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<p>Feel free to look at and make a copy of the <ahref="https://docs.google.com/spreadsheets/d/1uEGnceLoAVwG3xnyWp8XTN8BBa__z4pg0l7IQRBcj8c/edit?usp=sharing" target="_blank" rel="noopener">SparkFun example</a> spreadsheet. ECEF is a wonderfully simplistic frame of reference; the comparison between two points is simply X/Y/Z in meters. We can use the Pythagorean theorem to calculate the 3D variance. In our example, it is 52mm using corrections from a fixed base, and 189mm for an L-Band corrected base.</p>
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<p>52mm off a professional mark is a clear indicator we are <em>very close</em> to the limit of our equipment. The sheer amount of geoscience, coordinate math, and relativistic physics that very smart people have contributed to enable any part of this experiment is awe-inspiring. It gave me great satisfaction and reassurance that our base at SparkFun HQ is set up well, and that, in the hands of a professional, the RTK product line is quite capable of providing <em>very</em> accurate readings.</p>
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<h2id="how-do-i-get-14mm">How do I get 14mm?!<aclass="headerlink" href="#how-do-i-get-14mm" title="Permanent link"></a></h2>
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<h2id="how-do-i-get-10mm">How do I get 10mm?!<aclass="headerlink" href="#how-do-i-get-10mm" title="Permanent link"></a></h2>
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<ul>
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<li>Use the best equipment. Our mechanical setup was rickety and cheap. Use a surveyor’s bipod setup, with a bubble level, and a prism pole to accurately level the RTK receiver and measure the distance to the monument.</li>
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<li>Use an antenna that is NGS calibrated to obtain accurate ARPs. The <ahref="https://www.sparkfun.com/products/17751" target="_blank" rel="noopener">SparkFun TOP106 antenna</a> has been calibrated and we are in the process of calibrating the RTK Facet and RTK Facet L-Band.</li>
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<li>Use an antenna that is NGS calibrated to obtain accurate ARPs. The <ahref="https://www.sparkfun.com/gnss-multi-band-l1-l2-l5-surveying-antenna-tnc-spk6618h.html" target="_blank" rel="noopener">SparkFun SPK6618H antenna</a> has been calibrated and we are in the process of calibrating the RTK Facet and RTK Facet L-Band.</li>
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<li>Use an accurate base. A temporary or ‘survey-in’ base will not be accurate. The base needs 24 hours of logging with a <ahref="https://learn.sparkfun.com/tutorials/how-to-build-a-diy-gnss-reference-station/all#gather-raw-gnss-data" target="_blank" rel="noopener">PPP analysis</a>.</li>
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<li>Be within 10km of your base. A baseline that is more than 10km will introduce inaccuracies to the RTK fix readings.</li>
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<li>Correction services are not as accurate as a fixed base. While services such as Skylark and PointPerfect are <em>convenient</em>, they use models to estimate the overall isotropic disturbance. A local, fixed base will outperform a correction service.</li>
@@ -2835,7 +2836,7 @@ <h2 id="how-do-i-get-14mm">How do I get 14mm?!<a class="headerlink" href="#how-d
<p><imgalt="Two serial radios" src="../img/Corrections/19032-SiK_Telemetry_Radio_V3_-_915MHz__100mW-01.jpg" /></p>
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<figcaption></figcaption>
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</figure>
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<p>Serial radios, sometimes called telemetry radios, provide what is essentially a serial cable between the base and rover devices. Transmission distance, frequency, maximum data rate, configurability, and price vary widely, but all behave functionally the same. SparkFun recommends the <ahref="https://www.sparkfun.com/products/19032" target="_blank" rel="noopener">HolyBro 100mW</a> and the <ahref="https://www.sparkfun.com/products/19311" target="_blank" rel="noopener">SparkFun LoRaSerial 1W</a> radios for RTK use.</p>
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<p>Serial radios, sometimes called telemetry or packet radios, provide what is essentially a serial cable between the base and rover devices. Transmission distance, frequency, maximum data rate, configurability, and price vary widely, but all behave functionally the same. SparkFun recommends the <ahref="https://www.sparkfun.com/products/19032" target="_blank" rel="noopener">HolyBro 100mW</a> and the <ahref="https://www.sparkfun.com/products/19311" target="_blank" rel="noopener">SparkFun LoRaSerial 1W</a> radios for RTK use.</p>
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<figure>
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<p><imgalt="Serial radio cable" src="../img/Corrections/17239-GHR-04V-S_to_GHR-06V-S_Cable_-_150mm-01.jpg" /></p>
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