1. Full name: Tran Van Hoi                                                        2. Sex:   Male

3. Date of birth: December, 5th, 1978                                         4. Place of birth:  Ha Nam

5. Admission decision number: 1142/QĐ-CTSV Dated: December, 28th, 2011   

6. Changes in academic process: 2 year extension (2015, 2016)

7. Official thesis title: Research, design and fabrication of the sattelite receiver with auto-detection and auto-tracking mechanism used for satellite communication systems Vinasat.

8. Major:   Electronics Engineering                                             9. Code: 62 52 02 03

10. Supervisors: Prof. Dr. Bach Gia Duong

11. Summary of the new findings of the thesis:

The contents of the thesis were presented in three chapters and followed the target. The main contributor results of the thesis include two contents:

- Based on the study of tracking algorithms and antenna control system, the results of the thesis have proposed using open-loop tracking and search algorithms. It allows to identify the exact elevation angle and azimuth angle of the receive antenna through the location of the ground station and the position of the satellite in the orbit. The thesis proposed using the open-loop algorithm combined with the step tracking algorithm to improve the efficiency of satellite tracking. Besides, the thesis also studies, proposes solutions to design and fabricate the antenna control systems to apply proposed algorithms. The experimental results show that the antenna control system tracks stability satellite with tracking time is less than 0.5s. These results were published in the article [4], [5].

- Based on the study of microwave circuit design, the second content of the thesis has proposed design solutions of C-band low noise block downconverter and L-band receiver which has high sensitivity, large dynamic range and bandwidth, high gain. Proposals include: Amplifier design uses negative feedback and optimal parameters of a transistor to design low noise amplifier; Design solution uses a two-stage amplifier with the different frequency center to increase bandwidth, the gain of the amplifier. To increase stability of the received signal, design also has applied microstrip circuits, integrated circuits and phase lock loop to produce local oscillator with high stability, band pass filter to meet the requirements of satellite receivers. The results were the design and manufacture of low noise block down converter C-band and L-Band receiver with  parameters: Sensitivity is -113 dBm with signal-to-noise ratio = 1.5 and sensitivity is -115 dBm with signal-to-noise ratio = 1, bandwidth is 1.2GHz, dynamic range is about 61 dB. These results were published in the papers [1] - [3], [6], [7].

12. Practical applicability, if any:

The thesis is applicable in practice because the contents of research, design, manufacture of low noise block down converter C-band and L-Band satellite receiver is one of the contents of the research VT/CN 03/13-15 belongs to the Space Science and Technology Program 2013-2015: "Design and fabrication of mobile satellite receivers based on high-sensitivity field sensing applied on board" head of research Prof. Dr. Nguyen Huu Duc - Hanoi University of Technology, Vietnam National University.

13. Further research directions, if any:

Research and propose solutions to design, fabrication of Ku-band satellite receiver applied for tracking control systems on the Ku band.

Research and propose solutions to design, fabrication of the lighter tracking control systems applied for different purposes.

14. Thesis-related publications:

- Tran Van Hoi, Bach Gia Duong (2013), ’’Study and design of wide band low noise amplifier operating at C band’’, Journal of Mathematics – Physics, Vietnam National University, Hanoi, Vol. 29 (2), pp.16-24.

- Tran Van Hoi, Hoang Duc Long, Bach Gia Duong (2013), ’’Low noise block downconverter design for satellite receiver system Vinasat 1 operating at C-band’’, Proceedings of the2013 IEICE International Conference on Intergrated Circuits, Design, and Verification, pp.110-115.

- Tran Van Hoi, Bach Gia Duong (2013), ’’Designing Wideband Microstrip Bandpass Filter for Satellite Receiver Systems’’, Proceedings of theNational Conference on Electronics and Communications (REV2013-KC01), pp.140-143.

- Tran Van Hoi, Nguyen Xuan Truong, Bach Gia Duong (2015), “Satellite Tracking Control System Using Fuzzy PID Controller”, Journal of Mathematics – Physics, Vietnam National University, Hanoi, Vol. 31 (1), pp. 36-46.

- Tran Van Hoi, Nguyen Xuan Truong, Bach Gia Duong (2015), “Improvement of step-tracking algorithm used for mobile receiver system via satellite”, International Journal of Electrical and Computer Engineering, Scopus Index, Vol. 5 (2), pp. 280 – 288.

- Tran Van Hoi, Nguyen Xuan Truong, Ngo Thi Lanh, Bach Gia Duong (2016), “Design of a C-Band Low-Noise Block Front-end for Satellite Receivers”, International Journal of Applied Engineering Research, Scopus Index, Vol. 11 (8), pp. 5646-5652.

- Tran Van Hoi, Ngo Thi Lanh, Nguyen Xuan Truong, Nguyen Huu Duc, Bach Gia Duong (2016), “Design of a Front-end for Satellite Receiver”, International Journal of Electrical and Computer Engineering, Scopus Index, Vol. 6 (5), pp. 2282 - 2290.