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检索条件"任意字段=Conference on Enabling Sensor and Platform Technologies for Spaceborne Remote Sensing"

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Proceedings of SPIE - enabling sensor and platform technologies for spaceborne remote sensing

Proceedings of SPIE - Enabling Sensor and Platform Technolog...

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enabling sensor and platform technologies for spaceborne remote sensing

The proceedings contain 32 papers from the Proceedings of SPIE - enabling sensor and platform technologies for spaceborne remote sensing. The topics discussed include: future Earth observation program in JAXA;solid state data recorder for high-data-rate Earth observation sensors;design of the microsatellites used in the atmospheric neutral density experiments;precision attitude and position determination for the Advanced Land Observing Satellite (ALOS);UAV-based L-band SAR with precision flight path control;instrument concepts and technologies for future spaceborne atmospheric radars;fourier transform spectrometer for Greenhouse Gases Observing Satellite (GOSAT);and the far-infrared spectroscopy of the troposphere (FIRST) project.

关键词： Space research

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The challenge of active optical sensing from extreme orbits

The challenge of active optical sensing from extreme orbits

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conference on enabling sensor and platform technologies for spaceborne remote sensing

作者： Spiers, GD CALTECH Jet Prop Lab Pasadena CA 91109 USA

ISBN: (纸本)0819456209

A review of the history and current state of atmospheric sensing lidar from Earth orbit was conducted and it was found that space based earth remote sensing is still in its infancy with only one limited success extended duration autonomous mission to date. An analysis of the basic requirements for some candidate geo-stationary lidar concepts was completed and it was concluded that significant basic work is required in all areas of lidar development.

关键词： lidar laser radar laser remote sensing geo-stationary orbit

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Development of the WAMS-TIR instrument for SPF-II

Development of the WAMS-TIR instrument for SPF-II

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conference on enabling sensor and platform technologies for spaceborne remote sensing

作者： Okamura, Y Matsuyama, H Kasahara, M Yoshida, S Tange, Y JAXA EORC Chuo Ku Tokyo 1046023 Japan

ISBN: (纸本)0819456209

Wide-Angle Multi-band sensor - Thermal Infrared (WAMS-TIR), one of the three sensors aboard the station-keeping test airship (SPF-II) for the stratospheric platform project, is a thermal infrared multi-band radiometer designed to observe land surface temperature. WAMS-TIR consists of very wide field-of-view (over 100 deg) optics and an uncooled microbolometer array detector. It has band-pass filters mounted on a rotating wheel to select spectral bands in the range of 7 to 12 microns. A blackbody calibrator is also mounted on the same rotating wheel to calibrate sensor performance in the operation. Results of pre-flight performance tests suggest that WAMS-TIR has the predicted image quality and high radiometric performance. This paper describes the instrument design and the performance tests results of WAMS-TIR.

关键词： thermal infrared multi-band sensor wide field-of-view SPF

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Instrument concepts and technologies for future spaceborne atmospheric radars

Instrument concepts and technologies for future spaceborne a...

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conference on enabling sensor and platform technologies for spaceborne remote sensing

作者： Im, E Durden, SL CALTECH Jet Prop Lab Pasadena CA 91109 USA

ISBN: (纸本)0819456209

In conjunction with the implementation of spaceborne atmospheric radar flight missions, NASA is developing advanced instrument concepts and technologies for future spaceborne atmospheric radars, with the over-arching objectives of making such instruments more capable in supporting future science needs, and more cost effective. Two such examples are the Second-Generation Precipitation Radar (PR-2) and the Nexrad-In-Space (NIS). PR-2 is a 14/35-GHz dual-frequency rain radar with a deployable 5-meter, wide-swath scanned membrane antenna, a dual-polarized/dual-frequency receiver, and a real-time digital signal processor. It is intended for Low Earth Orbit (LEO) operations to provide greatly enhanced rainfall profile retrieval accuracy while using only a fraction of the mass of the current TRMM PR. NIS is designed to be a 35-GHz Geostationary Earth Orbiting (GEO) radar with the intent of providing hourly monitoring of the life cycle of hurricanes and tropical storms. It uses a 35-m, spherical, lightweight membrane antenna and Doppler processing to acquire 3-dimensional information on the intensity and vertical motion of hurricane rainfall. technologies for NIS are synergistic with those for PR-2. During the last two years, several of the technology items associated with these notional instruments have also been prototyped. This paper will give an overview of these instrument design concepts and their associated technologies.

关键词： TRMM GPM PR-2 NIS GEO LEO precipitation rainfall radar

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Payload accommodations on future environmental sensing spacecraft - Lessons learned from EOS and the future with NPOESS

Payload accommodations on future environmental sensing space...

