Method and apparatus for digital detection of electronic markers using frequency adaptation

摘要: An electronic marker locator with a digital architecture for providing accurate and consistent estimation of the signal strength is presented. The includes Digital Phase-Locked Loop (DPLL) structure. transmits known adjustable frequency bursts corresponding to markers be located while synchronously capturing signals returned from markers. Because convergence properties DPLL, very measurements reflected field are possible, resulting in both an improvement maximum detection depth accuracy. Further, analog front-end hardware can reduced, offering wider resistance component tolerances, lower calibration test times, flexible selectivity.