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Signal Deformation Proposal

Signal Deformation Proposal. R. Eric Phelts , Gabriel Wong, Todd Walter, Per Enge Stanford University IWG 26 February 5-7, 2014. Potential L1/L5 Tracking Constraints. Current constraints allow early minus late (E-L) and double delta (DD) receivers

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Signal Deformation Proposal

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  1. Signal Deformation Proposal R. Eric Phelts, Gabriel Wong, Todd Walter, Per EngeStanford University IWG 26 February 5-7, 2014

  2. Potential L1/L5 Tracking Constraints • Current constraints allow early minus late (E-L) and double delta (DD) receivers • each have three regions describing receiver filter bandwidth, group-delay variation across the passband,and correlator spacing • SBAS GEOs have two regions • Propose removing double delta altogether and shrinking allowed region • Also align SBAS & GPS tracking regions • BOC regions still being investigated

  3. Nominal SD Range Error Contours for WAAS Users User Receiver Bandwidth (MHz) User Receiver Correlator Spacing (chips) Current Allowed L1 Receiver Constraints New Reference New Reference Current Reference Current Reference User Receiver Bandwidth (MHz) User Receiver Correlator Spacing (chips)

  4. Nominal Signal Deformations on L1 and L5 Different code modulations have similar structures at chip transitions. Slide Courtesy: Gabriel Wong

  5. Nominal SD Range Error Contours for WAAS Users New Proposed Allowed DF Receiver Constraints (L1, L5) L5 L1 User Receiver Bandwidth (MHz) User Receiver Bandwidth (MHz) User Receiver Correlator Spacing (chips) User Receiver Correlator Spacing (chips)

  6. Proposal for BPSK Signals • Only allow early minus late • L1 C/A • Bandwidth between 12 and 24 MHz • Correlator spacing between 0.08 and 0.12 • Group delay < 150 nsec (including antenna) • L5/E5A • Bandwidth = tight region around 24 MHz • Correlator spacing = tight region around 1 chip • Exact region TBD • Group delay < 150 nsec (including antenna)

  7. Proposal for SBAS Satellites • Wide bandwidth SBAS satellites shall be treated identically to the BPSK requirements for GPS • Narrow bandwidth SBAS satellites require one of the following actions: • Narrow bandwidth SBAS satellites not allowed • Bandwidth is indicated in message • Tracked differently, may not be used for vertical • Still tracked with narrow correlator, but UDRE indicates it cannot be used for vertical

  8. Code Offset (chips) Example: Digital Signal Deformation Fault on CBOC(1,1) or TMBOC(1,1) Some modernized code correlation peaks are relatively complex

  9. Proposal for BOC Signals • EUROCAE WG-62 proposed not using BOC(6,1) component • Agree to only track BOC(1,1) • Same filter region as for L1 BPSK • Bandwidth between 16 and 24 MHz • Group delay < 150 nsec (including antenna) • Correlator spacing still under evaluation • Early minus late only

  10. Backup Slides

  11. NominalL1 SD Range Errors for Allowed User Receiver Configurations User Receiver Bandwidth (MHz) Propose removal User Receiver Correlator Spacing (chips)

  12. Bandwidth (MHz) Correlator Spacing (chips) L5 Nominal Deformation Errors (Updated)

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