Antenna Configuration Method for RF Measurement Based on DOPs in Satellite Formation Flying

Radio frequency (RF) measurement technology provides a relative navigation solution that can be of great importance to have significant potential for application to the satellite groups. With the development of the RF relative measurement sensors, it is found that the antenna configuration of the sensors affects the precision of relative position and attitude measurement. This study proposes improvements to the precision of the sensors by the virtue of the optimal antenna configuration. Furthermore, the concept of dilution of precision (DOP) is extended to the RF relative measurement sensors, and a new dilution called IDOP is proposed as a benchmark to determine the precision of relative position and attitude measurement in engineering applications of the space mission. In order to select the optimal antenna configuration in real time in a scene where the intersatellite position and attitude change dynamically, this study presents an optimal antenna configuration selection strategy and models the antenna configuration selection as a combinatorial optimization problem. Furthermore, the genetic algorithm (GA) with two encoding mechanisms is proposed to solve this problem. Finally, numerical results are presented to verify the robustness.

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Research on Special Vehicle Attitude Measurement Technology Based on High-Precision Positioning System

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/394/3/032007 ◽

2018 ◽

Vol 394 ◽

pp. 032007

Author(s):

Chuanqiang Yu ◽

Fan Yang ◽

Bowen Zhang

Keyword(s):

High Precision ◽

Measurement Technology ◽

Positioning System ◽

Attitude Measurement ◽

Precision Positioning ◽

Special Vehicle

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Understanding Green Attitudes

Practice, Progress, and Proficiency in Sustainability - Driving Green Consumerism Through Strategic Sustainability Marketing ◽

10.4018/978-1-5225-2912-5.ch004 ◽

2018 ◽

pp. 51-71

Author(s):

Aysen Coskun

Keyword(s):

Consumer Behavior ◽

Attitude Change ◽

Environmental Literature ◽

Future Research ◽

Attitude Measurement ◽

Research Directions ◽

New Methods ◽

Future Research Directions ◽

Attitude Behavior

Many environmental researches are interested in attitudes. Particularly in consumer behavior studies, attitudes are frequently used to identify the determinants of behavior. This chapter provides a framework for green attitude, first by focusing on its components and formation. The attitude-behavior gap is also discussed by categorizing a number of variables that are found to affect this relationship in the environmental literature. Following sections provide well-established scales of green attitudes and how they are measured. Finally, insights for green attitude change are discussed, along with future research directions, which underline the importance of new methods for attitude measurement.

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Research on Static Missile Attitude Measurement Technology Based on Collinear Perspective Model

10.1007/978-981-16-6554-7_103 ◽

2021 ◽

pp. 951-958

Author(s):

Xiaobo Guo

Keyword(s):

Measurement Technology ◽

Attitude Measurement ◽

Perspective Model

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A technique for antenna configuration selection for reconfigurable circular patch arrays

IEEE Transactions on Wireless Communications ◽

10.1109/twc.2008.080212 ◽

2009 ◽

Vol 8 (3) ◽

pp. 1456-1467 ◽

Cited By ~ 22

Author(s):

Daniele Piazza ◽

John Kountouriotis ◽

Michele D'Amico ◽

Kapil R. Dandekar

Keyword(s):

Circular Patch ◽

Configuration Selection ◽

Antenna Configuration ◽

Selection For

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Methodology in Measuring Attitude Change: Problems and Alternatives

Journal of Drug Education ◽

10.2190/9bft-pgfq-xn6f-k8hh ◽

1978 ◽

Vol 8 (4) ◽

pp. 289-297 ◽

Cited By ~ 7

Author(s):

Charles R. Sawyer

Keyword(s):

Research Design ◽

Attitude Change ◽

Attitude Measurement ◽

Drug Education ◽

Education Programs ◽

Apparent Change ◽

Limited Experience ◽

Students Attitudes

Numerous researchers have found that drug education programs produce little or no apparent change in students' attitudes. The present paper points out possible reasons for such findings, emphasizing problems in attitude measurement and research design. Suggestions are made for some methodological alternatives which are suitable even for researchers with limited experience and sophistication. Finally, a study in which such methods were effectively used is discussed.

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Tracking Control of a Maglev Vibration Isolation System Based on a High-Precision Relative Position and Attitude Model

Sensors ◽

10.3390/s19153375 ◽

2019 ◽

Vol 19 (15) ◽

pp. 3375 ◽

Cited By ~ 1

Author(s):

Qianqian Wu ◽

Bilong Liu ◽

Ning Cui ◽

Sifang Zhao

Keyword(s):

High Precision ◽

Relative Position ◽

Tracking Control ◽

Control Algorithm ◽

Vibration Isolation ◽

Measurement Model ◽

Attitude Measurement ◽

Floating Platform ◽

Isolation System ◽

Vibration Isolation System

The maglev vibration isolation system exhibits excellent micro-vibration isolation performance (0.01 Hz to 100 Hz band) in the space environment. However, a collision between the base and the floating platform may occur in an ultra-low frequency range (≤0.01 Hz). To avoid collision, the relative position and attitude between the base and the floating platform needs to be accurately tracked and controlled. In this study, a novel measurement method with four groups of two-dimensional position-sensitive detectors equipped with four laser light sources was proposed. A high-precision relative position and attitude measurement model was established based on the geometric relationship of space coordinates. A proportional-differential (PD) fixed-point control algorithm was adopted to realize tracking control. The control performance of the system was evaluated through simulation. Experiments were also carried out to verify the stability of the system and the precision of the control algorithm. A maglev vibration isolation system prototype was constructed and a test system was established. The proposed relative position and attitude measurement model was verified and the six degrees of freedom relative position and attitude response of the system was tested. Based on the measurement model, the tracking control of the system was proven to have high precision.

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