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I developed chasemapper for this exact purpose a *long* time ago now: https://github.com/projecthorus/chasemapper
This is what we use in our chase cars, and it lets us very reliably be at the landing site of our flights, ready to watch the payloads land.
This is a server application which shows your chase car and balloon position, and runs predictions live throughout the flight. The interface is visible on a web browser, which could be run on a laptop or a tablet. Multiple clients can connect if required.
It can either use the online 'Tawhiri' prediction API (which requires internet access), or it can be configured to download the relevant section of the GFS wind model, for use offline.
I run this on a raspberry pi in the back of my car, which is also running telemetry reception software (horusdemodlib, for my 4FSK modulation).
I believe Mike Hojnowski has some code to relay in APRS balloon traffic.
On Sun, Jun 19, 2022 at 4:14 AM Steve G8KHW / AJ4XE <steve@...
Joe, the HABhub tracker does this - it takes the transmitted data
(position and altitude) from the balloon and corrects the
predicted trajectory based on where the balloon currently is, how
fast its ascending/descending etc.
I addition the Raspberry Pi Pi-In-the-sky (PITS) software can
(if configured) do onboard calculations based on ascent and
descent rates to calculate a landing spot. That predicted landing
spot is transmitted along with other data. The Pi calculated
landing spot can be overlaid on the HABhub tracker (in addition to
the trackers own prediction of landing spot) and can also be taken
directly by the chase vehicles.
Here are a couple of videos of the HABhub tracker predicting the
landing spot during real flights:
keep you eye on the blue line and dot (HABhub prediction) and the
red X that of PITS
The red red line and dot is the HABhub prediction -
the red X that of PITS
On 18/06/2022 18:45, Joe WB9SBD wrote:
I remember many many years
One of the Flight prediction pages, was making a semi ummm
Or it was I don't know. but see this was what it was gonna
You made a prediction giving the page,
Rate of climb,
Rate of decent.
And it would tell you where it should land.
Now someone was working on a system, where you did this
and it would make the prediction of landing site as well as
path of the flight of course.
But then when you released your balloon, you could input this
new live sonde data, ALL BY ITSELF AUTOMATICALLY,
where it now is taking in the new rate of climb, speed of
movement (wind speed)
etc. all this "LIVE" data, and it would automatically on it's
own constantly up-date the new predicted landing site.
Did this ever become a reality?
NEAR SPACE SCIENCES KB9KHO