α-GEO GeoPuls. Tehniskā specifikācija. Atbildes uz jautājumiem. Par GNSS.
Hi everyone! Today we will talk about the Alphageo GNSS equipment - a new, revolutionary, perhaps in one sense And visiting me today is Jelgava Technical College representative Egita, who is studying there Which year are you on? Third In her third year and also doing an internship at our company And there is, of course, the possibility of talking about the technical specification for this particular machine and what the possibilities are And if Egita has any questions, she can freely ask Because today Egita will tell us about what's inside the box where the receiver comes And also about the technical specification - what could really be so revolutionary and interesting for you - surveyors and not only Well, then, shall we start with the unpacking? Yes, don't be shy - feel free to take it and go! This package contains the device itself, which seems light as it is only 300 grams heavy! Yes, 300 grams light I would say, not heavy You can hold it in your hand or screw it onto the pole, but it comes not only with an adaptor for threaded GNNS pole But also with - what else was there? With the point Yes, you see - here's a little spike that you can easily screw in and take your measurements Why do you think it is needed? To determine the accuracy? I don't know! To determine accuracy - no It's a useful tool if you need to measure an element that's on the wall, maybe a wall mark, something like that You can also use it in the same way, by placing and measuring How accurate do you think this device is? Yes, I don't know, I don't remember! Yes, and that's why there is a technical specification, which also specifies the accuracy of the RTK measurements, which are 8 mm in the horizontal plane and 15 mm in the Z axis As with any standard, normal GNSS device - it's capable of measuring within 2 cm accuracy So, okay - what's next? Then we also have the adapter itself, with which we can screw the device to the pole, for standard measurement Yes, as I mentioned - screw it in and you can switch to the standard GNSS thread and use as normal Everything is assembling well, everything is very good and fine And of course, the box comes with the charging cable and adapter Yes, maybe take the adapter out and show it, please Because the adapter also - as I said in the previous videos - you have to make sure that the adapters are original, because it is important how much power you are charging your equipment with Here it says "Output: 5V, 2A" - so a minimum of 2 amps is needed to charge this charming little device And of course, the wire comes standard It's probably important for the cable to be original too, isn't it? Yes, it can be original, but look You see, there are special graphite filters to absorb noise and, of course, it can be used as a data cable And that way you won't lose your data somewhere on the way from the machine to your computer Well - we've opened the box Next, we can probably talk a bit with you What might not be clear to you in the technical specification? And why exactly nowadays... We'll put it here And what may be confusing you And what is not clear to you from the technical specification? I have a question about how do satellites work and what does it mean when you have different types of them? I only knew there was GPS, but there are others with different names - GLONASS, BeiDou and so on But what is the difference and what does it improve? Well, in general, today it is important to use all 4 satellite systems Yes, they are GPS, Glonass, BeiDou and Galileo US with those systems So GPS is the American system that was there from the start Then came Glonass - the Russian satellite system that orbits the globe Then Galileo and BeiDou I can say that BeiDou is probably a very good satellite system at the moment and of very high quality, because they have fixed satellites that are - imagine - 20 000 km away from Earth This is what a fixed satellite means Stationary satellite - the Earth rotates and there is a satellite 20 000 km away that is also moving at the same speed as us Because the other satellites are lower down and therefore orbiting all the time Un satelīta pārklājums ir ļoti svarīgs Why are they slower when they are closer? They have to travel less- No, they're not slower, but the thing is that the ones that are lower, they go in their orbit around the globe and give us the frequency signal that the GNSS equipment receives And so it is that the further we are from the equator - north or south - then there are fewer satellites with weaker signals Because they all revolve around the globe I understand now, yes Because they're like a ring around the world You've seen the planet Saturn with the big rings around it - here we also have satellites orbiting the globe But they go around... This means that the best results are closer to the equator, but the further away from the equator, the worse, less accurate the results I can tell you this - let's say you are measuring with GNSS equipment and you have to measure a point with the highest precision, then you have to look for less trees, less buildings to the south so that there is no interference, because there are more satellites there There is also one small nuance when using the IMU system It's a tilt sensor And which way you tilt the tilt sensor depends on your accuracy This means that if you measure the corner of a building and tilt more to the north, you may have an accuracy of 3-4 cm But try turning your GNSS to the south - you'll see a different result - it will be better with higher accuracy because there are more satellites that way And so you'll get corrections, calculations faster and easier Even this device is mentioned as being able to measure at 120° This means that at a tilt angle of 120° IMU technology today is not rocket science for GNSS applications And if we look at what 120° is Let's say this is 0°, 90° and here is 120° You can measure