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ALGORITMA PERINGATAN DINI PENCURIAN IKAN PADA DATA AUTOMATIC IDENTIFICATION SYSTEM (AIS) BERBASIS TERESTRIAL DAN SATELIT (ILLEGAL FISHING EARLY WARNING ALGORITHM FOR TERESTRIAL AND SATELLITE-BASED AUTOMATIC IDENTIFICATION SYSTEM (AIS) DATA) Emir Mauludi Husni; Muhammad Riksa Andanawari R. S; Robertus Heru Triharjanto
Jurnal Teknologi Dirgantara Vol. 14 No. 2 Desember 2016
Publisher : National Institute of Aeronautics and Space - LAPAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.jtd.2016.v14.a2385

Abstract

Illegal fishing has created heavy financial losses for Indonesia, meanwhile, the large Indonesian water territory made it very difficult to detect such activities. The international regulation that obligates all ships above 300 GT to transmit data using AIS provide opportunity to detect ships conducting illegal fishing. The capability of Indonesia to detect AIS signals from LAPAN-A2/Orari satellite enhances such opportunity. The objective of the research is to develop part of the illegal fishing early warning system, based on AIS data received by terrestrial and satellite sensors. The detection is done by analyzing the course of the ships. Types of illegal fishing activities to be detected are trans-shipment, trawl usage, fishing zone violation, reporting avoidance, and AIS is switching off. The algorithm used is Ray Casting method to determine whether a ship is in its designated zone. The improvement of performance of the algorithm is done by multithreading on the used Phyton code. The algorithm is tested using AIS data from LAPAN-A2 and simulated AIS data.  The results show that the algorithm designed for the analysis of illegal fishing early warning system using AIS data is successfully in detecting six types of offenses in accordance with the Ministry of Marine Affairs and Fisheries Republic of Indonesia mentioned above by using simulation data. Abstrak Pencurian ikan merupakan kegiatan yang menyebabkan kerugian sangat besar untuk Indonesia, sementara wilayah perairan Indonesia yang luas membuat kegiatan pengawasan pencurian ikan tersebut menjadi sulit dilakukan. Peraturan internasional yang mewajibkan setiap kapal di atas 300 GT untuk mengirimkan data menggunakan AIS menjadi kesempatan untuk mendeteksi kapal-kapal yang melakukan pencurian ikan. Kemampuan Indonesia untuk mendeteksi sinyal AIS dari satelit LAPAN-A2/Orari memperbesar kesempatan tersebut. Penelitian ini bertujuan membangun bagian dari sistem peringatan dini aktivitas pencurian ikan, berdasarkan data AIS yang diterima oleh sensor di garis pantai dan di satelit. Proses pendeteksian dilakukan dengan menganalisa data perjalanan dari sistem AIS. Jenis-jenis pencurian ikan yang dapat dideteksi oleh algoritma ini adalah trans-shipment, penggunaan pukat harimau, pelanggaran zona teritorial, pelanggaran tidak melapor, pelanggaran wilayah penangkapan, dan pelanggaran tidak mengaktifkan pemancar sinyal AIS. Algoritma yang digunakan adalah metode Ray Casting, untuk menentukan suatu kapal berada dalam satu wilayah atau tidak. Perbaikan performa algoritma ini dilakukan dengan melakukan proses multithreading menggunakan kode Python. Algoritma diuji dengan data AIS dari LAPAN-A2/Orari dan data simulasi. Hasil menunjukkan bahwa algoritma yang dirancang untuk sistem analisis peringatan dini pencurian ikan (illegal fishing) dengan data AIS berhasil mendeteksi 6 jenis pelanggaran sesuai ketentuan Kementerian Kelautan dan Perikanan (KKP) Republik Indonesia yang telah disebutkan di atas dengan menggunakan data simulasi.
PICO-SATELLITE DETUMBLING SIMULATION USING MAGNETIC ATITUDE ACTUATOR (SIMULASI DETUMBLING PADA SATELIT PIKO MENGGUNAKAN AKTUATOR SIKAP MAGNETIK) Ali Muksin; Ridanto Eko Poetro; Robertus Heru Triharjanto
Jurnal Teknologi Dirgantara Vol. 15 No. 1 Juni 2017
Publisher : National Institute of Aeronautics and Space - LAPAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.jtd.2017.v15.a2524

