Re: [Gnss-sdr-developers] Help with collecting GNSS signals by using GNSS-SDR and USRP N210
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Re: [Gnss-sdr-developers] Help with collecting GNSS signals by using GNSS-SDR and USRP N210
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From: imtiaznabi8 <imt...@gm...> - 2022-07-13 08:57:10
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<div dir="ltr">how are you generating the spoofing signals? <br>
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</div><div dir="ltr">the sampling frequency of the N210 is 2.5 MHz. if you are using GPS SDR SIM its default sampling frequency is 2.6 MHz. also you will need to generate a 16 bit sample for the USRP. <br>
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</div><div dir="ltr">for better results make sure you've a GPSDO installed and you are using active antenna for receiving the signal only. I my case I was using an Active antenna for the transmission of the signal and noticed that I was jamming the whole spectrum instead of spoofing. <br>
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style="width: 42px; height: 42px; border-radius: 8px; border: 0;" width="42" height="42"></th></tr><tr><td class="normal-text font-14 h-16 lh-16" style="font-size: 14px; line-height: 16px; height: 16px; word-wrap: break-word; word-break: break-all; font-family: 'PingFang SC', 'Hiragino Sans GB','WenQuanYi Micro Hei', 'Microsoft Yahei', '微软雅黑', verdana;" height="16">imtiaznabi8<span>@</span>gmail<span>.</span>com</td></tr><tr><td colspan="2" class="h-23 reset-font" style="font-size: 0; height: 23px; font-family: 'PingFang SC', 'Hiragino Sans GB','WenQuanYi Micro Hei', 'Microsoft Yahei', '微软雅黑', verdana;" height="23"></td></tr><tr><td colspan="2" class="normal-text lh-16 font-12" style="font-size: 12px; line-height: 16px; word-wrap: break-word; word-break: break-all; font-family: 'PingFang SC', 'Hiragino Sans GB','WenQuanYi Micro Hei', 'Microsoft Yahei', '微软雅黑', verdana;"></td></tr><tr><td colspan="2" class="normal-text lh-16 font-12" style="font-size: 12px; line-height: 16px; word-wrap: break-word; word-break: break-all; font-family: 'PingFang SC', 'Hiragino Sans GB','WenQuanYi Micro Hei', 'Microsoft Yahei', '微软雅黑', verdana;"></td></tr><tr><td colspan="2" class="normal-text lh-16 font-12" style="font-size: 12px; line-height: 16px; word-wrap: break-word; word-break: break-all; font-family: 'PingFang SC', 'Hiragino Sans GB','WenQuanYi Micro Hei', 'Microsoft Yahei', '微软雅黑', verdana;"></td></tr><tr><td colspan="2" class="footer font-10 lh-19" style="font-size: 10px; line-height: 19px; color: rgba(0, 0, 0, 0.5); font-family: 'PingFang SC', 'Hiragino Sans GB','WenQuanYi Micro Hei', 'Microsoft Yahei', '微软雅黑', verdana;">Sent from my realme phone</td></tr></table></td></tr></table></td></tr></table></div></td></tr></table></div></div><div class="wps_quotion">On Katarina Radoš <kr...@fe...>, Jul 13, 2022 1:25 PM wrote:<br type="attribution"><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p></p><html>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">Hi,</span><br>
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<span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">we have problem with collecting GNSS signals for GNSS spoofing by using USRP N210 (daughterboard UBX-40), active GNSS antenna (</span><a href="https://www.scribd.com/document/511736732/Datasheet-2-Antena-Gps-Gpsglonass-36-n-Ga" title="https://www.scribd.com/document/511736732/Datasheet-2-Antena-Gps-Gpsglonass-36-n-Ga" style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">GPSGlonass-36-N-GA</a><span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">)
and GNSS-SDR. </span><br>
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Firstly, we followed all steps from GNSS-SDR configuration page and we successfully got the position fixes with downloaded file of raw signal samples as at the
<a href="https://gnss-sdr.org/my-first-fix/" title="https://gnss-sdr.org/my-first-fix/">
link</a>.</div>
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Afterwards, we tried to get the position fixes with active GNSS antenna but unsuccessfully. We set all the parameters as at the instructions at the
<a href="https://gnss-sdr.org/conf/" title="https://gnss-sdr.org/conf/">
link</a> and ran 'my_GPS_receiver.conf' file. As the result, we got printed 'D' (please see screenshots 1 and 2 attached). We tried to solve this problem by following the instructions at
<a href="https://kb.ettus.com/USRP_Host_Performance_Tuning_Tips_and_Tricks#Thread_Priority_Scheduling" title="https://kb.ettus.com/USRP_Host_Performance_Tuning_Tips_and_Tricks#Thread_Priority_Scheduling">
ETTUS page</a> but nothing worked in our case.</div>
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Then, we tried to set the sampling frequency to 2MHz and there was no printed 'D' after running the conf file. However, we didn't get the position fixes and we only got 'Loss of lock in channel' (screenshot 3). We searched for the solution and we wonder if
missed something or we do not have all necessary equipment (we saw that bias-tee is needed for some daughterboards).</div>
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We would be thankful if you could help us with our problem.</div>
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Thank you in advance and best regards,</div>
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Katarina Radoš and Marta Brkić</div>
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