CN116222969A - Dynamic line frequency matching simulation device in TDI CCD large attitude angle push broom imaging process - Google Patents
Dynamic line frequency matching simulation device in TDI CCD large attitude angle push broom imaging process Download PDFInfo
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Abstract
The invention relates to a dynamic line frequency matching simulation device in a TDI CCD large attitude angle push broom imaging process, and belongs to the technical field of space optical remote sensing. The system comprises a focal plane, a high-frequency measuring table, an actuating mechanism controller, a high-frequency vibration curve, dynamic line frequency, a TDI CCD camera, a target image, a line frequency matching precision image source and a computer; according to the invention, through the micro-vibration testing platform provided with the on-orbit high-speed running executing mechanism, high-frequency micro-vibration generated when the aircraft flies on orbit is actually measured, and imaging disturbance of different amplitudes and frequencies of the executing mechanism to the high-resolution camera is simulated, the imaging influence of the on-satellite micro-vibration environment on the TDI CCD is obtained.
Description
Technical Field
The invention belongs to the technical field of space optical remote sensing, and particularly relates to a simulation device for dynamic line frequency accurate matching in a push-broom imaging process of a large attitude angle of a TDI CCD camera.
Background
At present, the TDI CCD imaging technology has been widely applied in the remote sensing field, and as the field of view and the spatial resolution are continuously improved, the number of TDI CCD splicing pieces and the number of single-chip pixels are continuously increased and improved, but a plurality of problems are brought at the same time. The large-view-field remote sensing camera is characterized by large-attitude-angle imaging, namely large-angle sideslip of the large-view-field remote sensing camera. The difference of image point image speed on the image plane caused by front and back swing is larger; the high satellite orbit makes the image speed and direction sensitive to the satellite attitude motion rate; the field curvature of the optical system causes optical distortion of the image. Non-frontal imaging. Geometrical distortion caused by the geometrical characteristics of the earth's inhomogeneous ellipsoids causes anisotropic distortions in the magnitude and direction of the image velocity. These factors will cause complex movements of the image points of the earth's scene on the image plane, and therefore dynamic imaging electronic image rate matching is required to obtain a clear remote sensing image.
In recent years, a plurality of domestic and foreign documents are about satellite attitude precision. The influence of the side swing and front and back swing imaging conditions on the image quality of the TDI CCD camera is analyzed in more detail, wherein the problems include distribution of an image speed field, matching of an image shift speed and the like, but the problem of influence of a line frequency matching method, a using condition and line frequency precision on a camera modulation transfer function MTF (modulation transfer function) under the condition of large attitude angle imaging of the large-view TDI CCD camera is seldom and deeply studied. The simulation device which is specially used for precisely matching dynamic line frequency in the large-attitude angle push broom imaging process of the satellite TDI CCD camera is lacking, and high-quality imaging of the large-view-field TDI CCD camera under various large-angle conditions cannot be realized.
Disclosure of Invention
The invention provides a high-precision line frequency matching method and a using condition thereof based on image speed field distribution and transfer function characteristics of large-attitude-angle imaging, so that line frequency matching precision meets the test problem of camera transfer function requirements, and provides a simulation device for dynamic line frequency precision matching in the process of large-attitude-angle push broom imaging of a TDI CCD camera.
The technical scheme adopted for solving the technical problems is as follows:
the simulation device for dynamic line frequency matching in the TDI CCD large attitude angle push broom imaging process comprises: the system comprises a focal plane, a high-frequency measuring table, an actuating mechanism controller, a high-frequency vibration curve, dynamic line frequency, a TDI CCD camera, a target image, a line frequency matching precision image source and a computer;
an analog device for precisely matching dynamic line frequency in the process of push-broom imaging of a TDI CCD camera with a large attitude angle, the working flow is shown in figure 1, which is characterized in that,
the calculation of the image movement speed of the side swing push-broom imaging is completed through the object-image relation in the side swing push-broom optical system;
based on the definition of the ground scene object and the pixels on the focal plane and the complete same of the side swing push-broom imaging, the front and back swing push-broom imaging image shift speed calculation is completed;
based on two image speed matching modes, finishing side-swinging push-broom imaging transfer function calculation;
fixing a TDI CCD camera, and measuring the requirement on line frequency matching precision;
the computer is connected with the imaging simulation source, and the computer collects the target image of the high-speed image shift and performs line frequency matching precision comparison analysis.
