Magnetic Localization and Parameter Estimation Method Based on Frequency Domain

At the present time magnetic compensation is not very accurate, an accurate solution of target parameters requires high robustness of the estimation algorithm. Traditional optimization method, when applied to magnetic positioning problem, is multidimensional, strongly nonlinear and not easy to converge. To surmount this, spectrum matching method is put forward. Spectrum matching method tries to convert the simultaneous searching of multidimensional optimal solution into sequential searching of optimal solution of lower dimensions. Two important parameters, time delay and the scale factor are roughly estimated from the energy of the signal. Then the algorithms generate functions of different time delays and scale factors for parameter matching and optimal solution of time delay and the scale factor are obtained by using a certain criterion. Simulation results agree with the theoretical analysis and the algorithm achieves its goal.