CN103134664A - In-orbit optical satellite camera modulation transfer function (MTF) measuring method based on convex reflector - Google Patents
In-orbit optical satellite camera modulation transfer function (MTF) measuring method based on convex reflector Download PDFInfo
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- CN103134664A CN103134664A CN2013100608455A CN201310060845A CN103134664A CN 103134664 A CN103134664 A CN 103134664A CN 2013100608455 A CN2013100608455 A CN 2013100608455A CN 201310060845 A CN201310060845 A CN 201310060845A CN 103134664 A CN103134664 A CN 103134664A
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Abstract
The invention discloses an in-orbit modulation transfer function (MTF) measuring method based on a convex reflector. An in-orbit MTF measuring device is mainly composed of a convex reflector array, a matched triangular support and a motor-driven theodolite with a built-in global position system (GPS) and software for calculation. Azimuth angles and zenith angles of the sun and a satellite are calibrated on the motor-driven theodolite. The motor-driven theodolite drives the convex reflector to automatically operate to an appointed position at a preset time. The sunlight at the preset time is reflected to the position where the satellite passes. The convex reflector is controlled by an automatic tracking system and enables the sunlight at the preset time to be reflected to an optical satellite camera to form an image. The image is synchronously returned to the ground, processed and calculated. Therefore, detection of the optical satellite camera MTF is completed. The in-orbit MTF measuring device is simple in structure, miniaturized, light in weight, simple in operation, suitable for filed work, capable of being used in detection of the optical satellite camera in-orbit MTF and free of the requirement for parameters such as gain and a radiation response degree of the optical satellite camera, and has wide practicability.
Description
Technical field
The present invention relates to the optical satellite camera at the rail detection 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 has reflected two key properties of optical satellite camera, namely become resolution and the contrast of image, it is to estimate at present optical satellite camera spatial character parameter preferably, optical satellite camera imaging system MTF is optical system, electronic system, the CCD device, the overall target of the modulation transfer function of each processes such as satellite motion and ground scenery target, by the optical satellite camera is detected at rail MTF, not only can estimate its image quality, and can be used for the image recovery by effective value MTF, determining and high-resolution image information acquisition of ground resolution, at present, detect at rail optical satellite camera MTF the sword limit method that mainly contains, impulse method, the several different methods such as point source method, its Point Source method can be obtained the two-dimensional points spread function of illness that has not attacked the vital organs of the human body imaging system spatial character, become one of main method that the optical satellite camera detects at rail MTF, compare impulse method, sword limit method, the point source method need not 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 in order to make up the defective of prior art, provide a kind of based on convex reflecting mirror in rail optical satellite camera MTF measuring method.
The present invention is achieved by the following technical solutions:
Based on convex reflecting mirror in rail optical satellite camera MTF measuring method, its device includes and is arranged at ground sunshine reflecting system, described sunshine reflecting system comprises the convex reflecting mirror array that is intervally arranged, the supporting tripod that is provided with, be installed with the electronic transit that is built-in with GPS and software for calculation on tripod, convex reflecting mirror is fixedly mounted on above electronic transit, the supporting data recorder that is connected with of electronic transit, described convex reflecting mirror edge one side is equipped with the sun viewing device, and concrete implementation step is as follows:
(1) to the calibration of the sun: see through the viewport of the sun viewing device on each convex reflecting mirror, adjust each convex lens positions, make their minute surface centre normal consistent with sunray, take off the sun viewing device after completing; 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, zenith angle, the position angle in overhead, city) at operation handbook input Satellite Camera to be measured place;
(3) built-in GPS and the software for calculation of each electronic transit measured position of sun automatically, and Calculation of Satellite is through position angle and the angle of pitch of overhead, city moment convex reflecting mirror, drive the convex reflecting mirror automatic rotation to suitable angle at each electronic transit of this predetermined instant, reflex on optical satellite camera on satellite so incide the sunshine of convex reflecting mirror array, complete imaging.
(4) after imaging, image is sent back to ground and detects analysis, completes the detection of optical satellite camera MTF.
GPS and the software for calculation that described electronic transit is built-in 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.
Receive the requirement of appropriate light flux according to the optical satellite camera, solar illumination ideal lambert earth surface reflection is complementary to the energy of Satellite Camera entrance pupil in energy that convex reflecting mirror reflection arrives the Satellite Camera entrance pupil and ground sampling interval, the luminous flux that this moment, the optical satellite camera received is high-end near camera dynamic range, has maximum signal to noise ratio (S/N ratio).For adapting to the demand that detects at rail two dimension PSF/MTF, make as far as possible the convex reflecting mirror device want miniaturization, lightweight, be suitable for field operation.Consider the impact that the convex reflecting mirror of ground sampling interval (GSD), ground object target, the pointolite of orbit prediction precision and beam-pointing error, optical satellite camera should have the factors such as certain beam divergence angle and field work, reasonably design, processing convex reflecting mirror also are installed on this device.
