cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.48577/jpl.qbphre
title: Numerical and Experimental investigation of Heat Transfer in the Porous Media of an Additively Manufactured Evaporator of a Two-Phase Mechanically Pumped Loop for Space Applications

description: Two-phase pumped cooling systems are applied when it is required to maintain a very stable temperature for heat dissipation in a system. A novel additively manufactured evaporator for two-phase thermal control was developed at NASA Jet Propulsion Laboratory (JPL). The Two-Phase Mechanically Pumped Loop (2PMPL) allows to manage the heat transfer with much wider breadth of control authority compared to capillary-based systems, while alleviating the system sensitivity to pressure drops. The focus of this work is the understanding and capturing the micro-scale evaporation occurring in the porous structure of the evaporator. The Boiling and Phase Change Heat Transfer Laboratory at the University of California, Los Angeles (UCLA) developed an all-encompassing numerical simulation tool to predict the operational thermal behavior of the evaporator considering the effect of the liquid-vapor interface at the wick-to-vapor boundary. The numerical model incorporated the behaviour of the liquid-vapor meniscus at particle level located along the evaporative boundary between the wick structure and the vapor chamber. The numerical model allowed to study the effect of different parameters, such as boundary conditions, geometry, wick and fluid properties. An experimental setup was built at UCLA in order to characterize the heat transfer within an additively manufactured porous sample fabricated at JPL and in particular its evaporative heat load under certain heat inputs. The experimental efforts served as validation for the numerical results and aided in the characterization of the transient phenomena, such as dry-out.
DOI: 10.48577/jpl.xxve5c
title: The Journey of the Lunar Flashlight Propulsion System from Launch through End of Mission

description: The Lunar Flashlight Propulsion System (LFPS) was developed as a technology demonstration to enable the Lunar Flashlight spacecraft to reach Lunar orbit and to desaturate onboard reaction wheels. While the system produced over 16 m/s of delta-v and successfully managed momentum, variable thrust performance kept the spacecraft from reaching the Moon. This paper details the in-flight journey of the LFPS, highlighting both successes and challenges met throughout the mission, and provides lessons learned applicable to future CubeSat propulsion systems.
DOI: 10.48577/jpl.ys8r0k
title: A SYNOPTIC-SCALE COMPARISON OF SATELLITE YUKON RIVER MOUTH TEMPERATURE TO IN-SITU AND REANALYSIS DATA DURING 2003–2020

description: This paper combines remote sensing Sea Surface Temperature (SST), modeled salinity incorporating remote sensing data, reanalysis products, and in-situ data to study surface changes in previously difficult-to-access coastal Gulf of Alaska over the period 2003–2020. Despite river mouth SST warming from the beginning to the end of the study, data illustrate cooling of the Yukon from headwaters to the river mouth from 2011 to 2020. This result suggests a complex forcing in addition to warming, as well as the need for future examination with inverse models capable of assessing physical budgets for parameters like SST, river discharge, and atmospheric forcing. Here, open source data is combined with techniques such as eigenvalue analysis and a toy problem that uses machine-learning techniques to point to parameters related to SST change in the Yukon River mouth.The featured remote-sensing dataset in this study, the Group for High Resolution Sea Surface Temperature Microwave and Infrared (GHRSST-MWIR) has data from the MODIS sensor on the Aqua and Terra platforms [3] and also includes microwave-derived SSTs from the Advanced Microwave Scanning Radiometer. This dataset provides a unique look at nearly 20 years’ worth of SST data in an important NASA Climate Variability and Change focus area (CVC) [4; 5]. To begin to point to which parameters may contribute to change over the interannual SST variability in the Norton Sound, this remote sensing data is combined in a principal components analysis with other parameters of modeled salinity, reanalysis air temperature, water vapor, and precipitation from MERRA-2, and in-situ datasets of river discharge from the Yukon river headwaters (VonFinster dataset) and the Yukon river mouth at the Norton Sound (Arctic Great Rivers Observatory).
DOI: 10.48577/jpl.g2jkbv
title: DEVELOPMENT OF A STRATOSPHERIC BALLOON HYPERSPECTRAL MICROWAVE RADIOMETER FOR PLANETARY BOUNDARY LAYER OBSERVATION

