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All Journal IJITEE (International Journal of Information Technology and Electrical Engineering) Mars: Jurnal Teknik Mesin, Industri, Elektro dan Ilmu Komputer
Ahmad Nugroho Jati
Universitas Gadjah Mada
Computer Science & IT Electrical & Electronics Engineering

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A High-Frequency Surface Wave Radar Simulation Using FMCW Technique for Ship Detection Ahmad Nugroho Jati; Ahmad Fauzi Haqqoni; Iswandi Iswandi; Risanuri Hidayat
IJITEE (International Journal of Information Technology and Electrical Engineering) Vol 4, No 1 (2020): March 2020
Publisher : Department of Electrical Engineering and Information Technology,Faculty of Engineering UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijitee.56344

Abstract

Indonesia is an archipelagic country with a vast sea area. This vast sea area becomes a challenge in conducting regional surveillance to maintain maritime conditions. The use of buoys and satellites still has shortcomings in carrying out surveillance despite its excellent surveillance capabilities. A high-frequency radar technology with 3-30 MHz frequency and surface wave propagation are very suitable because it has a radar range that can cross the horizon or commonly refer to as Over the Horizon (OTH). The Frequency Modulated Continuous Wave (FMCW) technique on this radar obtains distance and velocity information by a continuously transmitted frequency modulation. The use of radar in Indonesia for marine surveillance is still infrequent. Therefore, it is relatively difficult to conduct testing and obtain data. In addition, the direct examination requires extended time, so a simulation program is needed. This paper discusses the design of a High-Frequency Surface Wave Radar (HFSWR) simulation program using FMCW modulation technique. The simulation program detected two objects based on time delays due to the distance and velocity of the object with a maximum range of 350 km. It displayed the results in an informative manner. The object detection was based on the results of the Fast Fourier Transform (FFT) from the mixed signals. The mixed signal is a combination of transmitted signal and reflected signal in which there are time delay components due to the object. The simulation program had been tested with input values of distance and velocity that vary, both for one object and two objects, in the radial direction. It generated output that was close to the input value with a level of accuracy of ± 2 km.
Pendekatan Dan Metode Spectrum Sensing Dalam Tinjauan Literatur Rahardian Luthfi Prasetyo; Ahmad Nugroho Jati; I Made Adhi Wiryawan; Muhammad Ibkar Azki Himmawan
Mars : Jurnal Teknik Mesin, Industri, Elektro Dan Ilmu Komputer Vol. 2 No. 4 (2024): Agustus : Mars : Jurnal Teknik Mesin, Industri, Elektro Dan Ilmu Komputer
Publisher : Asosiasi Riset Teknik Elektro dan Informatika Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/mars.v2i4.236

Abstract

Pemanfaatan spektrum gelombang radio telah meningkat pesat dalam beberapa dekade terakhir, namun tidak sejalan dengan ketersediaan frekuensi yang tersedia untuk pengguna. Fenomena ini diperparah oleh banyaknya pita frekuensi yang tidak digunakan oleh pemiliknya, yang menciptakan spectrum holes atau white spaces. Dalam konteks ini, teknologi Cognitive radio (CR) menjadi penting karena memungkinkan pengguna sekunder (secondary user) untuk mengakses dan menggunakan spectrum holes tanpa mengganggu pengguna primer (primary user). CR memungkinkan adaptabilitas perangkat radio dengan memanfaatkan cognitive cycle, dengan tahap utamanya adalah Spectrum sensing, di mana perangkat CR mencari spectrum holes dalam spektrum radio yang tersedia. Tahap berikutnya, Spectrum analysis dan Spectrum Decision, memungkinkan CR untuk mengoptimalkan penggunaan spektrum sesuai dengan kondisi yang ditemui. Paper ini bertujuan untuk melakukan tinjauan singkat terhadap implementasi CR, khususnya pada aspek spectrum sensing. Kami mengevaluasi berbagai teknik spectrum sensing, mengidentifikasi kelebihan, kekurangan, serta tantangan yang dihadapi. Dengan teknologi CR, pemborosan sumber daya spektrum dapat diminimalkan dan efisiensi komunikasi nirkabel dapat ditingkatkan. Paper ini memberikan pemahaman mendalam tentang pengembangan terbaru dalam spectrum sensing pada jaringan radio kognitif, serta memberikan panduan bagi penelitian dan implementasi di masa depan.
Co-Authors Ahmad Fauzi Haqqoni I Made Adhi Wiryawan Iswandi Muhammad Ibkar Azki Himmawan Rahardian Luthfi Prasetyo Risanuri Hidayat