How does precision GPS work ( DGNSS , RTK , SBAS , PPP ) ?

Рет қаралды 42,779

Hugues D

Күн бұрын

Пікірлер: 25

@marofe 5 жыл бұрын

the PRN period length is wrong in the video 0:34! 1/1,023Mhz ~ 1us instead of 1ms

@Spectamin 7 жыл бұрын

RTK is best. that is one time investment, and independent. plus better accuracy

@amraboughazala5986 6 жыл бұрын

That video is a very good summary, thanks.

@jannigan3198 3 жыл бұрын

Great job on the clip, thank you

@webvan94 3 жыл бұрын

Nice summary, thanks.

@XinhLe 3 жыл бұрын

Amazing one

@typedef_8463 6 жыл бұрын

The period of the standard GPS should be about 1 us not 1 ms. But good explanation of the current tech

@ibrahimtouman2279 6 жыл бұрын

The GPS-L1 C/A PRN-code repetition-repetition = 1 [ms] exactly

@cliffmathew 4 жыл бұрын

Very good intro. Thanks

@stupidburp 5 жыл бұрын

Could any of these methods theoretically still provide some assistance even if all satellite GPS signal was lost for some time? It seems like multiple ground stations could potentially serve as a backup within a local area.

@HuguesD 5 жыл бұрын

You could use local IMUs to provide some short assistance when no sats are visible. This is how GPS in cars work when you go through a tunnel

@stupidburp 5 жыл бұрын

I was hoping for a little bit better than inertial guidance fall back within the device since the accuracy of that degrades pretty quickly over time. However a stationary GPS signal correction ground station with an internal inertial fall back to correct for rotation of the Earth and historical GPS data to extrapolate from might still be pretty accurate for some time. I am wondering if several of these could broadcast sufficient positioning data using their own locations as a reference for local receiving devices. GPS spoofers can do something like this maliciously but perhaps something similar could be done with good intentions. I hope ground stations can be used as a fall back to send accurate data to create a helpful limited utility GPS brown out instead of a total black out if satellite data is lost. Is anything like this already implemented?

@HuguesD 5 жыл бұрын

Interesting suggestion. I honestly do not know if it has already been implemented but as a principle if someone can think about it, it has already been done or tried.