to either side with this, here's the angle, using this device with about 2 cm error Because the IMU system tried to compensate for the error So at 120° there will be a 2 cm error, but if I hold it straight, will it be better? There it is - you get Normally, the accuracy received by GNSS equipment in RTK mode is 2-3 cm, but if your tilt angle goes up to 120°, it means an error will come along Add 2 cm to 2 cm And the IMU system is the one that tries to smooth it out so that 120°, say, has the same accuracy as if you were holding it straight 2 cm is straight, 2 cm + 2 cm is 120° So when you measure an element, you're trying to get the best accuracy Well, it won't be the same as it would be if you hold it upright - unfortunately it's not like that Up to 30° angles, which are approximately as follows, the accuracy does not change But maybe it won't change much up to 60°, but when you go above 90° you have to realise that the number of satellites decreases Because we don't have satellites coming from below - only from above And if you have that side covered, the satellites get smaller, the accuracy gets worse and you don't get the result you want Does the battery life change at all with the weather? Yes, battery life, of course, is affected The technical specification says 12 hours If you can work with it for 12 hours, that's under ideal conditions of +22-24 °C outside Of course, when we go out in the field For example, now it's winter -10°C, -20°C, it can drop to 30-40% at once Because lithium-ion batteries can't work properly in such weather conditions In the rain What can affect your accuracy and results - rain, snow and all that, of course Because, however, it is interference with the satellite signal, because everything depends on the signals received - as soon as there is interference, we immediately get worse results It also takes longer to get results - not a few seconds, but longer Ionospheric and tropospheric disturbances, which are also very important For example, a few days ago the ionosphere was pretty bad - meaning that the signal coming through the atmosphere was disrupted and didn't arrive in time The signal came with delays What is the impact on the result if there are delays? Does it become inaccurate? Yes, imagine a satellite is flying, it has already gone further in its orbit, say 200 km, but you received the signal when it was still in its original position And this means that the almanac (the position of satellites in the sky) has been figured into the system The satellite has flown a long time ago, but the signal has only just arrived And the system also has its own clock inside, which takes information from the GPS clock and when the time signals don't match, then you can't get an accurate and good result And then you think straight away - call the manufacturer No, no, no Yes, the system doesn't work for you straight away, and so on And there's the knowledge of GNSS technology in general Yes, well, sometimes you have to look at the weather forecasts, go to the website to check if there's a magnetic storm and all that It was mentioned that the device tries to ignore the magnetic field to make it easier to Yes, this device has new standards and filters built into it that try to minimise the effects of magnetic fields on the device - We see that the casing is made of plastic, but inside all the parts are specially treated to reduce the effects of magnetic fields How to understand it - what is the number of channels, how does it work? Yes, as if other experts tell us that the number of channels is not necessary, because you can do with 30, 50 channels - they're absolutely right! 10 is also maybe enough to get good accuracy But the number of channels is like a computer - what frequency the processor is, how fast it processes data And every satellite sends it frequencies - a satellite not only has bands, but also frequencies And it sends all that information to your machine, and if that channel is open, it uses it But if for example the channels are busy, then the next satellite can't give more information because it is blocked by others that have gone because they are still in use You see, it's like, say, a beehive - the bees fly, one works, makes honey and so on - it's all lovely And there are only 100 cells where they can fly in, but there are 200 bees - what do the others do? Stand in line! And so here it is that - yes, of course 1408 channels is a lot That's an insane number - we can't even fill half of them yet Are they all possible to fill? That's not all the satellites possible, that's how many "Beehives" this machine has That is, how much it can receive at a time Yes, it can receive a lot of frequencies This means that there are always free channels available, which means that we can always receive additional information from satellites And this is very important This means that if he can always capture so much that he doesn't use all of them, then he always captures everything very quickly because it is designed for a very large number of, as you said, "bees" There are plenty of "bees" to accommodate, but it's not necessary for it and it's easier to do the job Of course - as with a processor - if you give it less to do - you'll open Word to print, for example, or a 3D machining program For example, reconstruction, 3D modelling You see immediately - yes, full processor, full processes and unable to process my requests Then there is the "cold start" and "hot start" - what is that supposed to mean? It mentions a "cold start" of one minute and a "hot start" of 15 seconds - how does that work? It's not to do with time, for example to work in winter or summer - I'll say that straight away What does "Cold Start" mean? So, for example, when I pick up the device, press the button and the system switches on And wait a minute - of course go outside When the system starts, it will check the status of all sensors - it will take you up to 1 minute Yes, it's a "cold