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<p>In addition to providing accurate local location fixes, SparkFun RTK devices can also serve as a correction source, also called a <em>Base</em>. The Base doesn't move and 'knows' where it is so it can calculate the discrepancies between the signals it is receiving and what it should be receiving. Said differently, the 'Base' is told where it is, and that it's not moving. If the GPS signals say otherwise, the Base knows there was a disturbance in the <del>Force</del> ionosphere. These differences are the correction values passed to the Rover so that the Rover can have millimeter-level accuracy.</p>
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<p>There are two types of bases: <em>Surveyed</em> and <em>Fixed</em>. A surveyed base is often a temporary base set up in the field. Called a 'Survey-In', this is less accurate but requires only 60 seconds to complete. The 'Fixed' base is much more accurate but the precise location at which the antenna is located must be known. A fixed base is often a structure with an antenna bolted to the side. Raw satellite signals are gathered for a few hours and then processed using Precision Point Position. We have a variety of tutorials that go into depth on these subjects but all you need to know is that the RTK Facet supports both Survey-In and Fixed Base techniques.</p>
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<p>In addition to providing accurate local location fixes, SparkFun RTK devices can also serve as a correction source, also called a <em>Base</em>. The Base doesn't move and 'knows' where it is so it can calculate the discrepancies between the signals it is receiving and what it should be receiving. Said differently, the Base is told where it is, and that it's not moving. If the GPS signals say otherwise, the Base knows there was a disturbance in the <del>Force</del> ionosphere. These differences are the correction values passed to the Rover so that the Rover can have millimeter-level accuracy.</p>
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<p>There are two types of bases: <em>Surveyed</em> and <em>Fixed</em>. A Surveyed Base is often a temporary base set up in the field. Called a <strong>Survey-In</strong>, this is less accurate but requires only 60 seconds to complete. A Fixed Base is much more accurate but the precise location at which the antenna is located must be known. A Fixed Base is often a structure with an antenna bolted to the side. Raw satellite signals are gathered for a few hours and then processed using Precision Point Position. We have a variety of tutorials that go into depth on these subjects but all you need to know is that all our RTK devices support both Survey-In and Fixed Base techniques.</p>
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<p>Please see the following tutorials for more information:</p>
<p>To achieve an RTK Fix, SparkFun RTK products must be provided with a correction source. An RTK device can obtain corrections from a variety of sources. Below is the list of possible sources (not all platforms support all sources) and their default priorities. These defaults generally follow the rule that a shorter baseline between Rover and Base leads to more accurate, and therefore more valuable, correction data:</p>
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<ul>
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<li>External Radio (100m <ahref="https://docs.sparkfun.com/SparkFun_RTK_Everywhere_Firmware/correction_sources/#osr-vs-ssr" target="_blank" rel="noopener">OSR</a> Baseline)</li>
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<li>ESP-Now (100m OSR Baseline)</li>
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<li>LoRa Radio (1km OSR Baseline)</li>
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<li>Bluetooth (10+km OSR/SSR Baseline)</li>
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<li>USB (10+km OSR/SSR Baseline)</li>
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<li>TCP (NTRIP) (10+km OSR/SSR Baseline)</li>
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<li>L-Band (100km SSR Baseline)</li>
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<li>IP (PointPerfect/MQTT) (100+km SSR Baseline)</li>
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<li>External Radio (100m <ahref="https://docs.sparkfun.com/SparkFun_RTK_Everywhere_Firmware/correction_sources/#osr-vs-ssr" target="_blank" rel="noopener">OSR</a> Baseline) - Two packet radios communicating directly between a Rover and Base</li>
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<li>ESP-Now (100m OSR Baseline) - Two RTK devices communicating directly between a Rover and Base over the built-in 2.4GHz radios</li>
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<li>LoRa Radio (1km OSR Baseline) - Two RTK devices communicating directly between a Rover and Base over the built-in LoRa radios (RTK Torch only)</li>
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<li>Bluetooth (10+km OSR/SSR Baseline) - A Rover obtaining corrections over Bluetooth to a phone/tablet that has an NTRIP Client</li>
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<li>USB (10+km OSR/SSR Baseline) - A Rover obtaining corrections over USB to a phone/tablet that has an NTRIP Client</li>
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<li>TCP (NTRIP) (10+km OSR/SSR Baseline) - A Rover obtaining corrections over WiFi to a NTRIP Caster</li>
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<li>L-Band (100km SSR Baseline) - A Rover obtaining corrections from a geosynchronous satellite</li>
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<li>IP (PointPerfect/MQTT) (100+km SSR Baseline) - A Rover obtaining corrections from an SSR type correction service over WiFi or cellular</li>
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</ul>
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<p>The <em>Corrections Priorities</em> menu allows a user to specify which correction source should be given priority. For example, if corrections are provided through ESP-NOW and IP PointPerfect simultaneously, the corrections from IP PointPerfect will be discarded because the ESP-NOW source has a higher priority. This prevents the RTK engine from receiving potentially mixed correction signals.</p>
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