Filters








20 Hits in 9.8 sec

The Lunar Mini-RF Radars: Hybrid Polarimetric Architecture and Initial Results

R K Raney, P D Spudis, B Bussey, J Crusan, J R Jensen, W Marinelli, P McKerracher, C Neish, M Palsetia, R Schulze, H B Sequeira, H Winters
2011 Proceedings of the IEEE  
| The two mini-radio-frequency (mini-RF) radars flown in near-polar lunar orbits (on Chandrayaan-1 and the Lunar Reconnaissance Orbiter) were the first of their kind, hybrid-polarimetric.  ...  Data quality and instrument characteristics suggest that hybrid polarity is highly desirable for future exploratory radar missions in the Solar system.  ...  .: The Lunar Mini-RF Radars: Hybrid Polarimetric Architecture and Initial Results Fig. 7 . 7 Comparison of TWTA and MPM technologies.  ... 
doi:10.1109/jproc.2010.2084970 fatcat:buwkgli7nzbklalri7zd3vn4wy

Initial observations of lunar impact melts and ejecta flows with the Mini-RF radar

Lynn M. Carter, Catherine D. Neish, D. B. J. Bussey, Paul D. Spudis, G. Wesley Patterson, Joshua T. Cahill, R. Keith Raney
2012 Journal of Geophysical Research  
Winters (2011), 581 The Lunar Mini-RF Radars: Hybrid Polarimetric Architecture and Initial Results, Proc IEEE, 582 99, doi: 10.1109/JPROC.2010.2084970, 808-823. 583 584 Robinson, M.  ...  of Mini-RF, and are mapped to the lunar coordinate grid with a 132 resolution of 15 m/pixel.  ... 
doi:10.1029/2011je003911 fatcat:b33weovrercvhgzonle2iea7c4

Hybrid Dual-Polarization Synthetic Aperture Radar

R. Keith Raney
2019 Remote Sensing  
Hybrid dual-polarimetric imaging radars were in the payloads of two lunar-orbiting satellites, India's Earth-observing RISAT-1, and Japan's ALOS-2.  ...  The results verify that the performance accuracy of the HCP architecture is comparable to the accuracy delivered by a quadrature-polarized SAR.  ...  Figure 1 . 1 Examples of lunar impact crater polarimetric images as seen from the Arecibo Observatory (a) and an m-chi classification of hybrid dual-polarized data (b) from the Mini-RF radar aboard LRO  ... 
doi:10.3390/rs11131521 fatcat:7a37rhoudvgifhdemga5fpfbby

Antenna Cross-Polarization Isolation and Calibration of Hybrid-Polarization Radars

Thomas J. Miller, Ozlem Kilic, Mark S. Mirotznik
2013 IEEE Antennas and Wireless Propagation Letters  
Experimental results show the validity of the radar model and antenna measurement technique.  ...  This letter presents an experiment using a fully polarimetric hybrid-polarization (CL-pol) radar that employs separate spiral antennas for transmit of the orthogonal circular polarizations and operates  ...  System [3] and polarization decomposition models [6] for prior examples of CL-pol radars, the mini-radio frequency (mini-RF) radars of the Chandrayaan-1, and the Lunar Reconnaissance Orbiter (LRO)  ... 
doi:10.1109/lawp.2013.2282251 fatcat:vcef6zssljemfnbejzwackfq2u

Unravelling the Mystery of Lunar Anomalous Craters Using Radar and Infrared Observations

Wenzhe Fa, Vincent R. Eke
2018 Journal of Geophysical Research - Planets  
To resolve this controversy, we have systematically analyzed >4,000 impact craters with diameters between 2.5 and 24 km in the Mini-RF radar image and Diviner rock abundance (RA) map.  ...  We first constructed two controlled orthorectified global mosaics using 6,818 tracks of Mini-RF raw data and then analyzed the correlations between radar CPR and surface slope, RA, and depth/diameter ratios  ...  The authors gratefully acknowledge NASA PDS Geosciences Node for providing Mini-RF, Diviner RA, and LOLA topography data.  ... 
doi:10.1029/2018je005668 fatcat:ezkneie6mze7lc5tdnldbba6we

