Pub Date : 2006-10-02DOI: 10.2514/6.iac-06-d3.1.05
R. McNutt
ll solar system objects are, in principle, targets for human in situ exploration. ARGOSY (ARchitecture for Going to the Outer solar SYstem) addresses anew the problem of human exploration to the outer planets. The ARGOSY architecture approach is scalable in size and power so that increasingly distant destinations—the systems of Jupiter, Saturn, Uranus, and Neptune—can be reached with the same crew size and time requirements. To enable such missions, achievable technologies with appropriate margins must be used to construct a viable technical approach at the systems level. ARGOSY thus takes the step past Mars in addressing the most difficult part of the Vision for Space Exploration: To extend human presence across the solar system.
{"title":"ARGOSY: ARchitecture for Going to the Outer solar SYstem","authors":"R. McNutt","doi":"10.2514/6.iac-06-d3.1.05","DOIUrl":"https://doi.org/10.2514/6.iac-06-d3.1.05","url":null,"abstract":"ll solar system objects are, in principle, targets for human in situ exploration. ARGOSY (ARchitecture for Going to the Outer solar SYstem) addresses anew the problem of human exploration to the outer planets. The ARGOSY architecture approach is scalable in size and power so that increasingly distant destinations—the systems of Jupiter, Saturn, Uranus, and Neptune—can be reached with the same crew size and time requirements. To enable such missions, achievable technologies with appropriate margins must be used to construct a viable technical approach at the systems level. ARGOSY thus takes the step past Mars in addressing the most difficult part of the Vision for Space Exploration: To extend human presence across the solar system.","PeriodicalId":14788,"journal":{"name":"Johns Hopkins Apl Technical Digest","volume":"27 1","pages":"261-273"},"PeriodicalIF":0.2,"publicationDate":"2006-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69064012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract : My long-term goal is to continue to test and refine a similarity-based method for the extraction of marine atmospheric boundary layer (MABL) fluxes from synthetic aperture radar (SAR) wind imagery of the sea surface. Thus far, I have implemented this method on seventeen SAR wind images from off the east coast of the United States using bulk-derived statistics from coincident buoy data as ground truth. Agreement is encouraging. The rate of acquisition of SAR wind imagery available to me has increased. Imagery is available over the Gulf of Alaska as well as off the east coast of the United States, in conjunction with the National Oceanic and Atmospheric Administration (NOAA)-sponsored Storm Watch / Alaska SAR Demonstration (http://fermi.jhuapl.edu/sar/stormwatch/index.html). Therefore, the potential for robust testing of the method will continue. Questions I wish to address include the influence of the surface wave state, the synoptic and mesoscale meteorological environment, pixel size, and the averaging window size of the SAR wind imagery on the performance of the method.
{"title":"Testing the diagnosis of marine atmospheric boundary-layer structure from synthetic aperture radar","authors":"T. Sikora, D. Thompson, J. Bleidorn","doi":"10.21236/ada630865","DOIUrl":"https://doi.org/10.21236/ada630865","url":null,"abstract":"Abstract : My long-term goal is to continue to test and refine a similarity-based method for the extraction of marine atmospheric boundary layer (MABL) fluxes from synthetic aperture radar (SAR) wind imagery of the sea surface. Thus far, I have implemented this method on seventeen SAR wind images from off the east coast of the United States using bulk-derived statistics from coincident buoy data as ground truth. Agreement is encouraging. The rate of acquisition of SAR wind imagery available to me has increased. Imagery is available over the Gulf of Alaska as well as off the east coast of the United States, in conjunction with the National Oceanic and Atmospheric Administration (NOAA)-sponsored Storm Watch / Alaska SAR Demonstration (http://fermi.jhuapl.edu/sar/stormwatch/index.html). Therefore, the potential for robust testing of the method will continue. Questions I wish to address include the influence of the surface wave state, the synoptic and mesoscale meteorological environment, pixel size, and the averaging window size of the SAR wind imagery on the performance of the method.","PeriodicalId":14788,"journal":{"name":"Johns Hopkins Apl Technical Digest","volume":"7 1","pages":"94-99"},"PeriodicalIF":0.2,"publicationDate":"2000-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67989374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
P. Vachon, P. Adlakha, H. Edel, M. Henschel, B. Ramsay, D. Flett, M. Rey, G. Staples, Sylvia J. Thomas
ith Radarsat-1 presently in operation and Radarsat-2 approved, Canada is starting to develop synthetic aperture radar (SAR) applications that require imagery on an operational schedule. Sea ice surveillance is now a proven near–real-time application, and new marine and coastal roles for SAR imagery are emerging. Although some image quality and calibration issues remain to be addressed, ship detection and coastal wind field retrieval are now in demonstration phases, with significant participation from the Canadian private sector. (Keywords: Ice, Ocean, SAR, Ship, Wind.)
