camera primary mirror, afterwards, incide on point visual field of camera focal plane after via camera secondary mirror.
Point visual field of the camera focal plane in the present embodiment can for being positioned at primary importance detector in the outward extending plane in camera focal plane and second place detector, and primary importance detector and second place detector and camera focal plane are rigidly connected respectively, namely camera focal plane, primary importance detector and second place detector can regard a rigid body as.
It should be noted that, although this step S220 describes after step S210, but in actual applications, between S210 and S220, to there is not the restriction of successively execution sequence.
S230, measure the first reference laser beam and the second reference laser beam facula position information of each sampling instant on point visual field of camera focal plane in section integral time.
Concrete, the present embodiment can utilize primary importance detector to measure the first reference laser beam at the facula position of each sampling instant on point visual field of camera focal plane of section integral time, thus obtain the facula position information of each sampling instant first reference laser beam, utilize second place detector to measure the second reference laser beam at the facula position of each sampling instant on point visual field of camera focal plane of section integral time simultaneously, thus obtain the facula position information of each sampling instant second reference laser beam.
A concrete example, as shown in Figure 3, A
0represent the central point 24, A of primary importance detector 8
krepresent the sampling instant T in section integral time
ktime the first reference laser beam the location point 25, B of hot spot on primary importance detector 8
0represent the central point 26, B of second place detector 9
krepresent the sampling instant T in section integral time
ktime the second reference laser beam the location point 27 of hot spot on second place detector 9; The positional information of location point 25 and the positional information of location point 27 are respectively the first reference laser beam and the second reference laser beam facula position information of some sampling instants on point visual field of camera focal plane in section integral time.
S240, according to the facula position information of each sampling instant and the hot spot target position information determination space optical camera optical axis that presets in each sampling instant about the deflection angle of Inertial Measurement Unit coordinate system x-axis and space optical camera optical axis in the deflection angle of each sampling instant about Inertial Measurement Unit coordinate system y-axis, according to each sampling instant about Inertial Measurement Unit coordinate system x-axis deflection angle and the sensing angle about inertia space reference system x-axis superpose and with superposing of the sensing angle about inertia space reference system y-axis, deflection angle about Inertial Measurement Unit coordinate system y-axis determines that space optical camera optical axis is at the directional information of each sampling instant about the x-axis of inertia space reference system and the directional information of y-axis.
Concrete, hot spot target position information in the present embodiment is set to the center (i.e. central point) of position sensor usually, namely when without any shake, the hot spot of the first reference laser beam should be incident upon the center of primary importance detector, and the hot spot of the second reference laser beam should be positioned at the center of second place detector.Certainly, the hot spot target position information in the present embodiment also can be set to other positions except the center of position sensor.
First the present embodiment can utilize the facula position information of hot spot target position information and the above-mentioned acquisition preset to determine, and the displacement of the lines of the first reference laser beam/the second reference laser beam hot spot is (as the line segment A in Fig. 3
0a
kor line segment B
0b
k), then, the displacement of the lines recycling the first reference laser beam/the second reference laser beam hot spot to determine space optical camera optical axis in each sampling instant about the deflection angle (following referred to as x deflection angle) of Inertial Measurement Unit coordinate system x-axis and space optical camera optical axis in the deflection angle (following referred to as y deflection angle) of each sampling instant about Inertial Measurement Unit coordinate system y-axis.The present embodiment can utilize multiple transfer algorithm displacement of the lines to be converted to x deflection angle and y deflection angle, and concrete transfer process no longer describes in detail at this.
Based on the first reference laser beam, the present embodiment can determine that space optical camera optical axis is at the directional information of each sampling instant about the x-axis of inertia space reference system and the directional information of y-axis, also can determine that space optical camera optical axis is at the directional information of each sampling instant about the x-axis of inertia space reference system and the directional information of y-axis based on the second reference laser beam, can also determine that space optical camera optical axis is at the directional information of each sampling instant about the x-axis of inertia space reference system and the directional information of y-axis based on the first reference laser beam and the second reference laser beam simultaneously.
First concrete example: utilize based on the first laser beam in the facula position information of each sampling instant and x deflection angle and the y deflection angle of determining each sampling instant for the hot spot target position information that the first laser beam is arranged, then, for each sampling instant, perform the operation being carried out in x deflection angle and the above-mentioned sensing angle about inertia space reference system x-axis superposing respectively, and perform the operation being carried out in y deflection angle and the above-mentioned sensing angle about inertia space reference system y-axis superposing respectively, for each sampling instant, two angles produced after utilizing superposition just can determine that space optical camera optical axis is at the directional information of each sampling instant about the x-axis of inertia space reference system and the directional information of y-axis.
Second concrete example: utilize based on the second laser beam in the facula position information of each sampling instant and x deflection angle and the y deflection angle of determining each sampling instant for the hot spot target position information that the second laser beam is arranged, then, for each sampling instant, perform the operation being carried out in x deflection angle and the above-mentioned sensing angle about inertia space reference system x-axis superposing respectively, and perform the operation being carried out in y deflection angle and the above-mentioned sensing angle about inertia space reference system y-axis superposing respectively, for each sampling instant, two angles produced after utilizing superposition just can determine that space optical camera optical axis is at the directional information of each sampling instant about the x-axis of inertia space reference system and the directional information of y-axis.
