Extraction of Optimum PWM Levels in LORAN Switching Transmitter for Ground-Based Positioning System

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Khorrami A.; AFIFI A.; GHEZEL AYAGH M.H.; AMIN A.R.

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Journal: Advanced Defense Science and Technology Year:2020 | Volume:10 | Issue:4 Page(s): 351-360

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Title

Extraction of Optimum PWM Levels in LORAN Switching Transmitter for Ground-Based Positioning System

Author(s)

Khorrami A. | AFIFI A. | GHEZEL AYAGH M.H. | AMIN A.R. | Issue Writer Certificate

Keywords

Local Positioning System (LPS)Q1

Multi-level PWMQ1

LORAN SignalQ1

NavigationQ1

Class-D AmplifierQ1

Abstract

Long-Range-Navigation (LORAN) pulse generator is an essential part of ground-based Local Positioning System (LPS) that provide a specific standard waveform. There are several solutions for design and implementation of the pulse generator. Switching amplifiers using Pulse-Width-Modulation (PWM) technique is one of the solutions that can be used for this purpose. In this paper, the simple PWM was modified to a Multi-level PWM and its optimum levels are extracted to provide a high power LORAN transmitter. Multi-level PWM provides essential standards of LORAN pulse waveform. In order to provide a transmitter with 1MW power, three-to-eleven levels of PWM using 16 Class D amplifiers has been considered. At constant conditions, such as power and number of amplifier modules, the requirements and specifications of transmitter have been simulated. Simulation results show that in the best case, using eleven levels for PWM, the maximum zero crossing error in the 4th to 12th half-cycle is 16. 6 ns and the bandwidth of provided pulse is 5 kHz. Moreover, MMSE and maximum error of peak points in the first eight half-cycles are 0. 009 and 0. 021 respectively, which are appropriate standards of a LORAN transmitter.

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APA: Copy

Khorrami, A., AFIFI, A., GHEZEL AYAGH, M.H., & AMIN, A.R.. (2020). Extraction of Optimum PWM Levels in LORAN Switching Transmitter for Ground-Based Positioning System. (JOURNAL OF ADVANCED DEFENCE SCIENCE AND TECHNOLOGY) JOURNAL OF PASSIVE DEFENCE SCIENCE AND TECHNOLOGY, 10(4 ), 351-360. SID. https://sid.ir/paper/167537/en

Vancouver: Copy

Khorrami A., AFIFI A., GHEZEL AYAGH M.H., AMIN A.R.. Extraction of Optimum PWM Levels in LORAN Switching Transmitter for Ground-Based Positioning System. (JOURNAL OF ADVANCED DEFENCE SCIENCE AND TECHNOLOGY) JOURNAL OF PASSIVE DEFENCE SCIENCE AND TECHNOLOGY[Internet]. 2020;10(4 ):351-360. Available from: https://sid.ir/paper/167537/en

IEEE: Copy

A. Khorrami, A. AFIFI, M.H. GHEZEL AYAGH, and A.R. AMIN, “Extraction of Optimum PWM Levels in LORAN Switching Transmitter for Ground-Based Positioning System,” (JOURNAL OF ADVANCED DEFENCE SCIENCE AND TECHNOLOGY) JOURNAL OF PASSIVE DEFENCE SCIENCE AND TECHNOLOGY, vol. 10, no. 4 , pp. 351–360, 2020, [Online]. Available: https://sid.ir/paper/167537/en

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