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Probleme cu semnalele GPS azi in București?
Last Updated: Sep 26 2019 19:28, Started by
cipx2
, Sep 19 2019 15:25
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#1
Posted 19 September 2019 - 15:25
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In ultimele zile am folosit navigatia zilnic, inclusiv ieri seara. Azi intre 10 si 12 telefonul meu, Galaxy A3, n-a mai receptionat semnal gps. Abia receptiona 1-3 sateliti cu 10-20% din taria medie a semnalului.Intre aseara cand mergea si azi cand n-a mai mers, n-am instalat nimic, n-am facut update, n-am 'umblat' la nimic la el, doar apeluri si putin browsing.
Am tot repornit sistemul intre 10 si 12, am folosit toate programele instalate, acelasi rezultat. Mi-am zis ca a crapat telefonul (receptia gps) si am renuntat pe la 11:30cu gand sa-mi iau telefon nou. Sun pe altcineva din familie, verifica gps-ul de pe masina si iphone-ul propriu si spune ca nu are probleme cu niciunul. Zice ca-mi da imprumut un alt Samsung dar cand ajunge acasa si-l verifica, nici la ala nu mergea gps-ul. WTF1?! La 15:30 incerc din nou la telefonul meu si acum merge de rupe, asa cum trebuie. WTF2?! De la 12, cand am renuntat sa mai incerc, n-am mai umblat la telefon, doar am dat si am primit cateva apeluri. A mai experimentat cineva asa ceva? Tx |
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#3
Posted 19 September 2019 - 15:32
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Dispozitivele mai vechi sunt afectate de un rollover bug.
https://www.theverge...evices-affected Quote
Do you own any GPS devices or use equipment that relies on GPS to function? If so, now is probably a good time to check whether or not those products are protected against the GPS Week Number Rollover issue — a sort of mini Y2K Bug for GPS receivers that will come into effect from April 6th this year. The bug isn’t disastrous and should only hit a small number of GPS devices, but for those impacted the results could be severe, resetting the receiver’s time and corrupting its location data. Only older devices are at risk, though, and if you’re just using a commercial device the fix is quite simple: just check that its software is up to date. Quote
The rollover issue itself is caused by the fact that GPS systems count weeks using a ten-bit parameter. This means they start counting at week zero and reset when they hit week 1,024. The first count (or “GPS epoch”) started on January 6th, 1980, and the first reset took place on August 21st, 1999. That means the next one is due April 6th this year. When the rollover happens older devices may reset their date, potentially corrupting navigation data and throwing off location estimates. GPS relies on precise timing data to operate, and each nanosecond the clock is out translates into a foot of location error. Quote However, it’s worth noting that just because the next GPS week reset is scheduled for April 6th, actual errors might kick in later. As telecoms testing company Spirent noted in a blog post, some devices may have restarted their week count later — for example, when the manufacturer compiled their firmware. As Spirent’s Guy Buesnel writes, that means “the impact won’t necessarily be felt on rollover day itself. In fact, it’s much more likely that an affected receiver won’t start outputting erroneous data until long after the 6 April 2019.” |
#4
Posted 19 September 2019 - 15:37
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Nori foarte grosi sau explozie solara. |
#5
Posted 19 September 2019 - 15:39
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Si eu am observat ca au scazut nr. satelitilor din constelatia GPS (se joaca americanii, scot si baga in teste sateliti noi? nu stiu) Noroc cu europenii nostri ... + rusii.
Dar in general am peste 15-16 sateliti activi cu SNR peste ~30-35 db Edited by Rhesus, 19 September 2019 - 15:40. |
#6
Posted 19 September 2019 - 15:41
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Aceeasi chestia am patit-o acum 2-3 zile in urma.
Cam in aceeasi perioada de timp ..ceva 12:00 -13:30. |
#7
Posted 19 September 2019 - 15:42
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Poate fi si sun outage, dar ala era in martie sau octombrie.
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#8
Posted 19 September 2019 - 16:02
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Acum, Cluj Napoca
Attached Files
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#9
Posted 19 September 2019 - 16:31
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Care nori la ce seceta este. |
#10
Posted 19 September 2019 - 16:50
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Din cate stiu eu, semnalul GPS nu are probleme cu norii sau cu ceata.
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#11
Posted 19 September 2019 - 16:51
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Alea vechi și foarte vechi . Sunt șanse mici și foarte mici sa aibă probleme chiar și un dispozitiv mai vechi .
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#12
Posted 19 September 2019 - 16:54
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E totusi mai raspandit bug-ul decat ne imaginam. Dispozitivele Apple pe 32bits, care sunt EOL de mult si fara actualizari de ani de zile, au primit in august un update special pentru aceasta problema.
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#14
Posted 19 September 2019 - 17:53
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Ai de mine! SNR ~52 dbm
In mare, eu asta am remarcat, in general, in a doua parte a lui 2019: mai putini sateliti activi din GPS. Fie ca am 13/20 sau 22/30 activi, majoritatea sunt Glonass, Beidou si cativa europeni (pana devine si Galileo full operational). GPS vreo 6-7-8 si foarte fluctuant - spre deosebire de celelalte GNSSuri Attached Files
Edited by Rhesus, 19 September 2019 - 17:57. |
#16
Posted 19 September 2019 - 19:31
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Quote Din cate stiu eu, semnalul GPS nu are probleme cu norii sau cu ceata. Mai demult am avut un telefon care avea si mufa ptr antena externa. Cand erau nori grosi de furtuna nu prindea niciun satelit cu antena interna. Cu ce externa reuseam sa prind ceva. |
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#17
Posted 19 September 2019 - 19:35
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Pe ploaie nu mai merg navigatoarele ? Eu am un tablet care prinde si in tunele.
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#18
Posted 20 September 2019 - 09:18
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Nu prinde in tunele. Aproximeaza.
Practic stie ce tunel este - lungimea sa si in baza vitezei avute la intrare iti da impresia ca GPS-ul merge in continuare. Algoritmul a aparut acum cativa ani. Pana atunci cand intrai in tunel se termina tot. |
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