iosr-JEEE   Volume-16 ~ Issue-1 ~ Jan. – Feb. 2021

Abstract: To choose a trajectory to reduce the helicopter's height, providing the continuous control of a landing place with the onboard television chamber's help is considered. Neuron realization of management by the wobble plate and is offered by the collective pitch of the screw of the helicopter In many transport tasks carried out by a helicopter in difficult weather conditions [1], it is advisable to use automatic devices to help the crew, in particular, for the delivery of cargo and its landing, as shown in Fig. 1. In Figure 1, Н0 and x0 are the initial coordinates of the descent trajectory, Нk is the specified final height above the landing site for the drop of the cargo, x1 and x2 are the coordinates of the landing landmarks, ψ1 and ψ2 are the viewing angles of landmarks 1 and 2 on the TV camera screen, formed between the optical axis cameras and directions to each of the landmarks..........

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Abstract: RADAR can be defined as the electromagnetic system that senses, detects, and locates the objects that are present within the ambience. The word stands for Radio Detection and Ranging. The term was used in for the first time in the year 1940 by the US navy. During that time, the system was designed to transmit electromagnetic wave and detect the reflected signal. The operations attributed to the Radar were specifically for the detection and transmission of electromagnetic wave and reflected signals respectively. However, prior to 1940, the early development of the radar ensured the detection of an existing target and provision of its distance measurement from a specific location. In the Second World War, the Radar was used to give different notifications pertaining to the approach of a hostile aircraft. It also used for routing aircraft weapons to be used for the Second World War. In the modern times, the radar system has a lot of applications and uses. It can be used for the extraction......

[1]. Almeida, L. 2012. Radar Clutter Mitigation Techniques, Institute of Technical, Portugal.
https://fenix.tecnico.ulisboa.pt/downloadFile/281870113702211/resumo.pdf
[2]. Bekiroglu,K. Ayazoglu, M. 2016. An Efficient to Ghost Radar Elimination, IEEE XPLore.
https://ieeexplore.ieee.org/document/7525458
[3]. Besson, O. Scharf, L. Kraut, S. 2016. On Some Detection Problems In Radar Array Processing Involving Eigvalues of Wishart and Related Random Matrices, Colorado State University U.S.A. http://web.mit.edu/sea06/agenda/talks/Besson.pdf
[4]. Bhatta, P.N. GeethaPriya, M. 2016. RADAR and its Applications, IJCTA.
https://www.researchgate.net/publication/317427496_RADAR_and_its_Applications
[5]. Chapman,T. Hall, G. 2000. Radar Fundamentals, CRC.
http://dsp-book.narod.ru/RSAD/C1828_PDF_C01.pdf

Abstract: This study presents the performance improvement of satellite networks based on fuzzy logic controller. The satellite communication is an essential part of telecommunication systems which carries a large amount of data and telephone traffic in addition to television signals. At high frequency, satellite links are more sensitive to signal fades due to rain, especially in the tropical region. Rain attenuation can have a distorting effect on the quality of service (QoS) at higher frequencies that lead to excessive digital transmission error. This loss of signal is commonly referred to as signal attenuation. Rainfall data was obtained from the Nigerian Meteorological Agency for a period of ten (10) years for the purpose of estimating attenuation using ITU-R model and calculation of received signal level......

Key Word: Satellite networks; Fuzzy logic controller; Rain attenuation; ITU-R model.

[1]. Harb, K. Yu, F.R. and Abdul-Jauwad, S. (2012). "Performance evolution in satellite communication networks along markovian channel prediction," Journal of Wireless Networking and Communications, vol.2, no. 5,pp 143-157.
[2]. Vangli, H. (2010). "Construction of a Satellite Ground Station for Low Earth orbit Communication".
[3]. Jena, J. (2012)."A study of rain attenuation calculation and strategic power control for Ka-band satellite communication in India".
[4]. Kota, S. and Marchese, M. (2003). "Quality of service for satellite IP networks: a survey", International Journal of Satellite Communications and Networking, Vol. 21, No. 4–5, pp. 303–349.
[5]. Sarat, K.K. Vijaya, B.R.S. and Narayana, R. (2008)."Prediction of Ku Band Rain Attenuation Using Experimental Data and Simulations for Hassan, India," International Journal of Computer Science and Network Security, Vol. 8, No. 4.

Abstract: Kenya is an industrializing nation in Africa and envisions transforming itself into a newly industrializing, middle-income country by 2030, with a globally competitive and prosperous economy. In order for the Government of Kenya to meet the increased power demand, it has invested heavily on the increased generation of renewable sources such as hydro, solar and wind. The Government is targeting to increase wind penetration to 2036MW by 2030. Wind is carbon emission free hence environmental concerns are met, however, the electrical system and the mechanical system are decoupled hence the rotor angle stability is affected. It is thus necessary to investigate the impacts of wind power penetration on the dynamic behavior of the power system concerned such as small signal stability studies.......

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Abstract: 5G wireless development is in constant activity. The performance of a radio input module is increasingly critical in the radio frequency signal path, especially those involving the amplifier. This article discusses the design of a transistor amplifier for 5G wireless applications The Transistor used for said amplifier is a FET designed by Alpha Industries named sp_aiiAF035P1_00_19941209 with voltage Vds = 5V, Ids = 70mA. The design of the amplifier is made with the ADS (Advanced Design System) software we used the micro-ribbon lines for the assembly of our amplifier they are printed on the Rogers Duriod 5880 substrate with a thickness of 0.127 mm and a relative permittivity of 2.2 . The technique of impedance adaptations is made by a stub favoring the transfer of maximum power from the input to the output........

Key Word: ADS; Amplifier; FET; Gain; Transistor.

[1]. G. Gampala and C. J. Reddy, "Design of millimeter wave antenna arrays for 5G cellular applications using FEKO",2016 IEEE/ACES International Conference on Wireless Information Technology and Systems (ICWITS) and Applied Computational Electromagnetics (ACES), Honolulu, HI, 2016, pp. 1-2.
[2]. Benjebbour, A.Saito, K.Saito, Y.& Kishiyama, "5G Radio Access Technology", NTT Technical Journal, 17(4), (2016)
[3]. Iskandar Fitri, Al Amin Akbar T , "A New Gridded Parasitic Patch Stacked Microstrip Antenna for Enhanced Wide Bandwidth in 60 GHz Bandl", IEEE Transaction on Antennas and Propagation, 2017
[4]. P. Asbeck, IEEE RFIC Symp., WSB Woskshop "Highly Efficient 5G PA Design", San Francisco, (2016)
[5]. T. Kamgaing, A. A. Elsherbini, S. N. Oster, B. M. Rawlings, and K.-O. Lee, "Ultra-thin dual polarized millimeter-wave phased array system-in-package with embedded transceiver ," in 2007 IEEE/MTT-S International Microwave Symposium, Phoenix, AZ, USA, 2015