3rd concrete example: utilize based on the first laser beam in the facula position information of each sampling instant and x deflection angle and the y deflection angle of determining each sampling instant for the hot spot target position information that the first laser beam is arranged, then, for each sampling instant, perform the operation being carried out in x deflection angle and the above-mentioned sensing angle about inertia space reference system x-axis superposing respectively, and perform the operation being carried out in y deflection angle and the above-mentioned sensing angle about inertia space reference system y-axis superposing respectively, thus obtain an x superposition angle and a y superposition angle of each sampling instant, simultaneously, utilize based on the second laser beam each sampling instant facula position information and determine x deflection angle and the y deflection angle of each sampling instant for the hot spot target position information that the second laser beam is arranged, then, for each sampling instant, perform the operation being carried out in x deflection angle and the above-mentioned sensing angle about inertia space reference system x-axis superposing respectively, and perform the operation being carried out in y deflection angle and the above-mentioned sensing angle about inertia space reference system y-axis superposing respectively, thus obtain the 2nd x superposition angle and the 2nd y superposition angle of each sampling instant, then, for each sampling instant, obtained the x angle of each sampling instant by the average calculating an x superposition angle and the 2nd x superposition angle, and obtain the y angle of each sampling instant by the average of calculating the one y superposition angle and the 2nd y superposition angle, thus space optical camera optical axis is at the directional information of each sampling instant about the x-axis of inertia space reference system to utilize the x angle of each sampling instant of above-mentioned acquisition just can determine, space optical camera optical axis is at the directional information of each sampling instant about the y-axis of inertia space reference system to utilize the y angle of each sampling instant of above-mentioned acquisition just can determine.
Space optical camera optical axis in the present embodiment can be angle value in each sampling instant about the directional information of the x-axis of inertia space reference system, also can be displacement of the lines value, and space optical camera optical axis can be angle value in each sampling instant about the directional information of the y-axis of inertia space reference system equally, also can be displacement of the lines value.
With superposing of the deflection angle about Inertial Measurement Unit coordinate system z-axis, S250, the quadrilateral determination space optical camera optical axis that formed according to two facula position information of each sampling instant and the hot spot target position information that presets in the deflection angle of each sampling instant about Inertial Measurement Unit coordinate system z-axis, and determine that space optical camera optical axis is at the directional information of each sampling instant about the z-axis of inertia space reference system about the sensing angle of inertia space reference system z-axis in each sampling instant according to Inertial Measurement Unit coordinate system z-axis.
Concrete, as shown in Figure 3, some A
0, some A
k, some B
0and some B
kthese four points form a quadrilateral, utilize this quadrilateral just can calculate certain sampling instant in correspondence of space optical camera optical axis about the deflection angle (following referred to as z deflection angle) of Inertial Measurement Unit coordinate system z-axis, such as, first calculate the length of side on each limit of this quadrilateral, then utilize the length of side on each limit (namely utilizing the geometric relationship on each limit) just can calculate angle γ in Fig. 3
k', this angle γ
k' be z deflection angle.The present embodiment can utilize multiple computing method to obtain angle γ by the length of side
k', at this, concrete computing method are no longer described in detail.The space optical camera optical axis that the present embodiment obtains based on superposition can for angle value, also can be displacement of the lines value in each sampling instant about the directional information of the z-axis of inertia space reference system.
S260, according to space optical camera optical axis in the shake of each sampling instant about the directional information computer memory optical camera optical axis of the directional information of the x-axis of inertia space reference system, the directional information of y-axis and z-axis.
A concrete example, the space optical camera optical axis that the space optical camera optical axis each sampling instant obtained obtains with integration initial time respectively about the directional information of the directional information of the x-axis of inertia space reference system, the directional information of y-axis and z-axis carries out difference operation about the directional information of the directional information of the x-axis of inertia space reference system, the directional information of y-axis and z-axis, can obtain the amount of jitter of space optical camera optical axis on xyz tri-directions of each sampling instant.
If using sampling instant as horizontal ordinate, and using space optical camera optical axis about the amount of jitter (as angle value) of a certain axle as ordinate, then in an integral time section, space optical camera optical axis can form a curve or broken line or straight line in each sampling instant about the amount of jitter of a certain axle, and space optical camera optical axis is in each sampling instant shake in the corresponding direction to utilize this curve or broken line or straight line just can determine.
From the description of above-mentioned the present embodiment, because the amount of jitter of the space optical camera optical axis in the present embodiment on xyz tri-directions of each sampling instant is the relative value obtained based on two sampling instants, therefore, no matter whether the measuring basis coordinate in the present embodiment carries out calibration in-orbit, the final amount of jitter obtained is substantially identical.
Embodiment two, optical jitter measurement mechanism for space optical camera.The structure of this device as shown in Figure 4.
In Fig. 4, the optical jitter measurement mechanism for space optical camera of the present embodiment comprises: inertial reference laser cell 1, star sensor 12, calibration unit 13, prism of corner cube 4, primary importance detector 8 (i.e. position sensor A), second place detector 9 (i.e. position sensor B), XY superposition unit 15, Z arithmetic element and Jitter Calculation module; Z arithmetic element wherein can comprise: length of side arithmetic element 18 and Z superposition unit 19.
The Optical remote satellite being provided with the optical jitter measurement mechanism for space optical camera of the present embodiment can be reduced to two large divisions, wherein a part is Inertial Measurement Unit (being positioned at the left field outside Fig. 4 dotted line frame), another part is space optical camera (also can be called optical imaging system, the part namely in Fig. 4 within dotted line frame).