description: We present the development of a hyperspectral microwave radiometer for high-altitude balloon deployment to better observe the Planetary Boundary Layer (PBL) with an unprecedented sensitivity. The new hyperspectral radiometer is based on the existing High-frequency Airborne Microwave and Millimeter-wave Radiometer (HAMMR) instrument. Our key innovation from existing microwave sounders is increasing the number of channels around the oxygen and water-vapor absorption lines with high-resolution spectral sampling, thereby reducing profile retrieval errors and providing wide-band coverage over the frequency range of 18-200 GHz. In this paper, we present the overall system design, including the Stratollite subsystem, the full optical subsystem, RF front-end, and a software defined back-end. We will also show preliminary outdoor radiometric test results using a complete 48-72 GHz radiometer system. The hyperspectral HAMMR-HD balloon experiment will acquire up to 30 days of high-resolution PBL data, over a variety of weather conditions, and over land and ocean.
DOI: 10.48577/jpl.9oblts
title: UNP and F Prime

description: No abstract available.
DOI: 10.48577/jpl.2pwzgj
title: Multidisciplinary Approach in the Quantum Age

description: No abstract available.
DOI: 10.48577/jpl.qpymgl
title: Passive Sounding Implementation Technology

description: No abstract available.
DOI: 10.48577/jpl.m413nv
title: Design of a Novel Eccentric Kinematic Hinge

description: No abstract available.
DOI: 10.48577/jpl.30mqzp
title: The ARIA-S1-GUNW: The ARIA Sentinel-1 Geocoded Unwrapped Phase Product for Open InSAR science and Disaster Response

description: No abstract available.
DOI: 10.48577/jpl.csiip9
title: Thermal Design of the High-Resolution Volatiles and Minerals Moon Mapper (HVM3) Instrument on the Lunar Trailblazer Mission (LTB)

description: The Lunar Trailblazer (LTB) Mission consists of a spacecraft that hosts two science instruments, the High-resolution Volatiles and Minerals Moon Mapper (HVM3) and the Lunar Thermal Mapper. Flight system delivery is scheduled for the Fall of 2022. The purpose of the mission is to understand the form, abundance and distribution of water on the Moon as well as the lunar water cycle. HVM3 is a pushbroom shortwave infrared (SWIR) Offner imaging spectrometer that is optimized for the detection of volatiles to map OH, bound H2O and water ice. It has a spatial resolution of 70 m/pixel over a 20 km swath width and a spectral resolution of 10 nm over a spectral range of 0.6 μm to 3.6 μm. The spacecraft will deploy from an ESPA Grande and enter a 100±30 km lunar polar orbit where it may operate over all beta angles. The HVM3 thermal control architecture consists of active and passive elements. It leverages the passive cryogenic cooler design developed for the Moon Minerology Mapper (M3) that underwent a similar orbit. The first stage of the passive cooler is used to reject the heat of a Lockheed Martin Micro1-2 cryocooler that is used to actively cool the focal plane array (FPA). The second stage of the passive cooler is used to passively cool the optics. An overview of the overall thermal control design approach is presented.
DOI: 10.48577/jpl.l5glzo
title: CASSINI RADAR RINGS OBSERVATIONS: CALIBRATION AND AMBIGUITY HANDLING

description: This paper describes a set of Cassini radar data collected on Saturn’s rings in the last year of operations when the space- craft was flown very close to the ring system. After describing the observing geometry, real aperture and range-compressed backscatter results are presented which reveal many of the in- teresting features of the ring system. The range-compressed backscatter has the potential for higher resolution results from these data, but first, the calibration has to account for the presence of range ambiguities. An algorithm for ambiguity removal based on solving a singular value decomposition is explored along with its inherent limitations.
DOI: 10.48577/jpl.8bgazs
title: High-Performance Embedded Space Computing System-on-Chip for space imaging spectrometer

description: No abstract available.
DOI: 10.48577/jpl.ocpbsn
title: Evolution of the Feed Assembly for INCUS from Preliminary Design to Flight Configuration

