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PPS over USB
Adding PPS to a cheap USB GPS stick | Brendan's Radio Blog
Microsecond accurate NTP with a Raspberry Pi and PPS GPS - Austin's Nerdy Things
GPS to RS-232/USB interface diagram. | Download Scientific Diagram
Using the Sure Electronics GPS evaluation board for NTP
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Frontiers | Time Synchronization for Wireless Sensors Using Low-Cost GPS Module and Arduino
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Raspberry Pi GPS Module USB Port – Kuongshun Electronic Shop
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Adafruit Ultimate GPS GNSS with USB - 99 channel w/10 Hz updates : ID 4279 : $29.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Adding PPS to a cheap USB GPS stick | Brendan's Radio Blog
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Amazon.com: DIYmalls BN-180 GPS Module + CP2102 USB to TTL : Electronics
So you want a Stratum 1 NTP server...
GitHub - ddrown/usb-gps: Stratum 1 NTP setup using USB to transfer GPS PPS info
USB GPS Module – ODROID
Millisecond accurate Chrony NTP with a USB GPS for $12 USD - Austin's Nerdy Things
