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All Journal Seminar Nasional Aplikasi Teknologi Informasi (SNATI) Proceedings of KNASTIK Semantik Teknika: Jurnal Sains dan Teknologi Seminar Nasional Informatika (SEMNASIF) Jurnal Teknologi Dirgantara Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII Indonesian Journal of Aerospace
Sri Kliwati
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Aerospace Engineering Astronomy Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Transportation Other

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PENINGKATAN REOLUSI PERHITUNGAN FREKUENSI GELOMBANG SINUS MENGGUNAKAN FFT (IMPROVING CALCULATION RESOLUTION OF SINE WAVE FREQUENCY USING FFT) Sri Kliwati
Jurnal Teknologi Dirgantara Vol.13 No. 1 Juni 2015
Publisher : National Institute of Aeronautics and Space - LAPAN

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Abstract

Perhitungan perubahan frekuensi sinyal sinus sangat penting untuk aplikasipada intrumentasi. Seperti pada sistem Doppler yang juga memerlukan perhitunganfrekuensi keluaran berupa gelombang sinus. Tulisan ini membahas peningkatanresolusi perhitungan perubahan frekuensi gelombang sinus berbasis algoritma FastFourier Transform (FFT). Penambahan waktu sampling data dapat meningkatkanresolusi frekuensi dengan signifikan, tetapi sampling data menjadi lebih rendah. Padaaplikasi frekuensi Doppler 440 MHz resolusi kecepatan sekitar 6.8 m/detik dengansampling data 10 Hz. Resolusi dan sampling data ini harus disesuaikan dengankecepatan dan durasi terbang roket agar optimal dalam pengukurannyaKata kunci: Resolusi frekuensi, gelombang sinus, FFT.
ALGORITMA DETEKSI FREKUENSI DTMF MENGGUNAKAN KORELASI SILANG UNTUK TELEKOMANDO WAHANA TERBANG (DTMF FREQUENCY DETECTION ALGORITHM USING CROSSCORRELATION FOR VEHICLE TELECOMMAND) Sri Kliwati
Jurnal Teknologi Dirgantara Vol. 14 No. 1 Juni 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.a2942

Abstract

In general, the frequency DTMF detection algorithm using FFT (Fast Fourier Transform) and Goertzel Algorithm. However, in certain circumstances a more suitable signal detected by the other algorithms. For example in a non-periodic signal as the measurement sensors for flight vehicle. The purpose of this study is to develop a system telecommand for flight vehicle. And this paper discusses the frequency DTMF (Dual Tone Multi Frequency) detection method using cross correlation algorithm and data-base DTMF. The simulation results show the frequency detection successfully carried out in accordance with the accuracy of the data-base created (1 Hz) to change the frequency of zero to 1700 Hz (DTMF frequency limit). ABSTRAKDeteksi frekuensi DTMF secara umum menggunakan algoritma Fast Fourier Transform (FFT) dan Goertzel Algorithm. Akan tetapi pada kondisi tertentu sebuah sinyal lebih cocok dideteksi dengan algoritma yang lain. Misalnya pada sinyal yang non-periodik seperti pada pengukuran sensor-sensor wahana terbang. Tujuan penelitian ini adalah membangun sistem telekomando untuk wahana terbang. Dan tulisan ini membahas metode deteksi frekuensi Dual Tone Multi Frequency (DTMF) dengan menggunakan algoritma korelasi silang dan data-base DTMF. Hasil simulasi menunjukkan deteksi frekuensi berhasil dilakukan sesuai dengan akurasi database yang dibuat (1 Hz) untuk perubahan frekuensi antara nol hingga 1700 Hz (batas frekuensi DTMF).
RANCANGAN DAN ANALISA ANTENA DI PERMUKAAN BADAN ROKET Sri Kliwati; Wahyu Widada
Jurnal Teknologi Dirgantara Vol 2, No.1 Juni (2004)
Publisher : National Institute of Aeronautics and Space - LAPAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.jtd.2004.v2.a791

