CN103134664B - A kind of camera of optical satellite in-orbit MTF measuring method based on convex reflecting mirror - Google Patents
A kind of camera of optical satellite in-orbit MTF measuring method based on convex reflecting mirror Download PDFInfo
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- CN103134664B CN103134664B CN201310060845.5A CN201310060845A CN103134664B CN 103134664 B CN103134664 B CN 103134664B CN 201310060845 A CN201310060845 A CN 201310060845A CN 103134664 B CN103134664 B CN 103134664B
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Abstract
The invention discloses a kind of detection method of MTF in-orbit realized based on convex reflecting mirror, this device is primarily of convex refractive lens array, supporting tripod, be built-in with the electronic transit composition of GPS and software for calculation, electronic transit is calibrated the position angle of the sun and satellite and zenith angle, electronic transit drives the time that convex reflecting mirror is being subscribed automatically to move to assigned address, the sunshine in regulation moment is reflexed to satellite institute through position, convex reflecting mirror is under the control of automatic tracking system, this moment sunshine is reflexed on optical satellite camera and makes its imaging, image synchronization is passed ground back and is carried out process calculating, so far the detection of optical satellite camera MTF is completed, structure of the present invention is simple, miniaturization, lightweight, easy and simple to handle, be suitable for field work, can be used for optical satellite camera In-flight measurement MTF and detect, without the need to the parameter such as gain, radiometric response degree of optical satellite camera, there is practicality widely.
Description
Technical field
The present invention relates to optical satellite camera In-flight measurement field, is the integrated evaluating method to optical satellite camera imaging mass of system.
Background technology
The modulation transfer function (MTF) of optical satellite camera is the important indicator of optical imaging system quality assessment, this function reflects two key properties of optical satellite camera, the i.e. resolution of become image and contrast, it evaluates the good parameter of optical satellite camera spatial character at present, the MTF of optical satellite camera imaging system is optical system, electronic system, CCD device, the overall target of the modulation transfer function of each processes such as satellite motion and ground scenery target, by to optical satellite camera in-orbit MTF detect, not only can evaluate its image quality, and may be used for Postprocessing technique by effective value MTF, the determination of ground resolution and high-resolution image information acquisition, at present, optical satellite camera MTF detects and mainly contains recognition status in-orbit, impulse method, the multiple methods such as point source method, its Point Source method can obtain the two-dimensional points spread function of illness that has not attacked the vital organs of the human body imaging system spatial character, become optical satellite camera one of the main method that detects of MTF in-orbit, compare impulse method, recognition status, point source method is without the need to the gain of optical satellite camera, the parameters such as radiometric response degree, fairly simple.
Summary of the invention
The object of the invention is exactly the defect in order to make up prior art, provides a kind of camera of optical satellite in-orbit MTF measuring method based on convex reflecting mirror.
The present invention is achieved by the following technical solutions:
Based on the camera of the optical satellite in-orbit MTF measuring method of convex reflecting mirror, its device includes and is arranged at ground sunshine reflecting system, described sunshine reflecting system comprises the convex refractive lens array be intervally arranged, supportingly be provided with tripod, tripod is installed with the electronic transit being built-in with GPS and software for calculation, convex reflecting mirror is fixedly mounted on above electronic transit, electronic transit is supporting is connected with data recorder, described side, convex reflecting mirror edge is provided with sun viewing device, and concrete implementation step is as follows:
(1) to the calibration of the sun: through the viewport of the sun viewing device on each convex reflecting mirror, adjust each convex lens position, make their minute surface centre normal consistent with sunray, after completing, take off sun viewing device; Key in " sun " by electronic transit operation handbook and follow the tracks of setting;
(2) satellite calibration: the satellite parametric reduction (satellite is through time in overhead, city, zenith angle, position angle) inputting Satellite Camera place to be measured at operation handbook;
(3) GPS that each electronic transit is built-in and software for calculation measure position of sun automatically, and calculate satellite through the position angle of overhead, city moment convex reflecting mirror and the angle of pitch, convex reflecting mirror is driven to be automatically rotated to suitable angle at each electronic transit of this predetermined instant, so the sunshine inciding convex refractive lens array reflexes on the optical satellite camera on satellite, complete imaging.
(4) after imaging image be sent back to ground carry out detection analyze, complete the detection of optical satellite camera MTF.
The GPS that described electronic transit is built-in and software for calculation can be used between the solar time, the automatic mensuration in place and convex reflecting mirror orientation and pitching anglec of rotation calculation and control.
The requirement of appropriate light flux is received according to optical satellite camera, in the energy and ground sampling interval of convex reflecting mirror reflection arrival Satellite Camera entrance pupil, the desirable lambert's earth surface reflection of solar illumination matches to the energy of Satellite Camera entrance pupil, now high-end close to camera dynamic range of luminous flux that receive of optical satellite camera, has maximum signal to noise ratio (S/N ratio).For adapting to the demand that two-dimentional PSF/MTF in-orbit detects, convex refractive lens device is made to want miniaturization, lightweight, be suitable for field operation as far as possible.Consider orbit prediction precision and beam-pointing error, the ground sampling interval (GSD) of optical satellite camera, ground object target, pointolite convex reflecting mirror should have the impact of the factors such as certain beam divergence angle and field work, reasonably design, processing convex reflecting mirror being installed on this device.
Cleaning Principle:
According to optical principle and Fourier optics, for linear displacement invariant system, the imaging relations of optical satellite camera can be expressed as:
（1）
Wherein,
output image,
observed object, "
" be convolution algorithm symbol,
it is the point spread function of imaging system.
