Self-correction scheme by adjusting the navigation signal transmission time

2016 ◽  
Author(s):  
Kyuman Lee ◽  
Jaesung Lim
Keyword(s):  
Signal Transmission ◽  
Transmission Time ◽  
Navigation Signal ◽  
Correction Scheme

Coordinateless method of measuring signal transmission time through satellite television channels

1987 ◽  
Vol 30 (2) ◽  
pp. 158-159
Author(s):  
Yu. A. Fedorov ◽  
Yu. D. Ivanova ◽  
A. I. Shchavelov
Keyword(s):  
Signal Transmission ◽  
Transmission Time ◽  
Satellite Television ◽  
Measuring Signal

scholarly journals A Link Distance Division Based Time Division Multiple Access Protocol for Directional Aeronautical Relay Networks

2020 ◽  
Vol 38 (1) ◽  
pp. 147-154
Author(s):  
Zhongjiang Yan ◽  
Qianqian Li ◽  
Bo Li ◽  
Mao Yang
Keyword(s):  
Data Transmission ◽  
Signal Transmission ◽  
Transmission Time ◽  
Extension Problem ◽  
Access Protocol ◽  
Link Distance ◽  
Wireless Signal ◽  
Transmission Link ◽  
Time Division ◽  
Multiple Access Protocol

In directional aeronautical relay networks, the airplane relay explores the advantages of the directional antenna, in terms of long transmission distance, low transmission power, small interference range and so on, to help the ground nodes transmitting data. However, data transmission delay extension problem occurs when the distance of the transmission link extends, where the wireless signal transmission time approximates the data transmission time such that the wireless signal transmission time cannot be omitted. To address the data transmission delay extension problem, a link distance division based time division multiple access protocol, LDD-TDMA, is proposed in this paper. Different from the traditional TDMA protocol, where the time slots are equal and are determined by the longest transmission link, the length of the time slots are different and are determined by different transmission links. Furthermore, the concept of communication coverage ring is proposed where the nodes located in the same ring communicate with the relay utilizing the same time slot length. The relationships between the number of rings, the ring radius and the transmission range of the LDD-TDMA are modelled and derived as a closed formula, where the ring radius are optimized such that the gain is maximized. Simulation results show that LDD-TDMA outperforms TDMA by 13.37% when the transmission range is 200 km and the ring number is 4.

scholarly journals Wireless Power and Signal Transmission Based on Time-sharing Multiplexing for WPT System

2021 ◽  
Vol 252 ◽  
pp. 01023
Author(s):  
Xiaorui Wu ◽  
Wenlan Gong ◽  
Jing Xiao ◽  
Shaonan Chen ◽  
Ning Wu
Keyword(s):  
Power Transmission ◽  
Transmission Rate ◽  
Signal Transmission ◽  
Transmission Efficiency ◽  
Wireless Transmission ◽  
Transmission Time ◽  
Time Sharing ◽  
Wireless Power ◽  
Practical Applications ◽  
The Relationship

In wireless power transfer (WPT) systems, wireless transmission of signals is particularly important for some practical applications. An effective approach of signal and energy synchronous transmission based on time-sharing multiplexing of the same coupled coil is proposed in this paper. Using the same coupled coil, the signal transmission is carried on when interruption of power transmission happens. To realize the proposed method, the relationship between power transmission time and signal transmission time is provided to obtain the optimal transmission process of the power and signal. Besides, the power transmission efficiency (PTE) and the signal transmission rate (STR) are analyzed. Finally, the effectiveness of the proposed method is verified by the experiment.

Architecture Design of Multisystem Satellite Navigation Signal Simulator Base on Software

2014 ◽  
Vol 568-570 ◽  
pp. 1001-1007
Author(s):  
Zhan Shu ◽  
Rong Chen
Keyword(s):  
Low Cost ◽  
Signal Transmission ◽  
Estimation Method ◽  
Doppler Frequency ◽  
Satellite Navigation ◽  
Satellite Navigation System ◽  
Signal Simulator ◽  
Navigation Signal ◽  
Navigation Signals ◽  
Modulation Methods

Compared to conventional navigation signal simulators, software simulator has many advantages, which include flexible design, easy extending, strong openness, and low cost. With the development of satellite navigation, satellite navigation system is getting more and more complicated. Based on the analysis for satellite navigation signal model in different modulation methods of multisystem, it is very urgent to establish a unified description method, which can reduce duplication writing of algorithm. firstly, description method for multisystem satellite navigation signal simulator is proposed. Secondly, it can describe different systems of satellite navigation signals and provide estimation method for signal transmission delay time and Doppler frequency shift. Finally, the signal of simulation is validated.

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