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HMD Datalink contacts drifting


fylzz
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The circle around contacts on the HMD is quickly drifting away from the real location of the object. When the object exits and then enters the viewport  of the HMD again the position is correct again and then drifts away quickly again. HMD alignment has been properly done on the ground. I have a track but it is 10MB (only like 10 minutes of gameplay with cold start). How can I transmit this file to you ?

 

I suspect same behaviour with ground diamond but have no track for this.

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Hi

 

if it is something you can reproduce in a short mission from airstart that would be the best option. 

 

thanks

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Thank you, 

 

I will take a look in the morning. 

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I thought I heard or read a comment somewhere that this behaviour was to be expected due to the slight delay in data link information and gps updates. I'm not 100% sure though.

Cheers!



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Yes there is about a 12 second delay in the information,

 

I have asked the team to take a quick look, but my feeling is this is correct as is. 

 

thank you

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On 9/7/2021 at 5:54 PM, fylzz said:

The circle around contacts on the HMD is quickly drifting away from the real location of the object. When the object exits and then enters the viewport  of the HMD again the position is correct again and then drifts away quickly again. HMD alignment has been properly done on the ground. I have a track but it is 10MB (only like 10 minutes of gameplay with cold start). How can I transmit this file to you ?

 

I suspect same behaviour with ground diamond but have no track for this.

try a re-alignment sometimes that stops the drifting for me, so realign HMCS after turning on DL

 

zprwsp-6.png

 

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On 9/15/2021 at 3:46 PM, Convexrook said:

try a re-alignment sometimes that stops the drifting for me, so realign HMCS after turning on DL

Maybe as a workaround but I still think this is a bug because it's also doing it right after airstart.

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  • 1 month later...
On 11/16/2021 at 10:58 AM, RoxSy said:

Strange ... sometimes it does, sometimes it doesn't.

I always do the same cold start procedure so I align pretty much everytime at the same moment.

Could it be related to the position of the donor ?

or the Server maybe? 

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  • 2 months later...

Some irregular drift in datalink is to be expected, As Big Newy stated, a datalink contact can be up to 12 seconds old. How long depends on many things and will vary constantly.

Your own display shouldn't extrapolate a PPLI as this will potentially add further error to the position. Remember the PPLI is simply a position sourced from another aircraft, and has already been subject to track filters/extrapolation etc.

Think of datalink as a type of LAN. The protocols/language differ but the concept is the same. Instead of Cat5/6 cable or wifi it is linked over crypto radio.

So,

1. Aircraft A (AWACS/wingman etc) detects a track, the track is subject to interpolation to account for RADAR update rate. (e.g. time for AWACS RADAR to complete a 360degree sweep, wingman may have a wide 6 bar sweep etc....)

2.The information is encrypted. Anyone who has ever used crypto radio voice will know there is noticeable delay in transmission.

So the data may be 1-2 seconds old before it even leaves the donor.

3. The data is broadcast over the network. This is a biggie. Unlike your home LAN, the network is subject to atmospherics, antennae shielding, changes in range... the list goes on. Try maintaining a wifi network between 10 cars on the highway and you will get the idea..... Now make those cars maneuver abruptly in 3d and fill the electromagnetic spectrum with multipe RADAR, UHF, VHF, ECM etc etc...

4. The data is received, decrypted and displayed in aircraft B (you).

5. Like all networks this data is constantly being refreshed, updated and transmitted to/from all participants...

 

with so many variables is impressive that the delay is only up to 12 seconds.

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On 9/15/2021 at 6:19 AM, BIGNEWY said:

Yes there is about a 12 second delay in the information,

 

I have asked the team to take a quick look, but my feeling is this is correct as is. 

 

thank you

The 12 seconds is the *maximum* delay in the system. Think about data sourced from AWACS. F/F link as a 3x faster refresh rate, and I would think the PPLI data would be for accurate the closer you get. Having a 12 second delay for all information is wrong.

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4 hours ago, Hulkbust44 said:

The 12 seconds is the *maximum* delay in the system. Think about data sourced from AWACS. F/F link as a 3x faster refresh rate, and I would think the PPLI data would be for accurate the closer you get. Having a 12 second delay for all information is wrong.

Thank you for your opinion, I will pass it to the team.

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