Abstract

The antenna telemetry is usually placed in the body of LAPAN rocket for the launching campaign, which affected to the quality of radio communication. Especially, such effect increas the antenna overshadow to the surface of body rocket, which not influenced to the aerodynamic of rocket. This antenna was made by using the PCB plate with size of 1 cm width and 1 per 2 also 1 per 4 length for the frequency of 900 MHz
ON-BOARD FUNDAMENTAL FREQUENCY ESTIMATION OF ROCKET FLIGHT EXPERIMENTS USING DSP MICROCONTROLLER AND ACCELEROMETER Agus Harno Nurdin Syah; Sri Kliwati; Wahyu Widada
Jurnal Teknologi Dirgantara Vol 7, No.1 Juni (2009)
Publisher : National Institute of Aeronautics and Space - LAPAN

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Abstract

Fundamental frequency vibrasi roket pada saat terbang sangat penting diukur untuk pengembangan sistem elektronik maupun mekanik muatan roket. Tulisan ini membahas metode pengukuran fundamental frekuensi tersebut dengan menggunakan sensor accelerometer dan 32 bit DSP (Digital Signal Processor) microcontroller. CPU ini digunakan untuk akuisisi data dan perhitungan algoritma DFT (Discrete Fourier Transform) serta algoritma penentuan frekuensi fundamentalnya. Deteksi fundamental frekuensi berbasis envelope (lowpass filter) spektrum frekuensi. Sistem yang telah dibuat dapat dikombinasikan dengan radio modem untuk pengiriman data dengan kecepatan serta sampling rate yang cukup tinggi. Maksimum frekuensi yang dapat diestimasi hingga 2 kHz, cukup untuk parameter roket.
PENGEMBANGAN DETEKTOR SIGNAL RADIO MULTI CHANNEL UNTUK RADIO TRACKING ROKET MENGGUNAKAN LOGARITMIK AMPLIFIER Satria G. Zain; Adi Susanto; Thomas Sri Widodo; Wahyu Widada; Sri Kliwati
Jurnal Teknologi Dirgantara Vol 6, No.2 Desember (2008)
Publisher : National Institute of Aeronautics and Space - LAPAN

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Abstract

Pengukuran kuat signal radio telemetri roket sangat penting dilakukan untuk mengetahui hubungan kualitas signal dan data yang diterima. Power meter ini juga dapat diaplikasikan untuk deteksi perubahan sudut elevasi dan azimuth trayektori roket dengan menggunakan array antena yagi yang telah dikembangkan metodenya. Power meter radio mempunyai rentang pengukuran yang sempit, sehingga terjadi saturasi untuk pengukuran radio dengan power yang cukup besar. Tulisan ini membahas desain dan pengembangan power detektor untuk mendeteksi signal radio pada sistem telemetri roket dengan maksimum pengukutan 1 watt dan dapat diubah sesuai dengan kebutuhan. Signal power meter ini berbasis logarithmic amplifier dengan lebar band sampai dengan 100 db dengan ketelitian 0.02 dB.
IMPLEMENTASI 3D GAME ENGINE SEBAGAI VISUALISASI SISTEM NAVIGASI 6-DOF PADA ROKET KENDALI LAPAN [3D GAME ENGINE IMPLEMENTATION AS 6-DOF NAVIGATION SYSTEM VISUALIZATION AT GUIDED ROCKET OF LAPAN] Romi Wiryadinata; Wildan Yusuf; Ri Munarto; Frandi A. Kaharjito; Sri Kliwati
Jurnal Teknologi Dirgantara Vol.10 No.2 Desember 2012
Publisher : National Institute of Aeronautics and Space - LAPAN

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Abstract

Game engine, which are often used by game developers, has software framework that facilitates their work on important tasks such as graphic design or 3D and 2D graphics rendering. This research uses game engine called 3D state game engine for visualize 6-DOF navigation system. The software is developed for visualize range of motion of the object by reading and processing the streaming data from navigation sensor (accelerometers and rate-gyroscope). The test result show that developed software can visualize the motion of the objects in 3D animation. Software can accept and process the data as text file that is transmited in real-time through serial port. IMU hardware with sofware can use through the calibration process first, and be given a filter, so that the better results can be obtained. Key word: 3D Game Engine, Graphical User Interface, IMU, 6-DOF
PENERAPAN LOW PASS FILTER UNTUK MEMPERBAIKI HASIL ESTIMASI SUDUT PADA SISTEM RADIO TRACKING ROKET Satria Gunawan Zain; Adhi Susanto; Thomas Sri Widodo; Sri Kliwati; Wahyu Widada
Jurnal Teknologi Dirgantara Vol. 8 No.1 Juni 2010
Publisher : National Institute of Aeronautics and Space - LAPAN

