Keine Blitzortung bei Regen

    Hallo,

    ich betreibe die Station 126 in schönen MVP.
    Es werden reichlich Blitze registriert, was bestimmt auch an der guten und Störpegel freien Umgebung liegt.
    Aber kaum das es regnet - geht die Anzahl der georteten Blitz gegen NULL.

    Die Station steht trocken - und wird nicht nass!
    In der Literatur konnte ich auch keine Belege für Dämpfung von Längstwellen bei Regen finden. :)

    Deshalb erlaube ich mir die Frage kennt einer das Phänomen?
    Macht meine Station was falsch?

    Danke für jeden Input.
    Liebe Grüße
    Thomas

    Hi Thomas,

    In the last season, one years ago, we made some experiments about a similar problem, "how, and in which conditions lost our gps,s the reciveing all the satellites" Here is the link to this thread on our forum:

    Problem "lost satellites"
    That time come up this possible explanations:
    - there exists some local noises, dont able to receive signal by the gps unit at the sensor. We havenot devices to monitor independently the gps frequency band, but there are some sources about this problems, and contonuous monitoring at some airports.
    - the increased sun activity has strong effects to the working state of the gps network...
    - we have good souce about this "lost satellite" conditions to all our members, in the Participants table, but on the "private" version of it. This is the A and V character in the station,s records.

    Maybe your problem/question is more special: you found, your station dont able to send data in rain...
    Maybe it is clear, to send valid data to the server, need some "prerequisites":
    - (lightning events in the reciver ranges)
    - processing the received signal:
    it will more processing, if it reach the predefined value at the comparators,
    it will processing as a valid data, if the gps unit is working well, and the system able to get the exact time stamp of the lightning signal.
    This is, where the previous problem with the "lost (gps) satellites" come here.
    In this moment I havenot previously recorded data about the receiving state of our gps,s, but in this moment, writing this notes can see 8 stations in this conditions, with the red V in the Participants table. This means, in a weather conditions with full clouds around Germany, there are 8 stations, dont able to receive valid gps data.
    Maybe you know, the clouds has effects to the microwave frequency used by the gps.
    ------
    In this time we started to examine another aspect of the working state of our gps:
    my fried live in a 12 level high building, in a district, where this buldings located in some ten, or hundred meters distances from each others.
    This "spacial conditions" causes special effects to the receiving of the gps satellites, with many local reflexions, from the big walls...
    My collegue noticed now, there are signiphicant changes in the receiving conditons at his home, if the rain started, and this big walls become wet... Maybe this is not your case, but it seems, we need to make more searches around our gps working conditions.
    best:
    t.janos

    Dear Janos,

    thx for your input. And your right. I checked the LOG-File. During rain the Station loses GPS Data.
    That never happend in my car using the "Navi" - so I never took GPS in consideration for the problem described by me.
    :)

    Sometime it is so simple!

    Greating
    Thomas

    Hallo, dear Thomas,
    The unshure behavioure of the gps receiving and producing data cause more serious problems in the airplan navigations.
    At the time, when I collected some info about this "lost satellite problems", I found a gernam expert, working at the Frankfurt Airport, and he deal with this problems, monitoring the gps frequency with high quality equipments. I red that time one of his paper, and one conclusion was that, one of the most frequently "noise" were in this "reseverd" frequency are the interferences of the german radio amateur network nodes, working on the 1.2 GHz... it is not a good news for us.

    By the way, there is an exellent german web site about all aspects of the gps is the kowoma.de, about the noise/error problems maybe would interesting specially this page:

    or this:

    The situation become worst now, when the sun activity increasing more higher, and cause serious troubles with the satellite comunications
    too.
    In the previous, "active sun" time period, 11 years ago, the gps werenot so important for us in everyday life, and that time this problems connected to only curious long distance radio/tv tansmission events, for the radio amateurs nice DX activity.

    Connected to your recent notices on this Forum, I checked again the occurences of the "lost satellite" situation in our network community, it seems, it is more frequently, as I remember, it was in the last year. Ofcourse this numbers changed quickly, because it reflected to the quiclkly changed phenomen.
    I counted two types of stations:
    1. The stations have in the Participants table green A char and dont receive (temporaly) any gps satellites, you can see 0 in the Satellites column. In the time, I write this the numbers were 10.
    2. The stations, where the gps system indicated the lost synchron state, propagated in the NMEA sentence the V char, this stations were 5
    I dont count the stations with black V chars, because this stations arenot online, and were switched off without any gps data.

    best:
    t.janos