start" - the definition has nothing to do with the weather "Hot start" - once you have connected to your device, you are in the field and, let's say, you have disconnected via Bluetooth from the controller But he is still working and the device is switched on? Yes On but not receiving corrections because, for example, they were switched off And then when you reconnect to the device, within 15 seconds you'll start It's very fast And I had before, when we were talking about cold and hot weather Surveyors, for example, with equipment from 2005-2006 said: "It takes me no more than 30 seconds to turn on my device!" A question was asked - cold start or hot start? And then we explained what it means Of course, 30 seconds is perfectly normal for a 2005-2006 machine Is it the hot start? Yes This way it stays on for up to 2-3 minutes while everything goes through And of course, there are now other processors and other speeds As we can see, to process 1408 channels you need a good processor, which is what's inside here - just like in a computer Something about speed? Because there is Hz Hertzes from 1 to 50 Why is this important? In surveying, we get corrections once per second - that's 1 Hz We are perfectly happy with 1 Hz, but this device can receive up to 50 Hz This means if your base station is configured for 50 Hz - Usually used for machine control (3D machinery) - where an excavator and a grader go, because they don't need to get corrections every second, they need to get them 50 times a second And that means, if it's 50 Hz, does that mean it's getting corrections 50 times a second? Yes, 50 times a second corrections A surveyor walking in the field - he gets corrections once a second And also - when we go, for example, 5 km/h, 6 km/h - that's a few metres per second And walking, for example, 3 metres in a second So we have received the correction here, we move 3 metres in a second and we will receive the new correction only then It is also one of the most important things When a surveyor measures ditches, for example, he goes inside the ditch and the connection disappears He loses the network - happens in the forest And he got the corrections when he was at the top of the slope He received corrections once per second He has already crawled into the ditch, but there is no coverage, and then the controller shows that he last received a correction 5 seconds ago But he's already standing there measuring And then there's the problem that the height markers "jump" around It is therefore imperative to see at what time you received the correction But it's all in the controller And let's say this case with 50 Hz - he could solve several problems from that point of view Then there's a chance sooner, when you go into a ditch and the network coverage disappears, then sooner... I don't quite understand No, what I told you is a story from life, as they say But to address your question directly, the 1 Hz and 50 Hz range is an option that this equipment can use And it's instantly available - no need to activate anything Ko nozīmē tas RTK inicializēšanas laiks? RTK initialization time is up to 5 seconds - this means that the first adjustments will be received within 5 seconds So he will make his own measurement, correction in 5 seconds? Well, not exactly - it's like when you turn on the device, you have a very good internet connection, like 4G, and you get a correction - within 5 seconds you'll be initialised Because there's this thing where when we turn on the machine - experienced surveyors know - a "Single" appears with a metre and a half, two metres Then goes "Float" 15 - 20 cm And then "Fixed" And so from this time when you get from "Single" to "Fixed" is only 5 seconds Other equipment takes longer Then you can start using it and get to work Here's what happens That almost 100% initialisation - what is it? Initialisation "reliability"? This is its stability Initialisation stability - how stable the signal can be held - 99.99% So it's almost 100%, but never say 100%, because sometimes ... happens... Because something can happen to the network at other times Also, as I have already mentioned, the operator in the forest sometimes gives up Differences in terrain and so on And satellites, ionosphere, troposphere and so on Time accuracy? Time accuracy? Yes Is 20 nanoseconds the precision of time? Yes, the accuracy is 20 ns - that's how accurate it is Twenty nanoseconds is their possible error, but it is a moment that cannot be practically felt If we're talking about the time taken to receive corrections and everything else, then 20 ns is very little There is also some margin for error, both horizontal and vertical, but how is it calculated? So there are different - static, RTK and laser error in millimetres Yes, these are positioning errors - every GNSS equipment, surveying equipment - even the measuring tape has its own error When we take measurements, we always know that we will still be wrong But the difference is how big the error is And it can make a big difference Of course If we look at the technical specification, there is a static measurement which has 2.5 mm + 0.5 ppm - that's the formula for calculating the error
What does it mean - 2.5 + 0.5 ppm - distance from the base station What exactly is 0.5 ppm? 0,5 ppm is the coefficient Suppose your base station is 20 km away, then you multiply 20 by 0.5 And that error comes to 10 mm 10 mm is how much? That's 1 cm So 1 cm + 2,5 mm So 1,25 cm You could say a centimetre and a half is an error Yes, well - rounding it up 1.25 of course it is, but the error is generated in this way Yes, it can be calculated Suppose your base station is further away, for example 50 km, but instead of static measurements as described here with high accuracy, we have RTK surveying - Real Time Kinematic In real time That is, do you measure on the spot? No, there is static on the site - when you put it on and it collects data The static error is 2.5 mm + 0.5 ppm and on...
