AN APPLICATION OF THE GLOBAL POSITIONING SYSTEM TO SEARCH AND RESCUE AND REMOTE TRACKING

Retransmission of radionavigation signals enables the location of remote objects in such applications as remote tracking and search and rescue. Previous retransmission systems have used low- and very-low-frequency navaids, all of which have some limitations in coverage, accuracy or ambiguities. The NAVSTAR Global Positioning System, currently under development, will provide highly accurate and unambiguous positioning which will be available continuously anywhere in the world, thereby overcoming the limitations of the low-frequency navaids. The GPS will use L-band carriers which are modulated by pseudorandom noise ranging signals, thereby providing immunity to jamming and multipath interference. These signals are produced by linear feedback shift register generators and are detected by correlation with locally generated codes. Retransmission can be accomplished by translation, remodulation, spread spectrum multiplexing, bandwidth reduction, or preprocessing. The use of prepocessing requires an algorithm for rapid acquisition of the spread spectrum signals; this is accomplished by searching first for setting satellites.

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    Institute of Navigation

    815 14th Street, NW
    Washington, DC  USA  20005
  • Authors:
    • Raab, F H
    • Board, G W
    • Arling, S D
    • Dobbs, J D
    • Smrdel, S C
    • Waechter, J R
  • Publication Date: 1977

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Filing Info

  • Accession Number: 00170525
  • Record Type: Publication
  • Source Agency: Navigation
  • Files: TRIS
  • Created Date: Mar 7 1978 12:00AM