Chandrayaan-2 Dual-Frequency SAR (DFSAR): Performance Characterization and Initial Results [article]

Sriram S. Bhiravarasu, Tathagata Chakraborty, Deepak Putrevu, Dharmendra K. Pandey, Anup K. Das, V. M. Ramanujam, Raghav Mehra, Parikshit Parasher, Krishna M. Agrawal, Shubham Gupta, Gaurav S. Seth, Amit Shukla (+5 others)
2021 arXiv   pre-print
The resulting data from DFSAR support calculation of the 2×2 complex scattering matrix for each resolution cell, which enables lunar near surface characterization in terms of radar polarization properties  ...  Our initial results show that craters in both permanently shadowed regions (PSRs) and non-PSRs that are classified as Circular Polarization Ratio (CPR)-anomalous in previous S-band radar analyses appear  ...  , qualification and operations.  ... 
arXiv:2104.14259v1 fatcat:56gr3uvhvzagtbnvm652id3sy4

Impact Ejecta Characterization for Small-Sized Fresh and Degraded Lunar Craters Using Radar Data

Ami J. Desai, Shiv Mohan, Sripada V. S. Murty
2016 Current Science  
Using data from Mini RF instrument on-board NASA's Lunar Reconnaissance Orbiter, four Stokes parameters that differentiate and describe the observed backscattered electromagnetic field are calculated.  ...  We use the first Stokes parameter to investigate and estimate the spatial ejecta distribution for 98 small-sized fresh and degraded craters from mare and highland regions.  ...  Ejecta extent measurements Mini-RF on-board LRO utilizes new wideband hybrid polarization architecture to measure Stokes parameters of the reflected signal 22 .  ... 
doi:10.18520/cs/v110/i10/1929-1938 fatcat:qy4hyn4puvh23eoebqiyirqwb4

Evidence for water ice on the Moon: Results for anomalous polar craters from the LRO Mini-RF imaging radar

P. D. Spudis, D. B. J. Bussey, S. M. Baloga, J. T. S. Cahill, L. S. Glaze, G. W. Patterson, R. K. Raney, T. W. Thompson, B. J. Thomson, E. A. Ustinov
2013 Journal of Geophysical Research - Planets  
1] The Mini-RF radar instrument on the Lunar Reconnaissance Orbiter spacecraft mapped both lunar poles in two different RF wavelengths (complete mapping at 12.6 cm S-band and partial mapping at 4.2 cm  ...  D., et al. (2013), Evidence for water ice on the Moon: Results for anomalous polar craters from the LRO Mini-RF imaging radar,  ...  Crusan) for initially funding the Mini-RF project and for critical support at several points in our long journey back to the Moon.  ... 
doi:10.1002/jgre.20156 fatcat:aixcnll4zjacpenuddfillub5u

Geologic Studies of Planetary Surfaces Using Radar Polarimetric Imaging

L M Carter, D B Campbell, B A Campbell
2011 Proceedings of the IEEE  
Recent polarimetric imaging using Arecibo has included Venus and the Moon.  ...  For example, polarimetric radar studies of volcanic settings on Venus, the Moon, and Earth display some similarities, but also illustrate a variety of different emplacement and erosion mechanisms.  ...  Acknowledgment The authors would like to thank the staff of the Arecibo and Green Bank Observatories for their help with the observations discussed in this paper. Three anonymous reviewers and N. J.  ... 
doi:10.1109/jproc.2010.2099090 fatcat:sgu25reywfc2jas5vum34xjgce

Polarimetric Portraits

R. Keith Raney
2021 Earth and Space Science  
The suggested terminology is applicable to a variety of disciplines, including radiometry, alternative polarimetric radar architectures, radar astronomy, weather radar, and GPS/GNSS reflectometry.  ...  Polarimetric portraits obtained by dual-polarized and quadrature-polarized radars are shown to be equal. RANEY  ...  The LRO's Mini-RF in orbit at the Moon received signals reflected from the lunar surface in response to circularly polarized transmissions from Arecibo, Puerto Rico.  ... 
doi:10.1029/2021ea001768 fatcat:6kslbaupp5bnvhq223lbgw4wgu

