Can GPS transmission time be the same for two different ephemerides?

Discussion in 'GPS Technical Discussion' started by johnl, Dec 10, 2019.

  1. johnl

    johnl

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    I am seeing a RINEX navigation file where I have two different ephemerides for the same satellite at different times. Nothing surprising. The thing is that they both have the same transmission time, which I understand it is derived from the Z-count from the Handover word. Wouldn't the transmission time need to be different?

    I'm not totally familiar with the GPS navigation message. Is it possible that a HOW is sent, then a word containing a GPS ephemeris for a particular SV and then a new word containing ephemeris (different IODE) for the same SV sent again?
     
    johnl, Dec 10, 2019
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