description: The INvestigation of Convective UpdraftS (INCUS) project is a new National Aeronautics and Space Administration (NASA) mission approved in 2022 that will observe and measure the movement of water droplets inside tropical storms from Low Earth Orbit (LEO). This data will be used to better understand the Convective Mass Flux (CMF) and improve weather models. The main instrument used for these measurements consists of a 1.6m diameter deployable mesh reflector antenna provided by Tendeg, a Ka-Band radar heritage of Raincube and a new feed assembly developed at Jet Propulsion Laboratory (JPL). The instrument will fly aboard a Blue Canyon Technology (BCT) commercial bus with Colorado State University leading the science team. This paper presents the evolution of the feed assembly from preliminary design to final flight configuration. Fabricated with a hybrid process, including additive manufacturing of a wax model and aluminum casting of the final assembly and waveguides all in one piece, the INCUS feed is a first under many points of view and it is paving the way for future flight projects to use this technology.
DOI: 10.48577/jpl.adbszs
title: Assessing the meteotsunami-atmosphere dynamic coupling using GNSS measurements

description: No abstract available.
DOI: 10.48577/jpl.ecoqsi
title: Overview of planetary missions from the Jet Propulsion laboratory

description: No abstract available.
DOI: 10.48577/jpl.q5swdi
title: Valid Flyby Parameters (VALPAR) Tool for Radar for Europa Assessment and Sounding: Ocean to Near-surface (REASON)

description: No abstract available.
DOI: 10.48577/jpl.u5mfpd
title: Timing and Range Ambiguity Analysis For Multistatic Radar

description: No abstract available.
DOI: 10.48577/jpl.xb5eja
title: Simulating Oscillator Phase Noise and Synchronization Effects on Multistatic Tomography

description: No abstract available.
DOI: 10.48577/jpl.wfkale
title: ASSESSMENT OF TERRAIN DEPENDENCE OF RADIOMETRIC TERRAIN CORRECTED C-BAND SENTINEL-1 SAR BACKSCATTER OVER DIFFERENT TARGET TYPES

description: No abstract available.
DOI: 10.48577/jpl.y6z4sx
title: Web-based 3D Visualization for Flight Mission Network Cybersecurity Analysis

description: No abstract available.
DOI: 10.48577/jpl.jeqrwr
title: IGARSS 2023: Application of Open-Source Digital Twins Framework for Wildland Fire and Air Quality

description: No abstract available.
DOI: 10.48577/jpl.sdux8q
title: (ExEP) Introductory Comments

description: No abstract available.
DOI: 10.48577/jpl.qhwsxl
title: Active Cryocooling Needs for NASA Space Instruments and Future Technology Development

description: No abstract available.
DOI: 10.48577/jpl.7emxbk
title: Introducing EXCALIBUR

description: No abstract available.
DOI: 10.48577/jpl.znpxvd
title: ANTHROPOGENIC AND NATURAL APPLICATIONS OF INSAR: FROM A REGIONAL TOWARDS A CONTINENTAL SCALE

description: No abstract available.
DOI: 10.48577/jpl.jio1bq
title: Photometric calibration in the ultraviolet of the Star-Planet Activity Research CubeSat (SPARCS)

description: The Start-Planet Activity Research CubeSat (SPARCS) is a NASA-funded mission led by Arizona State University, devoted to characterizing the UV emission of low-mass stars. During its one--year mission, SPARCS will observe close to 20 low-mass stars, with the goal of understanding their short and long-term UV variability. SPARCS is expected to be ready for launch in 2025. SPARCS’ payload is a 9-cm telescope paired with two delta-doped CCDs. The data calibration converts the raw instrument counts into an average flux for the two ultraviolet bands (153 - 171 nm, 258 - 308 nm). While the system is only weakly sensitive in the infrared, the target stars are very bright at long wavelengths. This requires careful correction for out-of-band emission. The system is being fully characterized on the ground to provide supporting data for the calibration. The calibration uses observations of very stable white dwarfs to achieve the 10% photometric accuracy requirement in both bands.
DOI: 10.48577/jpl.cv9uzt
title: Kinetic Inductance Detectors for the Terahertz Intensity Mapper

description: No abstract available.
DOI: 10.48577/jpl.rpu0jw
title: Attributing methane and CO2 plumes by emission sector with the EMIT and AVIRIS-3 imaging spectrometers

