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All Journal International Journal of Electrical and Computer Engineering IAES International Journal of Artificial Intelligence (IJ-AI) Transmisi: Jurnal Ilmiah Teknik Elektro Mechatronics, Electrical Power, and Vehicular Technology Jurnal INKOM Jurnal Elektronika dan Telekomunikasi
Purwoko Adhi
Research Center for Electronics and Telecommunication, Indonesian Institute of Sciences, Kampus LIPI, Jl. Sangkuriang, Gd. 20, Bandung 40135
Computer Science & IT Education Electrical & Electronics Engineering Engineering

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Radar Penembus Dinding UWB-FMCW 500-3000 MHz Wijaya, R. Indra; Adhi, Purwoko; Hercuadi, Asep Yudi; Muliawandana, Dadan; Sariningrum, Ros
Jurnal Elektronika dan Telekomunikasi Vol 14, No 1 (2014)
Publisher : Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1004.136 KB) | DOI: 10.14203/jet.v14.1-7

Abstract

Radar penembus dinding memiliki potensi untuk dapat digunakan dalam penanganan pasca bencana dan gangguan keamanan.Tulisan ini membahas hasil perancangan dan pembuatan sistem Radar Penembus Dinding Ultra Wide Band Frequency Modulated Continous Wave (UWB-FMCW) yang digunakan untuk mendeteksi keberadaan suatu objek di balik dinding. Dalam penelitian ini dikembangkan pembangkit chirp UWB menggunakan kombinasi DDS dan VCO sebagai komponen utama pembangkit gelombang FMCW untuk mendapatkan linearitas yang tinggi, merealisasikan tranceiver dalam arsitektur homodyne, mengembangkan modul akuisisi, serta merealisasikan perangkat lunak untuk melakukan pengolahan sinyal dan menampilkannya dalam bentuk citra secara real time menggunakan MS Visual C++. Sistem radar penembus dinding didesain untuk memiliki resolusi 6 cm dan jarak tidak ambigu 30 m, pada rentang pita frekuensi kerja 500 - 3000 MHz. Dari hasil pengujian dalam skala laboratorium radar ini mampu melakukan identifikasi objek dibalik dinding yang terbuat dari kayu setebal 3 cm pada jarak 4 m dan menampilkannya dalam bentuk citra A-Scan dan B-Scan secara real time.
Design and Development of a Control System for Nanofiber Electrospinning Kurniawan, Dayat; Adhi, Purwoko; Nasir, Muhammad
Journal of Mechatronics, Electrical Power and Vehicular Technology Vol 4, No 2 (2013)
Publisher : Research Centre for Electrical Power and Mechatronics, Indonesian Istitutes of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1404.817 KB) | DOI: 10.14203/j.mev.2013.v4.65-74

Abstract

This paper describes the development of a control hardware and software for a nano-fiber electro-spinning system. The hardware consists of motor driver boards, a high DC voltage board, and a main control board. The user interface software on PC is developed using Visual Studio C # 2010 express edition. The motor driver boards are controlled by an ATmega8 microcontroller IC, while the main board is controlled by an ATmega 128 microcontroller IC. Communication between the main board and the motor driver boards uses the inter integrated circuit (I2C), while communication between PC and the main board uses a serial communication at a baud rate of 9,600 bps. The high DC voltage generator is designed to have an output of 0-25 kV. High DC voltage output is configurable by giving a combination of low logic and high impedance into a six bit input. The result show that maximum output of high DC voltage is 25.025 kV with formula of curve is y = 1x – 0.0244 with R2 = 0.9998 and PC software interface can work very well. Polymer flow rate can be configured from PC interface software via I2C connected to the main board. The flow rate y follows the RPM setting x, according to the formula y = 0.954x – 0.0099 with R2 = 1. The results of scanning electron microscope (SEM) for morphology analysis of PVDF copolymer composite nano-fiber shows that the average diameter of the resulted fiber is 136.43 nm, when output high DC voltage is set to 15 kV and speed of syringe pump is set to 5 RPM.  
Exciter Jammer Berbasis Direct Digital Synthesizer Suardja, Elan Djaelani; Adhi, Purwoko
INKOM Journal Vol 7, No 2 (2013)
Publisher : Pusat Penelitian Informatika - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (11946.215 KB) | DOI: 10.14203/j.inkom.257

