Using LORAN-C Broadcasts for Automated Frequency Calibrations

摘要

The LORAN-C (LOng RAnge Navigation) system is a radio navigation system maintained by the United States Coast Guard. LORAN-C signals are widely used as a navigation aid. Since the signals are extremely stable, they can also serve as an excellent reference for frequency calibrations. Any quartz, rubidium, or cesium oscillator can be calibrated with LORAN-C. This paper tells how to use LORAN-C signals for frequency calibrations. It describes the LORAN-C system, lists the equipment that you need, shows the data you can obtain, and discusses the accuracy you can expect. It also discusses the NIST Frequency Measurement System, an automated calibration system that uses LORAN-C signals.