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All Journal Journal Geuthee of Engineering and Energy International Journal of Wireless And Multimedia Communications
M. Aqsha Aqrizal
Politeknik Negeri Padang
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering

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AIS based vessel monitoring system using software defined radio M. Aqsha Aqrizal; Ummul Khair; Ratna Dewi
Journal Geuthee of Engineering and Energy Vol 5, No 1 (2026): Journal Geuthee of Engineering and Energy
Publisher : Geuthèë Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52626/joge.v5i1.71

Abstract

This study implements a low-cost Software Defined Radio (SDR)-based receiver system for the Automatic Identification System (AIS) operating at frequencies of 161.975 MHz and 162.025 MHz using a 44 cm V-dipole antenna with a 90° angle. Spectrum analysis is performed using Airspy to identify AIS signal characteristics in real time within the frequency domain, with measured Signal-to-Noise Ratio (SNR) values of 21.3 dB for AIS 1 and 21.4 dB for AIS 2. The signal decoding process is carried out by AIS-catcher, which handles GMSK demodulation and efficiently extracts AIS message payloads. The decoded data is then visualized using OpenCPN in the form of a digital map to monitor vessel positions and movements in real time. SDRangel is utilized as a supporting platform for signal observation, SDR device configuration, and additional analysis of reception quality. System performance evaluation demonstrates stable capability in receiving and decoding AIS signals with a satisfactory success rate, although it is still affected by interference and propagation conditions. GNU Radio is used in a limited capacity as a signal processing environment for filtering and basic parameter adjustment. The results confirm that low-cost SDR is an effective, flexible, and economical solution for implementing AIS monitoring systems at the research and basic application levels.
Comparative Analysis of Voice Call Service Quality Between CSFB and VoLTE Technologies M. Aqsha Aqrizal
International Journal of Wireless And Multimedia Communications Vol. 2 No. 1 (2025): International Journal of Wireless And Multimedia Communications
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62671/jowim.v2i1.81

Abstract

This study examines the performance of voice services using CSFB and VoLTE technologies. The quality of these services is evaluated using Key Performance Indicators (KPIs) from Drive Test results and key Quality of Service (QoS) metrics. Voice service quality is assessed through drive testing with Tems Pocket software. The findings reveal that CSFB technology involves a transition in Radio Access Technology (RAT) from LTE to GSM, whereas VoLTE operates without such transitions. In Indonesia, voice services without data primarily rely on both CSFB and VoLTE. The quality of these services is determined by factors such as RSRP and SINR, which affect the service’s accessibility, retention, and integrity. VoLTE, in particular, outperforms CSFB in terms of better throughput and reduced delay, enhancing overall service integrity.
Co-Authors Ratna Dewi Ummul Khair