Theory of DGPS! Principal & Methodology | Every SURVEORs Should Know This!
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- Опубліковано 20 лют 2021
- Theory of DGPS.
Now DGPS is broadly used in modern surveying techniques!
Hi everyone! Hope you all are good.
Today we are here with a new video that may help you to develop your surveying skills.
Every instrument has its own theory on the basis of that it gives us the output. Similarly DGPS also follow a theory! Today we will describe the THEORY OF DGPS i.e. How DGPS gives us accurate position data of a particular point and why DGPS is better than normal GPS.
Before going to discuss about the DGPS we must know about GPS because we are talking about D-GPS i.e. Differential Global Positioning System.
GPS a satellite based navigation system owned by US government and operated by the US space force which gives position data of a point.
Accuracy of GPS is 500 - 30 centimeter.
In GPS, total satellite is 33, among those 24 are functional and 31 are in 6 Orbit.
Like GPS, some countries have their own positioning system. Like-
1) GLONASS owned by Russian Government.
2) GALILEO owned by Europe government.
3) Compass (also known as Beido) owned by Chinese Government.
4) IRNSS owned by Indian government.
DGPS are working on a very important factor which is called GNSS i.e. Global Navigational Satellite System. That provides Geo location and time information to DGPS receiver.
GNSS is formed by GPS + any one of above four positioning system for better accuracy.
So by using GPS we can get position of any point on earth. So the question is Why DGPS? What is the Principle of DGPS?
And I will give the answer of this “WHY”
WATCH THE FULL VIDEO TO KNOW THE DIFFERENCE BETWEEN GPS AND DGPS AND WHY DO WE NEED DGPS.
In DGPS positional corrections to GPS data applied by way of BASE and ROVER system.
DGPS uses a known position to adjust real-time the GPS signal to get more accurate data.
In DGPS we use two identical GPS and both have the same identical components.
Like tripod stand, antenna, receiver, Controller etc.
Among them one is used as BASE and another is called ROVER.
Now I will discuss about the type of DGPS survey.
There are two types of DGPS survey that is static and kinematics.
Kinematics survey is further subdivided by two types one is called PPK post process kinematics and another is called RTK real time kinematics.
Static DGPS survey.
In static survey we use the DGPS for finding coordinate of an unknown point or establishing the control point for road or topographical survey. Usually we take data for 72 hours to get accurate position of an unknown point. We can take data for short period also but observations of 72 hours gives us most accurate result.
Now I am going to discuss about kinematic survey.
As I told before kinematics survey have two parts that is post process kinematics and real time kinematics.
In kinematics survey the concept of Base and Rover is applied. In post process survey, there is only satellite connection between both the identical DGPS and we get the data after processing in software.
But in real time kinematics survey, both the identical DGPS are connected by satellite and internet connection or by radio frequency. By using RTK we get data in real time during field survey, there is no need to process the raw data further like in PPK survey.
In normal GPS we take data of an unknown point with an accuracy of 5 to 10m.
But the DGPS Rover get corrected by the DGPS base we get data of a point with greater accuracy this is why DGPS is better than GPS.
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Hello viewers,
Sorry for the background music.
Otherwise if this video is helpful drop a LIKE.
Thanks & Regards.
Please can you tell me your email address I have some questions
Please remove background music
____________ is a unique surveying technique that was used to link several ground stations concurrently.
Can most correct answer be DGPS??
No problem sir ❤
Today, I learned many concepts through you.... thank you so much Sir
You are most welcome. Please share our video, will be glad ☺️☺️
Very interesting..
Your analytical lecture will be instantly acceptable for beginners
Thank u so much
very nice explanation of the DGPS.. wonderful job done. i appreciate it
My pleasure
Perfect and concise explanation. Keep up the good work 👍
Thank you so much. Keep exploring
excellent one
Thank for sharing knowledge.. sir
You are welcome. Share our video
Very well explained..
Very nicely explained. Thank you
Thank You for your valuable feedback 😊
Thank you so much for the vdo.
It helped me a lot.
We are glad to hear that. Thanks
can i use office pathfinder for data processing
Thanks a lot sir
Mujy kisi ki itni achi samj ni ai jitna apki video ny concept clear kiya long live ❤
Love to hear that
wonderfully explained👌👌
Thank You for your valuable feedback 😊
Sir Site mai totalstation se NGL Data lene k badh usko 10/10 meter grid kaise banayenge AutoCAD mai with contour line k sath please ek video banadijiye Then it will be very useful for me..
Ok I will try to make a video, thanks for the suggestion.
Vedio is very nice and want to know what is difference betn CORS and DGPS plz share it.
Awesome video bhai
Next video on LIDAR
Nicely explained n informative
Thank You for your valuable feedback 😊
Very Well Explained. Keep it up.
Thank you, I will
Very good explaination
Thanks for creating this usefull video.
Welcome
I have worked on Trimble R6 DGPS on RTK method in continuos topo mode but there was no any option for logging interval. Is that automatic set or somethings else ?
There should be a logging interval. You may find this option while setting base or rover radio frequency settings
Could you clarifie"While taking DGPS in Kinetic mode for three hours, what happens if the bubble just moves away from the center but remains within the block circle?"
