Article Per Year (5 Year)
p-Index From 2020 - 2025
0.61
P-Index
This Author published in this journals
All Journal ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Indonesian Journal of Aerospace
KURNIAWAN, FAROHAJI
Unknown Affiliation
Aerospace Engineering Astronomy Electrical & Electronics Engineering Engineering

Published : 3 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 3 Documents
Search

 1 
Rancang Bangun Matched Mixer sebagai Komponen Penyusun IQ Mixer pada Aplikasi Synthetic Aperture Radar RUHIYAT, ABDURRASYID; KURNIAWAN, FAROHAJI; APRIONO, CATUR
ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Vol 12, No 3: Published July 2024
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/elkomika.v12i3.716

Abstract

ABSTRAKIQ Mixer adalah komponen yang penting pada subsistem RF Synthtetic Aperture Radar (SAR) karena berperan untuk melakukan proses Single Side Band (SSB) modulation antara sinyal qudrature base chirp (IF) dengan sinyal carrier (LO), sehingga mampu menurunkan beban kerja Field Programmable Gate Arrays (FPGA) dan meningkatkan resolusi sistem SAR. IQ Mixer tersusun dari satu Quadrature LO Phase Shifter, dua Matched Mixer dan satu Power Combiner-Splitter. Pada penelitian ini dipaparkan mengenai perancangan Matched Mixer yang dibuat dengan menggunakan anti-phase coupler dan konfigurasi double balanced mixer. Anti-phase coupler yang digunakan merupakan modifikasi dari qudrature coupler dengan tujuan untuk menghindari interferensi karena adanya saluran transmisi yang saling menyilang. Hasil pengukuran menunjukkan bahwa anti-phase coupler memiliki nilai phase unbalance dibawah 1°, amplitude unbalance dibawah 0,6 dB dan untuk double balanced mixer memiliki nilai conversion loss (CL) sebesar 9,58 dB.Kata kunci: Coupler, Matched Mixer, IQ Mixer, Synthetic Aperture Radar ABSTRACTIQ Mixer is an important component in the RF Synthetic Aperture Radar (SAR) subsystem that plays a role in carrying out the single side band modulation process between the quadrature base chirp (IF) signal and the carrier (LO) signal, thereby reducing the workload of the Field Programmable Gate Arrays (FPGA) and increasing the resolution of SAR systems. IQ Mixer is composed of a Quadrature LO Phase Shifter, two Matched Mixers, and a Power Combiner-splitter. This research describes the process of designing a matched mixer, which is made using an anti-phase coupler and a double-balanced mixer configuration. The anti-phase coupler is a modified version of the quadrature coupler to avoid interference due to crossing transmission lines. The measurement results show that the anti-phase coupler has a phase unbalance value below 1°, an amplitude unbalance below 0.6 dB, and the double-balanced mixer has a conversion loss value of 9.58 dB. Keywords: Coupler, Matched Mixer, IQ Mixer, Synthetic Aperture Radar
Polarimetric Calibration for Ground-based Synthetic Aperture Radar based on Point Target Approach CHASANAH, NURUL; GUNAWAN, DADANG; KURNIAWAN, FAROHAJI; WIYONO, AGUS; ABNER, JEFRI; SETIADI, BAMBANG
ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Vol 12, No 4: Published October 2024
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/elkomika.v12i4.968

Abstract

ABSTRAKKalibrasi polarimetri (PolCal) dari citra radar aperture sintetis berbasis darat (GB SAR) sangat penting dalam aplikasi analisis spasial empiris. Studi ini menyajikan prosedur pra-pemrosesan dan metode kalibrasi untuk memperoleh citra kompleks polarisasi tunggal dengan kualitas tinggi yang terkalibrasi. Pemrosesan data GB SAR menjadi citra kompleks tunggal diterapkan dalam riset ini. Penelitian ini bertujuan untuk menerapkan kalibrasi polarimetri eksternal pada radar gelombang kontinu frekuensi bertahap (SFCW) di pita frekuensi C yang dihasilkan oleh perangkat VNA menggunakan satu trihedral dan dua dihedral CR dengan sudut kemiringan yang berbeda. Setelah pra-pemrosesan, teknik kalibrasi yang diterapkan menunjukkan ketidakseimbangan saluran antara saluran polarisasi yang berbeda (co-pol and cross-pol) dapat diatasi dengan baik.Kata kunci: Kalibrasi Polarimetri, Radar Apertur Sintetis Berbasis Darat (GB SAR), Ketidakseimbangan Saluran ABSTRACTPolarimetric calibration (PolCal) of ground-based synthetic aperture radar (GB SAR) images is critical in empirical spatial analysis applications. This study provides the preprocessing procedures and calibration method required for obtaining highquality calibrated polarimetric single-look complex imagery. The technique of converting GB SAR data into single-look complex images is examined. This work aimed to perform an external polarimetric calibration of the C-band steppedfrequency continuous wave (SFCW) radar produced by VNA employing single trihedral and two dihedral CRs with varying tilt angles. After preprocessing, the calibration technique profoundly enhances channel imbalance between different polarization channels (co-pol and cross-pol).Keywords: Polarimetric Calibration, Ground-based synthetic aperture radar (GB SAR), Channel Imbalance
Implementation of Backprojection Algorithm for Synthetic Aperture Radar Image Processing on Low-Cost Hardware Platform Agus Wiyono; Chasanah, Nurul; Abner Hamonangan, Jefri; Ruhiyat, Abdurrasyid; Rohman, Abdul; Kurniawan, Farohaji; Muksin; Arief Aditya, Satria; Hendra Wahyudi, Agus; Rahayu, Novelita; Arisal, Andria; Setiadi, Bambang
Indonesian Journal of Aerospace Vol. 21 No. 2 (2023): Indonesian Journal Of Aerospace
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/ijoa.2023.2516

Abstract

This work presents the implementation of back-projection algorithm for Synthetic-Aperture Radar (SAR) signals on a low-cost, small, lightweight, and low-power consumption platform: Raspberry Pi. The algorithm is implemented with GNU Octave open-source software and the performance was tested on Raspberry Pi 3B and 4 hardware. For performance comparison, a single-threaded baseline implementation of back-projection is created and then modified to run on several threads on an available multicore processor. Executing a single-threaded code Raspberry PI is too slow for real-time imaging. However, the parallelized version shows computation improvement over the baseline version. We include a discussion of parallel implementation on a single Pi using Octave’s parallel package. This study contributes to the understanding of implementing SAR image processing on affordable single-board platforms with constrained computing resources.
Co-Authors Abdul Rohman Abner Hamonangan, Jefri ABNER, JEFRI Agus Wiyono Andria Arisal, Andria Arief Aditya, Satria Bambang Setiadi Catur Apriono Dadang Gunawan Hendra Wahyudi, Agus Muksin Nurul Chasanah Rahayu, Novelita RUHIYAT, ABDURRASYID