A precision ranging system, utilizing a phase-locked loop (PLL), has been developed for use in high-accuracy short-range navigation and tracking. Initial studies and laboratory experimentation indicate that an accuracy of 0.1 m is within feasibility limits. The system utilizes a PLL to maintain a constant phase relationship between the modulation of the carrier frequency of a master station and the return signal from a fixed position repeater station. The fixed phase relation implies that as range varies, the modulation frequency varies inversely. Range measurement is determined by means of frequency measurement.
ASJC Scopus subject areas
- Ocean Engineering
- Mechanical Engineering
- Electrical and Electronic Engineering