NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Method of locating persons in distressA method for locating any person in distress in a selected area on the surface of the earth who has deployed passive radio frequency (RF) reflectors in a predetermined arrangement is analyzed. A first transparency is made in the spatial frequency domain of an image of said predetermined arrangement of said RF reflectors. The said selected area of the surface of the earth is scanned by means of a side-looking radar, on board a satellite or aircraft, to produce radar images. Second transparencies in the conventional image domain are produced from the radar images. It is then determined from the first and second transparencies, by means of complex spatial filtering.
Document ID
19770014323
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Sivertson, W. E., Jr. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 8, 2013
Publication Date
April 19, 1977
Subject Category
Communications And Radar
Report/Patent Number
Patent Number: US-PATENT-4,019,179
Patent Number: NASA-CASE-LAR-11390-1
Patent Application Number: US-PATENT-APPL-SN-662176
Accession Number
77N21267
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-4,019,179|NASA-CASE-LAR-11390-1
Patent Application
US-PATENT-APPL-SN-662176

Related Records

IDRelationTitleN76-18315Superseded By
No Preview Available