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conference on enabling sensor and platform technologies for spaceborne remote sensing

作者： Andreoli, L Coyle, K Northrop Grumman Space Technol Redondo Beach CA USA

ISBN: (纸本)0819456209

The National Polar-orbiting Operational Environmental Satellite System (NPOESS) spacecraft design is based on the Northrop Grumman T430 that has legacy to the Earth Observing System (EOS) Aqua and Aura. The EOS conceived and was structured to achieve cost/schedule savings over multiple builds by adhering to rigorous requirements and minimizing changes to accommodate instruments. The larger sized NPOESS bus has been enhanced to support 14 or more sensors in common locations for the 3 NPOESS orbit planes. Spacecraft deck space and other spacecraft resources such as mass, power and data accommodation have been reserved for "Instruments of Opportunity" that may be selected and inserted into the baseline mission schedule at later dates. This poster will examine the EOS lessons learned from Aqua and Aura and report on the progress of the pre-planned product improvement (P3I) payload accommodations for NPOESS.

关键词： sensors Satellites Space operations Antennas Aerospace engineering Environmental sensing S band Planets sensor technology Standards development

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remote sensing of tropospheric chemistry using lidars from geostationary orbit

Remote sensing of tropospheric chemistry using lidars from g...

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conference on enabling sensor and platform technologies for spaceborne remote sensing

作者： Ismail, S Gervin, J Wood, HJ Peri, F NASA Langley Res Ctr Hampton VA 23665 USA

ISBN: (纸本)0819456209

Tropospheric chemistry is considered to be the next frontier of atmospheric chemistry, and understanding and predicting the global influence of natural and human-induced effects on tropospheric chemistry will be the next challenge for atmospheric research over the foreseeable future. A geostationary Earth orbit (GEO) vantage point provides an ideal location for measuring spatially and temporally resolved distributions of trace gas species. One powerful technique for making this measurement is LIght Detection And Ranging (lidar) using solid-state lasers. Presently, NASA has a notional plan for using lidars for tropospheric chemistry measurements, but from low Earth orbit (LEO). While permitting high spatially resolved measurements, LEO measurements, however, lack the temporal resolution required to monitor important atmospheric processes and transport. A GEO instrument will require a more energetic and efficient lidar system in order to permit accurate measurements. In this study, we investigated the capability of a lidar for tropospheric profiling of chemical species and we develop a roadmap for the requisite technologies.

关键词： DIAL lidar tropospheric chemistry atmospheric chemistry GEO

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Concepts and technologies for synthetic aperture radar from MEO and geosynchronous orbits

Concepts and technologies for synthetic aperture radar from ...

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conference on enabling sensor and platform technologies for spaceborne remote sensing

作者： Edelstein, W Madsen, S Moussessian, A Chen, C CALTECH Jet Prop Lab Pasadena CA 91109 USA

ISBN: (纸本)0819456209

The area accessible from a spaceborne imaging radar, e.g. a synthetic aperture radar (SAR), generally increases with the elevation of the satellite while the map coverage rate is a more complicated function of platform velocity and beam agility. The coverage of a low Earth orbit (LEO) satellite is basically given by the ground velocity times the relatively narrow swath width. The instantaneously accessible area will be limited to some hundreds of kilometers away from the sub-satellite point. In the other extreme, the sub-satellite point of a SAR in geosynchronous orbit will move relatively slowly, while the area which can be accessed at any given time is very large, reaching thousands of kilometers from the subsatellite point. To effectively use the accessibility provided by a high vantage point, very large antennas with electronically steered beams are required. Interestingly, medium Earth orbits (MEO) will enable powerful observational systems which provide large instantaneous reach and high mapping rates, while pushing technology less than alternative systems at higher altitudes. Using interferometric SAR techniques which can reveal centimeter-level (potentially sub-centimeter) surface displacements, frequent and targeted observations might be key to developing such elusive applications as earthquake forecasting. This paper discusses the basic characteristics of a SAR observational system as a function of the platform altitude and the technologies being developed to make such systems feasible.

关键词： SAR InSAR geosynchronous MEO SAR constellation

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Design of an advanced diode-pumped solid-state laser for high-altitude airborne operations

Design of an advanced diode-pumped solid-state laser for hig...