And then there is, let's say, the horizontal, if we look at RTK measurement If we get corrections and we measure - as all surveyors do today, they walk around in RTK mode and get corrections from the base station via the internet And if we know that the base station is For example, here it is 32 km from our office to the first base station We can calculate what the error would be - then we take the horizontal 8 mm + 1 ppm 32 kilometres Yes, that's 3.2 And then 3 cm in the H plane This is what is written in the technical specification, what we can calculate and then check when we do the surveying Isn't it affected when there might be trees or something in the way that interferes with the signal - is it already calculated when there might be different interferences? You see, GNSS equipment in general has a lot of interferences as such - not only the distance of the base station or the data quality in RTK mode Also, as I mentioned, the troposphere, the ionosphere, solar activity - a lot of interference with these machines and so every time something new comes out, she balances Try to remove as many distractions as possible to enable more accurate measurements Yes, because it's all basically maths and physics - mostly mathematical calculations, of course, time, distance and everything else - that's how GNSS works Next USB Type-C No, we still had the laser And so - AlphaGeo GeoPuls - it has a laser So, this machine can be used as a rangefinder - it has a green laser which is very visible in the field And I saw in practice that it is very easy to see the object and quickly see where the point is And this green laser makes it easier to see, find, point and measure Yes, in principle the measuring speed is also very good Because here he has a power button, of course, but we can also use it as a survey button - you have to hold it down and press it again and then the laser activates and measures The key is that he measures exactly where the laser beam is - at the tip of the laser Rather than giving a coordinate here and then some information - no - he gives the coordinates straight away and your controller can see what you measured with the laser Because the points are already sorted - with a conventional GNSS Pole system or laser And so you can see what was measured - you can distinguish between them And the laser is accurate to 1 cm + 5 mm/m But why doesn't he have horizontal and vertical? Is it because it is 1 ray? Yes, horizontal, vertical is not specified because it is a ray and all other precision is already specified In principle, let's start with the accuracy of the RTK survey and next the accuracy of the IMU - at what angle do we hold the pole So if we hold at 120°, we are able to measure the ridge of the roof And if you just hold it at 30° or 90°, you can measure objects you can't reach Well, let's say the ditch has a slope on the other side - then you can run around in circles and take those measurements But does the battery life affect if you use only the laser for 12 hours - can you do 12 hours with the laser and then 12 hours with the stunt, or does that time decrease? However, time runs out - yes Which one the most? Of course, if we use a laser, because it's extra energy consumption Because he has to reflect and when we tested - we measured the object at 60 metres, but the wall has to be practically white for him to reflect If it is a more matt material, the signal is absorbed and we lose the accuracy and the signal itself Also, I see that Bluetooth and SIM are possible - does that have anything to do with each other, or are they two different things? Well, yes, the technologies are different - of course, the equipment can insert a SIM card and use the corrections from the GNSS equipment itself, but Bluetooth is needed to connect to the controller Of course, we recommend using the standard controller that comes with the S50III Android device, but you can also use any Android device with Bluetooth connectivity But of course you can't work without one or the other - you need both... Not in this case - if you are using an internet connection via the controller, Bluetooth is required, but the SIM card in the GNSS device is not Then you can avoid all that and not use it because it's an extra function, in case you don't have a good signal in the forest, then you can raise the shock higher, put in a SIM card and get a correction signal to the survey Practical, because surveyors only use SIM cards inside This means that using the SIM card has no effect on There is no impact at that point - if there is, there is - if there isn't, there isn't And of course to the question "Does it consume more" - of course it consumes more, because the SIM card module is used - it has to get something from the energy How to understand it - what data do you give out when you're done? What will you see, say, on your computer? I understood the question - it means - after the job we come to the office and what data format do we see You can download .DXF standard Autocad format which can also be used in Microstation, .TXT format, .CSV format, .RW5, your own format
