Numerical simulation method for full link of aerospace tdi CCD camera
A numerical simulation, full-link technology, used in surveying, mapping and navigation, measuring devices, instruments, etc., can solve problems such as poor single-machine reusability, long debugging period, and difficulty in reflecting accurate projection relationships.
Inactive Publication Date: 2016-11-23
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
[0003] 1. The full physical simulation uses hardware to simulate the satellite's in-orbit imaging state, which has high cost and long debugging cycle;
[0004] 2. Most of the full-physics simulation platforms use plane targets to simulate ground scenes, or imaging targets with three-dimensional undulating terrain features, which are difficult to reflect the precise projection relationship between the positions of each point of the ground features and the points of the image plane, especially difficult to simulate The influence of the curvature of the earth on the geometric positioning and imaging distortion of optical remote sensors;
[0005] 3. Different types of sensors require different hardware devices, so the single-machine reusability is poor, resulting in waste of resources
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[0047] The present invention is characterized in that it adopts the numerical simulation technology route to carry out precise modeling on each link of the aerospace TDI CCD camera in-orbit imaging process, and the technical implementation method is as follows: figure 1 As shown, it is realized through the following steps:
[0048] Step 1: Create an observation scene including spectral attributes
[0049]The modeling of the observation scene is divided into two parts: geometry and radiation characteristics. First, the establishment of the geometric model adopts the organizational form of a triangulation digital elevation model (DEM). The triangulation DEM includes triangle vertex positions, vertex texture coordinates, vertex normal vectors, triangle vertex Indexed in the vertex array, the entire observation scene consists of a series of triangulated DEMs.
[0050] Secondly, the triangulation DEM and the spectrum attribute are associated through a unique ID. The data contained...
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The invention provides a full-link numerical simulation method of an aerospace TDICCD (Time Delay and Integration Charge Coupled Device) camera based on an in-orbit imaging physical mechanism, belongs to the technical field of photoelectronic imaging, and solves the technical problems of satellite full-link full-physical hardware simulation. The method provided by the invention comprises the following steps: step 1, establishing an observation scene containing a spectrum attribute; step 2, carrying out orbit modeling; step 3, carrying out posture modeling; step 4, modeling a camera optical system; step 5, carrying out star observation vector modeling; step 6, carrying out entrance pupil radiance field modeling on a target camera; step 7, carrying out camera radiation responding modeling; step 8, carrying out MFT (Modulation Transfer Function) degeneration simulation; step 9, carrying out noise adding and compression simulation. According to the full-link numerical simulation method, the simulation cost is saved; the influences on imaging, caused by errors introduced by a full-physical simulation platform, are eliminated; a projection relation between each point of sensor image surfaces at different imaging moments and a corresponding surface feature point is calculated; a problem of geometric distortion in an imaging process can be reflected; each module is provided with a reserved interface so as to conveniently carry out alteration upgrading according to actual scientific research requirements.
Description
technical field [0001] The invention relates to the technical field of photoelectric imaging, in particular to a full-link numerical simulation method of an aerospace TDICCD camera based on the physical mechanism of on-orbit imaging. Background technique [0002] With the wide application of satellite remote sensing images in various fields, the requirements for the imaging quality of aerospace TDI CCD cameras continue to increase. Considering the high cost of aerospace products, accurate ground simulation is particularly necessary. High-precision and high-resolution satellite imaging simulation can play a very important role in satellite technical index demonstration, experimental testing, on-orbit operation evaluation, and fault simulation analysis. At present, most of the satellite-to-ground imaging process simulations use ground-based full-physical imaging test methods: calculate the relative position and relative velocity relationship between the optical remote sensor ...
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IPC IPC(8): G01C11/00
CPCG01C11/00
Inventor金光杨飞曲宏松贺小军钟兴
OwnerCHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI