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The high-precision positioning technology of ultrashort wave radiation source targets under the condition of over the horizon wireless transmission is a difficult problem that urgently needs to be solved in non-cooperative communication detection; To address this challenge, while considering the influence of earth curvature, an equivalent earth radius model is proposed to modify the tropospheric scattering channel of ultrashort wave signals. Based on this, a new positioning method group based on Time Difference of Arrival is constructed; By combining the Chan algorithm with the Newton iteration method, the nonlinear equation system was solved to obtain the spatial position of the radiation source target; Detailed derivation of coordinate conversion calculations in different coordinate systems, algorithms for solving TDOA equations, and objective evaluation parameters for positioning performance - Geometric Dilution of Precision; The impact of time difference measurement accuracy on positioning accuracy was analyzed through simulation, and the proposed equivalent Earth radius model was validated through simulation. The results showed that the model can effectively reduce the over-the-horizon positioning error, and with the increase of distance, the improvement of positioning performance is more obvious, achieving high-precision positioning of ultra-short wave over-the-horizon radiation source targets, which has high engineering application value.