Abstract

One of the methods to control Nano/pico-satellite’s attitude is using magneto-torquers as attitude actuators. ITB, at the moment is planning to develop a cubesat. Therefore, the objective of the research was to investigate the performance of such attitude control system for 3U class cubesat. The research used Matlab/simulink-based satellite simulator developed by LAPAN and ITB, and B-dot control law. The advantages of the method are that the actuators are small and lighter compared to the other type of actuators, such as momentum wheels or reaction wheels. However, the disadvantages is that the torques can be created only when the actuator oriented at non-zero angle with local magnetic field. The results showed that the attitude control system could performed the detumbling operation, with the best transient time at about two orbits period. Varying the gain parameter in the controller may result into variation of transient time and even unstability.   AbstrakSalah satu cara untuk mengendalikan sikap satelit nano/piko adalah dengan menggunakan magneto-torquer sebagai aktuator. Saat ini ITB tengah mewacanakan pengembangan cubesat, sehinggga tujuan dari penelitian ini adalah untuk mengevaluasi kinerja sistem kendali sikap berdasarkan medan magnet Bumi pada cubesat kelas 3U. Penelitian ini menggunakan simulator satelit berbasis MATLAB/simulink yang dikembangkan oleh LAPAN dan ITB, moda kendalinya berbasis hukum kendali b-dot. Keuntungan dari sistem kendali ini adalah ukuran dan beratnya yang kecil, dibandingkan dengan moda kendali lain, seperti momentum wheel atau reaction wheel. Sementara kerugiannya adalah hanya bisa menghasilkan torsi saat aktuator mempunyai sudut tidak nol dengan medan magnet Bumi. Hasil menunjukkan bahwa moda kendali tersebut dapat melakukan manuver de-tumbling, dengan waktu transient terbaik mendekati dua periode orbit. Juga ditunjukkan bahwa variasi waktu transient dan ketidakstabilan dapat diperoleh dengan memvariasikan parameter gain pada kontroler. 
ANALISIS PERBANDINGAN SISTEM SENJATA MULTI-LAYERED UNTUK PERTAHANAN UDARA KOTA DALAM PERANG MODERN Iman, Khoerozadi Faizal; Robertus Heru Triharjanto; Heri Budi Wibowo; Yayat Ruyat
International Journal Of Humanities Education and Social Sciences (IJHESS) Vol 3 No 3 (2023): IJHESS DECEMBER 2023
Publisher : CV. AFDIFAL MAJU BERKAH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55227/ijhess.v3i3.720

Abstract

In the era of modern warfare, urban defense is a very important aspect to maintain the security and stability of a country. Because modern war is a non-military war in which developed countries and foreign countries try to destroy a country through ideological, political, social, cultural and security defense. To protect the territory with effective air defense, it takes a strong and sophisticated defense resources with a reliable range of surveillance and agility to destroy any effort that threatens the security and sovereignty of the country. To achieve the objective of building a more efficient air defense system and functioning alongside other air defense platforms, new ideas and thinking are needed for program planning and the requirements of medium-range missile systems when building an air defense system. The research method used in this research is descriptive qualitative through a literature study. In the literature review, it is necessary to conduct a thorough search to ensure that the literature sources used are truly relevant to the research topic and a comparative analysis approach is used. In the realm of analyzing layered weapon systems, such as Hisar O, Hisar A, Korkut Gun System, Iron Dome, and NASAMS, it becomes imperative to delve into the comparative analysis and interpret the implications of their similarities and differences. Hisar O, a sophisticated air defense system, showcases advanced capabilities designed to counter aerial threats. Its cutting-edge technology and robust infrastructure provide a formidable defense mechanism. On the other hand, Hisar A, another component of the layered defense, excels in short-range air defense, ensuring effective protection against low-altitude aerial targets. Korkut Gun System, presents a unique blend of artillery and air defense capabilities. Its adaptable nature allows it to provide ground forces with enhanced protection against a wide range of threats. Iron Dome system has gained international recognition for its exceptional performance in countering short-range rocket threats. This innovative system incorporates advanced tracking and interception technologies, enabling it to neutralize incoming projectiles with a high success rate. NASAMS (Nationals Advanced Surface-to-Air Missile System) stands out as a versatile air defense solution. Its state-of-the-art radar and missile technologies ensure reliable protection against a variety of airborne threats, including aircraft, helicopters, and unmanned aerial vehicles (UAVs). Now, let's delve into the implications of these comparative analyses for Indonesia. By understanding the strengths and weaknesses of each system, Indonesian defense strategists can make informed decisions regarding their defense capabilities. This analysis assists in identifying potential gaps in the country's air defense network and formulating strategies to address them effectively. In conclusion, through a comparative analysis of layered weapon systems such as Hisar O, Hisar A, Korkut Gun System, Iron Dome, and NASAMS, we gain valuable insights into their capabilities and implications. evaluating differences and similarities, can help Indonesian defense planners make informed decisions to strengthen city air defense systems in the modern warfare.
Sebuah Analisis Perkembangan Desain Muzzle Brake Pada SL Rifle 41 Muhammad Alief Ramadhana; Heri Budi Wibowo; Robertus Heru Triharjanto; Lutfi Adin Affandi; Donny Haryogi Ramadhan
International Journal Of Humanities Education and Social Sciences (IJHESS) Vol 3 No 4 (2024): IJHESS FEBRUARY 2024
Publisher : CV. AFDIFAL MAJU BERKAH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55227/ijhess.v3i4.780