EVALUATION OF HYBRID POLARIMETRIC DECOMPOSITION TECHNIQUES FOR WINTER CROP DISCRIMINATION

Sanid Chirakkal, Dipanwita Haldar, Arundhati Misra
2017 Progress In Electromagnetics Research M  
In this paper we compare, using ISRO's RISAT-1 FRS-1 mode Compact Polarimetric (CL-Pol) data, two widely used hybrid polarimetric decomposition techniques, m − δ and m − χ decompositions, with regard to  ...  We show that the classification based on the m − χ decomposition results in better crop separability in general.  ...  ACKNOWLEDGMENT This work is carried out with the data from RISAT data Utilization programme and authors are grateful to Dr. Manab Chakraborty, Project Director, RISAT-UP.  ... 
doi:10.2528/pierm17011603 fatcat:ybdaqln55jhnnmbpsvdvocobcy

Hybrid Compact Polarimetric SAR for Environmental Monitoring with the RADARSAT Constellation Mission

Brian Brisco, Masoud Mahdianpari, Fariba Mohammadimanesh
2020 Remote Sensing  
The primary image data products from an HCP radar are different from those of a traditional polarimetric radar.  ...  Thus, HCP data can be considered as dual-pol data, while the resulting polarimetric classifications of features in an observed scene are of comparable accuracy as those derived from the traditional fully  ...  Acknowledgments: The authors would like to thank Francois Charbonneau for a critical review that helped improve the manuscript and Keith Raney for many helpful inputs, comments and reviews.  ... 
doi:10.3390/rs12203283 fatcat:brqrgjbvwnbm7pe7qxwk6j77ba

LRO observations of morphology and surface roughness of volcanic cones and lobate lava flows in the Marius Hills

Samuel J. Lawrence, Julie D. Stopar, B. Ray Hawke, Benjamin T. Greenhagen, Joshua T. S. Cahill, Joshua L. Bandfield, Bradley L. Jolliff, Brett W. Denevi, Mark S. Robinson, Timothy D. Glotch, D. Benjamin J. Bussey, Paul D. Spudis (+2 others)
2013 Journal of Geophysical Research - Planets  
Comparisons between LROC NAC block populations, Mini-RF data, and Diviner-derived rock abundances confirm that blocky lava flows comprise the domes of the Marius Hills. 8 mm features measured by Diviner  ...  1] The volcanic domes, cones, sinuous rilles, and pyroclastic deposits of the Marius Hills region of the Moon (~13.4 N, 304.6 E) represent a significant episode of magmatic activity at or near the lunar  ...  The hard work and dedication of the LROC Science Operations Center team are gratefully acknowledged. This work was funded by the NASA Lunar Reconnaissance Orbiter project.  ... 
doi:10.1002/jgre.20060 fatcat:5yeg5f6tpjegxhw64usqmbd464

Hybrid Compact Polarimetric SAR Calibration Considering the Amplitude and Phase Coefficients Inconsistency

Wentao Hou, Fengjun Zhao, Xiuqing Liu, Dacheng Liu, Yonghui Han, Yao Gao, Robert Wang
2022 Remote Sensing  
Calibration using corner reflectors is an effective way to estimate the distortion parameters of hybrid compact polarimetric (HCP) synthetic aperture radar (SAR) systems.  ...  Simulation results show that both schemes can eliminate the influence of the inconsistency of amplitude and phase coefficients, and estimate distortion parameters accurately.  ...  polarimetric SAR data.  ... 
doi:10.3390/rs14020416 fatcat:wodxgtswxfbehojgfk5sacwd4a

Conference Digest

2020 2020 IEEE Aerospace Conference  
The Auxiliary Payload Sensor Suite (APSS), a collection of environmental sensors carried by the Interior exploration using Seismic Investigations, Geodesy, and Heat Transport (InSight) lander, is capable  ...  of measuring Martian air temperature, wind speed, atmospheric pressure, and local magnetic fields.  ...  The selection will be made in November 2019. The initial MSR architecture called for a hybrid-based propulsion MAV.  ... 
doi:10.1109/aero47225.2020.9172613 fatcat:ioqf5ijrx5gvffu3ls34aa2nsq
« Previous Showing results 1 — 15 out of 20 results