GLOBAL POSITIONING SYSTEM, REQUEST FOR INFORMATION ON A NEW GPS SIGNAL IN SPACE The Global Positioning System (GPS) Joint Program Office is interested in industry comments on the concept of a new, unique and exclusive military GPS signal-in-space (SIS) designated as Link-Military (or Lm). The purpose of this concept is to ensure civil GPS service is uninterrupted in areas of the world adjacent to any military theater of operations in wartime, while providing full military advantage under conditions of electronic combat and information warfare. In conjunction with the military signal, the GPS JPO is interested in ideas for a second civil frequency. The GPS JPO envisions the future GPS signal architecture to be backward compatible with the current structure of C/A and Y-Code on L1, Y-Code on L2, and provide the civil user with a frequency for ionospheric corrections and code for robustness in civil navigation. The Lm structure may include frequency bands other than the current L-band, with modulation, coding and navigation data structures different from those currently employed in the present GPS signal design. The GPS JPO envisions this new signal structure to be tested and implemented on a future GPS satellite. The purpose of this Request for Information (RFI) is to help the GPS JPO define the future architecture of the GPS, including consideration for civil (government and commercial) GPS augmentations and other Global Navigation Satellite Systems (GNSS) that will complement the GPS. The future GPS signal design (including Lm) will drive the definition of this system architecture. The GPS JPO is actively seeking industry involvement in the future design of the GPS to ensure program decisions do not conflict with commercial receiver design directions. For example, one Lm concept could affect current Y-code signal structure and restrain civil signal bandwidth currently available on L1. Your innovative thoughts are welcome on this subject. Your inputs may be used to define the eventual Lm, as well as influence the future GPS architecture. In order to get the maximum benefit from industry's creativity, any information considered proprietary will be protected by the Government as such. All replies should be less than 10 pages and submitted no later than 15 April to SMC/CZE, Attn: J.B. Borris, 2435 Vela Way, Suite 1613, El Segundo, CA 90245-4569. Additional information is available on the Lm web page at http://www.laafb.af.mil/SMC/CZ/homepage/lm/ or call Mr. J.B. Borris at (310) 363-0987. This request for information is not intended to award a contract on the basis of information submitted nor otherwise pay for information solicited.

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