Ultrashort Wave Over the Horizon Time Difference Positioning Method Based on Equivalent Earth Radius
It is a difficult problem for the high-precision positioning technology of ultrashort wave radiation source targets under the condition of over the horizon wireless transmission,which urgently needs to be solved in non-cooperative communication detec-tion;To address this challenge,while considering the influence of the 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 equation group based on time difference of arrival is constructed;By combining the Chan algorithm with the Newton iteration method,the nonlinear equation sys-tem is solved to obtain the spatial position of the radiation source target;The coordinate conversion calculations in different coordinate systems and the algorithms for solving TDOA equations and objective evaluation parameters for positioning performance-geometric di-lution of precision are derived in detail;The impact of the time difference measurement accuracy on the positioning accuracy is ana-lyzed through the simulation,and the proposed equivalent earth radius model is validated through the simulation.The results show that the model can effectively reduce the over-the-horizon positioning error,and with the increase of distance,the positioning perform-ance has more obvious improvement,achieving the high-precision positioning of ultra-short wave over-the-horizon radiation source tar-gets,which has a high engineering application value.
ultrashort wavetroposcatterover the horizontime difference of arrivalequivalent earth radius
万方数据
维普