{"title":"Canadian Progress Toward Marine and Coastal Applications of Synthetic Aperture Radar","authors":"P. Vachon, P. Adlakha, H. Edel, M. Henschel, B. Ramsay, D. Flett, M. Rey, G. Staples, Sylvia J. Thomas","doi":"10.4095/219553","DOIUrl":"https://doi.org/10.4095/219553","url":null,"abstract":"ith Radarsat-1 presently in operation and Radarsat-2 approved, Canada is starting to develop synthetic aperture radar (SAR) applications that require imagery on an operational schedule. Sea ice surveillance is now a proven near–real-time application, and new marine and coastal roles for SAR imagery are emerging. Although some image quality and calibration issues remain to be addressed, ship detection and coastal wind field retrieval are now in demonstration phases, with significant participation from the Canadian private sector. (Keywords: Ice, Ocean, SAR, Ship, Wind.)","PeriodicalId":14788,"journal":{"name":"Johns Hopkins Apl Technical Digest","volume":"21 1","pages":"33-40"},"PeriodicalIF":0.2,"publicationDate":"2000-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70351968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Katsaros, P. Vachon, P. Black, P. Dodge, E. Uhlhorn
our hurricane images obtained by Radarsat were examined. Strong variations in backscatter from the surface in and around convective cells associated with rain cells and rain bands were observed, coupled with increased backscatter in regions of high wind outflow. Long linear features of 3 to 6 km were also noted in three of the four hurricanes, probably due to secondary circulations in the atmospheric boundary layer (roll vortices). They occurred between convective rain bands, where the descending motion could produce a well-defined boundary layer. Although the origins and mechanisms producing the features are still not clear, the high-resolution wide swath coverage modes of synthetic aperture radar provide new insights and present important questions for further research. (Keywords: Hurricanes, Roll vortices, SAR winds, Surface features.)
{"title":"Wind Fields from SAR: Could They Improve Our Understanding of Storm Dynamics?","authors":"K. Katsaros, P. Vachon, P. Black, P. Dodge, E. Uhlhorn","doi":"10.4095/219617","DOIUrl":"https://doi.org/10.4095/219617","url":null,"abstract":"our hurricane images obtained by Radarsat were examined. Strong variations in backscatter from the surface in and around convective cells associated with rain cells and rain bands were observed, coupled with increased backscatter in regions of high wind outflow. Long linear features of 3 to 6 km were also noted in three of the four hurricanes, probably due to secondary circulations in the atmospheric boundary layer (roll vortices). They occurred between convective rain bands, where the descending motion could produce a well-defined boundary layer. Although the origins and mechanisms producing the features are still not clear, the high-resolution wide swath coverage modes of synthetic aperture radar provide new insights and present important questions for further research. (Keywords: Hurricanes, Roll vortices, SAR winds, Surface features.)","PeriodicalId":14788,"journal":{"name":"Johns Hopkins Apl Technical Digest","volume":"57 1","pages":"86-93"},"PeriodicalIF":0.2,"publicationDate":"2000-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70351592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1989-01-01DOI: 10.1016/s0198-0254(06)80519-4
J. MacArthur, C. Kilgus, Charles A. Twigg, P. Brown
{"title":"Evolution of the satellite radar altimeter","authors":"J. MacArthur, C. Kilgus, Charles A. Twigg, P. Brown","doi":"10.1016/s0198-0254(06)80519-4","DOIUrl":"https://doi.org/10.1016/s0198-0254(06)80519-4","url":null,"abstract":"","PeriodicalId":14788,"journal":{"name":"Johns Hopkins Apl Technical Digest","volume":"1 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"1989-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/s0198-0254(06)80519-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"56426731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The results of analyses of the data gathered by Magsat on the geomagnetic field, crustal magnetic anomalies, fields arising from external current systems, and in investigations of the earth's core, mantle, and core-mantle boundary are presented. A least squares potential function showed that the geomagnetic field was 30,000-50,000 nanoteslas at the Magsat altitude, while fields from external sources were 0-1000 nanoteslas and those from crustal sources 0-50 nanoteslas. Long-wavelength magnetic anomalies were correlated with tectonic features, sometimes reflecting undulations in the Curie isotherm at other times changes in the structure of the lower crust. Detailed anomaly maps from regional data analyses are provided, and possible future spacecraft missions for improving the resolution of contours and strengths of the anomalies are described.
{"title":"Results from the Magsat mission","authors":"R. Langel","doi":"10.1190/1.1827060","DOIUrl":"https://doi.org/10.1190/1.1827060","url":null,"abstract":"The results of analyses of the data gathered by Magsat on the geomagnetic field, crustal magnetic anomalies, fields arising from external current systems, and in investigations of the earth's core, mantle, and core-mantle boundary are presented. A least squares potential function showed that the geomagnetic field was 30,000-50,000 nanoteslas at the Magsat altitude, while fields from external sources were 0-1000 nanoteslas and those from crustal sources 0-50 nanoteslas. Long-wavelength magnetic anomalies were correlated with tectonic features, sometimes reflecting undulations in the Curie isotherm at other times changes in the structure of the lower crust. Detailed anomaly maps from regional data analyses are provided, and possible future spacecraft missions for improving the resolution of contours and strengths of the anomalies are described.","PeriodicalId":14788,"journal":{"name":"Johns Hopkins Apl Technical Digest","volume":"1 1","pages":""},"PeriodicalIF":0.2,"publicationDate":"1982-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"65856349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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