Inertial Measurement Unit in Optical remote satellite after simplification mainly comprises: inertial reference laser cell 1.In application scenes, Inertial Measurement Unit can also comprise: star sensor 12 (also can be called Star Sensor) and calibration unit 13, and star sensor 12 and inertial reference laser cell 1 are rigidly connected, namely Inertial Measurement Unit can be considered as a rigid body.Inertial Measurement Unit and space optical camera rigidly connected, as Inertial Measurement Unit is rigidly fixed on the force bearing plate of space optical camera, thus make Inertial Measurement Unit and space optical camera become a rigid body.
Space optical camera (part namely in Fig. 4 within dotted line frame) in Optical remote satellite after simplification mainly comprises: camera primary mirror 5, camera secondary mirror 6, prism of corner cube 4, camera focal plane 7, primary importance detector 8, second place detector 9 and camera force bearing plate 21; Camera focal plane 7, primary importance detector 8 and second place detector 9 three are rigidly connected, and can be considered as a rigid body.During this space optical camera operation on orbit, the imaging 23 sent from the target 22 that is taken, after the optical units such as camera primary mirror 5 and camera secondary mirror 6, arrives camera focal plane 7 imaging.
Inertial reference laser cell 1 is mainly used in producing uneven first reference laser beam and the second reference laser beam mutually by the first lasing light emitter and the second lasing light emitter, and measures Inertial Measurement Unit coordinate system Z axis at the sensing angle of each sampling instant about inertia space reference system x-axis of section integral time, the sensing angle about inertia space reference system y-axis and the sensing angle about inertia space reference system z-axis.
Concrete, an example of inertial reference laser cell 1 is as shown in Figure 5; Inertial reference laser cell 1 in Fig. 5 comprises: pedestal 31, first Laser output assembly 28 (i.e. Laser output assembly A, also i.e. the first lasing light emitter), the second Laser output assembly 29 (i.e. Laser output assembly B is also the second lasing light emitter) and multiple inertial sensor 30.
Pedestal 31 is mainly used in rigidly fixing the first Laser output assembly 28, second Laser output assembly 29 and multiple inertial sensor 30.Pedestal 31 can also rigidly fix as with star sensor 12 structure be connected, and makes star sensor 12 and inertial reference laser cell 1 form a rigid body.
First Laser output assembly 28 is mainly for generation of the first reference laser beam 2 (i.e. reference laser beam A), second Laser output assembly 29 is mainly for generation of the second reference laser beam 3 (i.e. reference laser beam B), and the first reference laser beam 2 is not parallel to each other mutually with the second reference laser beam 3.
Multiple inertial sensor 30 is mainly used in measuring the sensing angle of Inertial Measurement Unit coordinate system Z axis about inertia space reference system x-axis, the sensing angle about inertia space reference system y-axis and the sensing angle about inertia space reference system z-axis.Inertial sensor 30 can adopt gyro, realize based on the element such as angular displacement sensor of magnetic fluid.Inertial sensor 30 in the present embodiment should have higher angle measurement accuracy, wider bandwidth of operation and lower measurement noises, and inertial sensor 30 is when star sensor 12 on-orbit calibration, the high-precision angle displacement measurement of high accuracy can be realized constantly.
The installation site of multiple inertial sensor 30 should according to actual conditions reasonable arrangement, so that accurately and timely can measure the sensing angle of space optical camera optical axis about inertia space reference system x-axis, the sensing angle about inertia space reference system y-axis and the sensing angle about inertia space reference system z-axis.
Calibration unit 13 is mainly used in utilizing the measuring basis three-dimensional system of coordinate of star sensor 12 pairs of Inertial Measurement Units to carry out calibration, and namely calibration unit 13 utilizes the measuring basis three-dimensional system of coordinate of each inertial sensor 30 of star sensor 12 in-orbit in calibration inertial reference laser cell.Satellite is in orbit in process, often there is the problem such as bias instaility and random walk in inertial sensor 30, like this, after satellite uses for a long time in-orbit, the phenomenon that the measuring error that there will be inertial sensor 30 increases, and star sensor 12 is owing to being be benchmark with fixed star 11 light of stable inertia, therefore there is not the problems such as zero drift, thus the calibration unit 13 of the present embodiment can correct the measured deviation of each inertial sensor 30 in real time in-orbit based on star sensor 12, make each inertial sensor 30 can have continual and steady angle measurement performance accurately.
Prism of corner cube 4 is mainly used in the first reference laser beam 2 and the second reference laser beam 3 to be all introduced in space optical camera (i.e. optical imaging system), make the first reference laser beam 2 and the second reference laser beam 3 along the propagated identical with the imaging 23 of the target 22 that is taken, namely the first reference laser beam 2 and the second reference laser beam 3 are after respectively through camera primary mirror 5 and camera secondary mirror 6, first reference laser beam 2 arrives primary importance detector 8, second reference laser beam 3 and arrives second place detector 9.
It should be noted that, although the optical unit of the first reference laser beam 2 and the second reference laser beam 3 processes is than imaging more than 23 prism of corner cube 4 of the target that is taken, but, because prism of corner cube 4 has a kind of special optical property, no matter namely incident light is incident from which angle, emergent light all can keep parallel with incident light, therefore, the shake of prism of corner cube 4 can not change the direction of propagation of light, thus can think that the first reference laser beam 2 and the second reference laser beam 3 have passed through identical optical unit with imaging 23.
