Adding a GPS Rocket Tracker to my openSource altimeters (for Android devices)

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bdureau

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Few years ago I started logging GPS coordinates as part of the rocket flight on my stm32 Altimeter. I am now also adding GPS tracking and I am releasing it open Source
I have been looking at the previous tracker that were written by various people and unfortunately they are no longer compatible so I am re-writing from scratch. I have re-used the rocket track icon (from Kevin) because it looks cool but this is work in progress and I have not implemented all functionalities yet. This is work in progress!!!
Screenshot_20220102-151849.png


Code for the front end is

backend
 

billdz

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Thanks much for developing this, much needed.
 

thzero

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Nice. I have too been rewriting from scratch. But I chose to try it with flutter (for eventual use on iOS).. but my lord, that been painful
 

bdureau

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This is what the tracker looks like.
P_20220205_150659.jpg
I am testing different GPS modules to see which one is best and to find a compromise between price and reliability. So far I have bought 4 x 6M GPS modules and one was unable to acquire satellites. I have bought a couple of 7M modules and they seam to start acquiring GPS a lot faster. I gave a couple of trackers to some rocketers in my club so that they we can start flying them
 

OverTheTop

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Don't expect as much from the smaller GPS modules as they are not as sensitive as the larger ones, from what I have found. Also if you keep your telemetry transmitter further away from the GPS antenna it will lock quicker and give better position reporting. Interference from the telemetry Tx can induce receiver desensitisation and clock jitter.

BTW, GPS refers to the American Navstar system in particular. A better term to use these days is GNSS, Global Navigation Satellite System. This includes Navstar, Galileo, Beidou, GLONASS and other systems. Many of the GNSS receivers can receive more than one constellation, providing greater accuracy due to working on different frequencies and tracking more satellites.
 

bdureau

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Don't expect as much from the smaller GPS modules as they are not as sensitive as the larger ones, from what I have found. Also if you keep your telemetry transmitter further away from the GPS antenna it will lock quicker and give better position reporting. Interference from the telemetry Tx can induce receiver desensitisation and clock jitter.
yes after testing it is less sensitive than those with larger antennas.
For the telemetry I am using various modules to see which one is best and which one less disturb the GNSS
The objective is to have something affordable ( less than 50 euros)
 
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