description: No abstract available.
DOI: 10.48577/jpl.4ra2qm
title: Surface Water Ocean Topography (SWOT) Workshop

description: No abstract available.
DOI: 10.48577/jpl.5ddofk
title: IGARSS 2023: BIG DATA SMART: FEDERATED EARTH SYSTEM DIGITAL TWINS

description: No abstract available.
DOI: 10.48577/jpl.g0aomv
title: EVE: Identification of Key Science Questions and Possible Implementation

description: No abstract available.
DOI: 10.48577/jpl.qzovnw
title: Validation and Application of Satellite Derived Sea Surface Salinity (SSS) and Sea Surface Temperature (SST) Gradients in Coastal Regions: Use of the Saildrone Uncrewed Vehicle

description: No abstract available.
DOI: 10.48577/jpl.w5kmg2
title: QUAKES-I AND SAR-FUSION AIRBORNE STEREOIMAGERS FOR OBSERVING LAND SURFACE PROCESSES

description: No abstract available.
DOI: 10.48577/jpl.wfljyw
title: Assessment of the Impact of Small-scale Ionospheric TEC Variations on INSAR

description: No abstract available.
DOI: 10.48577/jpl.kvkf7p
title: Spectral and Guiding Dynamics in GaN Photonic Crystal Scintillators: Optical Insights Across UV, X-ray, Alpha Radiation

description: No abstract available.
DOI: 10.48577/jpl.zgt6yn
title: Science benefits of GRACE-FO along-track data products

description: No abstract available.
DOI: 10.48577/jpl.tljygh
title: Detection of Artifacts Transients in Earth Science Observing Systems with Machine Learning Visualization

description: No abstract available.
DOI: 10.48577/jpl.vmdphe
title: ADVANCES IN IMAGING SPECTROMETER ATMOSPHERIC CORRECTION WITH THE OPEN-SOURCE ISOFIT CODEBASE

description: No abstract available.
DOI: 10.48577/jpl.phcvj8
title: ESTIMATING DUST ON SNOW - APPLICATION OF A COUPLED ATMOSPHERE-SURFACE MODEL TO SPACEBORNE EMIT IMAGING SPECTROMETER DATA

description: No abstract available.
DOI: 10.48577/jpl.sc46hb
title: Intelligent requirement-to-test-case traceability system via Natural Language Processing and Machine Learning Presentation Slides

description: No abstract available.
DOI: 10.48577/jpl.0yfciw
title: 2024-07-12 IGARSS Open-Source Framework for Earth System Digital Twins

description: No abstract available.
DOI: 10.48577/jpl.b8un68
title: Co-flier Concepts for NISAR and ROSE-L

description: No abstract available.
DOI: 10.48577/jpl.xcivvz
title: Linking Dark Matter to Visible Matter

description: No abstract available.
DOI: 10.48577/jpl.jzhdcw
title: THE OPERA RADIOMETRIC TERRAIN CORRECTED SAR BACKSCATTER FROM SENTINEL-1 (RTC-S1) PRODUCT

description: No abstract available.
DOI: 10.48577/jpl.2nf7u4
title: Monitoring forest biomass dynamics in the Laurentides reserve, Canada, using LiDAR data and Radar imagery

description: No abstract available.
DOI: 10.48577/jpl.cxmnsp
title: The Reality of Hardware Development Testing

description: No abstract available.
DOI: 10.15468/dl.epv3zp
title: Occurrence Download

description: A dataset listing the 10595 species recorded in GBIF matching the query:
{
 "and" : [
 {
 "or" : [
 "Geometry POLYGON((-73.82369 1.72374,-68.23717 1.72374,-68.23717 3.95602,-73.82369 3.95602,-73.82369 1.72374))",
 "Geometry POLYGON((-71.05784 7.47241,-71.05566 7.36125,-71.01424 7.33945,-70.96411 7.30893,-70.8682 7.32855,-70.80498 7.30893,-70.71779 7.29803,-70.67202 7.31765,-70.61534 7.32855,-70.53687 7.38522,-70.48674 7.48767,-70.48456 7.6577,-70.56521 7.62282,-70.63714 7.6032,-70.69164 7.61846,-70.75921 7.59012,-70.86166 7.56179,-70.97937 7.53345,-71.05784 7.47241))"
 ]
 },
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "OccurrenceStatus is Present",
 "TaxonKey is Tracheophyta"
 ]
}