Primary importance detector 8 is mainly used in the facula position information of measurement first reference laser beam 2.Second place detector 9 is mainly used in the facula position information of measurement second reference laser beam 3.
The facula position information that the present embodiment utilizes primary importance detector 8 and second place detector 9 to measure can obtain the changes in deflection that space optical camera optical axis occurs about Inertial Measurement Unit coordinate system x-axis, y-axis and z-axis in each sampling instant, that is, the misalignment that the aggregate jitter situation of the inner multiple optical unit of space optical camera can produce on position sensor by reference to the hot spot of laser beam obtains.
Primary importance detector 8 in the present embodiment and second place detector 9 should have higher positional accuracy measurement, faster response speed, lower measurement noises and the higher linearity, as primary importance detector 8 and second place detector 9 can adopt sector, PSD (phasesensitivedetector, sensitive phase detector) or the device such as high-speed CCD (Charge-coupledDevice, charge coupled cell) realize.
XY superposition unit 15 to be mainly used according to above-mentioned facula position information and the hot spot target position information determination space optical camera optical axis that presets in each sampling instant about the deflection angle of Inertial Measurement Unit coordinate system x-axis and space optical camera optical axis in the deflection angle of each sampling instant about Inertial Measurement Unit coordinate system y-axis, and for each sampling instant, according to corresponding space optical camera optical axis this sampling instant about Inertial Measurement Unit coordinate system x-axis deflection angle and the corresponding sensing angle about inertia space reference system x-axis superpose and with superposing of the corresponding sensing angle about inertia space reference system y-axis, corresponding space optical camera optical axis determines that space optical camera optical axis is at the directional information of each sampling instant about the x-axis of inertia space reference system and the directional information of y-axis about the deflection angle of Inertial Measurement Unit coordinate system y-axis in this sampling instant.X and the y direction optical axis that above-mentioned space optical camera optical axis is in Fig. 4 about the directional information of the x-axis of inertia space reference system and the directional information of y-axis in each sampling instant points to measurement result 16.
Concrete, as shown in Figure 3, setting A
0represent the central point 24, A of primary importance detector 8 (i.e. primary importance detector)
krepresent a certain sampling instant T in section integral time
ktime the first reference laser beam the location point 25, B of hot spot on primary importance detector 8
0represent the central point 26, B of second place detector 9 (i.e. second place detector)
krepresent the sampling instant T in section integral time
ktime the second reference laser beam the location point 27 of hot spot on second place detector 9; The positional information of location point 25 and the positional information of location point 27 are the first reference laser beam and the second reference laser beam a certain sampling instant T in section integral time
kfacula position information on point visual field of camera focal plane.
Under these conditions, obtain space optical camera optical axis integral time section each sampling instant as follows about three kinds of implementations of the directional information of the x-axis of inertia space reference system and the directional information of y-axis:
The first implementation: at each sampling instant T of section integral time
k, the Inertial Measurement Unit coordinate system Z axis that inertial sensor 30 measures is α about the sensing angle of inertia space reference system x-axis
kand be β about the sensing angle of inertia space reference system y-axis
k; Arrive the process of primary importance detector 8 in the first reference laser beam 2 from the first lasing light emitter, receive the impact of camera internal optical unit shake and there occurs deflection, the facula position information acquisition amount of deflection of each sampling instant that XY superposition unit 15 can detect according to central point 24 and primary importance detector 8, if XY superposition unit 15 is by detecting A
0to A
kbetween distance in the X-axis direction and distance in the Y-axis direction can obtain, this amount of deflection is denoted as | A
0a
k| x and | A
0a
k| y, due to | A
0a
k| x and | A
0a
k| y is all displacements of the lines, inconvenient and sensing angle α
kwith sensing angle β
ksuperpose, therefore, XY superposition unit 15 can be incited somebody to action according to the configuration parameter of space optical camera | A
0a
k| x is converted into angle [alpha]
k' (angular displacement), and will | A
0a
k| y is converted into angle beta
k' (angular displacement), afterwards, XY superposition unit 15 is by above-mentioned sensing angle α
kwith above-mentioned angle [alpha]
k' superimposedly can to obtain at sampling instant T
kabout the sensing angle of x-axis, by above-mentioned sensing angle β
kwith above-mentioned angle beta
k' superimposed sensing the angle that can obtain about y-axis; The above-mentioned sensing angle about x-axis represents space optical camera optical axis at sampling instant T
kabout the directional information of the x-axis of inertia space reference system, the sensing angle about y-axis represents space optical camera optical axis at sampling instant T
kabout the directional information of the y-axis of inertia space reference system.
The second implementation: at each sampling instant T of section integral time
k, the Inertial Measurement Unit coordinate system Z axis that inertial sensor 30 measures is α about the sensing angle of inertia space reference system x-axis
kand be β about the sensing angle of inertia space reference system y-axis
k; Arrive the process of second place detector 9 in the second reference laser beam 3 from the second lasing light emitter, receive the impact of camera internal optical unit shake and there occurs deflection, the facula position information acquisition amount of deflection that XY superposition unit 15 can detect according to central point 26 and second place detector 9, if XY superposition unit 15 is by detecting B
0to B
kbetween distance in the X-axis direction and distance in the Y-axis direction can obtain, this amount of deflection is denoted as | B
0b
k| x and | B
0b
k| y, due to | B
0b
k| x and | B
0b
k| y is all displacements of the lines, inconvenient and sensing angle α
kwith sensing angle β
ksuperpose, therefore, XY superposition unit 15 can be incited somebody to action according to the configuration parameter of space optical camera | B
0b
k| x is converted into angle [alpha]
k' (angular displacement), and will | B
0b
k| y is converted into angle beta
k' (angular displacement), afterwards, XY superposition unit 15 is by above-mentioned sensing angle α
kwith above-mentioned angle [alpha]
k' superimposedly can to obtain at sampling instant T
kabout the sensing angle of x-axis, by above-mentioned sensing angle β
kwith above-mentioned angle beta
k' superimposedly can to obtain at sampling instant T
kabout the sensing angle of y-axis; The above-mentioned sensing angle about x-axis represents space optical camera optical axis at sampling instant T
kabout the directional information of the x-axis of inertia space reference system, the sensing angle about y-axis represents space optical camera optical axis at sampling instant T
kabout the directional information of the y-axis of inertia space reference system.
