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All Journal ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Indonesian Journal of Aerospace
RUHIYAT, ABDURRASYID
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Aerospace Engineering Astronomy Electrical & Electronics Engineering Engineering

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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
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 Agus Wiyono Andria Arisal, Andria Arief Aditya, Satria Bambang Setiadi Catur Apriono Hendra Wahyudi, Agus KURNIAWAN, FAROHAJI Muksin Nurul Chasanah Rahayu, Novelita