Abstract

In this paper, we propose a radio transmitter jamming device modification developed. The transmitter is built by replacing Voltage Controled Oscillator (VCO) with modules for Direct Digital Synthesizer (DDS) as an exciter. Advantages of DDS is programmed with a computer and can produce a signal with a frequency stability and frequency accuracy is very high. The use of DDS allow setting the frequency of central and deviation with very easily using software. In addition, the period or sweep time designed to use only software can be reprogrammed with DDS to function on a Linear Sweep No Dwell mode and signaltrigger with a period equal to the period the minimum desired sweep. DDS allows to generate a signal jamming by narrow BW, so the power output of the Jammer could be higher and increased outreach of radio jamming. Another advantage with theuse of DDS is the dimension transmitter Jammer becomes smaller.keywords: Jamming devices, DDS, Eletronics warfare Pada tulisan ini, modifikasi perangkat pemancar radio jamming diusulkan, dengan mengganti Voltage Controled Oscilator (VCO) dengan modul Direct Digital Synthesizer (DDS) sebagai exciter. Kelebihan DDS adalah bisa diprogram dengan komputer dan menghasilkan sinyal dengan stabilitas dan akurasi frekuensi yang sangat tinggi. Penggunaan DDS memungkinkan pengaturan frekuensi tengah dan deviasi dengan sangat mudah menggunakan sofware. Di samping itu, periode atau waktu sweep dirancang untuk bisa diatur hanya menggunakan software dengan memprogram DDS untuk berfungsi pada mode Linear Sweep No Dwell dan memberikan sinyal trigger dengan periode sebesar periode sweep minimum yang diinginkan. DDS memungkinkan untuk menghasilkan sinyal jamming dengn BW yang sempit, sehingga power output Jammer bisa lebih tinggi dan daya jangkau radio jamming meningkat. Keuntungan lain dengan penggunaan DDS adalah dimensi pemancar Jammer menjadi lebih kecil.kata kunci: Perangkat Jamming, DDS, Perang elektronik
Akuisisi Data Sederhana untuk Radar FM-CW Purwoko, Adhi
INKOM Journal Vol 5, No 2 (2011)
Publisher : Pusat Penelitian Informatika - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (371.295 KB) | DOI: 10.14203/j.inkom.119

Abstract

This paper describes the development of a simple data acquisition modul for FM-CW radar. The modul is design to be integrated in a through wall radar system using UWB and FM-CW technologies for life detector application.  It uses a CY7C68013A, an EZ-USB family IC, from Cypress Semiconductor which is operated in slave FIFO mode. A Max II CPLD IC EPM1270T144  from  Altera is used as a FIFO master. While for ADC, an AD9235 from  Analog Devices is used. The modul is used to convert analog beat signal into digital data at a sampling rate of 1Msample/s and a resolution of  12 bit per sample.
ANALISIS KINERJA RF POWER AMPLIFIER PADA FREKUENSI 3 GHz UNTUK APLIKASI RADAR CC-OFDM-MIMO Mukti, Prasetiyono Hari; Wikantyoso, A Krisna; Wibowo, Reyhan Adinathan; Kuswidiastuti, Devy; Hendrantoro, Gamantyo; Wahyu, Yuyu; Adhi, Purwoko
Transmisi: Jurnal Ilmiah Teknik Elektro Vol 26, No 1 Januari (2024): TRANSMISI: Jurnal Ilmiah Teknik Elektro
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/transmisi.26.1.10-16

