When some sub-images lack ground control points (GCPs) or GCPs are not evenly distributed, the estimated camera parameters are often deviated in in-orbit geometric calibration. In this study, a feasible in-orbit geometric calibration method for multi-linear array optical remote sensing satellites with tie constraints is presented. In the presented method, both GCPs and tie points are employed. With the help of tie constraints provided by tie points, all charge coupled devices (CCDs) are logically connected into a complete CCD. The internal camera parameters of all CCDs can then be simultaneously and precisely estimated, even if sufficient evenly distributed GCPs in some sub-images are unavailable. Three GaoFen-6 images and two ZiYuan3-02 images were tested. Compared with the conventional method, the experimental results showed that the deviations of the estimated camera parameters could be effectively eliminated by the presented method. The average geometric stitching accuracy of the adjacent sub-images of all the tested images were improved from approximately 0.5 pixel to 0.1 pixel. The geometric quality of the stitched images was thereby improved.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OE.464112 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Development of a space-compatible packaging system for an integrated monolithic ultra-stable optical reference.
Rev Sci Instrum
October 2024
MOE Key Laboratory of TianQin Mission, TianQin Research Center for Gravitational Physics and School of Physics and Astronomy, Frontiers Science Center for TianQin, Gravitational Wave Research Center of CNSA, Sun Yat-sen University (Zhuhai Campus), Zhuhai 519082, China.
We report the development of a space-compatible packaging system for an integrated monolithic ultra-stable optical reference toward China's next-generation geodesy mission with low orbit satellite-to-satellite tracking. Building on our previous work, we optimized the mounting structure and thermal insulation mechanism using the finite element method. The comprehensive simulation results demonstrated the robustness of the entire packaging system with enough margins to withstand severe launch loads and maintain an ultra-high geometric cavity length stability.
View Article and Find Full Text PDFA Comparative Analysis of Performance Simulation for PUI Detectors Based on Traditional Probability Model and the Vasyliunas and Siscoe Model.
Sensors (Basel)
September 2024
Key Laboratory of Electronics and Information Technology for Space System, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China.
Article Synopsis
- The interest in deep space missions has led to advancements in understanding space environments and the detection of pickup ions (PUIs).
- Simulation plays a key role in optimizing instrument performance for these missions, impacting how effectively they can operate in space.
- The study compares two models for generating PUIs during simulations, finding that while both models perform similarly in design, the Vasyliunas and Siscoe model is more effective for evaluating in-orbit performance, highlighting its importance for future exploration.
A Study on Structural Health Monitoring of a Large Space Antenna via Distributed Sensors and Deep Learning.
Sensors (Basel)
December 2022
Department of Information Engineering, Electronics and Telecommunications (DIET), Sapienza University of Rome, Via Eudossiana 18, 00184 Rome, Italy.
Most modern Earth and Universe observation spacecraft are now equipped with large lightweight and flexible structures, such as antennas, telescopes, and extendable elements. The trend of hosting more complex and bigger appendages, essential for high-precision scientific applications, made orbiting satellites more susceptible to performance loss or degradation due to structural damages. In this scenario, Structural Health Monitoring strategies can be used to evaluate the health status of satellite substructures.
View Article and Find Full Text PDFWhen some sub-images lack ground control points (GCPs) or GCPs are not evenly distributed, the estimated camera parameters are often deviated in in-orbit geometric calibration. In this study, a feasible in-orbit geometric calibration method for multi-linear array optical remote sensing satellites with tie constraints is presented. In the presented method, both GCPs and tie points are employed.
View Article and Find Full Text PDFSpace-based optical astronomical telescopes are susceptible to mirror misalignments due to space disturbance in mechanics and temperature. Therefore, it is of great importance to actively align the telescope in orbit to continuously maintain imaging quality. Traditional active alignment methods usually need additional delicate wavefront sensors and complicated operations (such as instrument calibration and pointing adjustment).
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!