https://test-devzone.nordicsemi.com/f/nordic-q-a/89003/deviation-of-nrf9160dk-gnss-measurement-resultWhen using the distance measurement function newly added to the reference point by THE GNSS routine of NCS V2.0.0, it is found that each measurement has a deviation of 30 ~ 60m. What is the cause of the deviation and how to solve iten-USTelligent Community 13 Non-ProductionThu, 16 Jun 2022 08:32:54 GMThttps://test-devzone.nordicsemi.com/thread/372735?ContentTypeID=1Thu, 16 Jun 2022 08:32:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f08602a3-2ed2-4532-92ea-c0e8f0e733f5user2115<p>No problem, happy to help!</p> <p></p> <p>Kind regards,</p> <p>Håkon</p><div style="clear:both;"></div>https://test-devzone.nordicsemi.com/thread/372682?ContentTypeID=1Thu, 16 Jun 2022 01:08:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:950d71ff-32f1-4ed7-8862-ea978ac772f7user116982<p>thx<span class="emoticon" data-url="https://test-devzone.nordicsemi.com/cfs-file/__key/system/emoji/1f604.svg" title="Smile">&#x1f604;</span></p><div style="clear:both;"></div>https://test-devzone.nordicsemi.com/thread/372633?ContentTypeID=1Wed, 15 Jun 2022 15:12:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9c646d07-9e16-41fc-8215-484b4398866euser2115<p>If you are only tracking the bare minimum amount of satellites to obtain a fix, then yes.</p> <p></p> <p>Kind regards,</p> <p>Håkon</p><div style="clear:both;"></div>https://test-devzone.nordicsemi.com/thread/372627?ContentTypeID=1Wed, 15 Jun 2022 14:55:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9679e595-5f64-439b-a837-826aad0d6e8cuser116982<p><span>Is the range of deviations reasonable<span class="emoticon" data-url="https://test-devzone.nordicsemi.com/cfs-file/__key/system/emoji/1f615.svg" title="Confused">&#x1f615;</span></span></p><div style="clear:both;"></div>https://test-devzone.nordicsemi.com/thread/372613?ContentTypeID=1Wed, 15 Jun 2022 14:24:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:eba29250-87ee-48b0-b37c-10bfbcaec0a8user2115<p>Hi,</p> <p>&nbsp;</p> <p>A deviation is to be expected, especially if the dilution of precision is high in the initial fix.</p> <p>You can calculate the GDOP (by squaring tdop+pdop) as described here:</p> <p><a href="https://en.wikipedia.org/wiki/Dilution_of_precision_(navigation)">https://en.wikipedia.org/wiki/Dilution_of_precision_(navigation)</a></p> <p>&nbsp;</p> <p>Here&#39;s the *dop members in the pvt frame:&nbsp;</p> <p><a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.0.0/nrfxlib/nrf_modem/doc/api.html#c.nrf_modem_gnss_pvt_data_frame.pdop">https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.0.0/nrfxlib/nrf_modem/doc/api.html#c.nrf_modem_gnss_pvt_data_frame.pdop</a>&nbsp;</p> <p>And then add a limit for your wanted total DOP in your own application.</p> <p>&nbsp;</p> <p>Easier alternative: You can let the GNSS run for a longer time period after getting a fix, by for instance filtering on the&nbsp;.accuracy field:</p> <p><a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.0.0/nrfxlib/nrf_modem/doc/api.html#c.nrf_modem_gnss_pvt_data_frame.accuracy">https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.0.0/nrfxlib/nrf_modem/doc/api.html#c.nrf_modem_gnss_pvt_data_frame.accuracy</a></p> <p>&nbsp;</p> <p>PS: also make sure you&#39;re not in low accuracy mode:&nbsp;<a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.0.0/nrfxlib/nrf_modem/doc/gnss_interface.html#low-accuracy-mode">https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.0.0/nrfxlib/nrf_modem/doc/gnss_interface.html#low-accuracy-mode</a></p> <p>&nbsp;</p> <p>Kind regards,</p> <p>Håkon</p><div style="clear:both;"></div>