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Author Topic: Global Navigation Satellite Systems -- tutorial  (Read 27728 times)

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Offline DZ PLEASE

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Re: Global Navigation Satellite Systems -- tutorial
« Reply #120 on: September 28, 2017, 04:42:42 PM »
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  • .
    I'm simply posting a thread on GNSS and these retards keep clogging the thread when nobody's interested in their nonsense. That's what a troll does. But they're allowed to do it so that CI gets more hits that way, and the post count goes up, and the readership goes down.
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    Whatever.
    .
    I understand. 

    Q: Just what error/s of the modern world are you fighting thereby?

    Offline Truth is Eternal

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    Re: Global Navigation Satellite Systems -- tutorial
    « Reply #121 on: September 28, 2017, 04:44:11 PM »
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  • .
    Does this make you happy? Probably not.
    .

    Thank you very much Neil. Yes, this makes me very happy. :applause:


    Offline Neil Obstat

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    Re: Global Navigation Satellite Systems -- tutorial
    « Reply #122 on: September 28, 2017, 04:47:43 PM »
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  • .
    Great. Now where was I?
    .

    Unit 2. GNSS computational methods I - Coarse positioning »

    2b. Satellite orbital information: ephemerides



    Each GNSS constellation has its own particular way of providing positional information. In the case of the U.S. GPS constellation, every GPS satellite broadcasts a “navigation message,” which contains the information needed to identify ALL the satellites and compute each one’s approximate position in orbit.

    The network of ground-based observing stations constantly tracks the satellites and computes predictive models of each satellite’s orbit. The predicted orbital parameters for a given satellite are recorded in a docuмent called an “ephemeris” (plural, “ephemerides”). Since satellite orbits vary over time, each ephemeris needs to be updated regularly. This is carried out by the ground-based Master Control Station, and transmitted to the GPS satellite constellation.


    An ephemeris provides the parameters that can be used to calculate the position of a satellite along its orbit at any moment in time. 
    An almanac provides the ephemerides for an entire constellation of satellites

    The navigation message broadcast by each satellite includes its own ephemeris (called the “broadcast ephemeris”), updated at frequent intervals. It also contains the “almanac,” a less-frequently updated collection of the ephemerides for ALL GPS satellites in the constellation. Because the almanac is updated at much longer intervals, the orbital parameters are less accurate than the broadcast ephemeris from each individual satellite.
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    Offline DZ PLEASE

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    Re: Global Navigation Satellite Systems -- tutorial
    « Reply #123 on: September 28, 2017, 04:49:10 PM »
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  • Even mud larks can be paid to leave...

    Offline Neil Obstat

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    Re: Global Navigation Satellite Systems -- tutorial
    « Reply #124 on: September 28, 2017, 04:54:01 PM »
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  • I understand.

    Q: Just what error/s of the modern world are you fighting thereby?
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    As the thread shows, this concept and series is fighting the erroneous claim that satellites do not exist.
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    Now, if it were not for the incessant and retarded posts of Truth is Transitory, critics could accuse me of "making it up" and "There isn't anyone in the modern world who denies the existence of satellites."
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    But here they are, for the world to see.
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    Of course, there may be some who would claim there are no satellite-deniers here on this thread.
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    Actually, I'd rather deal with the accusation of satellite-denier than h0Ɩ0cαųst-denier.
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    Offline DZ PLEASE

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    Re: Global Navigation Satellite Systems -- tutorial
    « Reply #125 on: September 28, 2017, 05:01:17 PM »
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  • .
    As the thread shows, this concept and series is fighting the erroneous claim that satellites do not exist.
    .
    Now, if it were not for the incessant and retarded posts of Truth is Transitory, critics could accuse me of "making it up" and "There isn't anyone in the modern world who denies the existence of satellites."
    .
    But here they are, for the world to see.
    .
    Of course, there may be some who would claim there are no satellite-deniers here on this thread.
    .
    Actually, I'd rather deal with the accusation of satellite-denier than h0Ɩ0cαųst-denier.
    .
    So you are, at least in general, contending with "the other white meat" them. 

    Offline Neil Obstat

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    Re: Global Navigation Satellite Systems -- tutorial
    « Reply #126 on: September 28, 2017, 05:34:37 PM »
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  • So you are, at least in general, contending with "the other white meat" them.
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    I'm not Moslem. I have nothing against pork.
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    Nor do I go around preaching, "The earth is flat!" like a Moslem.
    .
    How many Moslems use GNSS while they deny the existence of satellites?
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    Is Truth is Transitory a Moslem?
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    That would make a lot of sense, actually. They both act like pit bulls, as you adroitly observed!!
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    Offline Neil Obstat

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    Re: Global Navigation Satellite Systems -- tutorial
    « Reply #127 on: September 28, 2017, 05:40:21 PM »
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  • Each GNSS constellation - depends on which system you're talking about
    In the U.S. they're called a GPS constellation
    every GPS satellite broadcasts a “navigation message”
    navigation message -- broadcast by each satellite
        -- contains the information needed to identify ALL the satellites in the constellation
        -- contains information needed to compute each satellite's approximate position in orbit

    network of ground-based observing stations
    constantly tracks the satellites
    computes predictive models of each satellite’s orbit.
    predicted orbital parameters for a given satellite
          recorded in a docuмent called an “ephemeris
        ephemeris ------> plural = “ephemerides
    satellite orbits vary over time
    each ephemeris needs to be updated regularly
        ground-based Master Control Station performs regular updates of satellite orbits
        updated orbits (ephemerides) are transmitted to the GPS satellite constellation


    An ephemeris provides the parameters
    used to calculate the position of a satellite
    along its orbit at any moment in time
    An almanac provides the ephemerides
    for an entire constellation of satellites

    navigation message is broadcast by each satellite
       it includes its own ephemeris
       this ephemeris is called the “broadcast ephemeris
              updated at frequent intervals
              contains the “almanac”
    almanac is the less-frequently updated collection of the ephemerides for ALL GPS satellites in the constellation
    almanac is updated at much longer intervals
    orbital parameters are less accurate in almanacs than the broadcast ephemeris from each individual satellite
    .

