The Design and Application of UAV’s Digital Steering Gear

2011 ◽  
Vol 181-182 ◽  
pp. 998-1005
Author(s):  
Shi Jun Xu ◽  
Yong Hong Hu ◽  
Wei Wan
Keyword(s):  
Code Division Multiple Access ◽  
Multiple Access ◽  
Computer Control ◽  
Normal Operation ◽  
Electromagnetic Environment ◽  
Aerial Vehicle ◽  
Working Principle ◽  
Environmental Requirements ◽  
Code Division Multiple ◽  
Time Division

For a special electromagnetic environment and the installation of environmental requirements of UAV (unmanned aerial vehicle) airborne, a design of digital anti-jamming steering gear is given. The composition, functions and working principle of the steering gear are described in details. The key circuits of functional modules are given, introduce a CDMA (code division multiple access) communication protocol of Digital Servo instruction and TDMA (time division multiple access) state data frame format. Take a UAV as an example, discusses the multi-steering application in airborne systems workflow. The application results showed that: this design not only improves the steering anti-jamming capability, ensures that the steering gear in the normal operation of complex electromagnetic environment, but also greatly reduces the UAV onboard computer control interfaces, improves flexibility and reliability.

Determination of Number of Channels in Multiple Access Techniques for Wireless Communications

2015 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
Venkata Raghavendra Miriampally ◽  
G. Subba Rao ◽  
V Sudheer Raja
Keyword(s):  
Wireless Communications ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
Radio Spectrum ◽  
Base Station ◽  
Available Bandwidth ◽  
Code Division Multiple ◽  
Time Division ◽  
Communications System

<p>In wireless communications system, it is desirable to allow the subscriber to send simultaneously information to the base station while receiving information from base station. Multiple access techniques are used to allow many mobile users to share simultaneously a finite amount of radio spectrum. Frequency division multiple access (FDMA), time division multiple access(TDMA), and code division multiple access (CDMA) are the three major access techniques used to share the available bandwidth in a wireless communication system. In this paper we calculated the number of channels required for FDMA &amp; TDMA techniques depending on various factors such as spectrum, channel band width etc.</p>

scholarly journals Theoretical Investigation into Spectral Coexistence of CDMA and TDMA Systems

2008 ◽  
Vol 5 (1) ◽  
pp. 1 ◽  
Author(s):  
A.M. Abbosh ◽  
M. A. Shehathah
Keyword(s):  
Theoretical Investigation ◽  
Spectral Efficiency ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
Radio Spectrum ◽  
Considerable Improvement ◽  
Multimedia Systems ◽  
Cdma System ◽  
Code Division Multiple ◽  
Time Division

 The scarcity of available radio spectrum presently limits the extension of modern multimedia systems. This paper presents a theoretical investigation into the possibility of using a frequency overlay of a narrowband Code Division Multiple Access (CDMA) System and a Time Division Multiple Access (TDMA) System to provide a greater spectral efficiency. This paper shows that under certain conditions the two systems can operate in the same frequency band and in the same area with a considerable improvement in the overall capacity of the whole system. 

scholarly journals CDMA based Data Transmission Methods between Vehicles

2019 ◽  
Vol 8 (9S4) ◽  
pp. 236-239
Keyword(s):  
Code Division Multiple Access ◽  
Multiple Access ◽  
High Capacity ◽  
Daily Lives ◽  
The Road ◽  
Network Connection ◽  
New Concepts ◽  
Code Division Multiple ◽  
Time Division

There are large amounts of cars passing through the streets every day and this increases significantly in the morning or evening rush hours. The automotive industry has evolved greatly and many technologies have been introduced to automate many of its functions. The code division multiple access(CDMA) is mostly used in our daily lives. The emergence of driverless vehicles has led to a boom in the world of automotive technology, because of its importance in creating a new environment and new concepts aimed at human conformability and increased productivity. Many solutions have been appeared to offer suitable self-driving vehicles environment that is capable to overcome the arising problems. When the self-driving vehicles are well equipped, the only remaining goal is how to control external communications with other vehicles, with updates that can appear in the road and with main center. It come through by the help of CDMA network connection. This paper proposed code division multiple access as a communication technology to overcome the problems may appeared in time division multiple access.The proposed system of robot cars is implemented through high way environment scenario. The communication system is implemented via code division multiple access (CDMA) to realize high security, high quality of services, robustness and high capacity.

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