Preferably, in the simulation device, the actuator controller is connected with the actuator by a cable; the high-speed running executing mechanism is connected with the line frequency measuring table through a bearing, the measuring table is connected with the imaging simulation source after the high-speed line frequency and the curve are fused through a data transmission line, the TDI CCD camera is connected with the imaging simulation source after the line frequency and the curve are fused through a data transmission line, and the TDI CCD camera is connected with the imaging simulation source after the curve is fused through a data transmission line.
The beneficial effects of the invention are as follows: the invention provides a simulation device for precisely matching dynamic line frequency in a push-broom imaging process of a TDI CCD camera with a large attitude angle. The influence and the use condition of the transfer function of the same-speed matching and different-speed matching methods are elaborated in detail, on the premise of the given line frequency matching precision requirement, a high-precision line frequency matching method capable of supporting coarse adjustment and fine adjustment is provided, the precision of the line frequency matching method is analyzed, the given line frequency matching precision requirement is finally met, the line frequency precision reaches 0.999425 by the coarse adjustment method, the line frequency precision reaches 0.999928 by the fine adjustment method, and the transfer function MTF of the camera meets the requirement superior to that of 0.998, so that high-quality imaging of the large-view TDICCD camera under various large-angle conditions is realized.
Drawings
FIG. 1 shows a specific implementation structure of line frequency matching of a simulation device for dynamic line frequency accurate matching in a TDI CCD camera large attitude angle push broom imaging process;
FIG. 2 is an image rate matching mode;
FIG. 3 is a side sway imaging co-speed match;
FIG. 4 is a side sway imaging differential speed match;
fig. 5 is a relationship between line frequency matching error and transfer function.
Detailed Description
The invention will be described in further detail with reference to the drawings and examples.
As shown in FIG. 1, a system diagram of a simulation device for accurate matching of dynamic line frequency in a TDI CCD camera large attitude angle push broom imaging process is shown. A simulation device for dynamic line frequency accurate matching in a TDI CCD camera large attitude angle push broom imaging process comprises a focal plane. A high frequency measuring station. An actuator. And an actuator controller. A dither curve. Dynamic line frequency. TDI CCD camera. And (5) target image. And (5) matching the line frequency with a precision graph source. A computer; an analog device for precisely matching dynamic line frequency in the process of push-broom imaging of a TDI CCD camera with a large attitude angle, the working flow is shown in figure 1, which is characterized in that,
the calculation of the image movement speed of the side swing push-broom imaging is completed through the object-image relation in the side swing push-broom optical system;
based on the definition of the ground scene object and the pixels on the focal plane and the complete same of the side swing push-broom imaging, the front and back swing push-broom imaging image shift speed calculation is completed;
based on two image speed matching modes, finishing side-swinging push-broom imaging transfer function calculation;
fixing a TDI CCD camera, and measuring the requirement on line frequency matching precision;
the computer is connected with the imaging simulation source, and the computer collects the target image of the high-speed image shift and performs line frequency matching precision comparison analysis.
In the simulation device, an execution mechanism controller is connected with an execution mechanism by a cable; the high-speed running executing mechanism is connected with the line frequency measuring table through a bearing, the measuring table is connected with the imaging simulation source after the high-speed line frequency and the curve are fused through a data transmission line, the TDI CCD camera is connected with the imaging simulation source after the line frequency and the curve are fused through a data transmission line, and the TDI CCD camera is connected with the imaging simulation source after the curve is fused through a data transmission line.
The specific working principle is that in order to calculate the distribution of the image velocity field, a mathematical model of the image velocity of characteristic image points on the image plane of the large-field TDICCD camera needs to be established and calculated, wherein the characteristic image points comprise the center point and the edge point of each TDI CCD on the focal plane. The image shift speed analysis and calculation are respectively carried out under the condition of 2 types of camera side swing and front-back swing large-angle push broom imaging. And respectively calculating the image movement speed of the side swing push broom image. The push-broom imaging image shift speed is swung back and forth. On the theoretical basis that the higher the image shift speed matching precision is, the better the image quality is, but the matching of the image shift speed is realized by changing the CCD line frequency, and the accuracy of line frequency control directly influences the image quality, the higher the precision is, the better the image quality is, the influence of the line frequency matching precision on the transfer function and the numerical value corresponding relation between the line frequency matching precision and the transfer function are mainly analyzed, and a quick speed is found out. The high-efficiency line frequency matching method meets the requirement on line frequency matching precision under a certain transfer function index.
