scholarly journals Design of Dual Band Microstrip Antenna at L-Band and S-Band Frequencies for Synthetic Aperture Radar (SAR) Sensors

2018 ◽  
Vol 10 (1) ◽  
Author(s):  
Binarti Fauziah Fitriani ◽  
Heroe Wijanto ◽  
Agus Dwi Prasetyo
Keyword(s):  
Synthetic Aperture Radar ◽  
Return Loss ◽  
Synthetic Aperture ◽  
Dual Band ◽  
Dual Band Antenna ◽  
Penetration Ability ◽  
L Band ◽  
Dual Band Antennas ◽  
Patch Technique ◽  
Aperture Radar

SAR (Synthetic Aperture Radar) is a remote sensing system using radar for high resolution image capture. The use of different frequency bands on SAR, will result different effect of image. The higher frequency used, the higher resolution of resulting image. The lower frequency used, the higher penetration ability. Therefore, using dual band antenna on the SAR system can improve the data collection and information of the target, also reduce its size. This study designs dual band antennas at 1.27 GHz (L-Band) and 3 GHz (S-Band) frequencies. To obtain the characteristics, the antenna is designed by slotted patch technique and using proximity coupled feeding. As a result, by using dielectric FR4 Epoxy with relative permittivity 4,6, the antenna working at frequency 1.27 GHz with return loss -25.131 dB, VSWR 1.1201, and bandwidth (return loss ? -10 dB) 19.9 MHz. While at 3 GHz work frequency return ross is -16.802 dB, VSWR 1.3381, and bandwidth (return loss ? -10 dB) 125.3 MHz.

scholarly journals FILTER BAND PASS MIKROSTRIP DENGAN STEPPED IMPEDANCE RESONATOR (SIR) UNTUK SYNTHETIC APERTURE RADAR (SAR) L-BAND

2018 ◽  
Vol 2 (2) ◽  
Author(s):  
Narulita Fubian ◽  
Heroe Wijanto ◽  
Desti Madya Saputri
Keyword(s):  
Synthetic Aperture Radar ◽  
Insertion Loss ◽  
Return Loss ◽  
Synthetic Aperture ◽  
Band Pass ◽  
L Band ◽  
Stepped Impedance Resonator ◽  
Aperture Radar

Filter pada teknologi synthetic aperture radar (SAR) digunakan untuk menghilangkan interferensi dan frekuensi lain yang tidak diinginkan pada saat modulasi. Hasil penginderaan yang baik dihasilkan oleh filter band pass yang dapat melewatkan frekuensi yang diinginkan dan memotong frekuensi yang tidak diharapkan. Oleh karena itu, pada penelitian ini filter dirancang dengan selektivitas yang tinggi, yakni pada frekuensi 1,27 GHz dengan lebar pita sebesar 10 MHz. Rancangan resonator yang digunakan adalah stepped impedance resonator (SIR) yang berbentuk ring kotak karena dapat menghasilkan lebar pita yang sempit. Bahan yang digunakan untuk implementasi filter ini adalah duroid RT-5880 dengan konstanta dielektrik 2,2. Hasil perancangan menunjukkan bahwa respon frekuensi pada 1,27 GHz memiliki nilai return loss (S11) -19,95 dB dan nilai insertion loss (S21) -0,97 dB. Untuk lebar pita pada rentang frekuensi 1,265-1,275 GHz didapatkan nilai S11 dan S21 secara berurutan sebedar -15,54 dB dan -0,99 dB serta -14,68 dB dan -1,09 dB.

scholarly journals Multi-Sensor InSAR Analysis of Progressive Land Subsidence over the Coastal City of Urayasu, Japan

2018 ◽  
Vol 10 (8) ◽  
pp. 1304 ◽  
Author(s):  
Yusupujiang Aimaiti ◽  
Fumio Yamazaki ◽  
Wen Liu
Keyword(s):  
Synthetic Aperture Radar ◽  
Survey Data ◽  
Land Subsidence ◽  
Ground Deformation ◽  
Tohoku Earthquake ◽  
Synthetic Aperture ◽  
Alos Palsar ◽  
The 2011 Tohoku Earthquake ◽  
L Band ◽  
Aperture Radar