    What computes each satellite's orbit information?
    What does an almanac provide?
    Which is plural, ephemerides or ephemeris?
    What do ground-based observing stations do?
    What kind of updates does a Master Control Station provide?
    Where does a GPS satellite constellation obtain its ephemerides?
    Does any particular satellite receive and use all the ephemerides broadcast?
    What component sends out a navigation message?
    What is used to compose a navigation message?
    Why are GPS satellites grouped into constellations?
    When a particular satellite leaves Libra and moves into Sagittarius does it change constellations?
    What is the almanac a collection of?
    Which is updated more often: almanac ephemerides or broadcast ephemerides?
    Which is more reliable, almanac ephemerides or satellite signals?
    Why bother with a less reliable set of data?
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    Offline Neil Obstat

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    Re: Global Navigation Satellite Systems -- tutorial
    « Reply #128 on: September 28, 2017, 05:49:32 PM »
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  • .
    Notice, as soon as I posted a picture again of several satellites together in space Truth is Transitory went on a nice long break.
    .
    Coincidence? 
    .
    Funny, because he didn't run away when I posted it the first time.
    .

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    Offline DZ PLEASE

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    Re: Global Navigation Satellite Systems -- tutorial
    « Reply #129 on: September 28, 2017, 05:52:53 PM »
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  • .
    I'm not Moslem. I have nothing against pork.
    .
    Nor do I go around preaching, "The earth is flat!" like a Moslem.
    .
    How many Moslems use GNSS while they deny the existence of satellites?
    .
    Is Truth is Transitory a Moslem?
    .
    That would make a lot of sense, actually. They both act like pit bulls, as you adroitly observed!!
    .

    I hear you but what I'm, granted rather ineptly, trying point out is that there seems to be a "mixed signal" if you'll pardon the expression:

    1. On the one hand you seem to be saying that you are, simply and solely, offering some instruction.
    2. However, on the other you seem to be also acknowledging that this is an actual point of contention deliberately being offered as such, which is only reinforced by its categorization under "... errors of the modern world"; this only justifies their likewise admittedly inept as well as inane commentary, not that "they" need excuse.

    If you framed it such that you were merely teaching that taught by others, regardless of its in/accuracy, then the only basis for protest would be if you were deviating from the subject matter.

    At the very least you could then protest any actual irrelevancies introduced such as "that's not true!"

    Example: a Catholic giving a course on Hegelian Dialectics or, more generally, Communism.

    Offline DZ PLEASE

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    Re: Global Navigation Satellite Systems -- tutorial
    « Reply #130 on: September 28, 2017, 05:54:21 PM »
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  • .
    Notice, as soon as I posted a picture again of several satellites together in space Truth is Transitory went on a nice long break.
    .
    Coincidence?
    .
    Funny, because he didn't run away when I posted it the first time.
    .

    .

    I hear you, but do you?


    Offline DZ PLEASE

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    Re: Global Navigation Satellite Systems -- tutorial
    « Reply #131 on: September 28, 2017, 05:56:21 PM »
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  • .
    I'm not Moslem. I have nothing against pork.
    .
    Nor do I go around preaching, "The earth is flat!" like a Moslem.
    .
    How many Moslems use GNSS while they deny the existence of satellites?
    .
    Is Truth is Transitory a Moslem?
    .
    That would make a lot of sense, actually. They both act like pit bulls, as you adroitly observed!!
    .

    You seem rather tenacious yourself, with all due; this isn't necessarily a bad thing, and can sometimes be indispensable.

    However, in the case of idiocy, such as with Flat Earth "SCIENCE!"...

    Offline ManuelChavez

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    Re: Global Navigation Satellite Systems -- tutorial
    « Reply #132 on: September 28, 2017, 05:57:55 PM »
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  • So I am assuming that the photos of the ISS crossing in front of the sun were rejected as evidence. Is that correct, and if so, why?

    Offline Neil Obstat

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    Re: Global Navigation Satellite Systems -- tutorial
    « Reply #133 on: September 28, 2017, 06:09:27 PM »
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  • So I am assuming that the photos of the ISS crossing in front of the sun were rejected as evidence. Is that correct, and if so, why?
    .
    As far as I could tell the flat-earthers did not specifically reject your evidence but ran off instead on a flurry of obfuscation, which is their wont when they're frustrated by hard evidence.
    .
    So you did a good thing. Thank you.
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    Offline DZ PLEASE

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    Re: Global Navigation Satellite Systems -- tutorial
    « Reply #134 on: September 28, 2017, 06:16:35 PM »
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  • I think that Neil and others have quite a bit to offer education-wise; it would just be more useful, going with the 'signal' theme, to cut as much clutter as feasible including being better positioned (DOH!) to do so.

    Perhaps others would follow suit, including the FEists.

    "Here's what FE teaches(presuming that there is a cohesive, coherent corpus), and this is why"; any wrangling, for the sake of better order and reason if naught else, being taken 'elsewhere'.

    As can be seen with far greater minds, Catholic then otherwise, the understanding "phase" is distinct from the "objection", argumentation, and disputatio ones.