When be input as a little swash wash source (as convex reflecting mirror) off time, according to convolution theorem, the imaging relations of this system can be abbreviated as:
（2）
Now, the output of system shows as the some diffusion property of itself, making Fourier transform and delivery, can characterize the two-dimensional modulation transport function of this optical satellite camera spatial character by detecting the system point spread function obtained.
Along with improving constantly of optical satellite camera spatial resolution, utilize GPS (RTK) measuring system can in the ideal point target of surface deployment, the two-dimensional space characteristic of its imaging system of direct-detection.From the reflection law of light, the sunshine of less parallel incidence can be dispersed certain angle by convex reflecting mirror, makes optical satellite camera can to its imaging in a big way.Take convex reflecting mirror as pointolite, directly can carry out In-flight measurement to parameters such as PSF/MTF.
Advantage of the present invention is:
The parameter such as gain, radiometric response degree of light requirement Satellite Camera camera, does not have practicality widely.Its structure of convex reflecting mirror In-flight measurement MTF detection method of the present invention is simple, miniaturization, lightweight, easy and simple to handle, be suitable for field work.
Accompanying drawing explanation
Accompanying drawing 1 is apparatus structure schematic diagram of the present invention.
Accompanying drawing 2 is Cleaning Principle figure of the present invention.
Embodiment
As shown in Figure 1, based on the camera of the optical satellite in-orbit MTF measuring method of convex reflecting mirror, include and be arranged at ground sunshine reflecting system, described sunshine reflecting system comprises the 5*5 convex refractive lens array be intervally arranged, supportingly be provided with tripod 1, tripod is installed with the electronic transit 2 being built-in with GPS and software for calculation, convex reflecting mirror 3 is fixedly mounted on above electronic transit 2, electronic transit 2 is supporting is connected with data recorder, described side, convex reflecting mirror edge is provided with sun viewing device, and concrete implementation step is as follows:
(1) to the calibration of the sun: through the viewport of the sun viewing device on each convex reflecting mirror, adjust each convex lens position, make their minute surface centre normal consistent with sunray, after completing, take off sun viewing device; Key in " sun " by electronic transit operation handbook and follow the tracks of setting;
(2) satellite calibration: the satellite parametric reduction (satellite is through time in overhead, city, zenith angle, position angle) inputting Satellite Camera place to be measured at operation handbook;
(3) GPS that each electronic transit is built-in and software for calculation measure position of sun automatically, and calculate satellite through the position angle of overhead, city moment convex reflecting mirror and the angle of pitch, convex reflecting mirror is driven to be automatically rotated to suitable angle at each electronic transit of this predetermined instant, so the sunshine inciding convex refractive lens array reflexes on the optical satellite camera on satellite, complete imaging.
(4) after imaging image be sent back to ground carry out detection analyze, complete the detection of optical satellite camera MTF.
Claims (1)
1. based on the camera of the optical satellite in-orbit MTF measuring method of convex reflecting mirror, it is characterized in that: include and be arranged at ground sunshine reflecting system, described sunshine reflecting system comprises the convex refractive lens array be intervally arranged, supportingly be provided with tripod, tripod is installed with the electronic transit being built-in with GPS and software for calculation, convex reflecting mirror is fixedly mounted on above electronic transit, electronic transit is supporting is connected with data recorder, described side, convex reflecting mirror edge is provided with sun viewing device, and concrete implementation step is as follows:
(1) to the calibration of the sun: through the viewport of the sun viewing device on each convex reflecting mirror, adjust each convex reflecting mirror position, make their minute surface centre normal consistent with sunray, after completing, take off sun viewing device; Key in " sun " by electronic transit operation handbook and follow the tracks of setting;
(2) satellite calibration: input the satellite parametric reduction at Satellite Camera place to be measured at operation handbook, satellite parametric reduction is satellite through time in overhead, city, zenith angle, position angle;
(3) GPS that each electronic transit is built-in and software for calculation measure position of sun automatically, and calculate satellite through the position angle of overhead, city moment convex reflecting mirror and the angle of pitch, convex reflecting mirror is driven to be automatically rotated to suitable angle at satellite through each electronic transit of overhead, city moment, so the sunshine inciding convex refractive lens array reflexes on the optical satellite camera on satellite, complete imaging;
(4) after imaging image be sent back to ground carry out detection analyze, complete the detection of optical satellite camera MTF.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103970993B (en) * | 2014-04-30 | 2017-07-25 | 中国科学院长春光学精密机械与物理研究所 | A kind of modulation transfer function measuring method for star loaded camera |
| CN104298844B (en) * | 2014-05-23 | 2017-04-12 | 中国科学院光电研究院 | Method for obtaining measurement precision of optical remote sensing load on-orbit modulation transfer function (MTF) measured through dot matrix method |
| CN106500590A (en) * | 2016-12-15 | 2017-03-15 | 宁夏共享模具有限公司 | A kind of laser interferometer interferoscope adjusts platform |
| CN107782279B (en) * | 2017-09-14 | 2019-09-10 | 中国科学院长春光学精密机械与物理研究所 | A kind of method of the modulation transfer function of testing photoelectronic theodolite at outfield |
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| JP2002122774A (en) * | 2000-10-16 | 2002-04-26 | Nec Corp | System and method for determing focal position |
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| EP0524043A1 (en) * | 1991-06-27 | 1993-01-20 | Centre National D'etudes Spatiales | Image processing and recording method and pick-up device for carrying out this method |
| CN101281250A (en) * | 2007-04-04 | 2008-10-08 | 南京理工大学 | Method for monitoring on-rail satellite remote sensor modulation transfer function based on image element |
| CN101980293A (en) * | 2010-09-02 | 2011-02-23 | 北京航空航天大学 | Method for detecting MTF of hyperspectral remote sensing system based on edge image |
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