Estimation of Errors Caused by Spherical Approximation of Earth Shape in Radio Emitters Position Fixing Process Using Direction Finding
Viacheslav Volodymyrovych Kalugin,
Anatoliy Heorhievych Kochergin,
Olexandr Volodymyrovych Chebotov
Issue:
Volume 2, Issue 4, August 2014
Pages:
31-36
Received:
13 August 2014
Accepted:
13 September 2014
Published:
30 September 2014
DOI:
10.11648/j.ijssn.20140204.11
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Abstract: Accuracy improving of radio emitter position fixing is sufficient in the field of radiomonitoring, communication intelligence, radionavigation and radiogeodesy. This paper represents results of errors estimation in radio emitter position fixing process applying spherical approximation of the Earth surface obtained by means of numerical simulation. Study of values of these errors was paid little attention in scientific literature. Besides that there are no indications as for development and implementation of algorithms accounting for Earth spheroid shape. In presented article it is shown that for improving accuracy of position fixing on spreading radio paths it is necessary to take into consideration Earth surface shape. Realization of position fixing algorithms accounting earth spheroid shape revealed their high efficiency in real RDF networks. Software realizing these algorithms is implemented in several production prototypes of RDF networks.
Abstract: Accuracy improving of radio emitter position fixing is sufficient in the field of radiomonitoring, communication intelligence, radionavigation and radiogeodesy. This paper represents results of errors estimation in radio emitter position fixing process applying spherical approximation of the Earth surface obtained by means of numerical simulation. ...
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Minimizing Power Consumption through Swinging Power Mode in Wireless Sensor Networks
Harish Kumar,
Prashant Singh,
Jai Prakash Gupta
Issue:
Volume 2, Issue 4, August 2014
Pages:
37-41
Received:
18 October 2014
Accepted:
27 October 2014
Published:
30 October 2014
DOI:
10.11648/j.ijssn.20140204.12
Downloads:
Views:
Abstract: Wireless Sensor Networks have predefined objectives which require them to connect and communicate with other nodes. During communication these nodes transmit and receive data and other control packets. This paper proposes Swing-MAC, a Medium Access Control protocol for energy efficiency designed for wireless sensor networks. It adjusts transmission power level in a swinging mode where transmission power level keeps swinging between minimum and maximum requirement of the network. Minimum and maximum transmission power level is based on the expected coverage between nodes. As transmission power keeps swinging between two intervals on cyclic basis this leads to energy conservation resulting in a longer battery life. Simulation results show that Swing-MAC obtains significant energy savings compared with 802.11 MAC without sleeping.
Abstract: Wireless Sensor Networks have predefined objectives which require them to connect and communicate with other nodes. During communication these nodes transmit and receive data and other control packets. This paper proposes Swing-MAC, a Medium Access Control protocol for energy efficiency designed for wireless sensor networks. It adjusts transmission...
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