Abstract

Indonesia sebagai negara kepulauan yang sangat luas memerlukan sebuah teknologi pengawasan yang dapat memantau pergerakan objek di wilayah kedaulatan Indonesia, baik itu wilayah darat, laut, maupun udara. Salah satu teknologi yang digunakan adalah sistem radar. Berbagai teknologi radar telah dikembangkan, dari mulai radar konvensional hingga modern. Terkini, telah diusulkan sebuah teknologi baru yang dapat menjadi kandidat untuk meningkatkan kinerja radar AESA, yaitu Radar berbasis CC-OFDM-MIMO. Hanya saja, teknologi ini masih dalam tahap pembuktian konsep, sehingga perlu pengujian lebih lanjut dalam bentuk prototipe. Salah satu komponen yang perlu dikembangkan dalam prototipe radar CC-OFDM-MIMO ini adalah modul Power Amplifier. Sehingga, pada makalah ini, kami membahas pengembangan modul Power Amplifier yang dirancang menggunakan komponen komersial. Selain karena biaya produksi yang murah, pengembangan dari komponen komersial ini juga untuk turut meningkatkan kemampuan dalam negeri dalam merancangan komponen/modul gelombang mikro. Modul Power Amplifier ini dilengkapi dengan Automatic Load Switching yang berfungsi untuk mengatur mekanisme switching pada Power Amplifier berdasarkan mode Radar yang digunakan. Karena proses fabrikasi yang masih memerlukan waktu lama, pada makalah ini modul Power Amplifier yang dikembangkan diverifikasi secara numerik terhadap parameter kinerja return loss, gain, titik kompresi P1dB, dan titik perkalian intermodulasi orde 3 (IP3). Dari hasil pengujian tersebut, diperoleh hasil bahwa modul power amplifier yang dikembangkan memiliki gain sebesar 14.5dB, OP1dB sebesar 28.5 dBm, saturasi pada daya output 30.5 dBm, dan bekerja pada frekuensi 3GHz untuk implementasi sistem penguat pada model radar CC-OFDM-MIMO. 
Improved autocorrelation method for time synchronization in filtered orthogonal frequency division multiplexing Suyoto, Suyoto; Subekti, Agus; Satyawan, Arief Suryadi; Marta Dinata, Mochamad Mardi; Mitayani, Arumjeni; Adhi, Purwoko
International Journal of Electrical and Computer Engineering (IJECE) Vol 13, No 6: December 2023
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijece.v13i6.pp6538-6546

Abstract

Time synchronization is essential in multicarrier systems such as filtered orthogonal frequency division multiplexing (F-OFDM) because it determines the whole system’s performance. Differ with OFDM, where subcarrier allocation is not flexible. In F-OFDM, the subcarrier allocation is more flexible, and the whole subcarrier in one symbol can be grouped into several subbands. The use of subcarriers that are limited to only one subband can reduce the performance of time synchronization based on autocorrelation (AC) methods. In this study, we first compare the performance of the AC-based time synchronization algorithms used in F-OFDM when training symbols are limited to one subband. Secondly, we made improvements to the AC-based time synchronization with the averaging technique of its timing metric, thus increasing the accuracy of time estimates in the F-OFDM system. The averaging technique of the timing metric improved the performance of the AC method in cases where the training symbol is limited to one subband, as shown in the simulation results.
Autonomous radar interference detection and mitigation using neural network and signal decomposition Kurniawan, Dayat; Rohman, Budiman Putra Asmaur; Indrawijaya, Ratna; Wael, Chaeriah Bin Ali; Suyoto, Suyoto; Adhi, Purwoko; Firmansyah, Iman
IAES International Journal of Artificial Intelligence (IJ-AI) Vol 13, No 3: September 2024
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijai.v13.i3.pp2854-2861

Abstract

Autonomous radar interference is a challenging problem in autonomous vehicle systems. Interference signals can decrease the signal-to-interference-noise ratio (SINR), and this condition decreases the performance detection of autonomous radar. This paper exploits a neural network and signal decomposition to detect and mitigate radar interference in autonomous vehicle applications. A neural network (NN) with four inputs, one hidden layer, and one output is trained with various signal-to-noise (SNR), interference radar bandwidth, and sweep time of autonomous radar. Four inputs of NN represent SNR, mean, total harmonic distortion (THD), and root means square (RMS) of the received radar signal. Variational mode decomposition (VMD) and zeroing based on a constant false alarm rate (CFAR-Z) are used to mitigate radar interference. VMD algorithm is applied to decompose interference signals into multi-frequency sub-band. As a result, the proposed neural network can detect radar interference, and NN-VMD-CFAR-Z can increase SINR up to 2dB higher than the NN-CFAR-Z algorithm.
Co-Authors Agus Subekti Arumjeni Mitayani Asep Yudi Hercuadi, Asep Yudi Budiman Putra Asmaur Rohman Dayat Kurniawan Devy Kuswidiastuti Elan Djaelani Suardja Gamantyo Hendrantoro Iman Firmansyah Indrawijaya, Ratna Marta Dinata, Mochamad Mardi Muliawandana, Dadan Prasetiyono Hari Mukti Sariningrum, Ros Satyawan, Arief Suryadi Siti Helmyati Solly Aryza Wael, Chaeriah Bin Ali Wibowo, Reyhan Adinathan Wijaya, R. Indra Wikantyoso, A Krisna Yuyu Wahyu