Author Topic: Yet Another TruePosition GPSDO  (Read 632 times)

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Online LazyJack

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Yet Another TruePosition GPSDO
« on: February 22, 2021, 11:53:02 am »
As the subject says. I've come up with Yet Another TruePosition GPSDO and I'm sharing the design files and software for it.
It's a TruePosition board, controlled by an STM32 BluePill and sporting a 128x64 LCD display.

I've put the details on my blog: https://diysquared.blogspot.com/2021/02/yatg-yet-another-trueposition-gpsdo.html

Any feedback is welcome.

[attach=1]
 
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Offline ZigmundRat

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Re: Yet Another TruePosition GPSDO
« Reply #1 on: February 22, 2021, 03:01:14 pm »
Thanks for sharing. I have a couple of these as well, and this gives me a few ideas for packaging, etc. Like you, I’ve had these kicking around for a while. They should really be put together in a completed project. You did a nice job with yours.  :-+
 
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Online bingo600

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Re: Yet Another TruePosition GPSDO
« Reply #2 on: February 23, 2021, 02:30:03 pm »
Nice buildup  :-+

I also have a few of these GPS boards.
What happens if power is lost  , are you saving the position and reissuing coordinates ?
Or do you perform a new survey ?

/Bingo
 

Online LazyJack

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Re: Yet Another TruePosition GPSDO
« Reply #3 on: February 23, 2021, 03:49:23 pm »
That is a good question. I actually put the function into the firmware to be able to save and restore the current position, but to me it looks like that if you do a survey, then the TruePosition saves the coordinates itself and will reload it after poweron without any additional effort.
Otherwise it will acquire a fix anyway, even if you do not issue a survey mode. It will eventually lock. Besides, anytime I can issue a new survey.
Still needs to be verified if and how much this affects accuracy.
The firmware keeps track of uptime and last lock time, so in case of power outage this can be detected.
However, you just gave me an idea to show on the status whether a survey was performed since the last poweron, as that would definiteley indicate if we are using the most accurate location.
 


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