GPS Disciplined Numerically Controlled Oscillator Based on Xilinx FPGA
Dimiter Hristov Badarov, Georgy Slavchev Mihov · 2022
The high precision frequency standard is important in most frequency and time measurements. Accurate frequency standards are expensive and hard to obtain. Most of the GPS receivers provide 1 pulse per second time standard which can be used to accurately discipline a crystal oscillator with a high short-term stability. The following work uses a high frequency unadjustable crystal oscillator followed by a numerically controlled oscillator in order to obtain a high stability frequency based on 1 pulse per second GPS signal.