 The dataset's 10595 records were derived from 125 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0023658-240626123714530/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.48577/jpl.slvq8v
title: Calibration of NISAR science algorithms and validation of NISAR science requirements

description: No abstract available.
DOI: 10.48577/jpl.vl4dfw
title: Selected Deployed JPL Autonomy Capabilities

description: No abstract available.
DOI: 10.48577/jpl.xs39h3
title: NISAR SWEEPSAR ECHO SIMULATION: SUMMARY AND RESULTS

description: No abstract available.
DOI: 10.48577/jpl.j6xeax
title: Lessons for the US Greenhouse Gas Center Summer School on Inverse Modeling of Greenhouse Gases (SSIM-GHG)

description: No abstract available.
DOI: 10.48577/jpl.znyejs
title: Experiments with Drones for DARTS

description: No abstract available.
DOI: 10.48577/jpl.g7imvk
title: Ocean Dynamics and Surface Exchange with the Atmosphere

description: No abstract available.
DOI: 10.48577/jpl.tmickt
title: The NASA-ISRO SAR Mission - L-Band SAR Digital Electronics Subsystem

description: No abstract available.
DOI: 10.48577/jpl.ksjpam
title: MODELING, ANALYSIS, AND DESIGN OF DYNAMIC COUPLINGS IN PLANETARY TETHERED AEROBOT SYSTEMS

description: No abstract available.
DOI: 10.48577/jpl.4temuh
title: Improving MISR AOD retrievals over land at medium to high aerosol loadings

description: No abstract available.
DOI: 10.48577/jpl.qbh96t
title: Systems Engineering Approach for the SPHEREx Telescope Mission

description: No abstract available.
DOI: 10.48577/jpl.pl3dsz
title: Observational Products for End-Users from Remote Sensing Analysis

description: No abstract available.
DOI: 10.48577/jpl.sbgl8d
title: NISAR L-Band Level-1 and Level-2 Data Processing Algorithms

description: No abstract available.
DOI: 10.48577/jpl.jqpa08
title: Cold Atom Lab: Five Years of Quantum Science on the International Space Station

description: No abstract available.
DOI: 10.34740/kaggle/dsv/8950187
title: ⏳ endoflife.date database (duckdb)
DOI: 10.48577/jpl.n05ga2
title: CHARACTERIZE ATMOSPHERIC STRUCTURE IN PLANETARY BOUNDARY LAYER (PBL) USING JOINT GNSS RADIO OCCULTATION (GNSS-RO) AND PASSIVE MICROWAVE RADIOMETER (MWR) RETRIEVAL

description: No abstract available.
DOI: 10.48577/jpl.ncqqhj
title: Network Based Detection of Travelling Ionospheric Disturbances from Hazards using GPS TEC

description: No abstract available.
DOI: 10.48577/jpl.lsia2w
title: Intrinsic Dimensionality and Spectral Diversity

description: No abstract available.
DOI: 10.48577/jpl.vo5j4x
title: Evaluating the Performance of SWE Retrieval Using Sentinel-1 Interferometric Data and QSI LIDAR data

description: No abstract available.
DOI: 10.15468/dl.x8vbgz
title: Occurrence Download

description: A dataset containing 22 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Country is Italy",
 "OccurrenceStatus is Present",
 "TaxonKey is Diversibipalium multilineatum (Makino & Shirasawa, 1983)"
 ]
}

 The dataset includes 22 records from 4 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0023660-240626123714530/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.48577/jpl.j4btdm
title: Ongoing Efforts in Radio Reflectometry With Rydberg Detectors

description: No abstract available.
DOI: 10.48577/jpl.lmq4yi
title: AVIRIS-3 Next-Generation Imaging Spectroscopy Calibration and First Results

description: No abstract available.
DOI: 10.48577/jpl.ckq3kb
title: Opportunities for coordination of Cal/Val, data fusion and data assimilation for international spaceborne SAR missions

description: No abstract available.
DOI: 10.48577/jpl.yslyid
title: The NASA-ISRO SAR Mission: Science Preparations for Operations and Early Results

