Results 1 to 10 of about 5,395 (218)

High Precision Remote Sensing Payload Alignment Procedure Using Theodolite and Alignment Cube [PDF]

فصلنامه علوم و فناوری فضایی, 2023
In this paper, a step-by-step laboratory procedure for performing a satellite's payload’s alignment measurement is presented. Four highly accurate theodolites are used along with two or more alignment corner cube to accurately extract the final attitude.
Javad Haghshenas, Reza Sharifi Hafshejani   +1 more
doaj   +1 more source

Optimal Design of the Reflector Antenna to Improve Performance of C-Band Quad-Pol ScanSAR Systems [PDF]

Journal of Electromagnetic Engineering and Science, 2020
The performance of synthetic aperture radar (SAR) antenna determines the quality of images obtained from the spaceborne SAR system, and thus, SAR antenna should be designed to satisfy the target performance of SAR system.
Jung-Hwan Lim, Jae Wook Lee, Taek-Kyung Lee, Sang-Burm Ryu, Hyeon-Cheol Lee, Sang-Gyu Lee   +5 more
doaj   +1 more source

Performance Evaluation of a Modified SweepSAR Mode for Quad-Pol Application in SAR Systems [PDF]

Journal of Electromagnetic Engineering and Science, 2020
Efficient earth observation using spaceborne synthetic aperture radar (SAR) requires the analysis of high-resolution wide-swath (HRWS) systems, which have a fine resolution and a short revisit time through wide-area observation, and quadrature ...
Jung-Hwan Lim, Jae Wook Lee, Taek-Kyung Lee, Hyeon-Cheol Lee, Sang-Gyu Lee, Sang-Burm Ryu, Seong-Sik Yoon   +6 more
doaj   +1 more source

Erratum to “Performance Evaluation of a Modified SweepSAR Mode for Quad-Pol Application in SAR Systems” [PDF]

Journal of Electromagnetic Engineering and Science, 2020
In the paper entitled “Performance Evaluation of a Modified SweepSAR Mode for Quad-Pol Application in SAR Systems (Journal of Electromagnetic Engineering and Science, vol. 20, no. 3, pp. 199-206, 2020)”, the Acknowledgments has incorrect information. The
Jung-Hwan Lim, Jae Wook Lee, Taek-Kyung Lee, Hyeon-Cheol Lee, Sang-Gyu Lee, Sang-Burm Ryu, Seong-Sik Yoon   +6 more
doaj   +1 more source

A Modified SweepSAR Mode with Dual Channels for High Resolution and Wide Swath [PDF]

Journal of the Korean Institute of Electromagnetic Engineering and Science, 2018
In this study, an imaging mode of the modified SweepSAR is proposed with performance analysis for a high-resolution and wide swath coverage. To reduce the overall antenna size required for the solution of the azimuth ambiguity problem, different pulse ...
Seong Sik Yoon, Jae Wook Lee, Taek-Kyung Lee, Sang-burm Ryu, Hyeon-Cheol Lee, Sang Gyu Lee   +5 more
doaj   +1 more source

Dual-Band Direct Conversion Receiver With Additive Mixing Architecture

IEEE Access, 2022
A dual-band direct conversion receiver based on additive mixing architecture for low-cost and multi-mode wireless communication systems is proposed. The proposed receiver consists of two active four-port junctions for additive mixing and one-stage dual ...
Seong-Mo Moon, Han Lim Lee
doaj   +1 more source

First results of low frequency electromagnetic wave detector of TC-2/Double Star program [PDF]

Annales Geophysicae, 2005
LFEW is a low frequency electromagnetic wave detector mounted on TC-2, which can measure the magnetic fluctuation of low frequency electromagnetic waves. The frequency range is 8 Hz to 10 kHz.
J. B. Cao, Z. X. Liu, J. Y. Yang, J. Y. Yang, C. X. Yian, Z. G. Wang, X. H. Zhang, S. R. Wang, S. W. Chen, W. Bian, W. Dong, Z. G. Zhang, F. L. Hua, L. Zhou, N. Cornilleau-Wehrlin, B. de Laporte, M. Parrot, H. Alleyne, K. Yearby, O. Santolík, O. Santolík, C. Mazelle   +21 more
doaj   +1 more source

A Review of Unmanned Aerial Vehicle Low-Altitude Remote Sensing (UAV-LARS) Use in Agricultural Monitoring in China

Remote Sensing, 2021
Precision agriculture relies on the rapid acquisition and analysis of agricultural information. An emerging method of agricultural monitoring is unmanned aerial vehicle low-altitude remote sensing (UAV-LARS), which possesses significant advantages of ...
Haidong Zhang, Lingqing Wang, Ting Tian, Jianghai Yin   +3 more
doaj   +1 more source

A Secure Image Steganography Using Shark Smell Optimization and Edge Detection Technique

Kurdistan Journal of Applied Research, 2022
The stegangraphic system supply premium secrecy and ability of conserving the mystery information from gaining stalked or cracked. The suggested method consists of three phases which are edge detection, embedding and extraction.
Omar Y. Abdulhammed, Pshtiwan J. Karim, Dashne R. Arif, Twana S. Ali, Avin O. Abdalrahman, Arkan A. Saffer   +5 more
doaj   +1 more source

Parking packet payload with P4 [PDF]

Proceedings of the 16th International Conference on emerging Networking EXperiments and Technologies, 2020
Network Function (NF) deployments suffer from poor link goodput, because popular NFs such as firewalls process only packet headers while receiving and transmitting complete packets. As a result, unnecessary packet payloads needlessly consume link bandwidth.
Swati Goswami, Nodir Kodirov, Craig Mustard, Ivan Beschastnikh, Margo I. Seltzer   +4 more
openaire   +2 more sources