Redirigiendo al acceso original de articulo en 16 segundos...
Inicio  /  Aerospace  /  Vol: 9 Par: 5 (2022)  /  Artículo
ARTÍCULO
TITULO

Effects of Surface Errors of Antennas on Detection Performance of Space VLBI

Yangyang Zhang    
Huijie Liu and Xingfu Liu    

Resumen

This work investigates the effects of the surface errors of the satellite antenna on the detection performance of the space VLBI system. First, the relationship between the surface errors and the antenna gain loss is analyzed, and then the influence of the gain loss on the detection performance of the VLBI system is analyzed. Both the uniform and nonuniform distributions of errors are studied, and the second-order Taylor expansion is performed on the errors to simplify the calculation. When the errors distribute nonuniformly, the solver SCIP is adopted to solve the corresponding distribution, which leads to the maximum gain loss of the antenna. Taking the VLBI system with two base stations as the object, and each station?s radio telescope is a hoop truss deployable antenna with 30 m aperture, the effects of antenna gain loss on the detection capability of the radio telescope and the delay error of the VLBI system are studied. The study of extreme working conditions will have a higher guiding significance for the overall link analysis of practical projects.

 Artículos similares

       
 
Jiaming Fan and Xuefeng Xu    
The phenomenon of surface charging, known as contact electrification or tribocharging, has wide-ranging applications but also notable hazards. Precisely measuring surface charge density in insulating materials is crucial for optimizing tribocharging and ... ver más
Revista: Applied Sciences

 
Hilal Yilanci and Pinar Gezer    
Aim: The objective of this systematic review was to offer quantitative evidence regarding the influence of surface properties on the mechanical stability of miniscrews. Materials and Methods: The comprehensive search strategy involved querying databases,... ver más
Revista: Applied Sciences

 
Ruosi Zha, Kai Wang, Jianglong Sun, Haiwen Tu and Qi Hu    
In this paper, the ditching performance of a seaplane model on calm water and a uniform water current coupled with wind was numerically investigated. The overset grid technique was applied to treat the large amplitude of the body motions of the seaplane ... ver más

 
Yuqing Mao, Yoann Charlon, Yves Leduc and Gilles Jacquemod    
Although Moore?s Law reaches its limits, it has never applied to analog and RF circuits. For example, due to the short channel effect (SCE), drain-induced barrier lowering (DIBL), and sub-threshold slope (SS)?, longer transistors are required to implemen... ver más

 
Hongyu Zhao, Xiaotao Hong, Juanfen Chai, Bo Wan, Kaichao Zhao, Cuihong Han, Wenjing Zhang and Huan Huan    
Microplastics (MPs) are abundant in soil and the subsurface environment. They can co-transport with pathogens or act as vectors for pathogens, potentially causing severe ecological harm. The interaction of MPs with pathogens is an important topic. To des... ver más
Revista: Water