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GPS doesn't give you rotation, a compass does lol. guess what doesn't work near the poles
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Sep 21, 2018 02:23
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no because if you read the case study I linked earlier, or any basic loving navigation text, you’ll find that your course over ground (what GNSS measures) may differ from your heading (what a compass measures) because, get this, we don’t live in a frictionless vacuum poo poo like wind or current makes it so your vector of movement may not be parallel to your orientation wild I know must be hard to grasp for a spherical dunning kruger in a spherical vacuum
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Sep 21, 2018 02:23
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FrozenVent posted:no because if you read the case study I linked earlier, or any basic loving navigation text, you’ll find that your course over ground (what GNSS measures) may differ from your heading (what a compass measures) because, get this, we don’t live in a frictionless vacuum which is why you can use gps to determine your heading. this is very very simple, and that someone else messed up does not make it impossible. Suspicious Dish posted:GPS doesn't give you rotation, a compass does lol. guess what doesn't work near the poles there are a whole bunch of ways to determine your rotation, and one of them is tracking your movements via gps. and you can already 100% for sure fly near the poles with GPS
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Sep 21, 2018 02:26
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gps measures your course over ground not your heading you dumb gently caress this is one of those pedantic differences in which you normally thrive 
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Sep 21, 2018 02:28
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FrozenVent posted:gps measures your course over ground not your heading you dumb gently caress measuring your course over ground over time allows you to determine your headings.
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Sep 21, 2018 02:29
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sup manual microwave setting pal MononcQc posted:I tweeted my microwave thing and lol President Beep posted:but did you get heading? 
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Sep 21, 2018 02:30
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lets talk about breading
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Sep 21, 2018 02:30
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fishmech posted:measuring your course over ground over time allows you to determine your headings. you can calculate heading from SOG it and only if you have the value of the drift vector which in the real world, you do not ever
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Sep 21, 2018 02:31
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President Beep posted:people still won’t recognize amberpos’ supremacy.
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Sep 21, 2018 02:32
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fishmech posted:measuring your course over ground over time allows you to determine your headings. No, it really doesn't, unless you're using some non-technical definition of "heading", but you wouldn't do that, would you? For instance, an airplane that flies in a consistent crosswind will have a heading that never matches the bearing of its ground track, and there is no way to determine the airplane's heading from its bearing or ground track alone. you either need to know its magnetic orientation, or the bearing plus the sum of all forces (wind, etc) acting on the aircraft from the outside.
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Sep 21, 2018 02:38
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graph posted:lets talk about breading Bread is good and tasty. Bake your own bread
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Sep 21, 2018 02:39
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I like bread (most of it)
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Sep 21, 2018 02:39
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i don’t like that bread that has nuts and poo poo in it. get that poo poo away from me.
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Sep 21, 2018 02:41
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i was wrong. fishmech didn’t just drop out and declare victory he’s still going this time
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Sep 21, 2018 02:43
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FrozenVent posted:you can calculate heading from SOG it and only if you have the value of the drift vector ok so you're resulting to some flat earth level "reality is all fake" thing. by your standards it is impossible to ever determine any property of an object ever. Sagebrush posted:No, it really doesn't, unless you're using some non-technical definition of "heading", but you wouldn't do that, would you? you do not need to use magnetic compasses to determine this lmao. and once again you can in fact determine your heading from previous locations.
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Sep 21, 2018 02:46
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gps only gets rotation by assuming your facing in the direction you have moved over the past two positions it needs two data points for location w/ time to measure vector angle it includes no rotational data
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Sep 21, 2018 02:47
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M_Gargantua posted:gps only gets rotation by assuming your facing in the direction you have moved over the past two positions "gps only tells you what time it is in space, it includes no locational data"
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Sep 21, 2018 02:50
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fishmech posted:
No, you can't, because your ground track is the sum of your vehicles intended vector plus any external forces. Unless you have knowledge of what those external forces are (i.e. the momentary wind speed and direction) you cannot determine your heading from your ground track. In a vehicle that is frictionally attached to the Earth, like a car, one can generally assume that the heading is equivalent to the bearing, but that doesn't apply to either aircraft or ships, which are under discussion here. Sagebrush fucked around with this message at 02:53 on Sep 21, 2018 |
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Sep 21, 2018 02:50
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JUST gently caress ALREADY
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Sep 21, 2018 02:51
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they’d have to find each other first.
