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Issues Associated with Use of the L2C Signal for Aviation

Issues Associated with Use of the L2C Signal for Aviation. Daniel O’Laughlin 10 March 2004. Potential Aviation Benefits of L2C. In 2003, MITRE assessed L2C benefits to both the WAAS ground system and airborne user Study found that there were potentially significant benefits to both Ground

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Issues Associated with Use of the L2C Signal for Aviation

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  1. Issues Associated with Use of the L2C Signal for Aviation Daniel O’Laughlin 10 March 2004

  2. Potential Aviation Benefits of L2C • In 2003, MITRE assessed L2C benefits to both the WAAS ground system and airborne user • Study found that there were potentially significant benefits to both • Ground • More robust carrier and code tracking than current L2 semi-codeless receivers (especially in scintillation) • Airborne • More robust carrier and code tracking • Permits direct ionospheric delay estimates • High availability of LPV service (availability of GLS service is also improved) • Backup in the case of interference on L1 or L5

  3. Carrier Tracking Error for the L2C and L2SC Ground Receiver at Different Amplitude and Phase Scintillation Levels L2SC L2C

  4. Availability of Dual Frequency (L1/L2C) LPV Vertically Guided Approach Service

  5. Spectrum Issues • International Telecommunications Union (ITU) allocations for 1215 – 1240 MHz are (all Primary): • Earth Exploration Satellite (active) • Radiolocation • Radionavigation Satellite (s > E) • Space Research (active) • Footnotes add Fixed/Mobile and Radionavigation as Primary allocations in 34 and 73 countries, respectively • Mobile allocations in India and Japan can be expected to migrate to most of the Asia-Pacific region in the next few years • Due to spectrum issues, the International Civil Aviation Organization (ICAO) decided in April 2002 not to develop international aviation standards for L2C

  6. Summary and Recommendations • L2C could provide important benefits to both the WAAS ground system and the aviation user • Most of these benefits will be provided by L5, but later • Due to spectrum issues, safety-of-life aviation uses of L2C are not recommended • L2C may have a limited role as a supplemental navigation signal (to L1 and L5)

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