WHAT IS RTK, PPK & NTRIP? How RTK is DIFFERENT from DGPS?
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- เผยแพร่เมื่อ 30 มิ.ย. 2024
- An easy guide to the secrets of #RTK (Real Time Kinematic). First two closely spaced receivers eliminate atmospheric errors and secondly, Calculating accurate distance between Satellite and Receiver using carrier phase. #NTRIP #PPK
The idea is, if we have two receivers "close to each other", the atmospheric errors for signals they observe are almost identical. As a result they can be excluded from the calculations.
By eliminating these errors a rover receiver can better estimate all ambiguities in its positional calculations. The base receiver transmits its position and observed satellite's data to the rover.
The rover uses this information to exclude atmospheric errors from the calculation and better estimate its position.
Carrier Phase Measurement. In this process we use just the Carrier signal and discard the data in it.
The carrier phase is a more advanced way of determining the distance between the satellite and the GNSS receivers. The radio signals from the satellites are traveling in sinusoidal waves to the receiver on the ground. With the carrier phase measurement we can understand where exactly we are in the phase.
This is done by resolving the number of cycles in which the signal is transmitted and received by the receiver. This can be achieved by using a combination of differential GPS (DGPS) correction data, transmitting GPS signal phase information and ambiguity resolution techniques via statistical tests, in real-time.
The period of the carrier frequency, times the speed of light, gives the wavelength, which is about 0.19 meters for the L1 carrier. With a 1% of wavelength accuracy in detecting the leading edge, this component of pseudorange error might be as low as 2 millimeters. This compares to 3 meters for the C/A code and 0.3 meters for the P code. And all these are happening for all the satellites the receiver receives and in Real Time.
I hardly found such detailed information on RTK on whats happening behind the scene... nicely explained.
Thank you so much sir..much awaited video...
Very aptly covered the topic with excellent visual demo.
Great video man, very well explained and great sketches! ✌🏼
Thank you!! I try to do what I can with my very limited capability.
Very well explained. Thank you. Don’t suppose you have a video on creating a base station using GNSS?
Thanks. No I dont yet have a video on Base station setup. Yet.
Great dada
Thank you!
Thank you sir
Thanks😊
Dear sir,your all videos are excellent and different from others and I think it's for intellectual people, so I request if you make it or translate in hindi more general people get interested and know different types of valuable information just like me.,thank you
These subjects are better in English only as they are universal and not local :)
Hi sir... What to do if 2 UTM zone falls in the same area. If am decided to use one of the zone how the results going to affect the other zone area in mapping.
Hey Samsonraj, UTM is not covered in this particular video.
There are 2 main choices. Either you break the survey area in 2 part as per zones, with some overlap between the parts OR choose only one zone where majority of the survey area falls.
How to find z axis means altitude with help of rtk drone.
Hi I believe all drones have inherent altitude sensor or ground proximity sensor. If you are using RTK, then the drone can record altitude difference between the base station and itself but RTK itself will not tell you how high the drone is from the ground. If you are using the drone for surveying, then using a dedicated altimeter (radar pulse or Sound pulse - not pressure sensor) is recommended. To be Frank I am not an expert in drone technology so you might want to do a more thorough research on this.
Sir please share your mail if
Hi morning. You can get my mail ID in the 'about' tab.