The third implementation: at each sampling instant T of section integral time
k, the Inertial Measurement Unit coordinate system Z axis that inertial sensor 30 measures is α about the sensing angle of inertia space reference system x-axis and is β about the sensing angle of inertia space reference system y-axis; Arrive the process of primary importance detector 8 in the first reference laser beam 2 from the first lasing light emitter, receive the impact of camera internal optical unit shake and there occurs deflection, same, arrive the process of second place detector 9 from the second lasing light emitter in the second reference laser beam 3, also receive the impact of camera internal optical unit shake and there occurs deflection; The facula position information acquisition that XY superposition unit 15 can detect according to central point 24 and primary importance detector 8 is at sampling instant T
kamount of deflection, if XY superposition unit 15 is by detecting A
0to A
kbetween distance in the X-axis direction and distance in the Y-axis direction can obtain, this amount of deflection can be denoted as | A
0a
k| x and | A
0a
k| y; Meanwhile, the XY superposition unit 15 facula position information acquisition that can detect according to central point 26 and second place detector 9 is at sampling instant T
kanother amount of deflection, if XY superposition unit 15 is by detecting B
0to B
kbetween distance in the X-axis direction and distance in the Y-axis direction can obtain, this amount of deflection is denoted as | B
0b
k| x and | B
0b
k| y, due to | A
0a
k| x, | A
0a
k| y, | B
0b
k| x and | B
0b
k| y is all displacements of the lines, inconvenient and sensing angle α
kwith sensing angle β
ksuperpose respectively, therefore, XY superposition unit 15 can be incited somebody to action according to the configuration parameter of space optical camera | A
0a
k| x is converted into angle [alpha]
k1 ' (angular displacement), and will | A
0a
k| y is converted into angle beta
k1 ' (angular displacement), will | B
0b
k| x is converted into angle [alpha]
k2 ' (angular displacement), then incite somebody to action | B
0b
k| y is converted into angle beta
k2 ' (angular displacement); Afterwards, XY superposition unit 15 is by above-mentioned sensing angle α
kwith above-mentioned angle [alpha]
k1 ' is superimposed, will point to angle α
kwith above-mentioned angle [alpha]
k2 ' is superimposed, and the average of angle calculated after these two superpositions can obtain the sensing angle about x-axis, meanwhile, by above-mentioned sensing angle β
kwith above-mentioned angle beta
k1 ' is superimposed, and will point to angle β
kwith above-mentioned angle beta
k2 ' is superimposed, and the average calculating the angle after these two superpositions can obtain at sampling instant T
kabout the sensing angle of y-axis; The above-mentioned sensing angle about x-axis represents space optical camera optical axis at sampling instant T
kabout the directional information of the x-axis of inertia space reference system, the sensing angle about y-axis represents space optical camera optical axis at sampling instant T
kabout the directional information of the y-axis of inertia space reference system.
It should be noted that, different space optical cameras has the transformational relation of different displacements of the lines to angular displacement due to the difference of design objective, such as, it is 9 μm in the single pixel dimension of the CCD of space optical camera, and the field angle of correspondence is when being 0.7 μ rad, proportionate relationship is between the two 9/0.7 ≈ 12.8571; Because primary importance detector 8 and second place detector 9 are arranged at point field positions place of camera focal plane 7, then when displacement of the lines is converted to angular displacement, can change according to X ≈ 12.8571 β approx, and error can carry out corresponding correction according to different space optical camera structures, wherein, X is displacement of the lines, and β is angular displacement.
The quadrilateral determination space optical camera optical axis that Z arithmetic element is mainly used in being formed according to two facula position information and the hot spot target position information that presets is in the deflection angle of each sampling instant about Inertial Measurement Unit coordinate system z-axis, and according to Inertial Measurement Unit coordinate system Z axis integral time section each sampling instant determine that space optical camera optical axis is at the directional information of each sampling instant about the z-axis of inertia space reference system about the sensing angle of inertia space reference system z-axis with superposing of the described deflection angle about Inertial Measurement Unit coordinate system z-axis, Z-direction optical axis namely in Fig. 4 points to measurement result 20.