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conference on enabling sensor and platform technologies for spaceborne remote sensing

作者： Nieuwsma, DE Wang, JX Raytheon Space & Airborne Syst El Segundo CA 90245 USA

ISBN: (纸本)0819456209

As part of the Advanced Targeting FLIR (ATFLIR) program for the United States Navy, Raytheon has designed and developed a compact and rugged diode-pumped solid-state laser for high-altitude airborne targeting systems. This laser is based on the relatively mature Nd:YAG technology. In the laser pump head, 168 diode bars are stacked into 24 arrays, which, in turn, are packed around the laser rod to provide 4-sided optical pumping. These standard 20 degrees C operating temperature diode bars and the laser rod are conductively cooled to fins located in the air flow circulating in the pod housing. The laser operates with very low variation in output energy or beam divergence at laser pulse rates from 8 to 20 Hertz and ambient temperatures from -54 to +71 degrees C. The optical to optical efficiency of the pump head is better than 25%. Eye safe laser wavelengths are achieved thorough the use of an Optical Parametric Oscillator. This compact and rugged diode-pumped solid-state laser with proven performance and reliability on high altitude aircrafts can also be modified to serve as transmitters for a variety of airborne laser remote sensing applications. It also has the potential to serve as laser transmitters for spaceborne applications with some design changes and space qualifications.

关键词： solid-state laser Nd : YAG diode-pumped laser remote sensing LIDAR

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Technology challenges for earth observation from higher orbits

Technology challenges for earth observation from higher orbi...

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conference on enabling sensor and platform technologies for spaceborne remote sensing

作者： Cwik, T Boncyk, W Anderson, K Jet Prop Lab Pasadena CA 91109 USA

ISBN: (纸本)0819456209

Advances in Earth observing technologies are required to fulfill NASA's long-term vision for Earth system prediction in the years 2010 to 2020. The observing system during these years will include satellites in a variety of orbits including smaller, smarter ones in low Earth orbit, large aperture sensors in medium Earth orbit and geostationary orbit to provide enhanced temporal coverage and perhaps sentinel satellites at Lagrange points L1 and L2 to provide synoptic views of the entire globe. These higher vistas can meet pending science challenges in a variety of areas directly relevant to NASA's plans. They include, among others, meeting high temporal and spatial resolutions to observe rapidly evolving chemical events in the global atmosphere, meeting the requirements of increased spatial and temporal sensing of varying precipitation events over portions of the globe, and the increased temporal coverage necessary to see clear skies over coastal regions for coastal process monitoring. A set of technology tradeoffs and needs that meet the above science challenges can be identified. They include an increase in collecting aperture for passive measurements, increased transmitted power for active measurements, and improved on-board processing coupled with enhanced bandwidth communications as data collection increases. The technologies will involve differentiating filled versus sparse aperture collection systems, developing advanced scanning capabilities and large array detectors, as well as large structure pointing control and metrology. This talk will examine these issues for a range of NASA Earth science measurements.

关键词： Earth Science remote sensing instruments antennas optics detectors electronics higher orbits

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An integrated multiangle, multispectral, and polarimetric imaging concept for aerosol remote sensing from space

An integrated multiangle, multispectral, and polarimetric im...

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conference on enabling sensor and platform technologies for spaceborne remote sensing

作者： Diner, DJ Chipman, RA Beaudry, N Cairns, B Food, LD Macenka, SA Cunningham, TJ Seshadri, S Keller, C CALTECH Jet Prop Lab Pasadena CA 91109 USA

ISBN: (纸本)0819456209

Techniques for passive remote sensing of aerosol optical and microphysical properties from space include visible, near- and shortwave-infrared imaging (e.g., from MODIS), multiangle intensity imaging (e.g., ATSR-2, AATSR, MISR), near-ultraviolet mapping (e.g., TOMS/OMI), and polarimetry (e.g., POLDER, APS). Each of these methods has unique strengths. In this paper, we present a concept for integrating these approaches into a unified sensor. Design goals include spectral coverage from the near-UV to the shortwave infrared;intensity and polarimetric imaging simultaneously at multiple view angles;global coverage within a few days;kilometer to sub-kilometer spatial resolution;and measurement of the degree of linear polarization (DOLP) for a subset of the spectral complement with an uncertainty of 0.5% or less. This high polarimetric accuracy is the most challenging aspect of the design, and is specified in order to achieve climate-quality uncertainties in optical depth, refractive index, and other microphysical properties. Based upon MISR heritage, a pushbroom multi-camera architecture is envisioned, using separate line arrays to collect imagery within each camera in the different spectral bands and in different polarization orientations. For the polarimetric data, accurate cross-calibration of the individual line arrays is essential. An electro-optic polarization "scrambler", activated periodically during calibration sequences, is proposed as a means of providing this cross-calibration. The enabling component is a rapid retardance modulator. Candidate technologies include liquid crystals, rotating waveplates, and photoelastic modulators (PEMs). The PEM, which uses a piezoelectric transducer to induce rapid time-varying stress birefringence in a glass bar, appears to be the most suitable approach. An alternative measurement approach, also making use of a PEM. involves synchronous demodulation of the oscillating signal to reconstruct the polarization state. The latter me

关键词： aerosols remote sensing imaging polarization multiangle multispectral photoelastic modulator

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