Specific examples are:
the same-speed matching image speed difference is set as shown in 2 (a), the image speed V4 of the center point of the focal plane center plate (4 th plate) is set as a reference point, and the image speed difference of each CCD image point is the speed difference between the center point of the CCD plate and the V4. The focal plane edge CCD has the largest image speed difference and the worst image transfer function. As shown in fig. 2 b, the differential speed matching image speed is set such that the image speed (V1 to V7) of each CCD center point of the focal plane is set as the reference point, and the image speed difference of the other image point of each CCD is the speed difference between the image point and the CCD center point (Vi, i=1 to 7). The image speed difference between the edge point of each CCD and the center point of the CCD is the largest, namely the image transfer function is the worst.
When the characteristic frequency f c Is equivalent to the Nyquist frequency f N MTF due to image shift rate residual:
wherein DeltaV=V m -V i (i＝1～7),ΔV/V m For image speed matching relative error, V in the same speed matching mode (see FIG. 3) m For the 4 th piece of center point image shift speed, deltaV is the image shift speed V of each piece of CCD center point i And V is equal to m Is the difference between (1); in the differential speed matching mode (see FIG. 4), V i For the image shift speed of each CCD center point, V m For the image shift speed of each CCD edge point, deltaV is the image shift speed V of each CCD center point i And V is equal to m Is a difference between (a) and (b).
MTF under two modes of same-speed matching and different-speed matching is calculated according to the above formula, and the MTF is calculated every 10 degrees in a range of 0-40 degrees of lateral swing, wherein the integration series M takes 32 stages, and the result is shown in figures 3 and 4.
Finding out the image rate matching error
Error of matching with line frequency->
The relation between the two can analyze the line frequency precision +.>
Influence on transfer MTF. From the relationship image shift a=v Electric fennel cutting movement X t, f=1/t, Δf=1/Δt, giving:
the relationship between the output frequency matching error and the transfer function MTF is obtained by combining the above equations, as shown in fig. 5. As seen from fig. 5, the smaller the line frequency matching error, the higher the control accuracy, the higher the camera transfer function, and the better the image quality. If the condition that the MTF line frequency mismatch is more than or equal to 0.95 is required to be met, the higher the line frequency precision requirement of each integration series is, the higher the required line frequency precision is, wherein the highest line frequency precision requirement is when the integration series is 96, and the line frequency precision is at least guaranteed to be better than 0.99634.
Claims (2)
- The simulation device for dynamic line frequency matching in the TDICCD large attitude angle push broom imaging process is characterized by comprising: the system comprises a focal plane, a high-frequency measuring table, an actuating mechanism controller, a high-frequency vibration curve, dynamic line frequency, a TDICCD camera, a target image, a line frequency matching precision image source and a computer; wherein,,the calculation of the image movement speed of the side swing push-broom imaging is completed through the object-image relation in the side swing push-broom optical system;based on the definition of the ground scene object and the pixels on the focal plane and the complete same of the side swing push-broom imaging, the front and back swing push-broom imaging image shift speed calculation is completed;based on two image speed matching modes, finishing side-swinging push-broom imaging transfer function calculation;fixing a TDICCD camera, and measuring the requirement on line frequency matching precision;the computer is connected with the imaging simulation source, and the computer collects the target image of the high-speed image shift and performs line frequency matching precision comparison analysis.
- 2. The simulation device for dynamic line frequency matching in the TDI CCD large attitude angle push broom imaging process according to claim 1, wherein an actuator controller and an actuator are connected by a cable; the high-speed running executing mechanism is connected with the line frequency measuring table through a bearing, the measuring table is connected with the imaging simulation source after the high-speed line frequency and the curve are fused through a data transmission line, the TDICCD camera is connected with the imaging simulation source after the line frequency and the curve are fused through a data transmission line, and the TDICCD camera is connected with the imaging simulation source after the curve is fused through a data transmission line.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117939117A (en) * | 2024-03-25 | 2024-04-26 | 长春长光睿视光电技术有限责任公司 | Dynamic resolution detection method of aviation camera with forward image motion compensation function |
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Patent Citations (5)
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| JP2003185531A (en) * | 2001-12-18 | 2003-07-03 | Olympus Optical Co Ltd | Apparatus for inspecting representation performance of camera lens |
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