GPS to RS-232/USB interface diagram. | Download Scientific Diagram
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Gps Module Micro Usb Neo-6m Neo-7m Neo-8m Satellite Positioning 51 Single-chip For Arduino Stm32 Routines - Integrated Circuits - AliExpress
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USRP Open SDR B210 Metal Shell 705X Material, ΠGPS 10MHz USB PPS DC 6-12V | eBay
An NTP Stratum-1 clock usng a GPS 18 LVC and FreeBSD
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Building a Raspberry-Pi Stratum-1 NTP Server
USB GPS with PPS and pretty cheap too - Server operators - NTP Pool Project
An NTP Stratum-1 clock usng a GPS 18 LVC and FreeBSD
Time Server
So you want a Stratum 1 NTP server...
Usb Gps Glonass Receiver Dual Gnss Receiver Module Antenna, New Usb Protocol 0183nmea Replace Bu353, - Gps Receiver & Antenna - AliExpress
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USB GPS Module – ODROID
U blox RS232 TTL can take pps pulse Beidou GPS module for timing/timing/positioning/speed measurement|ABS Sensor| - AliExpress
So you want a Stratum 1 NTP server...
