DESIGN AND IMPLEMENTATION OF REMOTE RFI MONITORING SYSTEM For Ghana - - PowerPoint PPT Presentation

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DESIGN AND IMPLEMENTATION OF REMOTE RFI MONITORING SYSTEM For Ghana Radio Astronomy Obervatory-Nkutunse BY Joseph A. K. Nsor September 21, 2020 (GSSTI) GRAO September 21, 2020 1 / 33 OUTLINE OF PRESENTATION 1 Abstract 2 Introduction 3

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DESIGN AND IMPLEMENTATION OF REMOTE RFI MONITORING SYSTEM For Ghana Radio Astronomy Obervatory-Nkutunse

BY Joseph A. K. Nsor

September 21, 2020

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OUTLINE OF PRESENTATION

1 Abstract 2 Introduction 3 Internal Challenge 4 Objectives 5 Engineering 6 Results 7 Conclusion 8 Future Upgrade

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Outline

1 Abstract 2 Introduction 3 Internal Challenge 4 Objectives 5 Engineering 6 Results 7 Conclusion 8 Future Upgrade

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Abstract

This work presents the design of an automated Radio Frequency Interference Monitoring System (RFIMS) for an informed data and future upgrades for interferences mitigation. Generally, the degradation

f radio telescopes data is influenced by several factors that are due to

the current environmental conditions.This requires an Investigation of Radio Frequency Interference (RFI) for the proposed telescope

peration frequency by performing a site survey to gather information
f the spectrum usage of the converted 32m class antennas into radio

astronomy telescopes. Keywords: Radio Astronomy, LNA, Frequency Spectrum, Radio Frequency Interference, and Mitigation Techniques.

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Outline

1 Abstract 2 Introduction 3 Internal Challenge 4 Objectives 5 Engineering 6 Results 7 Conclusion 8 Future Upgrade

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History

Figure 1: Ghana’s Decommission Satellite Dish

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Global Issue

Figure 2: World Network of Telescopes

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Minus Ghana

Figure 3: UV Coverage of The Milky Way Without Ghana

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Plus Ghana

Figure 4: Ghana’s Contribution to Viewing the Milky Way

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Outline

1 Abstract 2 Introduction 3 Internal Challenge 4 Objectives 5 Engineering 6 Results 7 Conclusion 8 Future Upgrade

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Evidence

Figure 5: Conversion of Decommission Dishes into Telescopes

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Environmental Factors

Figure 6: Traditional Measurement Method

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Outline

1 Abstract 2 Introduction 3 Internal Challenge 4 Objectives 5 Engineering 6 Results 7 Conclusion 8 Future Upgrade

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Objectives

This project undertaken is: To design and implement an automated RFI monitoring system. To determine the exact direction of an interfering signal.

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Proposed

Figure 7: Proposed Solution

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Outline

1 Abstract 2 Introduction 3 Internal Challenge 4 Objectives 5 Engineering 6 Results 7 Conclusion 8 Future Upgrade

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Polarization Subassembly

(a) First Subsystem

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Azimuth Subassembly

(a) Second Subsystem

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Complete Antenna System

(a) Antenna System

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Wire Configuration

Figure 11: Wiring Layout

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Step Parameters

Steprev= 1Rev

Stepz 360 1.8 =200 step rev

(1) For antenna polarization in E/H plane, its step angle is obtained by multiplying the step-rev to the number of micro stepping per

revolution. And so in achieving 90o angle for a full revolution,

Pangle = steprev microstepping = 200 1/4 = 50step rev (2) where (P-Angle) is Polarization angle. Considering the antenna pattern it is recommended that monitoring is done at an angle of 45o for a full revolution of 360o, with (A-angle) as the azimuth angle of rotation [70]. Aangle = steprev microstepping = 200 1/8 = 25step rev (3)

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User Interface

Figure 12: Antenna Interface

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Outline

1 Abstract 2 Introduction 3 Internal Challenge 4 Objectives 5 Engineering 6 Results 7 Conclusion 8 Future Upgrade

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Preliminary Survey

Measurement Platform. Cardinal Compass.

(a) Azimuth Platform (b) Compass

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Results

Figure 14: Horizontal Polarization

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Results

Figure 15: Vertical Polarization

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FAT Ref1

Figure 16: FAT for 5GHz

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FAT Ref2

Figure 17: FAT for 6.7GHz

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Outline

1 Abstract 2 Introduction 3 Internal Challenge 4 Objectives 5 Engineering 6 Results 7 Conclusion 8 Future Upgrade

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Conclusion

Figure 18: Complete RFIMS

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Outline

1 Abstract 2 Introduction 3 Internal Challenge 4 Objectives 5 Engineering 6 Results 7 Conclusion 8 Future Upgrade

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Upgrade

To write an algorithm that the RFIMS can point to an interfering frequency of interest.

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END OF PRESENTATION

THANK YOU

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