description: No abstract available.
DOI: 10.48577/jpl.e3xsk9
title: Cloud Notification Mechanism (CNM)

description: No abstract available.
DOI: 10.48577/jpl.bopbtp
title: Workflows for NISAR data processing to address Solid Earth science, implemented on the On-Demand cloud system

description: No abstract available.
DOI: 10.48577/jpl.4g92u0
title: Enabling scalable, global open science with the Multi-mission Algorithm and Analysis Platform (MAAP)

description: No abstract available.
DOI: 10.48577/jpl.rrvqxg
title: Deep Space Network

description: No abstract available.
DOI: 10.48577/jpl.rlh8tj
title: Estimation of Total Surface and Subsurface Meltwater Amounts across Greenland Ice Sheet

description: No abstract available.
DOI: 10.48577/jpl.tn11jn
title: A new radio telescope to tackle the old mystery of the origins of the highest-energy cosmic rays in the Milky Way

description: No abstract available.
DOI: 10.48577/jpl.h8hxyh
title: Achieving Endurance Science with an Ultra-Compact Imaging Spectrometer: UCIS-Moon

description: No abstract available.
DOI: 10.48577/jpl.f1lfmi
title: Measuring Water Surface Elevation and Slope With Airborne Ka-Band InSAR: AirSWOT in the Delta-X Campaign

description: No abstract available.
DOI: 10.48577/jpl.xhxxic
title: DERIVING WATER CHANNEL MASKS AND OVERBANK FLOW IN COASTAL WETLANDS USING RAPID-REPEAT SAR

description: No abstract available.
DOI: 10.48577/jpl.vxz620
title: Planetary Cloud/Aerosol Research Facility (PCARF) Instrumentation

description: No abstract available.
DOI: 10.48577/jpl.aweh1m
title: OCO2/OCO3 Validation Campaign Report Railroad Valley, NV June 12-18, 2024

description: No abstract available.
DOI: 10.48577/jpl.7mbnyp
title: Near-Earth Object (NEO) Surveyor Update

description: No abstract available.
DOI: 10.48577/jpl.v0qhji
title: The California Ammonia Enhancement from Anthropogenic and Natural sources

description: No abstract available.
DOI: 10.48577/jpl.ll2t62
title: OVERCOMING LIMITATIONS OF GNSS-R SURFACTANT CHARACTERIZATION WITH POLARIMETRIC GNSS-R

description: No abstract available.
DOI: 10.48577/jpl.2wxfrd
title: Leveraging vegetation chlorophyll fluorescence for improved detection and attribution of global carbon-water cycle change

description: No abstract available.
DOI: 10.48577/jpl.zjjjp0
title: Astronomy on tap talks

description: No abstract available.
DOI: 10.48577/jpl.vnannb
title: OCEANOGRAPHIC RESULTS OF SWOT: OBSERVING SEA SURFACE HEIGHT AT THE SUBMESOSCALES

description: No abstract available.
DOI: 10.48577/jpl.abx1eq
title: Shallow Water Ice on Mars in the Northern Mid-to-High Latitudes Using Mars Reconnaissance Orbiter Mars Climate Sounder Temperature Observations

description: No abstract available.
DOI: 10.48577/jpl.ayfqqn
title: NISAR L-band Level-1 and Level-2 Science Data Products, Specifications, and Algorithms

description: No abstract available.
DOI: 10.48577/jpl.cmrerp
title: Thermal Control Design for Deep Space Optical Communication (DSOC) Docking Mechanism High-Output Paraffin Actuator

description: No abstract available.
DOI: 10.48577/jpl.jlytqt
title: A SURVEY OF ALGORITHMS FOR FUTURE THERMAL MISSIONS

description: No abstract available.
DOI: 10.48577/jpl.ew1y8b
title: Evaluating Satellite-based V11.1 OCO-2 XCO2 Measurements Against Ground-based TCCON and COCCON Measurements

description: No abstract available.
DOI: 10.48577/jpl.vnviwl
title: UAVSAR for NISAR Solid Earth Calibration and Validation

description: No abstract available.
DOI: 10.48577/jpl.sdptgr
title: Autonomy Assurance for Perception and Navigation

description: No abstract available.