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L band

About: L band is a research topic. Over the lifetime, 674 publications have been published within this topic receiving 4570 citations.


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Proceedings ArticleDOI
17 Jul 2022
TL;DR: In this article , a multi-frequency SAR scene was evaluated for classification purposes of successional forest stages in Eastern Amazon, where the backscattering intensity, polarimetric features, interferometric coherence, and texture attributes were considered as input data into the random forest classification algorithm.
Abstract: Multi-frequency SAR scenes were evaluated for classification purposes of successional forest stages in Eastern Amazon. Advanced Land-Observing Satellite (ALOS) Phased Array L-band Synthetic Aperture Radar (PALSAR) data, RADARSAT-2 (C-Band), and TERRASAR-X (X-Band) data were used independently and combined in a dual SAR system approach. An image of the Advanced Land Imager (ALI) onboard the EO-1 was used as an additional ground reference and input dataset in the classification scheme. The backscattering intensity, polarimetric features, interferometric coherence, and texture attributes were considered as input data into the random forest (RF) classification algorithm. L-band data alone performed better than C- and X- bands alone but overall accuracies remained low. The addition of polarimetric features and texture at any frequency increase classification accuracies when compared to backscattering data alone. The best combination of two SAR systems were found when considering L-band with either C- or X- band. L-band also performed best when combined with optical data indicating a high potential to provide spatial information about successional forest stages.
Proceedings ArticleDOI
12 Oct 2015
TL;DR: The Advanced Land Observing Satellite-2 (ALOS-2) was launched from Tanegashima Space Center by H-IIA rocket successfully on 24th May 2014 as discussed by the authors.
Abstract: The Advanced Land Observing Satellite-2 (ALOS-2) was launched from Tanegashima Space Center by H-IIA rocket successfully on 24th May 2014. ALOS-2 carries the Phased Array type L-band Synthetic Aperture Radar-2 (PALSAR-2) as the state-of-the-art L-band SAR system which succeeds to PALSAR onboard ALOS. PALSAR-2 uses almost whole bandwidth allocated for L-band active sensor of Earth Exploration Satellites Service specified by the Radio Regulation in order to realize the high resolution observation, and also, it transmits more than 6 kW power for lower Noise Equivalent Sigma Zero using 180 TRMs driven by Gallium Nitride (GaN) amplifier which is the first use in space. Furthermore, because ALOS-2 carries the SAR system only, PALSAR-2 antenna can be mounted under the satellite body. It enables to observe right-/left-looking observation by satellite maneuvering. And the high accuracy orbit control to maintain the satellite within 500 m radius tube against the reference orbit enables high coherence for the InSAR processing. Using these new technologies, ALOS-2 has been operating to fulfill the mission requirements such as disaster monitoring and so on. This document introduces the initial result of ALOS-2 from the first year operation.
Journal ArticleDOI
TL;DR: In this paper, three different folded type meander line antennas have been proposed, one without conductor line and two with conductor line, and the performance of these antennas were investigated and it has been successfully demonstrated that insertion of conductor line makes the antenna a better resonator and also improves the return loss.
Abstract: In this paper folded type meander line antennas have been proposed. Performance of three different meander line antennas have been investigated, first one without conductor line and the other two with conductor line. First antenna is a triple band resonator while second antenna with conductor line becomes tetra band resonator and the last design is a dual band resonator but with higher return loss, -35 dB at 1.86 GHz. CST_STUDIO_2012 is being used for simulation. Far-field response, efficiency, gain, directivity and reflection coefficients have been chosen as factors for performance analysis and it has been successfully illustrated here that insertion of conductor line makes the antenna a better resonator and also improves the return loss. The proposed antennas in this paper work are able to operate in the LTE700, LTE/GSM1800, PCS/ UMTS/ WLAN/ LTE2400, L band (1-2 GHz) and S band (2-4 GHz).
Proceedings ArticleDOI
01 May 2022
TL;DR: In this article , the spectral gain measurement of an extended L-band EDFA performed using a saturation tone combined with a tunable signal was compared to the measurement done with an Lband comb source.
Abstract: We compare the spectral gain measurement of an extended L-band EDFA performed using a saturation tone combined with a tunable signal, to the measurement done with an L-band comb source. The optimum tone wavelength is investigated.
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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20232
202222
202134
202036
201944
201838