Nonlinear Behavior of the Radio Frequency Interference (RFI) Sources at Faculty of Applied Sciences, MARA University of Technology

• Autorzy: Hamidi Z. S. , Shariff N. N. M.
• Języki publikacji: EN

Abstrakty

EN

In this article, we describe and compare several sources of the nonlinear of Radio Frequency Interference (RFI) based on classification methods. It is very important to characterize and understand the nature of interference in as much of the candidate spectrum as possible. Preliminary analysis has been done in 2011. As data sizes of observations grow with new and improved solar monitoring system, the need for completely automated, robust methods for RFI mitigation is highlighted. The current status of RFI noise level is being compared at two different sites (i) indoor and (ii) outdoor. The main objective is to evaluate and find the best range of low frequency in MHz for the solar monitoring purpose. Our findings are consistent with those of previous studies. There is not much different in terms of the sources of RFI. However, the level of RFI is become increase. Based on the results, it was found that the distribution of RFI sources in indoor site is in the range from -(80-105) dBm. A strong and moderate RFI can be identified in the range of -100 dBm. The dominant sources in this region are due to the fixed mobile signal with 10 points of this signal from 1-2000 MHz. If we compare with outdoor site, the distribution of RFI sources in indoor site is in the range from -(75-105) dBm. It means that the signal of noise is larger compared with indoor site. While new sources strive to remain the increasing of RFI signal levels, numerous factors interact to influence the pattern of this noise. Reporting to the authoritative body should be made to make sure the allocation of the solar monitoring frequency region was not used by other applications. This work is a current scenario of the nonlinear RFI level at our site.

Słowa kluczowe

EN

Radio Frequency Interference (RFI); RFI sources; solar radio burst; CALLISTO

• Wydawca: Przedsiębiorstwo Wydawnictw Naukowych "DARWIN"
• Czasopismo: International Letters of Chemistry, Physics and Astronomy
• Rocznik: 2014
• Tom: Vol. 15
• Strony: 39--47
• Opis fizyczny: Bibliogr. 26 poz., rys., tab.

Twórcy

autor

Hamidi Z. S.

• School of Physics and Material Sciences, Faculty of Sciences, MARA University of Technology, 40450, Shah Alam, Selangor, Malaysia

autor

Shariff N. N. M.

• Academy of Contemporary Islamic Studies (ACIS), MARA University of Technology, 40450, Shah Alam, Selangor, Malaysia