Concrete, under condition as shown in Figure 3, obtaining space optical camera optical axis in each sampling instant about the implementation of the directional information of the z-axis of inertia space reference system is: at each sampling instant T of section integral time
k, the sensing angle about inertia space reference system z-axis that inertial sensor 30 measures is γ
k; Arrive the process of primary importance detector 8 in the first reference laser beam 2 from the first lasing light emitter, receive the impact of camera internal optical unit shake and there occurs deflection, arrive the process of second place detector 9 in the second reference laser beam 3 from the second lasing light emitter, receive the impact of camera internal optical unit shake and there occurs deflection, the facula position information acquisition amount of deflection that the facula position information that Z arithmetic element can detect according to central point 24 and primary importance detector 8 and central point 26 and second place detector 9 detect; As an A
0, some A
k, some B
0and some B
kthese four points form quadrilateral A
0a
kb
kb
0, length of side arithmetic element 18 calculates quadrilateral A
0a
kb
kb
0the length of side on four limits, namely | A
0a
k|, | A
kb
k|, | B
kb
0| and | A
0b
0|, Z superposition unit 19 utilizes the length of side of this quadrilateral (namely utilizing the geometric relationship on each limit) just can calculate angle γ in Fig. 3
k', this angle γ
k' be sampling instant T
kz deflection angle.Z superposition unit 19 can utilize multiple computing method to obtain angle γ by the length of side
k', Z superposition unit 19 couples of γ
kand γ
k' carry out superposition can obtain space optical camera optical axis at sampling instant T
kabout the directional information of the z-axis of inertia space reference system.
Jitter Calculation module is mainly used according to space optical camera optical axis in the shake of each sampling instant about the directional information computer memory optical camera optical axis of the directional information of the x-axis of inertia space reference system, the directional information of y-axis and z-axis.
A concrete example, the space optical camera optical axis that the space optical camera optical axis that each sampling instant obtains by Jitter Calculation module obtains with integration initial time respectively about the directional information of the directional information of the x-axis of inertia space reference system, the directional information of y-axis and z-axis carries out difference operation about the directional information of the directional information of the x-axis of inertia space reference system, the directional information of y-axis and z-axis, and Jitter Calculation module can obtain the amount of jitter of space optical camera optical axis on xyz tri-directions of each sampling instant.
Concrete, if Jitter Calculation module using sampling instant as horizontal ordinate, and using space optical camera optical axis about the amount of jitter (as angle value) of a certain axle as ordinate, then in an integral time section, space optical camera optical axis can form a curve or broken line or straight line in each sampling instant about the amount of jitter of a certain axle, Jitter Calculation module utilize this curve or broken line or straight line just can determine space optical camera optical axis is in each sampling instant shake in the corresponding direction.
This algorithm provided and display intrinsic not relevant to any certain computer, virtual system or miscellaneous equipment.Various general-purpose system also can with use based on together with this teaching.According to description above, the structure constructed required by this type systematic is apparent.In addition, the present invention is not also for any certain programmed language.It should be understood that and various programming language can be utilized to realize content of the present invention described here, and the description done language-specific is above to disclose preferred forms of the present invention.
In instructions provided herein, describe a large amount of detail.But can understand, embodiments of the invention can be put into practice when not having these details.In some instances, be not shown specifically known method, structure and technology, so that not fuzzy understanding of this description.
Similarly, be to be understood that, in order to simplify the disclosure and to help to understand in each inventive aspect one or more, in the description above to exemplary embodiment of the present invention, each feature of the present invention is grouped together in single embodiment, figure or the description to it sometimes.But, the method for the disclosure should be construed to the following intention of reflection: namely the present invention for required protection requires feature more more than the feature clearly recorded in each claim.Or rather, as claims below reflect, all features of disclosed single embodiment before inventive aspect is to be less than.Therefore, the claims following embodiment are incorporated to this embodiment thus clearly, and wherein each claim itself is as independent embodiment of the present invention.
Those skilled in the art are appreciated that and adaptively can change the module in the equipment in embodiment and they are arranged in one or more equipment different from this embodiment.Module in embodiment or unit or assembly can be combined into a module or unit or assembly, and multiple submodule or subelement or sub-component can be put them in addition.Except at least some in such feature and/or process or unit be mutually repel except, any combination can be adopted to combine all processes of all features disclosed in this instructions (comprising adjoint claim, summary and accompanying drawing) and so disclosed any method or equipment or unit.Unless expressly stated otherwise, each feature disclosed in this instructions (comprising adjoint claim, summary and accompanying drawing) can by providing identical, alternative features that is equivalent or similar object replaces.
In addition, those skilled in the art can understand, although embodiment described herein to comprise in other embodiment some included feature instead of further feature, the combination of the feature of different embodiment means and to be within scope of the present invention and to form different embodiments.Such as, in the following claims, the one of any of embodiment required for protection can use with arbitrary array mode.
All parts embodiment of the present invention with hardware implementing, or can realize with the software module run on one or more processor, or realizes with their combination.It will be understood by those of skill in the art that and microprocessor or digital signal processor (DSP) can be used in practice to realize according to the some or all functions of the embodiment of the present invention for some parts in the optical jitter measurement mechanism of space optical camera.
It should be noted, above-described embodiment is that the present invention will be described instead of limits the invention, and those skilled in the art can design alternative embodiment when not departing from the scope of claims.In the claims, any reference symbol between bracket should be configured to limitations on claims.Word " comprises " not to be got rid of existence and does not arrange element or step etc. in the claims.Word "a" or "an" before being positioned at element is not got rid of and be there is multiple such element.The present invention can by means of including the hardware of some different elements and realizing by means of the computing machine of suitably programming.In the unit claim listing some devices, several in these devices can be carry out imbody by same hardware branch.Word first, second and third-class use do not represent any order.Can be title by these word explanations.
