tailieunhanh - Xác định giá trị hàm truyền điều biến (MTF) phục vụ đánh giá chất lượng ảnh vệ tinh VNREDSat-1, sử dụng bãi thử cố định

Bài viết sử dụng phương pháp cạnh nghiêng đối với bãi thử nhân tạo cố định và dữ liệu ảnh VNREDSat-1 có độ phân giải không gian kênh toàn sắc là 2,5 m để thực hiện ước tính giá trị MTF. | Journal of Mining and Earth Sciences Vol. 62 Issue 1 2021 19 - 26 19 Estimation of Modulation Transfer Function MTF of VNREDSat-1 satellite for image quality assessment by using the permanent test site Ngoc Minh Nguyen 1 2 Anh Van Tran 2 Tuan Van Nghiem 3 Huy Xuan Chu 1 Thao Phuong Thi Do 2 1 Space Technology Institute Vietnam Academy of Science and Technology Vietnam 2 Faculty of Geomatics and Land Administration Hanoi University of Mining and Geology Vietnam 3 Division of Science and International Relations Department of National Remote Sensing Vietnam ARTICLE INFO ABSTRACT Article history MTF is a factor in evaluating image quality with respect to the contrast Received 18th Sept. 2020 and sharpness of the payload thus directly related to spatial resolution. Accepted 09th Jan. 2021 Therefore ensuring image quality is an important task especially for Available online 28th Feb. 2021 small satellites with high spatial resolution. This study uses the slanted- Keywords edge method for the artificial permanent test site and VNREDSat-1 image Image quality data with spatial resolution of panchromatic band as m to make an MTF value estimate. The MTF value during 5 years of operation averages MTF about compared to the threshold as for the test site at Salon de Test site Provence France the MTF value ranged from in across-track VNREDSat-1. direction and in along-track direction and at the Buon Ma Thuot test site these values were and the reflectivity of these two test sites are similar proving that image quality is guaranteed throughout the design life of the satellite moreover they are also the basis for Vietnam to finalize regulations on validation and calibration of optical satellite systems in the future when we have own test site. Copyright 2021 Hanoi University of Mining and Geology. All rights reserved. _____________________ Corresponding author E - mail nmngoc@ DOI 1 .03 20 Tạp .