In earthquake-prone areas, identifying patterns of ground deformation is important before they become latent risk factors. As one of the severely damaged areas due to the 2011 Tohoku earthquake in Japan, Urayasu City in Chiba Prefecture has been suffering from land subsidence as a part of its land was built by a massive land-fill project. To investigate the long-term land deformation patterns in Urayasu City, three sets of synthetic aperture radar (SAR) data acquired during 1993–2006 from European Remote Sensing satellites (ERS-1/-2 (C-band)), during 2006–2010 from the Phased Array L-band Synthetic Aperture Radar onboard the Advanced Land Observation Satellite (ALOS PALSAR (L-band)) and from 2014–2017 from the ALOS-2 PALSAR-2 (L-band) were processed by using multitemporal interferometric SAR (InSAR) techniques. Leveling survey data were also used to verify the accuracy of the InSAR-derived results. The results from the ERS-1/-2, ALOS PALSAR and ALOS-2 PALSAR-2 data processing showed continuing subsidence in several reclaimed areas of Urayasu City due to the integrated effects of numerous natural and anthropogenic processes. The maximum subsidence rate of the period from 1993 to 2006 was approximately 27 mm/year, while the periods from 2006 to 2010 and from 2014 to 2017 were approximately 30 and 18 mm/year, respectively. The quantitative validation results of the InSAR-derived deformation trend during the three observation periods are consistent with the leveling survey data measured from 1993 to 2017. Our results further demonstrate the advantages of InSAR measurements as an alternative to ground-based measurements for land subsidence monitoring in coastal reclaimed areas.

Monitoring Everglades freshwater marsh water level using L-band synthetic aperture radar backscatter

2014 ◽  
Vol 150 ◽  
pp. 66-81 ◽  
Author(s):  
Jin-Woo Kim ◽  
Zhong Lu ◽  
John W. Jones ◽  
C.K. Shum ◽  
Hyongki Lee ◽  
...  
Keyword(s):  
Synthetic Aperture Radar ◽  
Water Level ◽  
Freshwater Marsh ◽  
Synthetic Aperture ◽  
Radar Backscatter ◽  
L Band ◽  
Aperture Radar

scholarly journals Synthetic aperture radar (SAR)-based mapping of volcanic flows: Manam Island, Papua New Guinea

2004 ◽  
Vol 4 (2) ◽  
pp. 339-346 ◽  
Author(s):  
J. K. Weissel ◽  
K. R. Czuchlewski ◽  
Y. Kim
Keyword(s):  
Synthetic Aperture Radar ◽  
Papua New Guinea ◽  
Forest Cover ◽  
New Guinea ◽  
Pyroclastic Flows ◽  
Synthetic Aperture ◽  
Global Volcanism ◽  
L Band ◽  
Bare Surface ◽  
Aperture Radar

Abstract. We present new radar-based techniques for efficient identification of surface changes generated by lava and pyroclastic flows, and apply these to the 1996 eruption of Manam Volcano, Papua New Guinea. Polarimetric L- and P-band airborne synthetic aperture radar (SAR) data, along with a C-band DEM, were acquired over the volcano on 17 November 1996 during a major eruption sequence. The L-band data are analyzed for dominant scattering mechanisms on a per pixel basis using radar target decomposition techniques. A classification method is presented, and when applied to the L-band polarimetry, it readily distinguishes bare surfaces from forest cover over Manam volcano. In particular, the classification scheme identifies a post-1992 lava flow in NE Valley of Manam Island as a mainly bare surface and the underlying 1992 flow units as mainly vegetated surfaces. The Smithsonian's Global Volcanism Network reports allow us to speculate whether the bare surface is a flow dating from October or November in the early part of the late-1996 eruption sequence. This work shows that fully polarimetric SAR is sensitive to scattering mechanism changes caused by volcanic resurfacing processes such as lava and pyroclastic flows. By extension, this technique should also prove useful in mapping debris flows, ash deposits and volcanic landslides associated with major eruptions.

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