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All Journal Jurnal Teknologi Dirgantara SPEKTRAL : Journal of Communications, Antennas and Propagation
Rifki Ardinal
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Aerospace Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering Mechanical Engineering Physics

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APRS Data Receiver Using Raspberry Pi in LAPAN-A2 Satellite Sofian Rizal; Sonny Dwi Harsono; Suraduita Mupasanta; Rifki Ardinal
Spektral Vol. 2 No. 2 (2021): Oktober 2021
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/spektral.v2i2.4250

Abstract

Lapan-A2 Satellite, also known as LAPAN-ORARI, is the second satellite developed by the Indonesian National Institute of Aeronautics and Space (LAPAN) especially by Satellite Technology Center. This satellite was launched in 2015 which one of the payloads is for amateur radio communication such as VR (Voice Repeater) and APRS (Automatic Packet Reporting System). The APRS is a method of transmitting messages, status and positions using certain range of frequency and often used by Search and Rescue (SAR) team. Due to its function, APRS are not only used for disaster mitigation but also transmit various kind of data such as text message and weather information. In order to receive such information, APRS must be equipped with supporting devices. Formerly, APRS utilize terminal node controller and special hardware to decode its information but those technology is quite expensive. To address that challenge, this paper proposed an alternative way to decode the information send both from satellite APRS and terrestrial APRS by using raspberry Pi to replace those high-cost system.
PENGEMBANGAN ANTENA HELIKS QUADRIFILAR 2,22 GHZ UNTUK SATELIT MIKRO iwan faizal; irwan priyanto; rifki ardinal; suhata suhata
Jurnal Teknologi Dirgantara Vol. 17 No. 1 Juni 2019
Publisher : National Institute of Aeronautics and Space - LAPAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.jtd.2019.v17.a3116

Abstract

Bentuk dasar antena heliks quadrifilar dikembangkan oleh C. C. Kilgus dari Laboratorium Fisika Terapan, Universitas Johns Hopkins, USA. Antena ini memiliki beamwidth yang lebar sampai 2400 dengan pola radiasi berbentuk jantung, berpolarisasi sirkular dan tidak memerlukan reflektor. Antena heliks quadrifilar memiliki rasio diameter terhadap tingginya 0,66. Artinya antena ini ditempatkan di on-board satelit sebagai pemancar (Tx). Ukuran dari antena ini adalah ½ λ ½ putaran dan termasuk dalam varian putaran kecil. Tujuan dari riset ini adalah membuat prototip antena heliks quadrifilar dengan frekuensi 2,22 GHz dan selanjutnya diuji dalam skala laboratorium. Dari hasil pengujian laboratorium, besarnya RL adalah -18.55 dB, besarnya VSWR adalah 1,26, besarnya lebar pita adalah 6,04 %, besarnya lebar berkas adalah 1700 dan besarnya penguatan adalah 5,19 dB.
Co-Authors irwan priyanto iwan faizal Sofian Rizal Sonny Dwi Harsono suhata suhata Suraduita Mupasanta