Bibliografia

• [1] Z.S.Hamidi, Z. Abidin, Z. Ibrahim, C. Monstein, N. Shariff, International Journal of Fundamental Physical Sciences 2 (2012) 32-34.
• [2] Z. S. Hamidi, N. N. M. Shariff, C. Monstein, W. N. A. Wan Zulkifli, M. B. Ibrahim, N. S. Arifin, N. A. Amran, International Letters of Natural Sciences 5 (2014) 10-17
• [3] A.O. Benz, M. Guedel, H. Isliker, S. Miszkowicz, W. Stehling, Sol. Phys. 133 (1991) 385-393.
• [4] Z.S.Hamidi, N.N.M.Shariff, Z.Z. Abidin, Z.A. Ibrahim, C.Monstein, Malaysian Journal of Science and Technology Studies 9 (2013) 15-22.
• [5] Z.S.Hamidi, Z.Z.Abidin, Z.A. Ibrahim, N.N.M. Shariff, Indication of radio frequency interference (RFI) sources for solar burst monitoring in Malaysia, AIP Conference Proceedings 1454 (2012) 43.
• [6] N. Anim, Z.S. Hamidi, Z.Z. Abidin, C. Monstein, N. Rohizat, Radio frequency interference affecting type III solar burst observations, PERFIK 2012, AIP Publisher, Pahang Malaysia, 2012, pp. 5.
• [7] Roslan Umar, Zamri Zainal Abidin, Zainol Abidin Ibrahim, Mohd Saiful Rizal Hassan, Zulfazli Rosli, Z.S.Hamidi, Population density effect on radio frequencies interference (RFI) in radio astronomy, ICPAP 2012, AIP Conference Proceedings, Bandung Indonesia, 2012, pp. 4.
• [8] Z.S.Hamidi, N.N.M.Shariff, Evaluation of Signal to Noise Ratio (SNR) of Log Periodic Dipole Antenna (LPDA) Business Engineering and Industrial Applications Colloquium 2013, IEEE, Langkawi, Malaysia, 2013, pp. 434-438.
• [9] R. Umar, Z. Abidin, Z. Ibrahim, N. Gasiprong, K. Asanok, S. Nammahachak, S. Aukkaravittayapun, P. Somboopon, A. Prasit, N. Prasert, Middle East Journal of Scientific Research 14 (2013).
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• [13] Z. Hamidi, N. Shariff, C. Monstein, First Light Detection of A Single Solar Radio Burst Type III Due To Solar Flare Event, (2014).
• [14] Z.S. Hamidi, N.N.M. Shariff, C. Monstein, Z. Abidin, Z. Ibrahim, N. Hashim, R. Umar, N. Aziz, International Journal of Fundamental Physical Sciences 3 (2013) 57-63.
• [15] Z.S.Hamidi, N.M.Anim, N. N.S.Hakimi, N.Hamzan, A.Mokhtar, N.Syukri, S.Rohizat, I.Sukma, Z.A. Ibrahim, Z.Z.Abidin, N.N.M.Shariff, C.Monstein, International Journal of Fundamental Physical Sciences 2 (2012) 4.
• [16] Z.S.Hamidi, Z. Abidin, Z. Ibrahim, N. Shariff, C. Monstein, Observations of coronal mass ejections (CMEs) at low frequency radio region on 15th April 2012, in: R.Shukor (Ed.), PERFIK 2012, American Institute of Physics, Malaysia, 2013, pp. 5.
• [17] Z.S. Hamidi, N. Anim, N.N.M. Shariff, Z.Z. Abidin, Z.A. Ibrahim, C. Monstein, Dynamical structure of solar radio burst type III as evidence of energy of solar flares, in: R.Shukor (Ed.), PERFIK 2012, American Institute of Physics, Malaysia, 2013, pp. 11-15.
• [18] Z.S. Hamidi, N.N.M. Shariff, F.N.Z. Ulum, Z.Z. Abidin, Z.A. Ibrahim, Time Series Analysis of Variance of Sunspots in January till September 2010 and Correlation with Sunspots Areas International Journal of Astronomy 5 (2012) 101-106.
• [19] Z.S. Hamidi, N.N.M.Shariff, C.Monstein, Z.A. Ibrahim, International Letters of Chemistry, Physics and Astronomy 7 (2014) 37-44.
• [20] N. Hashim, Z. Abidin, U. Ibrahim, R. Umar, M. Hassan, Z. Rosli, Z. Hamidi, Z. Ibrahim, Radio Astronomy in Malaysia: Current Status and Outreach Activities, Astronomical Society of the Pacific Conference Series, 2011, pp. 355.
• [21] Z.S. Hamidi, N.N.M. Shariff, Thermal Energy and Power Engineering 3 (2014) 181-184.
• [22] Z.S. Hamidi, N.N.M.Shariff, International Letters of Chemistry, Physics and Astronomy 4 (2014) 29-36.
• [23] Z.S. Hamidi, N.N.M. Shariff, M.F. Ali, C. Monstein, W.N.A.W. Zulkifli, M.B. Ibrahim, N.S. Arifin, N.A. Amran, International Letters of Chemistry, Physics and Astronomy 9 (2014) 84-92.
• [24] Z.S. Hamidi, N.N.M.Shariff, C.Monstein, W.N.A.W. Zulkifli, M.B. Ibrahim, N.S. Arifin, N.A. Amran, International Letters of Chemistry, Physics and Astronomy 8 (2014) 13-19.
• [25] Z.S. Hamidi, N.N.M.Shariff, International Letters of Chemistry, Physics and Astronomy 7 (2014) 30-36.
• [26] Z.S. Hamidi, N.N.M.Shariff, International Letters of Chemistry, Physics and Astronomy 5 (2014) 32-42.