Weldon bro for making amazing video on dgps
Thank you please share our video with your fiends.
very nice explanation
Worth reading
Good Job
Good teaching thanking u
You are welcome. And thanks.
Kia latest DGPS MN bhi instruments ak sy zyada readings lty hn or on ki accuracy kitni hoti ho
Kia latest DGPS ak hi time py 1 mm ya 0mm accuracy MN reading daty hn ya ni
Very well explained
Thank you
Dear Sir,
I would like to ask you please explain for National Highways constructon I want to establish at every 5 km a pair points for 50km. What is the procedure means how to do the Survey with DGPS STATIC Mode.
Watch our practical videos on DGPS which may help you.
Superb
Thank you
What is the limitations of using RTK in forest cover area survey. Can it be used? Pls reply
In forest area radio based dgps should be used
One question.\! Is there any place where we can enter the coordinates of the known point in the base GPS? Because with my limited understanding, i see that without feeding the ground control point to the base GPS, it has no reference!!
Yes. In DGPS while base setup there is always a option to input known coordinate
Thanks good explained
Glad you liked it
very informative ...
Thanks for watching
Grt 👍
Very nicely explained
Thank you so much 🙂
Dear Sir,
I am currently using Sokkia GRX3 DGPS and i want to know more about this instrument plz help
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Super 👌
Very good
Thanks
please make a detailed video about GPS types
Ok... Thanks for your valuable suggestion😇
Good knowledge
Thanks
Well explained
Thanks
Ap log bht hi Shandar kaam kar Rahe h sir
Thank you so much. 🙏
@@LearnExplore keep it up sir I am eager to watch more videos on Dgps, Lidar & Drone 😃🤗
Sir, video is good and explainatory. However i would request you to avoid any music in background of educational videos 👍
Thank you for your feedback. Actually to make it professional I did it. Will keep in mind next time. Thanks
Dear how to make grading plan from profile in excel sheet
Kya dgps se internet k liye use ho sakta h
what is the level of accuracy in taking levels when compared with total stations??
For taking levels total station is more accurate. Dgps is best for control points
Please give me a detailed video on best and cheap Dgps in india
Great video
Thank you
what is the maximum distance between rover and base for using RTK
Sir,
I have to upload a DGps map of the forest area in pdf format on parivaish portal assigned for processing of forest diversion cases. can you guide me in this regard at an earliest??
Contact us via email
Excellent
Thank you
Good sir
How dgps use in high-rise building construction .If it not accurate in 1mm.
Can we trust dgps for setting out high rise building
For accuracy ETS is better
Zabardast
Dear Sir, kindly before presenting video to all over world, could you prepared PowerPoint slides of your valued home work manual presentation, it will gives more help to end users to words understand, and also if music will eliminate.
Regards,
Saleem
We will take it seriously and try to implement in next videos. Thanks for your valuable feedback. Stay tuned.
One of my questions is that when the base is set to a known point then why would it take other data instead of known data,cuz base still on known point. Base can't instruct Rover on what to do?
By doing this, Base calculates the difference in a particular time frame between other data set and known data. And then it apply the correction to ROVER
Sir Static survey ke liye base ka Easting, Northing pahle se malum hona jaroor hai cya?
Yes
Thank u sir
Welcome
Nice video, now i ll say that basically RTK survey is the subset of DGPS survey. I was thinking that both are totally different
Thank you
Please watch our practical video on DGPS. Both Static and RTK
Nice video.
Sir will you please help me to purchase DGPS?
What points should I keep in mind while purchasing DGPS?
Are Chines brands like South, E survey, Comnav reliable?
Leica is very best on this. I used Trimble, Leica, ChcNav. I found leica is very good. I use Leica GS 18 model
@@LearnExplore thanks
what points should I kept in mind while purchasing DGPS
That depends on your utilization or work. I would prefer RTK Radio enabled DGPS
@@LearnExplore leica gs18 ka full option leke video dijiye
How range to base and roover distance cantect ppk kanamite
Sir can you make a tutorial on how to set up rtk?
Yes we have a video on rtk
Nonpotion survey kartey hai hum (RTK) kuch bataye hum stument ke base ko kahi bhi laga dete hai jiska hume NEZ nhi pata hota
Aysa survey karna galat he.
Relatiive points to sahi ayega. Area v sahi ayega. Leking original coordinates se survey data shift rahega thoda
hi, video was very explanatory and in detail.
I have a question.
you said that bearing and distance would be varied by time for base and consequently for rover. does it mean everyday i will start the survey and will find point ‘B’ at different location (as a result of change of bearing and distance from one point to other).if it is so then how will achieve accuracy in ‘mm’?
I am talking about the RTK.
Waiting for reply.
Hi,
Firstly it was a nice question.
I had also the same doubt and to check this I have tested it by talking two observation on a same point at alternative day. And I found a very small variation, however the variation was little big in respect of mm as I established Base point with a observation of 5 hr only. In normal min 24 hrs base observation is required before starting survey work.
You will find different bearing between morning and afternoon too. Normally it's not a big difference to worry about.
