Analysis of influence of the solar window’s thermal characteristics on thermal stability of optical communication antennas

Space laser communication optical antennas have very high requirements for the stability and uniformity of the temperature field. The GEO satellite-borne laser communication is affected by the violent alternating solar heat flow, which causes the thermal disturbance of the in-orbit temperature field of the extra-satellite optical antenna to become unstable. Reduce optical communication time. For this reason, the paper proposes a ?sun window? as a solar spectral filter device to shield solar radiation, combined with the thermal design of the optical antenna system, based on thermal simulation analysis to study the effectiveness of the solar window to suppress the thermal disturbance of the optical antenna temperature field. The research results show that the thermal control optimization design of the optical antenna system based on the "sun window" has a significant effect in suppressing the thermal disturbance of the optical antenna temperature field: the stability of the temperature field of the primary mirror is increased by 2.2 times, the stability of the temperature field of the secondary mirror is increased by 10.6 times. The uniformity of the temperature field of the secondary mirror is increased by about ten times, and the time that meets the requirements of the stability and uniformity of the optical communication antenna temperature field can be up to 24 hours per day, which is more than three times that of the solution without the "sun window".

Download Full-text

Multi-platform laser communication networking optical antenna system design

10.1117/12.2245660 ◽

2016 ◽

Author(s):

Tao Zhang

Keyword(s):

System Design ◽

Antenna System ◽

Laser Communication ◽

Optical Antenna

Download Full-text

Structure Design and Finite Element Analysis of Receiving System for Optical Communication

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.552.548 ◽

2013 ◽

Vol 552 ◽

pp. 548-553

Author(s):

Shu Bin Liu ◽

Tian Yuan Gao ◽

Ya Bo Wu

Keyword(s):

Optical Communication ◽

Rapid Development ◽

Structure Design ◽

Laser Communication ◽

Test Results ◽

Element Analysis ◽

Primary Mirror ◽

Secondary Mirror ◽

Key Technologies ◽

Mirror Structure

Along with the rapid development of science and technology, and due to the special advantage of laser communication, such as big traffic and good secrecy, the application of optical communication is more and more wide. One of key technologies is the structure design of receiving system. In this paper, a structure of receiving system for optical communication based on Cassegrain system is introduced. Consist of the support structure of primary mirror and secondary mirror, adjustment structure of secondary mirror, structure design of reflectors, etc. FEM is used to analyze the distortion of primary mirror which is based on this structure. The distortion is caused by pressure, self-weight and temperature change, etc. And the stress deformation of primary mirror tube is analysed particularly. Analysis and test results demonstrate that the design project is reasonable.

Download Full-text

Assessing the temporal reliability of rhythm metrics

Journal of the International Phonetic Association ◽

10.1017/s0025100311000326 ◽

2011 ◽

Vol 41 (3) ◽

pp. 271-281 ◽

Cited By ~ 8

Author(s):

Rachael-Anne Knight

Keyword(s):

Current Paper ◽

Empirical Measure ◽

The Sun ◽

British English ◽

The North ◽

North Wind ◽

The Stability ◽

Current Popularity ◽

Temporal Reliability

Despite the current popularity of rhythm metrics, there has been relatively little work aimed at establishing their validity or reliability, important characteristics of any empirical measure. The current paper focuses on the stability, or temporal reliability, of rhythm metrics by establishing if they give consistent results for the same speakers, in the same task, on successive occasions. Four speakers of Southern British English were recorded reading ‘The North Wind and the Sun’ (NWS) passage on three consecutive days. Results indicated that some measures correlate more highly across time than others, and the choice of a measure that is both reliable and valid is discussed. It is suggested that the metric that best fits these criteria is formulated in terms of the proportion of vowels within an utterance (%V).

Download Full-text