Electronically de-spun phased array antenna for spinning spacecraft

Underwood, Harold R

doi:10.1109/aps.2001.959576

Cited by 2 publications

(4 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar solution with phased array antennas is presented by Underwood. 9 Concerning a spin-stabilized satellite Eu:CROPIS, the detailed analysis of destructive phenomena due to the dynamic far-field with amplitude and phase variations is presented by Drobczyk et al 10 And a dynamic link budget approach for the verification of the communication subsystem is presented by Drobczyk et al 11 These approaches elucidate the importance of considering the dynamic link aspects of the communication subsystem of the satellites.…”

mentioning

confidence: 99%

Effect of polarization on the link dynamics of a spinning low‐earth orbits satellite aligned with geomagnetic field

Talashila

Ramachandran

2021

Engineering Reports

View full text Add to dashboard Cite

This paper discusses the dynamic communication link aspects of IIT Madras student Satellite (IITMSAT). It is a Low-Earth Orbits satellite which has limited Attitude Determination and Control System (ADCS) ability to align one of its body axes with the geomagnetic field in orbit. The ADCS of IITMSAT has no control over its spin with respect to the axis along the geomagnetic field. This has a destructive influence on the link aspects between the satellite and the ground station. As the satellite spins over its axis, given the two-axis attitude control, the gain of the downlink antennas in the direction of the ground station vary all through the pass of the satellite over the ground station, which will, in turn, affect the signal received at the ground station. Similarly, the uplink is also affected. A rigorous analysis of the variation of the link strengths for uplink and downlink along typical passes of the satellite above a ground station located in Chennai, India, is presented, taking into account the geomagnetic field at the altitude of the orbit. This analysis helps in choosing the polarization (LHCP or RHCP) for uplink and stresses the need for polarization diversity at the ground station for downlink. This will ensure the link with the ground station remains robust through the pass of the satellite and hence achieving higher amounts of data transfer with the satellite. Further, this work helps design the satellite onboard antennas for better link performance, taking into account the ground station location and assisting in taking system-level decisions for small satellite missions. K E Y W O R D Santenna, communications, link margin, satellite INTRODUCTIONMicrosats and nanosats in Low-Earth Orbits (LEO) have ever-increasing importance as they can contribute significantly to remote sensing and earth observations, science missions, space weather, meteorology, astronomy, space debris, navigation, and telecommunications. The future large missions with small satellites will include electric and magnetic fieldThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

show abstract

mentioning

confidence: 99%

Effect of polarization on the link dynamics of a spinning low‐earth orbits satellite aligned with geomagnetic field

Talashila

Ramachandran

2021

Engineering Reports

View full text Add to dashboard Cite

show abstract

“…The proposed EDPA provides an alternative multi-panel electronically steerable antenna for data down-link, synchronized (in reverse) with the spin-rate of the satellite. 4 The EDPA is designed to operate near 8.45 GHz with enough gain for access on earth by a commercial satellite dish, rather than NASA's busy Deep Space Network (DSN). Thus, the EDPA enhances NASA's capability, associated with spinning satellite missions, for more easily accessible down-link data in the higher frequency, less-occupied, X-band.…”

Section: Project Assignment and Motivationmentioning

confidence: 99%

“…The HRUPA prototype, fabricated by Harris, consists of an array of circular microstrip patch antenna elements, each with a parasitic element to broaden its bandwidth. 5 4 , the following sections of this paper provide details of the technical methods and design choices to further illustrate the educational benefits of the overall SFP experience.…”

Section: Project Assignment and Motivationmentioning

confidence: 99%

See 1 more Smart Citation

Educational Benefits Of Antenna Design Experience On A Nasa/Asee Summer Fellowship Program

Underwood¹

2002 Annual Conference Proceedings

View full text Add to dashboard Cite

An engineering program at a liberal arts college can benefit students by allowing personal interaction with faculty and by including non-technical aspects of education needed in the working world. However, students and faculty from such teaching institutions may lack the equipment, techniques and experienced personnel employed by a larger research entity. The Summer Fellowship Program (SFP) provides the opportunity to form a type of temporary partnership. Under management of the American Society for Engineering Education (ASEE), the National Aeronautics and Space Administration (NASA) annually offers the SFP to full-time engineering and science educators in the United States, as an opportunity to participate in NASA's current research efforts. 1 Over the years, both NASA and participating faculty have benefitted from the SFP by realizing some of NASA's primary objectives for the program, such as: ... to increase the quality and quantity of research collaborations between NASA and the academic community that contribute to NASA's research objectives; ...to provide research opportunities for college and university faculty that serve to enrich their knowledge base; ...to involve students in cutting-edge science and engineering challenges related to NASA's strategic enterprises, while providing exposure to the methods and practices of real-world research; ...to enhance faculty pedagogy and facilitate interdisciplinary networking.... 1

show abstract

Electronically de-spun phased array antenna for spinning spacecraft

Cited by 2 publications

References 3 publications

Effect of polarization on the link dynamics of a spinning low‐earth orbits satellite aligned with geomagnetic field

Effect of polarization on the link dynamics of a spinning low‐earth orbits satellite aligned with geomagnetic field

Educational Benefits Of Antenna Design Experience On A Nasa/Asee Summer Fellowship Program

Contact Info

Product

Resources

About