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Abstract

Radio tracking system can be applied to track the position of a rocket and is potential to be developed to replace the GPS technology. This system is used to estimate the direction angle (azimuth and elevation) of transmitter source. In measurement and trial there are many noises that cause the results of angle estimation are not accurate. These noises can be obsreved from the value of the angle estimation varied for a fixed measurement point. This is caused by the interference on the received sinyal. This paper discusses the application of low pass filter to eliminate noises in the radio receiver system. Experiment results show that the variation of estimates angle becomes 1600 times smaller compared to the one without filter
METODE KALIBRASI TIME DIFFERENT OF ARRIVAL TDOA UNTUK SISTEM PASSIVE RADAR TRAYEKTORI ROKET Wahyu Widada; Sri Kliwati
Jurnal Teknologi Dirgantara Vol 5, No.2 Desember (2007)
Publisher : National Institute of Aeronautics and Space - LAPAN

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Abstract

Design passive ranging base on radio with Time Different of Arrival TDOA (passive RADAR) have been developed for the application of tracking rocket trajectory. Calibration of the passive RADAR can be done in launching site for obtaining optimal position, however it is also require to be done in laboratory for testing the system algorithm. This article describes the calibration method of time delay calculation in laboratory using antenna cable with various of lengths. We obtain an accurate correlation results between time delay from measurement of oscilloscope and calculation TDOA with cross-correlation method. This method is practical and effective for calibration system in the development of passive RADAR. Keywords: TDOA, Passive RADAR, Trajectory rocket, Calibration method, Cross-correlation.
SIMULASI PERFORMA MOTOR ROKET BERTINGKAT sri kliwati; Haris Setyawan; Wahyu Widada
Retii Prosiding Seminar Nasional ReTII Ke-14 2019
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

ABSTRACT This paper discusses the simulation of rocket motor performance for prediction of flight test result. Flying performance targets, such as range, altitude, speed can be predicted by simulation to predict flight test from static test results of rocket motors and for rocket motor design. Starting with Matlab software with the main data input power of rocket motor, output obtained in the form of flight test data (range, altitude, speed, and acceleration). The results of this software can be used for multi-stage motor, so it is useful to design a rocket motor in order to meet the range for satellite orbiter. Keyword : simulation, rocket, performance
Static and dynamic GPS receiver verification tests using software defined radio Kliwati, Sri; Wiryadinata, Romi; Muttakin, Imamul; Setyawan, Haris; Rustamaji, Rustamaji; Widada, Wahyu
Jurnal Teknika Vol 20, No 1 (2024): Available Online in June 2024
Publisher : Faculty of Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/tjst.v20i1.22637

Abstract

Global Positioning System (GPS) is widely used in a variety of fields, including aircraft applications and rockets where speeds exceed standards. Signal simulators, which are relatively expensive, are required to test commercial GPS devices and GPS signal processing methods. The methodology for verifying GPS receiver specifications using a Software Defined Radio (SDR)-based simulator is described in this paper. Simulator tests are run in both static and dynamic modes. The test findings demonstrate that the system can measure altitude and speed, but only up to 50 km and 500 m/s, respectively, according to commercial GPS specifications. This simulator system can be used to evaluate future GPS processing algorithms in highly dynamic environments.
Co-Authors Adhi Susanto Adhi Susanto Adi Susanto Adi Susanto Agus Harno Nurdin Syah Frandi A. Kaharjito Haris Setyawan Imamul Muttakin Ri Munarto romi wiryadinata Romi Wiryadinata Rustamaji, Rustamaji Satria G. Zain Satria Gunawan Zain Satria Gunawan Zain Setyawan, Haris Syah, Agus Harno Nurdin Thomas Sri Widodo Thomas Sri Widodo Wahyu Widada Wahyu Widada Wahyu Widada Wahyu Widada Wahyu Widada Widada, Wahyu Wildan Yusuf Zain, Satria G.