Single Access Antenna Pointing Control System Design of TDRS

Yuan, Jinpeng; Yang, Dechang; Sun, Xi

doi:10.1109/isscaa.2006.1627558

Cited by 3 publications

(1 citation statement)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The antenna is driven by two-axis antenna pointing mechanism (APM) to get its exact direction for the acquisition and tracking of targets. Usually the TDRS's antenna is very large and needs high tracking accuracy (Jinpeng et al, 2006), so there are higher requirements for the pointing mechanism with its capacity of driving performance, pointing accuracy and reliability. It is necessary to test the performance of the antenna pointing mechanism before launching a TDRS to ensure that the APM meets these requirements.…”

Section: Introductionmentioning

confidence: 99%

Research on a Hierarchical and Simultaneous Gravity Unloading Method for Antenna Pointing Mechanism

et al. 2017

View full text Add to dashboard Cite

Abstract. This paper presents a hierarchical and simultaneous gravity unloading method. An air bearing gravity unloading facility for two-orthogonal-axis antenna pointing mechanism (APM) is designed based on this method. This method is proposed based on the characteristics analysis of the two-orthogonal-axis APM and air bearings. The mechanism of the hierarchical and simultaneous gravity unloading method is described in detail. It solves the coupling problem of two axes and unloads the gravity of both joints hierarchically and simultaneously. The air bearing gravity unloading facility which is a structure mechanism with two layers based on this method is designed with planar air bearing and air spindle. The structure of the facility is described in detail. The dynamic models of the APM with its load in space environment and on the air bearing gravity unloading facility are derived respectively. With the analysing of the driving torques and vertical forces of the APM joints in both models, the results demonstrate that the gravity unloading facility can simulate the microgravity environment successfully. This conclusion is also proved by the dynamic simulation with ADAMS software. The simulation also provides some optimization targets for the gravity unloading facility. At last, the gravity unloading facility is established and some experiments are done. The dynamic models, the simulation results and the experiments all show the effectiveness of the hierarchical and simultaneous gravity unloading method.

show abstract

Section: Introductionmentioning

confidence: 99%

Research on a Hierarchical and Simultaneous Gravity Unloading Method for Antenna Pointing Mechanism

et al. 2017

View full text Add to dashboard Cite

show abstract

Satellite Communications

Meadows¹

2020

Wireless Communications Systems

View full text Add to dashboard Cite

Orthomode Transducers (OMTs) are passive microwave devices whose function is to discriminate between the two orthogonal single signals received by dual-polarization antenna systems. In transmission, they combine these signals and route them to the antenna (typically a horn-type antenna with revolution symmetry). Satellite communication systems and radio astronomy are typical environments where OMTs are found. Their use in communication systems allows to double the capacity of the system, since two different signals can share the same frequency spectrum, as long as they are associated to different orthogonal polarizations. This project is focused on OMTs in waveguide transmission systems. These devices have been developed over the last decades, though they are not widely dealt with in the literature. The design of these structures requires a good comprehension of some notions about electromagnetic theory and waveguides analysis. To set the framework of this project, a detailed bibliographic study of OMT components will be carried out. One of the most typical structures found in wideband OMTs is the so-called Turnstile junction. This particular structure holds some symmetry properties that grant a broadband performance. Among all the aspects involved in the design of a Turnstile junction, the design of its internal matching obstacle is one of the key elements. The aim of this project is to address an exhaustive study of all the components involved in the design of an OMT based on the Turnstile junction. For that reason, besides the theoretical study of electromagnetic concepts and the Turnstile junction, some routing structures such as bends, transformers and recombiners will be also studied and analyzed. Two complete OMT designs will then be carried out: the first one will follow some typical OMT specifications and it will include a new internal obstacle for the Turnstile junction based on mitered bends, proposed for the first time in this project; the second one will represent an effort to improve existing wideband OMTs performance. For the latter, the addition of a new degree of freedom for the Turnstile junction will be proposed. It consists of a configuration of angled branches for the junction, using the same obstacle of the first design. The aforementioned will result in a more compact structure with even better performance.

show abstract

Antenna Scheduling for Multiple User Satellites in Space Data Relay Networks

Zhu

Sheng

et al. 2019

ICC 2019 - 2019 IEEE International Conference on Communications (ICC)

View full text Add to dashboard Cite

Single Access Antenna Pointing Control System Design of TDRS

Cited by 3 publications

References 5 publications

Research on a Hierarchical and Simultaneous Gravity Unloading Method for Antenna Pointing Mechanism

Research on a Hierarchical and Simultaneous Gravity Unloading Method for Antenna Pointing Mechanism

Satellite Communications

Antenna Scheduling for Multiple User Satellites in Space Data Relay Networks

Contact Info

Product

Resources

About