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gnss-sdr/docs/xml-schemas/README.md

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Add XML Schemas for Assisted GNSS
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# XML Schemas for Assisted GNSS-SDR
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[comment]: # (
SPDX-License-Identifier: GPL-3.0-or-later
)
[comment]: # (
SPDX-FileCopyrightText: 2011-2020 Carles Fernandez-Prades <carles.fernandez@cttc.es>
)
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GNSS-SDR can read assistance data from
[Extensible Markup Language (XML)](https://www.w3.org/XML/) files for faster
[Time-To-First-Fix](https://gnss-sdr.org/design-forces/availability/#time-to-first-fix-ttff),
and can store navigation data decoded from GNSS signals in the same format. This
folder provides XML Schemas which describe those XML files structure.
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[XSD (XML Schema Definition)](https://www.w3.org/XML/Schema) is a World Wide Web
Consortium (W3C) recommendation that specifies how to formally describe the
elements in an XML document.
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## GPS L1 C/A
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- [ephemeris_map.xsd](./ephemeris_map.xsd) - GPS NAV message ephemeris
parameters.
- [iono_model.xsd](./iono_model.xsd) - GPS NAV message ionospheric model
parameters.
- [utc_model.xsd](./utc_model.xsd) - GPS NAV message UTC model parameters.
- [gps_almanac_map.xsd](./gps_almanac_map.xsd) - GPS NAV message almanac.
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## GPS L2C and L5
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- [cnav_ephemeris_map.xsd](./cnav_ephemeris_map.xsd) - GPS CNAV message
ephemeris parameters.
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## Galileo
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- [gal_ephemeris_map.xsd](./gal_ephemeris_map.xsd) - Galileo ephemeris
parameters.
- [gal_iono_model.xsd](./gal_iono_model.xsd) - Galileo ionospheric model
parameters.
- [gal_utc_model.xsd](./gal_utc_model.xsd) - Galileo UTC model parameters.
- [gal_almanac_map.xsd](./gal_almanac_map.xsd) - Galileo almanac.
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---
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Please check https://gnss-sdr.org/docs/sp-blocks/global-parameters/ for more
information about the usage of XML files in GNSS-SDR.
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You could find useful the utility program
[rinex2assist](https://github.com/gnss-sdr/gnss-sdr/tree/next/src/utils/rinex2assist)
for the generation of compatible XML files from recent, publicly available RINEX
navigation data files.