Thank you sir, Best vedeo... but i don't know hindi,
please explain in telugu language.
Telugu vedeo s
where can i find the practical video of the DGPS?
Please search dgps practical
bravo
Thanks
Sir ye point nikalkar Kaya karte hai iska udesh kya hai Jamin napi karne me dgps ka use kya hai
Dgps have been widely used in many engineering works including land survey
I want to learn.
Am very suppor this I would like to discuss more about
You can ask me
Bhai Bahut kam ka video hai bahut Achha laga ye video
thank u
Level me ache se acha DGPS ka accuracy kya hai?
Hi,
I am a Merchant Navigator on Cargo Ships.
Just want to Know - how the GPS Recievers get DGPS information from a DGPS Station.?
As I have understood that DGPS Stations use MF to Trasmitt the corrections and other info.
Does that mean Marine GPS Systems that are "Differential Ready" have a MF Receiver in built in them?
ANYONE Who knows, please clarify.!
Sir if a point base point not accurate it's changed or misplaced can it give accurate reading on B point
No.
Error in A point means B point will also get affected.
@@LearnExplore exp: I do measures my land but here not stone near me in my eyes so DGPS worker reder or government officer take 3 km stone which I can,t see even in life how can take accurate reading from that stone which I don't know accurate or not
Sir reply
The variation will cause lateral shift a little but, area of land will be same. Because every 4 points of your plot will have same lateral shift.
@@LearnExplore plots variation come shift if accurate variation come don't shift places so what can do ?
How to open t2 file in Excel or word format
You can't open it until processed the same through TBC software
Sir can you tell us how to check DGPS exported report
Regards
Ajay
The main output is coordinates from a dgps
And there are lot of other data can be exported which contains time, satellites used, signal of satellite, base report, number of satellite etc.
During import of data you can see how much time consumed for the survey
kisi plot ka survey karte samay oos plot ke government office ke nakasha ke alawa jagah par koi bhi land parcell athva boundry athva koi bhi known point pata na ho tab accurate land survey kaise kare?
Without reference it is difficult to do. Use reference from other plot or road
Sir DGPS ka course jharkhand me hota h kya , ?
GSM dgps survey ka method video banaye
Sir Setlab ka DGPS kaisa hai kya ye DGPS purchase karna chahiye please bataye
Ha ye bhi thik he. Mene use kiya tha ekbar.
@@LearnExplore sir kya Setlab china ka hai ya sweden ka
Sorry I forgot that. But China ka nahi he sayad
What we can say to DGPS instructor to take correct base point if base not correct and same wrong things in rover
If you are sure that base point moved. Then tell him to re-chek accuracy of the base point from other base point if available nearby.
@@LearnExplore which method use to calculate accurate base point and spaces of plots
Either you have take observation on base setup 72 hours.
Or you can derive base point from nearby Survey of India GCPs. GCP means ground control point.
@@LearnExplore how find india gps point ?
@@LearnExplore 72 hour setup in how much time taken 3 days or other times?
Please share excel sheets related to survey
Kanha koi bhi benchmark nahi hai us jagah Static se 72 hours observation me Rakh ke East , North mil jayega?
Yes mil jayega
Sir dgps se level sheet kaise banate h
Konsa level sheet banana chahte h
sir ek land farmer servy pe video bna do jis se kuch sikhne ko milga
See j have told many utuber ,dont use background music sound because if u are providing information a good listner listen to u .
Ok next time
Wonderful explanation but plz avoid background music...it disturbs our concentration
I'm extremely sorry for that. I will keep this in mind in our next video. Thanks for the feedback
Mobile se UTM Bana sakte hai station points New Kam hu sakta hai
Hmm ho sakta he
Hello
Agar known point na ho tab kaise maloom kar sakte DGPS se jaise TS me hum log ENZ apni taraf se 1000,2000,100 le k kaam start kar sakte hain waise hii DGPS me kaise kare kiyo ki 72hrs tak to kaam observe nai kar sakte hain kaam shuro karne ke liye please thuda ye samjhaden
Thank you
Kaam shuru kar dijiye. Lekin base data ko RtPpx server se process kar dijiye
Tbc software me kar sakte he agar aapbke paas trimble equipment ho
Or else CORS use kijiye
Thank you sooo much
Mai bilkul bhi nai socha tha ki 2 saal purane video k bhi comments ka reply karenge aap
But thanks once again
Average set 1hiure or 4000,sec. Time set
HEY your app not working
Sir, I have completed my diploma( civil) and I am studying in B-tech civi second year. I can't understand DGPS and it's principles properly.
Watch our videos. Theory and practical videos
You will get basic idea
@@LearnExplore Yes sir. I found it.
@@LearnExplore Your pactical videoes are superb. 👍👍
Good luck.
Thank you.
Don't miss the DGPS theory video.
Do share our videos 😊
Sir, it would be very worthy if the medium is in English... We can't understand the language.
We will soon update english subtitle
@@LearnExplore Thank You Sir.
We have updated the subtitle please check it out. Thank you for your patience.
2
hi
Pls..remove the background music
Next time for sure