Hi all! Does anyone have any idea or experience regarding this problem?
Best regards, David -- [image: logo_170x100px.png] <http://www.gradiant.org/> David Zamorano Fernández Investigador - Desarrollador | Área de Comunicaciones Avanzadas Researcher - Developer | Advanced Communications Department Ph. (+34) 986 120 430 Ext. 3012 dzamor...@gradiant.org <napell...@gradiant.org> | www.gradiant.org [image: Iconos Redes Sociales GRD Firma email-01] <https://www.facebook.com/GradiantNews/> [image: Iconos Redes Sociales GRD Firma email-02] <https://twitter.com/Gradiant> [image: Iconos Redes Sociales GRD Firma email-03] <https://www.linkedin.com/company-beta/769728> [image: Iconos Redes Sociales GRD Firma email-04] <https://www.youtube.com/user/ComunicacionGRD> Take care of the environment. Try not to print this email. The information contained in this email message may be confidential information, and may also be the subject of legal professional privilege. If you are not the intended recipient, any use, interference with, disclosure or copying of this material is unauthorized and prohibited. Please inform us immediately and destroy the email. Thank you for your cooperation. El mar., 4 sept. 2018 a las 17:31, David Zamorano Fernández (< dzamor...@gradiant.org>) escribió: > Hi all! > > We have implemented a TDMA receiver using the GPS signal to discipline the > internal clock of the E310 and thus reduce frequency deviations. The > system works fine, but in some cases, frequency drifts appear and the slots > start to be erroneous (wrong CRC). The number of visible satellites has > also been controlled and abruptly goes from a high number (12-13) to a few > (1-2) or even none. > > The GPS antenna is outside. The system has been tested with different > antennas and the behavior has been the same. > > Is there any kind of known bug in the gps daemon related to this? Is > there any other reason why this may be happening? > > I attached an image of a large message capture. You can see how there are > three zones where the frequency drift starts to appear and the slots start > to be erroneous (green circle = ok and red circle = error). > > -- > > > [image: logo_170x100px.png] <http://www.gradiant.org/> > > > > David Zamorano Fernández > Investigador - Desarrollador | Área de Comunicaciones Avanzadas > Researcher - Developer | Advanced Communications Department > > > > Ph. (+34) 986 120 430 Ext. 3012 > dzamor...@gradiant.org <napell...@gradiant.org> | www.gradiant.org > > [image: Iconos Redes Sociales GRD Firma email-01] > <https://www.facebook.com/GradiantNews/> [image: Iconos Redes Sociales > GRD Firma email-02] <https://twitter.com/Gradiant> [image: Iconos Redes > Sociales GRD Firma email-03] > <https://www.linkedin.com/company-beta/769728> [image: Iconos Redes > Sociales GRD Firma email-04] > <https://www.youtube.com/user/ComunicacionGRD> > Take care of the environment. Try not to print this email. > The information contained in this email message may be confidential > information, and may also be the subject of legal professional privilege. > If you are not the intended recipient, any use, interference with, > disclosure or copying of this material is unauthorized and prohibited. > Please inform us immediately and destroy the email. Thank you for your > cooperation. >
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