High-Precision Remote Ranging With Step-Frequency-Signal Magnetic Resonance

An efficient method for high-precision remote ranging with step-frequency-signal magnetic resonance is proposed. A step-frequency signal is employed as the driving signal to track the optimal resonant frequency that will maximize the transmission power of two resonant coils. In this way, high-precision remote ranging can be achieved because the signal-to-noise ratio of the receiving coil is always maintained at the highest level. Compared to the method excited by a single frequency in the traditional, nonresonant, coupled method, the ranging accuracy is increased by a factor of four in the same ranging scope, or the ranging scope is increased by an order of magnitude with the same ranging accuracy.