Claims (10)
1., for an optical jitter measuring method for space optical camera, it is characterized in that, comprising:
Produce uneven first reference laser beam and the second reference laser beam mutually by the first lasing light emitter and the second lasing light emitter, and measure Inertial Measurement Unit coordinate system Z axis at the sensing angle of each sampling instant about inertia space reference system x-axis of section integral time, the sensing angle about inertia space reference system y-axis and the sensing angle about inertia space reference system z-axis;
Measure and enter the first reference laser beam of the optical unit of space optical camera and the second reference laser beam facula position information of each sampling instant in section integral time, and determine that space optical camera optical axis is at the directional information of each sampling instant about the directional information of the x-axis of inertia space reference system, the directional information of y-axis and z-axis according to the facula position information of described each sampling instant and three described sensing angles of each sampling instant;
According to space optical camera optical axis in the shake of each sampling instant about the directional information determination space optical camera optical axis of the directional information of the x-axis of inertia space reference system, the directional information of y-axis and z-axis.
2., for an optical jitter measuring method for space optical camera, it is characterized in that, comprising:
Uneven first reference laser beam and the second reference laser beam is mutually produced by the first lasing light emitter and the second lasing light emitter;
Measure Inertial Measurement Unit coordinate system z-axis at the sensing angle of each sampling instant about inertia space reference system x-axis of section integral time, the sensing angle about inertia space reference system y-axis and the sensing angle about inertia space reference system z-axis;
Described first reference laser beam and the second reference laser beam is made to enter the optical unit of camera and incide on point visual field of camera focal plane;
Measure the first reference laser beam and the second reference laser beam facula position information of each sampling instant on point visual field of camera focal plane in section integral time;
According to the facula position information of each sampling instant and the hot spot target position information determination space optical camera optical axis that presets in each sampling instant about the deflection angle of Inertial Measurement Unit coordinate system x-axis and space optical camera optical axis in the deflection angle of each sampling instant about Inertial Measurement Unit coordinate system y-axis;
According to described each sampling instant about Inertial Measurement Unit coordinate system x-axis deflection angle and the sensing angle about inertia space reference system x-axis superpose and with superposing of the sensing angle about inertia space reference system y-axis, deflection angle about Inertial Measurement Unit coordinate system y-axis determines that space optical camera optical axis is at the directional information of each sampling instant about the x-axis of inertia space reference system and the directional information of y-axis;
With superposing of the described deflection angle about Inertial Measurement Unit coordinate system z-axis, the quadrilateral determination space optical camera optical axis formed according to two facula position information of each sampling instant and two hot spot target position informations presetting in the deflection angle of each sampling instant about Inertial Measurement Unit coordinate system z-axis, and determines that space optical camera optical axis is at the directional information of each sampling instant about the z-axis of inertia space reference system about the sensing angle of inertia space reference system z-axis in each sampling instant according to Inertial Measurement Unit coordinate system z-axis;
According to space optical camera optical axis in the shake of each sampling instant about the directional information computer memory optical camera optical axis of the directional information of the x-axis of inertia space reference system, the directional information of y-axis and z-axis.
3. method as claimed in claim 2, wherein, described measurement Inertial Measurement Unit coordinate system z-axis integral time section the sensing angle of each sampling instant about inertia space reference system x-axis, the sensing angle about inertia space reference system y-axis and comprise about the sensing angle of inertia space reference system z-axis:
Inertial Measurement Unit measures Inertial Measurement Unit coordinate system z-axis at the sensing angle of each sampling instant about inertia space reference system x-axis of section integral time, the sensing angle about inertia space reference system y-axis and the sensing angle about inertia space reference system z-axis based on its measuring basis three-dimensional system of coordinate;
Wherein, described measuring basis three-dimensional system of coordinate is by star sensor calibration in-orbit.
4. method as claimed in claim 2, wherein, described in make described first reference laser beam and the second reference laser beam enter the optical unit of camera and point visual field inciding camera focal plane comprises:
Prism of corner cube is utilized to make described first reference laser beam and the second reference laser beam incide on camera primary mirror, and incide on camera secondary mirror via camera primary mirror, and incide with camera focal plane on rigidly connected primary importance detector and second place detector via camera secondary mirror.
5. method as claimed in claim 2, wherein, the described facula position information according to each sampling instant and the hot spot target position information determination space optical camera optical axis that presets comprise in the deflection angle of each sampling instant about Inertial Measurement Unit coordinate system y-axis about the deflection angle of Inertial Measurement Unit coordinate system x-axis and space optical camera optical axis in each sampling instant:
According to the facula position information of each sampling instant first reference laser beam and the hot spot target position information determination space optical camera optical axis of the first reference laser beam that presets in each sampling instant about the deflection angle of Inertial Measurement Unit coordinate system x-axis and space optical camera optical axis in the deflection angle of each sampling instant about Inertial Measurement Unit coordinate system y-axis; Or
According to the facula position information of each sampling instant second reference laser beam and the hot spot target position information determination space optical camera optical axis of the second reference laser beam that presets in each sampling instant about the deflection angle of Inertial Measurement Unit coordinate system x-axis and space optical camera optical axis in the deflection angle of each sampling instant about Inertial Measurement Unit coordinate system y-axis.
6. method as claimed in claim 2, wherein, the described quadrilateral determination space optical camera optical axis formed according to two facula position information and two hot spot target position informations presetting comprises in the deflection angle of each sampling instant about Inertial Measurement Unit coordinate system z-axis:
Calculate each limit length of side of described quadrilateral, and utilize described each limit length of side to calculate space optical camera optical axis in the deflection angle of each sampling instant about Inertial Measurement Unit coordinate system z-axis.