Abstract

The research explores advancements in muzzle brake designs for lightweight rifle firearms, aiming to control recoil during firing. The SL Rifle 41 from World War II serves as a historical example, highlighting challenges such as gas escaping near the muzzle, rapid cooling, and piston fouling. The gas expansion difference between the barrel and piston poses operational issues. The firearm shooting process involves high-temperature, high-pressure propellant gas released through the muzzle brake, creating a complex 3D instability problem. The shockwave from the muzzle blast significantly impacts the muzzle brake surface. Modern SL Rifle designers seek to enhance projectile muzzle velocity and After-Action Gas Powder (AAPG) simultaneously, addressing recoil energy through opposing impulses. The research employs a literature review method, analyzing concepts, theories, and findings. The SL Rifle's operational mechanism uses a direct gas impingement system, offering simplicity but accumulating carbon particles. Muzzle brake models feature a primary body and baffles strategically designed for gas dispersion and recoil reduction. Detailed examination of brake muzzle/barrel material objects and established muzzle brake models illustrates engineering considerations, enhancing understanding of design and characteristics. The comprehensive design aims to optimize performance, durability, and shooting stability while minimizing wear associated with carbon buildup. In conclusion, the evolution of muzzle brake design contributes to enhanced firearm performance, ensuring smoother firing, reduced recoil, increased accuracy, and control. Ongoing advancements cater to diverse user needs in military, law enforcement, and civilian contexts, reflecting a commitment to improving firearm technology.
ANALISIS AERODINAMIKA PADA SIRIP LIPAT ROKET ARTILERI KALIBER 300 MM Ahmad Novi Muslimin; Robertus Heru Triharjanto; Yayat Ruyat
ELEMEN : JURNAL TEKNIK MESIN Vol. 10 No. 1 (2023)
Publisher : POLITALA PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34128/je.v10i1.223

Abstract

Aerodynamic analysis is an important part of the rocket design process. In this study, the analysis was carried out on the design of the 300 mm diametres artillery rocket fins. The rocket was developed to replace the TNI AD MLRS rocket, which is currently an imported product, so the geometry of the MLRS launch tube is a design limitation, and the rocket fins must be able to fold before launch. Aerodynamic analysis was carried out using the RASAero II flight speed Mach 2.0 application. Variations in the dimensions of the fins used in this study were: the length of the front and rear edges of the fins with variations in the size of 10, 30, and 50 mm, the thickness of the base of the fins with variations in the size of 5, 10 and 15 mm. The simulation results show that the folding fin size 50T5R has a drag force of 145 N and a lifting force of 1081 N, a fin with an optimal design. Based on natural frequency analysis, fins with sizes 10T5R, 10T10R, 30T5R, 30T10R, 50T5R, and 50T10R are fins with structural values safe from vibrational resonance.