certain planes not showing on vrs

Want to post something that doesn't quite fit into the other forums? This is the place for that.
Post Reply
ivan
Posts: 1
Joined: Tue Aug 28, 2018 3:02 pm

certain planes not showing on vrs

Post by ivan » Wed Aug 29, 2018 8:35 pm

hi all
i am not really a pc buff but can do basic things. ok so let me try to explain my problem, i have been tracking planes on the web via the ads-b exchange,virtual radar24 ect.
so next step was to purchase dongle and set up vrs, all is well seems to work fine tracking upto 180 planes . however my location is midway between marham, lakenheath,and mildenhall. i track planes and helicopters on ads-b exchange but do not see them on my vrs. i tracked a hurricane the other day it flew straight over my house, again it showed up on the internet vrs, and flight24 but i could not see it.
any help would be appreciated.

Radio Active
Posts: 34
Joined: Wed Mar 30, 2016 7:14 am
Contact:

Re: certain planes not showing on vrs

Post by Radio Active » Thu Aug 30, 2018 4:05 am

Not all aircraft use full ADS-B which transmit their location, Some of these aircraft you cannot see are most likely using Mode S transponders or other types of transponders (depending on the aircraft) and are tracked using MLAT (multilateration) a method of tracking aircraft via a number of ground receiver stations (that would be picking up that aircraft) using a MLAT client software and data sent to a MLAT server where all the data is put together and returned for display, Not all aircraft can be tracked.

skaw
Posts: 23
Joined: Sun Jun 05, 2016 9:57 am

Re: certain planes not showing on vrs

Post by skaw » Thu Aug 30, 2018 7:45 am

Easiest step would be to use your setup to feed data to flightaware. By doing so you will get the results from MLAT calculations back to yourself. You can then set up a second receiver inside VRS using that datastream to display these results.

wn0nfi
Posts: 3
Joined: Thu Aug 30, 2018 5:12 pm
Contact:

Re: certain planes not showing on vrs

Post by wn0nfi » Thu Aug 30, 2018 6:22 pm

Some times I will get a plane that will give me latitude & longitude but the plane will not show up on the map. Do I not have something not set right?

kiwikieran
Posts: 67
Joined: Sat Jan 20, 2018 8:50 pm

Re: certain planes not showing on vrs

Post by kiwikieran » Sat Sep 01, 2018 7:57 pm

Does that plane show on the side panel? Where are you seeing it has lat/lng?

wn0nfi
Posts: 3
Joined: Thu Aug 30, 2018 5:12 pm
Contact:

Re: certain planes not showing on vrs

Post by wn0nfi » Sat Sep 01, 2018 10:46 pm

kiwikieran wrote:
Sat Sep 01, 2018 7:57 pm
Does that plane show on the side panel? Where are you seeing it has lat/lng?
Image

agw
Posts: 2239
Joined: Fri Feb 17, 2012 3:20 am

Re: certain planes not showing on vrs

Post by agw » Mon Sep 17, 2018 11:00 pm

Sorry for the late reply.
wn0nfi wrote:
Thu Aug 30, 2018 6:22 pm
Some times I will get a plane that will give me latitude & longitude but the plane will not show up on the map. Do I not have something not set right?
If the aircraft position is stale then it won't be plotted. A stale position is one that has not changed for at least 60 seconds + the display timeout in seconds. If the aircraft is on the very fringes of reception then you might not get a valid position come through for a while but you could still be getting Mode-S messages coming through. The non-position updates keep the aircraft in the list but without a recent-ish position it won't appear on the map. You can add the position age as an item to the aircraft detail display.

If you're only getting two aircraft in the aircraft list then I suspect it's either very late at night, or your antenna might not be suitable for picking up Mode-S or you might have the antenna in a suboptimal location. If you can get hold of a Mode-S antenna (they're fairly cheap) and stick it outside or high up near a window with a good view of the sky then you should be able to pick up more aircraft and not see so many stale positions.

wn0nfi
Posts: 3
Joined: Thu Aug 30, 2018 5:12 pm
Contact:

Re: certain planes not showing on vrs

Post by wn0nfi » Thu Sep 20, 2018 2:54 pm

Thank you for the info. I did get a better 1090 antenna that did help some. I see about 10 planes with the new antenna. I do live about 120 nautical miles from a major airport.

Post Reply