7. for an optical jitter measurement mechanism for space optical camera, it is characterized in that, described device comprises: inertial reference laser cell, prism of corner cube, primary importance detector, second place detector, XY superposition unit and Z arithmetic element;
Inertial reference laser cell, for producing uneven first reference laser beam and the second reference laser beam mutually by the first lasing light emitter and the second lasing light emitter, and measure Inertial Measurement Unit coordinate system z-axis at the sensing angle of each sampling instant about inertia space reference system x-axis of section integral time, the sensing angle about inertia space reference system y-axis and the sensing angle about inertia space reference system z-axis;
Prism of corner cube, is arranged in the light path of the first reference laser beam and the second reference laser beam, enters the optical unit of camera for making described first reference laser beam and the second reference laser beam and incides point visual field of camera focal plane;
Primary importance detector, is arranged on point visual field of camera focal plane, and is rigidly connected with camera focal plane, for measuring each sampling instant facula position information on point visual field of camera focal plane of the first reference laser beam in section described integral time;
Second place detector, is arranged on point visual field of camera focal plane, and is rigidly connected with camera focal plane, for measuring each sampling instant facula position information on point visual field of camera focal plane of the second reference laser beam in section described integral time;
XY superposition unit, for according to described facula position information and the hot spot target position information determination space optical camera optical axis that presets in each sampling instant about the deflection angle of Inertial Measurement Unit coordinate system x-axis and space optical camera optical axis in the deflection angle of each sampling instant about Inertial Measurement Unit coordinate system y-axis, and according to the described deflection angle about Inertial Measurement Unit coordinate system x-axis and the sensing angle about inertia space reference system x-axis superpose and with superposing of the sensing angle about inertia space reference system y-axis, deflection angle about Inertial Measurement Unit coordinate system y-axis determines that space optical camera optical axis is at the directional information of each sampling instant about the x-axis of inertia space reference system and the directional information of y-axis,
Z arithmetic element, for the quadrilateral determination space optical camera optical axis that formed according to two facula position information and two hot spot target position informations presetting in the deflection angle of each sampling instant about Inertial Measurement Unit coordinate system z-axis, and determine that space optical camera optical axis at each sampling instant directional information about the z-axis of inertia space reference system about the sensing angle of inertia space reference system z-axis with superposing of the described deflection angle about Inertial Measurement Unit coordinate system z-axis in each sampling instant according to Inertial Measurement Unit coordinate system z-axis;
Jitter Calculation module, for according to space optical camera optical axis in the shake of each sampling instant about the directional information computer memory optical camera optical axis of the directional information of the x-axis of inertia space reference system, the directional information of y-axis and z-axis.
8. device as claimed in claim 7, wherein, described inertial reference laser cell comprises:
Pedestal;
Two Laser output assemblies, are the first lasing light emitter and the second lasing light emitter, are rigidly connected with pedestal, for generation of uneven first reference laser beam and the second reference laser beam mutually;
Multiple inertial sensor, be rigidly connected with pedestal, for measuring Inertial Measurement Unit coordinate system z-axis at the sensing angle of each sampling instant about inertia space reference system x-axis of section integral time, the sensing angle about inertia space reference system y-axis and the sensing angle about inertia space reference system z-axis.
9. device as claimed in claim 8, wherein, described inertial sensor measures Inertial Measurement Unit coordinate system z-axis at the sensing angle of each sampling instant about inertia space reference system x-axis of section integral time, the sensing angle about inertia space reference system y-axis and the sensing angle about inertia space reference system z-axis based on the measuring basis three-dimensional system of coordinate in Inertial Measurement Unit;
And described Inertial Measurement Unit comprises: inertial reference laser cell, star sensor and calibration unit;
Calibration unit, carries out calibration in-orbit for utilizing star sensor to described measuring basis three-dimensional system of coordinate.
10. the device as described in claim 7 or 8 or 9, wherein, this Z arithmetic element comprises:
Length of side arithmetic element, for calculating each limit length of side of described quadrilateral;
Z superposition unit, for utilizing described each limit length of side to calculate space optical camera optical axis in the deflection angle of each sampling instant about Inertial Measurement Unit coordinate system z-axis, and determine that space optical camera optical axis at each sampling instant directional information about the z-axis of inertia space reference system about the sensing angle of inertia space reference system z-axis with superposing of the described deflection angle about Inertial Measurement Unit coordinate system z-axis in each sampling instant according to Inertial Measurement Unit coordinate system z-axis.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108614587A (en) * | 2018-06-14 | 2018-10-02 | 上海卫星工程研究所 | Satellite remote sensing instrument optical axis is directed toward in-orbit method of adjustment and system |
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| CN112461508A (en) * | 2020-10-27 | 2021-03-09 | 北京空间机电研究所 | Camera visual axis disturbance measuring equipment and method based on inertial reference unit |
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| CN109151461A (en) * | 2018-10-17 | 2019-01-04 | 孝感华中精密仪器有限公司 | A kind of test method of high-precision tracking camera focusing optical jitter amount |
| CN109709667A (en) * | 2019-02-27 | 2019-05-03 | 中国科学院光电技术研究所 | A kind of separate type pyramid for adjusting mirror based on electricity |
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| CN112799195A (en) * | 2020-12-31 | 2021-05-14 | 武汉中和海洋光讯有限公司 | Inertial stability reference light device of high-bandwidth built-in inertial measurement unit |
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