This means that any kind of file you need, you can get Yes, more or less, yes - because all formats are standardised So, the operating temperature is from -20°C to +75°C But in reality, no human would... Yes, actually, -20°C - if you need to go to the site - extreme situation, the builder needs it - okay, you can go But +75°C - Mars - only on Mars This means that in any warm weather - +30 or +35 - you can work And the same goes for storage temperatures from -40°C to +85°C It's almost boiling water At storage temperature you can almost boil it and you will have a working device! Without fanaticism, of course, almost boiling You can even drop the device from a height of 2 metres! Well, I wouldn't recommend it at all, because it's not designed to be thrown 2 metres and that sort of thing Well, of course, but in life you get stuck and then you fall At least you know your device won't break! You can fall on the concrete 2 metres away, but again you have to protect the equipment as well Also weather - can fall into water, which is a very possible situation, dust - especially in field conditions - a pretty big plus for the device - IP67 This means IP67 - your device is fully protected from dust, mud and can be kept in water up to 1m deep for half an hour That means - fall in a ditch until you find it in half an hour - you can hope it will still work And the same for the IMU system - how does she really work - what are the pros of this device with IMU? We've mentioned IMUs several times before, but here is a new type of IMU system - very responsive as it can process tilt data at 400 Hz - 400 measurements per second This is why it is very important when measuring with a laser beam, because your arm is still moving Yes, I was just going to mention that in reality we are human and the hand may tremble in ignorance, but we can press and she will catch that moment of stability A moment of instability, because you're trying to hit a corner or a tree and your arm just moves Now you're where you need to be - if you press the button for a slower system, it can record your previous position, but if it's 400 Hz, it can pick up right when you aim I think that's it! Yes, we have gone through the entire technical specification just for the Alphageo GeoPuls Everyone tries to call it GeoPlus - no problem - we'll understand what you mean! Here's a little miracle that's available to us and, of course, I think it's a very good help in surveying For example, whereas in the past you had to use a rangefinder, measure distances and everything else with GNSS, now you combine devices The two devices are on the same device, which means you can't forget one of them because they're both on the same device! Yes, and what can I say, the machine is working solidly, we have tested it - colleagues have tried it and, indeed, it works and works perfectly Satellites don't fade, stay quite stable, very easy to measure distant objects - you can see the beam Maybe there are some other questions about this equipment that are not clear to you? After what we have just said - I explained a bit more about the GNSS situation as such - is it any clearer now? Of course it was clearer, but I think when you work with it directly, that's the best way to understand how it works And what is it that you don't yet understand about it I would say, well, everyday I hardly will need to know I would say that I certainly won't remember how fast it works in everyday life, or how many hours they worked, but I will definitely feel it, when I don't have to think about carrying a charger or standing for long periods of time, keep my arm straight To measure that one site- I can do it very accurately, briefly, quickly and efficiently For yourself - yes - the surveyor chooses the equipment that is easiest for them to work with And of course, I think it's a very big plus that you don't have to think about how to get to an inaccessible spot, because you can just laser-target it and you've got it! The situation is very simple - nothing complicated - tiny, 300 grams, very easy to carry - you can put it in your pocket and walk around and take measurements You can also download the software on your phone and even work with your phone by logging in What software is used? SurPro, which comes with this machine as no other supports it - but there is laser technology inside If we are clear It is, of course, more clear to me It has become clearer to me! I am really glad that someone will also find the information I have told you today about the machine and more useful in the future and be able to use it properly Thank you for your attention, thank you also to my future colleague from Jelgava Technical College and I want to say goodbye to you Don't forget to visit our website - www.a-geo.info - where you will find information about the equipment and the price Feel free to call, email and comment on the video Thank you for your attention, ata!
2024-02-12 07:02
