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Guillaume W. Bres edited this page May 18, 2024 · 3 revisions

SP3: Precise Orbital Products

The toolbox allows the user to load SP3 precision products into the context.

When doing so:

  • the provided context becomes PPP compliant in terms of orbital attitudes
  • new orbital visualizations become available
  • new time domain visualizations become available
  • the Radio/SP3 residual analysis becomes available

Orbits visualization

Orbit visualization is requested with --orbits if Graphical Mode is first enabled with -g.

If SP3 files were loaded, their orbital content is projected.
If both NAV and SP3 files are loaded, both their orbital content are projected and you can graphically compare both. The orbital residual operation becomes available, it will project the residues between the SV state broadcasted over radio and the post processed SP3

Example:

./target/release/rinex-cli \
   -f test_resources/NAV/V3/ESBC00DNK_R_20201770000_01D_MN.rnx.gz \
   -f test_resources/SP3/GRG0MGXFIN_20201770000_01D_15M_ORB.SP3.gz \
   -P GPS \
   -g --orbits --orbit-residual

Time domain visualization

SP3 are not prefered in terms of temporal data (see PPP paragraph), but they may contain such information. If that is the case, the --clk visualization is enhanced and will project the clock states described in this file. A new SP3/Radio temporal residual analysis becomes available and is also generated.

Example: compare time domain information contained in the SP3 file to the broadcast radio, similarly to previous example:

./target/release/rinex-cli \
   -f test_resources/NAV/V3/ESBC00DNK_R_20201770000_01D_MN.rnx.gz \
   -f test_resources/SP3/GRG0MGXFIN_20201770000_01D_15M_ORB.SP3.gz \
   -P GPS \
   -g --clk --clk-residual

SP3 for PPP

⚠️ SP3 is not a valid source of Clock Data for ultimate PPP solutions.

SP3 provides the precise orbital information required for PPP.
We highly recommend attaching an SP3 to any NAV RINEX you provide.

This toolbox is smart enough to operate without Clock RINEX and use Clock information that might be present in SP3 files. This provides a somewhat optimal surveying scenario, which will always be less ideal than providing actual Clock RINEX.

Pay attention to the Geoid in which the SP3 coordinates are referenced to. We currently only support WGS84 and the geoid will vary a lot from one agency to another.

What's next

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