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[aprssig] Fw: ADS-B to APRS Server

Andrew Rich vk4tec at people.net.au
Sat Apr 26 07:55:44 UTC 2008


1. Yes the device is pricey, but for what it does it is very cheap.
2. Data rate is around 1 Mb/s
3. Modulation type is pulse position modulation.
4. Freq = 1090 MHz

You need to be able to program an FPGA and a 40 MHz A/D.

I can't see Brisbane Airport from here.

I loose it at about 150 ft.

I have just started some more smarts. which shows the coverage map.

Add this into google earth

http://vk4tec.no-ip.org/cgi-bin/adsb_coverage.cgi

As a network link.

It works out the bearing and range of a plane, and updates a table with lat 
and long if it gets a target further away.




----- Original Message ----- 
From: "Ray Wells" <vk2tv at exemail.com.au>
To: "TAPR APRS Mailing List" <aprssig at lists.tapr.org>
Sent: Saturday, April 26, 2008 5:48 PM
Subject: Re: [aprssig] Fw: ADS-B to APRS Server


> Andrew,
>
> Just back home.
>
> That rx is a bit pricey and I don't have any wealthy relatives, healthy or 
> about to croak!
>
> Do you know anything about the data transmission - data rate, modulation 
> type etc? I guess what I'm getting at here is, is the rx technology beyond 
> homebrew? A reasonably priced rx might be the road to some sort of network 
> for increased coverage.
>
> Somebody else mentioned tracking a plane going into Brisbane and losing it 
> at 150ft. I observed the same thing. Is that the height of Brisbane 
> airport, or do you lose the radio path when they get to that altitude?
>
> Ray vk2tv
>
> Andrew Rich wrote:
>
>> Ray,
>>
>> My Receiver at home
>>
>> http://www.tech-software.net/adsb_rx3.jpg
>>
>> My Antenna outside
>>
>> http://www.tech-software.net/adsb_ant3.jpg
>>
>> The data is coming from my antenna.
>>
>> I have the video piped out to a CRO, and am trying an ASUS eeepc as a 
>> test.
>>
>> I can also take feeds from other sites, and make the feed availble in any 
>> format.
>>
>> What would be good is a network of receivers.
>>
>> The receivers cost $890 from melbourne.
>>
>> It has a program that outputs data on port 30003
>>
>> You have to have a windows box to talk to the ADSB box.
>>
>> That is what I am using on my linux box, taking the data from the windows 
>> program.
>>
>> Got a couple of things happening here,
>>
>> APRS feed
>> Data into MySQL for google earth feeds
>> Stats are made from MySQL tables of the collected data.
>>
>> Cheers
>>
>>
>>
>> ----- Original Message ----- From: "Ray Wells" <vk2tv at exemail.com.au>
>> To: "TAPR APRS Mailing List" <aprssig at lists.tapr.org>
>> Sent: Saturday, April 26, 2008 10:41 AM
>> Subject: Re: [aprssig] Fw: ADS-B to APRS Server
>>
>>
>>> Andrew,
>>>
>>> All very interesting.
>>>
>>> Do you have an ADS-B receiver at your place or are you taking a feed 
>>> from somewhere? Is there any technical data available, now that you've 
>>> piqued my interest? I'd like to diplay traffic passing through the 
>>> Kempsey area.
>>>
>>> It's interesting to see the southern extent of coverage. For the coastal 
>>> route it is just north of Grafton, or about 150 miles from Brisbane. For 
>>> the inland route south, the cut-off is approximately east of Stanthorpe, 
>>> about 80 miles from Brisbane.
>>>
>>> Ray vk2tv
>>>
>>>
>>> Andrew Rich wrote:
>>>
>>>>  ----- Original Message -----
>>>> *From:* Andrew Rich <mailto:vk4tec at people.net.au>
>>>> *To:* Australian APRS Users <mailto:ozaprs at aprs.net.au>
>>>> *Sent:* Saturday, April 26, 2008 8:23 AM
>>>> *Subject:* ADS-B to APRS Server
>>>>
>>>> Gudday
>>>>  I have written an ADS-B to APRS server.
>>>>  ADS-B is tracking for aircraft.
>>>>  It runs on LINUX, and uses perl
>>>>  A socker server listens for connections on port 10151, then 
>>>> establishes a connection to the ADS-B stream.
>>>>  Packets are then formed into something that APRS can understand.
>>>>  You can try it, you should see planes flying around Brisbane.
>>>>  Simply add "vk4tec.no-ip.org" as an aprs server, and the port is 
>>>> "10151"
>>>>  No need to login, actually it just ignores anything sent
>>>>  Please have a go and let me know if you get it to work for you.
>>>>  Cheers
>>>>  Andrew Rich
>>>> VK4TEC
>>>>
>>>> ------------------------------------------------------------------------
>>>>
>>>>
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>>>
>>>
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>>
>>
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