Detect principle:
According to optical principle and Fourier optics as can be known, for the linear displacement invariant system, the imaging relations of optical satellite camera can be expressed as:
Wherein,
Output image,
Observed object, "
" be the convolution algorithm symbol,
It is the point spread function of imaging system.
Swash when washing source (as convex reflecting mirror) off when being input as a little, according to convolution theorem, the imaging relations of this system can be abbreviated as:
（2）
At this moment, the output of system shows as the some diffusion property of itself, and the system point spread function that detection obtains is made Fourier transform and delivery, can characterize the two-dimensional modulation transport function of this optical satellite camera spatial character.
Along with improving constantly of optical satellite camera spatial resolution, utilize GPS (RTK) measuring system can be in the comparatively desirable point target of surface deployment, the two-dimensional space characteristic of its imaging system of direct-detection.By the reflection of light law as can be known, convex reflecting mirror can be dispersed certain angle with the sunshine that is similar to parallel incident, makes the optical satellite camera can be to its imaging in a big way.Take convex reflecting mirror as pointolite, can directly carry out detecting at rail to parameters such as PSF/MTF.
Advantage of the present invention is:
The parameters such as the gain of light requirement Satellite Camera camera, radiometric response degree, do not have practicality widely.Detect the MTF detection method it is simple in structure at rail for convex reflecting mirror of the present invention, miniaturization, lightweight, easy and simple to handle, be suitable for field work.
Description of drawings
Accompanying drawing 1 is apparatus structure schematic diagram of the present invention.
Accompanying drawing 2 is detection schematic diagram of the present invention.
Embodiment
As shown in Figure 1, based on convex reflecting mirror in rail optical satellite camera MTF measuring method, include and be arranged at ground sunshine reflecting system, described sunshine reflecting system comprises the 5*5 convex reflecting mirror array that is intervally arranged, the supporting tripod 1 that is provided with, be installed with the electronic transit 2 that is built-in with GPS and software for calculation on tripod, convex reflecting mirror 3 is fixedly mounted on electronic transit 2 tops, the supporting data recorder that is connected with of electronic transit 2, described convex reflecting mirror edge one side is equipped with the sun viewing device, and concrete implementation step is as follows:
(1) to the calibration of the sun: see through the viewport of the sun viewing device on each convex reflecting mirror, adjust each convex lens positions, make their minute surface centre normal consistent with sunray, take off the sun viewing device after completing; 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, zenith angle, the position angle in overhead, city) at operation handbook input Satellite Camera to be measured place;
(3) built-in GPS and the software for calculation of each electronic transit measured position of sun automatically, and Calculation of Satellite is through position angle and the angle of pitch of overhead, city moment convex reflecting mirror, drive the convex reflecting mirror automatic rotation to suitable angle at each electronic transit of this predetermined instant, reflex on optical satellite camera on satellite so incide the sunshine of convex reflecting mirror array, complete imaging.
(4) after imaging, image is sent back to ground and detects analysis, completes the detection of optical satellite camera MTF.
Claims (1)
- Based on convex reflecting mirror in rail optical satellite camera MTF measuring method, it is characterized in that: include and be arranged at ground sunshine reflecting system, described sunshine reflecting system comprises the convex reflecting mirror array that is intervally arranged, the supporting tripod that is provided with, be installed with the electronic transit that is built-in with GPS and software for calculation on tripod, convex reflecting mirror is fixedly mounted on above electronic transit, the supporting data recorder that is connected with of electronic transit, described convex reflecting mirror edge one side is equipped with the sun viewing device, and concrete implementation step is as follows:(1) to the calibration of the sun: see through the viewport of the sun viewing device on each convex reflecting mirror, adjust each convex lens positions, make their minute surface centre normal consistent with sunray, take off the sun viewing device after completing; 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, zenith angle, the position angle in overhead, city) at operation handbook input Satellite Camera to be measured place;(3) built-in GPS and the software for calculation of each electronic transit measured position of sun automatically, and Calculation of Satellite is through position angle and the angle of pitch of overhead, city moment convex reflecting mirror, drive the convex reflecting mirror automatic rotation to suitable angle at each electronic transit of this predetermined instant, reflex on optical satellite camera on satellite so incide the sunshine of convex reflecting mirror array, complete imaging;(4) after imaging, image is sent back to ground and detects analysis, completes the detection of optical satellite camera MTF.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104298844A (en) * | 2014-05-23 | 2015-01-21 | 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 |
| 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 |
| CN107782279A (en) * | 2017-09-14 | 2018-03-09 | 中国科学院长春光学精密机械与物理研究所 | A kind of method of modulation transfer function of the testing photoelectronic theodolite at outfield |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104298844A (en) * | 2014-05-23 | 2015-01-21 | 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 |
| 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 |
| CN107782279A (en) * | 2017-09-14 | 2018-03-09 | 中国科学院长春光学精密机械与物理研究所 | A kind of method of modulation transfer function of the testing photoelectronic theodolite at outfield |
| 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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