My ADSB Receiver Box – GPS Precision Time – Upgrade 1

Here is a first upgrade for my ADSB receiver box – GPS precision time. The MLAT position calculation for aircrafts depends on a precise time. While there is already a time synchronization between MLAT receivers in a specific area it is also possible to add a precise time source to improve the calculation result. A GPS receiver is such source when equipped with a PPS (pulse per second) output. The PPS is a signal with a width of less than one second and a sharply rising or abruptly falling edge that accurately repeats once per second with low jitter. The GPS time and PPS signal  are then used to sync the internal ntp time service and keep a low offset and jitter.

Adafruit GPS Breakout v3 connected to Raspberry Pi

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mictronics piDrive

Well, I’m very happy with the piDrive I got as pledge from the Kickstarter campaign. Work nice and smooth on a 24/7 base in my personal webserver. But while building some other stuff with Raspberries I had a demand for some more piDrives. Unfortunately the maker of the Kickstarter campaign no longer response, there webpage has not seen any updates for month, almost a year, and there shop shows the piDrive anytime out of stock.

So I fired up my layout tool and put together my own piDrive design, similar to the original one, also based on PL-2571B.

mictronics piDrive

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