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Sep 21, 2018 02:52
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fishmech posted:ok so you're resulting to some flat earth level "reality is all fake" thing. by your standards it is impossible to ever determine any property of an object ever. dude, again, I’m a certified navigation officer, I used to drive ships across oceans for a living a single GPS receiver cannot ever give you heading. the difference between current position and previous position is your course over ground, which is the resulting vector of your own motion (the speed of your engine in the direction of your heading) and the motion of the medium you’re in (water or air, wind or current) with some level of adjustment for eg hull fouling, wind effect on a ship, yaw trim on an aircraft, etc if you have the second, you could subtract it from course over ground and get heading. you will not, ever, have this information to a useful degree of precision in the real world thus you need a compass to tell you which way you’re pointing, because as far as the GNSS is concerned you might very well be going sideways have you ever tried walking across a treadmill? k now imagine the drone is on a treadmill
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Sep 21, 2018 02:52
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Sagebrush posted:No, you can't, because your vehicle may have to take a heading that is different from your intended bearing in order to counteract external forces. and you can determine that from the gps data. it is simply harder.
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Sep 21, 2018 02:52
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treadmill was probably not a good metaphor for the ‘pos
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Sep 21, 2018 02:53
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FrozenVent posted:dude, again, I’m a certified navigation officer, I used to drive ships across oceans for a living you can record gps data over time to determine what your heading must be. feel free to continue melting down over this if you want
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Sep 21, 2018 02:54
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President Beep posted:they’d have to find each other first. 
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Sep 21, 2018 02:54
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fishmech posted:and you can determine that from the gps data. it is simply harder. You literally cannot. It is mathematically impossible. all the GPS receiver knows is the displacement between two subsequent points, and it has no way of determining whether that displacement was because the vehicle pointed in that direction and flew forwards, or if it tried to hover in place and was blown sideways, or any combination in between.
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Sep 21, 2018 02:54
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the only thing causing me to melt down is how wrong you are heading =/= course over ground
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Sep 21, 2018 02:55
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fishmech posted:you can record gps data over time to determine what your heading must be. transparent trolling
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Sep 21, 2018 02:55
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fishmech posted:and you can determine that from the gps data. how
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Sep 21, 2018 02:55
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iospace posted:JUST gently caress ALREADY
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Sep 21, 2018 02:57
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here’s how you determine heading with a GNSS: you get two receivers you put the antennas on a very straight piece of steel or something you calculate the difference between the two reported positions adjust for the difference between the board’s alignment and your ship’s / plane centerline tada heading from GNSS, congrats on spending 9k on something a $1 compass can do nb: this is not at all what fishmech was describing, the board or piece of steel or whatever linking the two antennas is very important
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Sep 21, 2018 02:58
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I would just like to point out that I recognize that fishmech thinks they are winning here by getting other people riled up, a la "jokes on them I was only pretending" comic, but I genuinely do enjoy talking about navigational nitpicks like this because they come up a lot as I'm learning to fly planes so it's all cool
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Sep 21, 2018 02:59
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a sustained fishmeching, going for the record
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Sep 21, 2018 02:59
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President Beep posted:they’d have to find each other first. ⭐️ this is your only good post
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Sep 21, 2018 03:00
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loving christ I’ll check in in another 5 pages or so
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Sep 21, 2018 03:00
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Sagebrush posted:I would just like to point out that I recognize that fishmech thinks they are winning here by getting other people riled up, a la "jokes on them I was only pretending" comic, but I genuinely do enjoy talking about navigational nitpicks like this because they come up a lot as I'm learning to fly planes so it's all cool dude let’s be friend and sperg out about navigation how do you feel about sight reduction tables?
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Sep 21, 2018 03:01
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graph posted:⭐️
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Sep 21, 2018 03:02
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FrozenVent posted:dude let’s be friend and sperg out about navigation I've never actually done celestial navigation because I'm only qualified to fly in the day, but it seems like a super cool thing to learn. my uncle was a navigator in the Air Force and he had to learn how to fly by the stars. Super badass
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Sep 21, 2018 03:03
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graph posted:⭐️ time to update my linkedin
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Sep 21, 2018 03:03
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Sagebrush posted:I've never actually done celestial navigation because I'm only qualified to fly in the day, but it seems like a super cool thing to learn. my uncle was a navigator in the Air Force and he had to learn how to fly by the stars. Super badass meh. just use the powder of sympathy imo.
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Sep 21, 2018 03:04
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