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- What is the difference between GPS, GNSS and RNAV?
GNSS is an umbrella term that encompasses GPS as well as other nations' satellite systems that achieve essentially the same capability RNAV is the aircraft capability that allows you to navigate from point to point, defined by Latitude Longitude and independent of any ground-based system
- gnss - What are satellite time, GPS time, and UTC time? - Aviation . . .
It would appear that at least these two GNSS providers reference back to UTC UTC itself is derived from TAI (International Atomic Time), which is itself based on a weighted average of 400 atomic clocks spread around the world I did see one thing in reading that TAI article that I do not have the experience to resolve
- gnss - Why dont planes (mostly airliners) primarily use GPS for . . .
Some regulations recommend low end-to-end latency AC 20-165 for ADS-B recommends total measurement-to-transmission latency of less than 2 seconds, and "uncompensated latency" (e g after extrapolation) of less than 0 6 seconds You bring up lots of other good points like that regulations sometimes require backup in case of loss of GNSS
- gnss - What is the difference between SBAS and SBAS PA mode on my FMS . . .
We have a Collins FMS, and in the GNSS control page it tells you what mode it is operating in In the instance that I checked it, it said " SBAS PA" The flight manual said that it can operate in "SBAS" as well, leading me to believe that there is a difference between the two
- gnss - Difference between accuracy, integrity, availability, continuity . . .
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- gnss - What are the lateral sensitivities of GPS approaches? - Aviation . . .
What are the lateral sensitivities of each of the WAAS and LNAV approach? Is the lateral sensitivity of WAAS the same as that of the localizer, which is 3 to 6 degrees? What about the LNAV approach?
- gnss - how can I verify the aircraft GPS is what TSO? - Aviation Stack . . .
My understanding is that TSO-C 129() equipment and TSO-C 196() equipment are RAIM, and TSO-C145() and TSO-C146() are WAAS
- gnss - What is GPS HIL in laymans terms? - Aviation Stack Exchange
GNSS Horizontal Integrity Limit Horizontal Protection Level is a measure of GNSS position error integrity that's very important in RNP operations and RAIM, but it has an obtuse definition in aviation regulations like DO-229D that's hard to apply in practice: [HPL] describes the region assured to contain the indicated horizontal position
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